JP2010122703A - Liquid crystal display and method of controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display in which the brightness and the contrast of a display screen become constant irrespective of a temperature change of a liquid crystal panel, and to provide a method of controlling the liquid crystal display. <P>SOLUTION: The liquid crystal display includes: a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are laid out vertically and horizontally, and pixel electrodes are arranged at intersections of the respective signal lines and the respective scanning lines via switching elements; and a control circuit for performing γ-correction in accordance with a temperature change of the liquid crystal panel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an active matrix liquid crystal display device and a control method therefor, and more particularly, to a technique for satisfactorily displaying an image.

  A TFT (Thin Film Transistor) drive liquid crystal display device using a thin film transistor as a drive element is widely used as a display device for a personal computer or the like as an active matrix liquid crystal display device. In general, this type of liquid crystal display device often adopts a liquid crystal display system called a twisted nematic (TN) type. The TN liquid crystal display device is formed by sandwiching a twist array cell in which the alignment of liquid crystal molecules is continuously twisted by 90 degrees between two transparent electrode substrates. This device transmits light when no voltage is applied between the electrode substrates.

  FIG. 78 shows an outline of the above-described TFT drive liquid crystal display device.

  This device includes TFTs and pixel electrodes 1 arranged in a matrix. The gate electrode of the TFT as a switching element is connected to scanning lines G1, G2,..., Gn that transmit a gate signal output from the Y driver 2. The drain electrode of the TFT is connected to signal lines D1, D2,..., Dm that transmit data signals output from the X driver 3. The source electrode of the TFT is connected to the pixel electrode 1. A counter electrode (not shown) is disposed to face the pixel electrode 1. A liquid crystal (not shown) is sandwiched between the pixel electrode 1 and the counter electrode to form a liquid crystal cell C.

  Data is written to the liquid crystal cell C by turning on the TFT 1 with a pulsed gate signal sequentially supplied to the scanning lines G1, G2,..., Gn, and simultaneously on the signal lines D1, D2,. This is performed by transferring the supplied data signal to the pixel electrode 1 (line sequential driving). The information of the data signal written in the liquid crystal cell C is held until the pixel electrode 1 is driven again after one frame. As described above, the control for holding the information in the liquid crystal cell C until the next data signal is written is generally referred to as hold driving.

  FIG. 79 shows the waveform of the driving voltage and the response waveform of the liquid crystal cell C when the TFT driving liquid crystal display device described above is hold-driven. The waveform of the pixel response corresponds to the amount of light transmitted through the liquid crystal cell C. Here, a state in which data is written in one liquid crystal cell C of interest is shown.

  The Y driver 2 shown in FIG. 78 drives a predetermined scanning line every 16 ms to generate an H pulse in the gate signal. The X driver 3 generates a data signal in synchronization with the gate signal. The polarity of the data signal is inverted every frame scan, and so-called frame inversion driving is performed. Note that all the scanning lines not displaying the waveform are scanned within the period of 16 ms shown in the figure.

  For example, during the first three frames, the absolute value of the voltage applied between the pixel electrode 2 and the counter electrode (not shown) is 5V. For this reason, the liquid crystal cell C of interest passes light and displays white. During the remaining three frames, the voltage applied between the pixel electrode 2 and the counter electrode (not shown) is 0V. For this reason, the liquid crystal cell C of interest focuses light and displays black.

  In general, the response time of the liquid crystal cell C in the TN liquid crystal display device is longer than the scanning period of one frame. In particular, the response time of the liquid crystal cell C in halftone continues for several frames as shown by the broken line in FIG. Recently, for example, a liquid crystal cell called a π cell with a short response time has been developed.

  As described above, a TN liquid crystal display device conventionally displays an image by hold driving. In the hold drive, the information in the liquid crystal cell C is held until the next data signal is written, and blur (image tailing) in which a part of the data of the previous frame appears to overlap in the moving image occurs. Such blur does not occur in a CRT (Cathode Ray Tube).

  FIG. 80 shows a waveform of a CRT drive voltage generally called impulse drive. The pixel emits light only when a voltage is applied to the drive signal and the pixel is irradiated with an electron beam. Since the data scanned one frame before disappears with the L level transition of the drive signal, no blur occurs.

  In order to reduce the above-described blur in the liquid crystal display device, an attempt to perform impulse driving is also made in the liquid crystal display device. Details of this attempt are described in Non-Patent Document 1. This type of liquid crystal display device uses a π cell having a short response time.

  FIG. 81 shows a driving voltage waveform and a response waveform of the liquid crystal cell when impulse driving is performed in the liquid crystal display device. As in FIG. 79, the first three frames display white and the remaining three frames display black.

  The liquid crystal display device drives a predetermined scanning line twice every 16 ms (one frame). The first scan is used for capturing a data signal, and the second scan is used for resetting the liquid crystal cell. That is, after a data signal is written in the liquid crystal cell C, impulse data is written by writing black data after a predetermined time. In the figure, “W” indicates a white write operation, “B” indicates a black write operation, and “R” indicates a reset operation. By doing so, the display data of the liquid crystal cell C is held for a certain period T1 within one frame, and the blurring of the moving image is reduced.

  FIG. 82 shows a display example of the screen when the impulse driving described above is performed. In the figure, white liquid crystal cells display white, and shaded liquid crystal cells indicate black.

  As shown in the waveform in the figure, display data (white) is written by the first scanning in the display period of one frame (16 ms). Reset data (black) is written by the second scan in the display period of one frame (16 ms). That is, as shown in the upper side of the drawing, the display data and the reset data move in a band shape from the top to the bottom by scanning one frame.

Japanese Patent Laid-Open No. 10-62811

Digest of SID98 pp.143-146

  However, alternately writing the display data (white) and the reset data (black) line-sequentially causes flicker. In particular, the flicker increases when the display speed of the liquid crystal cell C is slow or when the scanning cycle (refresh rate) is long.

  A liquid crystal display device provided with a plurality of X drivers and Y drivers and independently driving adjacent liquid crystal cells is disclosed in Patent Document 1. In this liquid crystal display device, the writing operation and the resetting operation to a plurality of liquid crystal cells are performed in an overlapping manner, so that the writing time and reset time for each liquid crystal cell are secured and the contrast of display data is improved. However, this type of liquid crystal display device has a problem that the circuit scale increases because a plurality of X drivers and Y drivers are provided. Further, since the number of signal lines is twice as much, there is a problem that the aperture ratio is lowered.

  In general, in order to increase the luminance of a display image, a backlight is disposed to face a liquid crystal panel including a pixel electrode, a TFT, and a control circuit thereof. However, when the impulse driving described above is performed, reset data is written, and the pixel electrode displaying black absorbs light emitted from the backlight. As a result, there is a problem that wasteful power is consumed. In addition, since an image displayed by impulse driving has a lower luminance than an image displayed by hold driving, it is necessary to increase the luminance of the backlight. As a result, there is a problem that power consumption increases.

  When a plurality of fluorescent tubes arranged in parallel as a backlight are used, there is a problem that the difference in the deterioration rate of each fluorescent tube can be seen as an image display unevenness as it is.

  An object of the present invention is to provide a liquid crystal display device capable of improving the quality of a moving image and a control method thereof. In particular, the object is to reduce image blur, to prevent flicker, and to prevent ghosts. Further, the present invention provides a liquid crystal display device in which the brightness and contrast of the display screen are constant regardless of the temperature change of the liquid crystal panel, and a control method therefor.

  Another object of the present invention is to blink the backlight efficiently and reduce power consumption.

  Another object of the present invention is to provide a backlight that does not cause uneven display of images.

Each structure used for description of the present invention is listed below. The invention described in claims corresponds to configurations 4 to 23 and configurations 28 to 34.
(Configuration 1)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. LCD panel,
A control circuit that controls the liquid crystal panel via the signal lines and the scanning lines, and activates the control signal transmitted to the scanning lines twice in one frame period for displaying one screen; ,
The liquid crystal panel is divided into a first pixel region and a second pixel region adjacent to the first pixel region,
When one of the control signals is activated, the display data is written to the first pixel area, and the reset data is written to the second pixel area.
A liquid crystal display device, wherein when the other of the control signals is activated, reset data is written in the first pixel region and the display data is written in the second pixel region.
(Configuration 2)
In the liquid crystal display device according to Configuration 1,
On the back surface of the liquid crystal panel, a backlight is provided to face the first pixel region and the second pixel region,
Each of the backlights is turned on in synchronization with the writing of the display data to the first pixel region and the second pixel region, and the reset data is written to the first pixel region and the second pixel region. A liquid crystal display device which is turned off in synchronization.
(Configuration 3)
In the liquid crystal display device according to Configuration 2,
A light guide plate is provided on the back surface of the liquid crystal panel so as to face the first pixel region and the second pixel region, respectively, and a fluorescent tube is provided at one end of the light guide plate. Display device.
(Configuration 4)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. LCD panel,
A liquid crystal display device comprising: a control circuit that performs gamma correction in response to a temperature change of the liquid crystal panel.
(Configuration 5)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. LCD panel,
A plurality of first backlights disposed on the back surface of the liquid crystal panel and spaced apart from each other; and a plurality of second backlights adjacent to the first backlight and spaced apart from each other.
The liquid crystal display device, wherein the first backlight and the second backlight blink alternately.
(Configuration 6)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. LCD panel,
A light guide plate disposed facing the liquid crystal panel;
A backlight disposed at one end of the light guide plate and supplying light along the scanning direction of the scanning line into the light guide plate;
The liquid crystal display device, wherein the light guide plate includes a plurality of irradiation regions that condense and control the introduced light and irradiate the liquid crystal panel along the scanning direction of the scanning lines.
(Configuration 7)
In the liquid crystal display device according to Configuration 6,
A plurality of film-like scattering portions that totally or irregularly reflect light traveling in the light guide plate according to external control are arranged along the scanning direction of the scanning line in the light guide plate,
The liquid crystal display device, wherein the irradiation region is formed by irregular reflection of light by the scattering portion.
(Configuration 8)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. With a liquid crystal panel,
A liquid crystal display device characterized in that a light emission time which is a period for outputting a display image in a period of one frame to the outside of the liquid crystal panel is manually adjusted.
(Configuration 9)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. With a liquid crystal panel,
A light emission time which is a period for outputting a display image in a period of one frame to the outside of the liquid crystal panel is adjusted according to a speed of movement of an image displayed on the liquid crystal panel. .
(Configuration 10)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. With a liquid crystal panel,
A hold control function for outputting a display image to the outside of the liquid crystal panel during the entire period of one frame; and an impulse control function for outputting the display image to the outside of the liquid crystal panel during a predetermined period of one frame period; Have
A liquid crystal display device, wherein the hold control is performed when the display data is a still image, and the impulse control is performed when the display data is a moving image.
(Configuration 11)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and pixel electrodes are arranged through switching elements at intersections of the signal lines and the scanning lines. A liquid crystal panel composed of a plurality of control blocks divided into n (n ≧ 4) along the scanning direction of the scanning lines;
A plurality of backlights arranged to face each of the control blocks,
The liquid crystal panel scans each scanning line once in a period of one frame, performs a hold drive to write the display data to the pixel electrode,
The backlight corresponding to each control block is lit for a predetermined period immediately before scanning the scanning line in the control block,
The response time of each pixel of the liquid crystal panel is
1 frame time × (n−2) / n
A liquid crystal display device characterized by being smaller.
(Configuration 12)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and pixel electrodes are arranged through switching elements at intersections of the signal lines and the scanning lines. A liquid crystal panel composed of a plurality of control blocks divided into n (n ≧ 3) along the scanning direction of the scanning lines;
A plurality of backlights arranged to face each of the control blocks,
The liquid crystal panel scans each scanning line twice in a period of one frame, performs impulse driving to write the display data and reset data to the pixel electrode,
The backlight corresponding to each control block is lit for a predetermined period immediately before scanning the scanning line in the control block,
The response time of each pixel of the liquid crystal panel is
1 frame time × [[(n−1) / 2n] − (1 / n)] (n: odd number)
1 frame time × [[(n−2) / 2n] − (1 / n)] (n: even number)
A liquid crystal display device characterized by being smaller.
(Configuration 13)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. LCD panel,
A light guide plate disposed facing the liquid crystal panel;
A first polarization separation sheet sequentially disposed on one surface of the light guide plate, a liquid crystal shutter divided into a plurality along the scanning direction of the scanning line, a second polarization separation sheet, and a scattering sheet;
A liquid crystal display device comprising: a backlight disposed at one end of the light guide plate, and supplying light into the light guide plate along a scanning direction of the scanning lines.
(Configuration 14)
In the liquid crystal display device according to Configuration 13,
A liquid crystal display device comprising a retardation sheet disposed on the other surface of the light guide plate.
(Configuration 15)
In the liquid crystal display device according to Configuration 13,
The liquid crystal display device, wherein the scattering sheet is formed of a plurality of prisms.
(Configuration 16)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are vertically and horizontally wired, and a capacitance unit made of liquid crystal via a switching element at the intersection of each signal line and each scanning line Equipped with a liquid crystal panel,
The liquid crystal panel is provided with a resistor portion connected in parallel to each of the capacitor portions and having a resistance value lower than that of the capacitor portion.
(Configuration 17)
In the liquid crystal display device described in Structure 16,
The liquid crystal display device, wherein the resistance portion is formed by an auxiliary capacitance portion arranged in the liquid crystal panel.
(Configuration 18)
In the liquid crystal display device described in Structure 16,
A liquid crystal display device, wherein the liquid crystal mode of the liquid crystal panel is normally black.
(Configuration 19)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and includes a liquid crystal panel in which pixel electrodes are arranged at intersections of the signal lines and the scanning lines,
The pixel electrode is connected to a first thin film transistor and a second thin film transistor having different threshold voltages,
The liquid crystal, wherein the gate electrode of the first thin film transistor and the gate electrode of the second thin film transistor respectively connected to the pixel electrodes adjacent to each other in the scanning direction of the scanning line are connected to the same scanning line. Display device.
(Configuration 20)
In the liquid crystal display device described in Structure 19,
Each of the scanning lines is selected twice with different voltages in one frame period.
(Configuration 21)
In the liquid crystal display device described in Structure 19,
The first thin film transistor is connected to the signal line, and the second thin film transistor is connected to an electrode to which a voltage corresponding to reset data is supplied,
The liquid crystal display device, wherein a threshold voltage of the second thin film transistor is higher than a threshold voltage of the first thin film transistor.
(Configuration 22)
A liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and a liquid crystal cell is arranged at an intersection of each signal line and each scanning line;
A backlight mechanism having a plurality of light emitting units arranged facing the liquid crystal panel and partitioned in the scanning direction of the scanning lines,
Each of the light emitting units is turned on sequentially, the scanning line corresponding to the light emitting unit is scanned during the light extinguishing period of the light emitting unit, and impulse driving is started to start writing the display data to the liquid crystal cell,
The number of sections of the light emitting unit, the ratio of the lighting period in one frame period of the light emitting unit, and the response time of the liquid crystal cell are such that the change in luminance due to the transient response of the pixel electrode after the light emitting unit is turned on A liquid crystal display device characterized in that it is determined to be 5% or less of the luminance during the lighting period of the part.
(Configuration 23)
In the liquid crystal display device according to Configuration 22,
The backlight mechanism is configured by the light emitting unit whose region changes for each frame,
Each of the light emitting units includes one or a plurality of lighting mechanisms adjacent to each other.
(Configuration 24)
A liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and a liquid crystal cell is arranged at an intersection of each signal line and each scanning line;
A backlight mechanism disposed to face the liquid crystal panel,
While the backlight mechanism is blinking, the scanning lines are sequentially scanned to perform the impulse driving for writing the display data to the liquid crystal cell,
The display data written in the liquid crystal cell in a predetermined period before and after the backlight mechanism is turned off is prediction data generated when the backlight mechanism is turned on, which is generated by performing motion compensation. Liquid crystal display device.
(Configuration 25)
In the liquid crystal display device according to Configuration 24,
The liquid crystal display device according to claim 1, wherein the motion compensation is performed using display data of the frame and display data of another frame.
(Configuration 26)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. With a liquid crystal panel,
The liquid crystal panel is divided into a first pixel region and a second pixel region adjacent to the first pixel region,
Activating the control signal transmitted to each scanning line twice in a period of one frame for displaying one screen;
When one of the control signals is activated, the display data is written to the first pixel area, and the reset data is written to the second pixel area.
A control method for a liquid crystal display device, wherein when the other of the control signals is activated, the reset data is written in the first pixel region and the display data is written in the second pixel region.
(Configuration 27)
In the method for controlling a liquid crystal display device according to Configuration 26,
A backlight provided on the back surface of the liquid crystal panel so as to face the first pixel region and the second pixel region is synchronized with the writing of the display data to the first pixel region and the second pixel region. The method of controlling a liquid crystal display device comprising: turning on and turning off in synchronization with writing of the reset data to the first pixel region and the second pixel region.
(Configuration 28)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. A control method for a liquid crystal display device, comprising a liquid crystal panel, and performing gamma correction in response to a temperature change of the liquid crystal panel.
(Configuration 29)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. A liquid crystal panel, a plurality of first backlights disposed on the back surface of the liquid crystal panel and spaced apart from each other, and a plurality of second backlights adjacent to the first backlight and spaced apart from each other, A control method for a liquid crystal display device, wherein the first backlight and the second backlight are alternately blinked.
(Configuration 30)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. With a liquid crystal panel,
A method for controlling a liquid crystal display device, comprising: manually adjusting a light emission time during which a display image in a period of one frame is output to the outside of the liquid crystal panel.
(Configuration 31)
A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. With a liquid crystal panel,
A liquid crystal display device characterized by adjusting a light emission time which is a period for outputting a display image in a period of one frame to the outside of the liquid crystal panel according to a speed of movement of an image displayed on the liquid crystal panel. Control method.
(Configuration 32)
A data driver for outputting display data to a signal line during an activation period of a timing signal; a gate driver for sequentially outputting a gate pulse to a scanning line; and a switching element at an intersection of each signal line and each scanning line A liquid crystal display device comprising a liquid crystal panel having a pixel electrode disposed therebetween,
The method for controlling a liquid crystal display device, wherein the data driver outputs reset data during an inactivation period of the timing signal in one horizontal period.
(Configuration 33)
In the method for controlling a liquid crystal display device according to Configuration 32,
The gate pulse is sequentially output to the scanning line to write the display data to the pixel electrode, and after a predetermined time, the gate pulse is sequentially output again to the scanning line to reset the reset data to the pixel electrode. A method for controlling a liquid crystal display device, wherein writing is performed.
(Configuration 34)
In the method for controlling a liquid crystal display device according to Configuration 33,
During the non-scanning period, which is the period from the last scanning of the scanning line for writing the display data to the end of the frame, the scanning line is sequentially scanned to write the reset data, and the reset data is written to the same A control method for a liquid crystal display device, which is always performed after a predetermined time from writing of the display data in the scanning line.

  FIG. 1 is a block diagram showing the basic principle of the invention described in Configuration 1.

  In the liquid crystal display device of configuration 1, a plurality of signal lines D1-Dm for transmitting display data and a plurality of scanning lines G1-Gn for transmitting control signals are wired vertically and horizontally, and each signal line D1-Dm and each scanning line are arranged. A liquid crystal panel A in which a pixel electrode 5 is arranged via a switching element 4 at an intersection with G1-Gn, and a control circuit 6 for controlling the liquid crystal panel A via signal lines D1-Dm and scanning lines G1-Gn; It has. The liquid crystal panel A is partitioned into a first pixel region 7 and a second pixel region 8 adjacent to the first pixel region 7.

  The control circuit 6 performs impulse driving that activates a control signal transmitted to each scanning line twice during a period of one frame for displaying one screen. The control circuit 6 writes display data in the first pixel area 7 and writes reset data in the second pixel area 8 when one of the control signals is activated. Further, the control circuit 6 writes the reset data in the first pixel region 7 and the display data in the second pixel region 8 when the other of the control signals is activated. By writing the reset data to the pixel areas 7 and 8, the display data written immediately before is reset. In a plurality of consecutive frames, the display data written in the pixel areas 7 and 8 is always reset within a period of one frame. For this reason, the blur of the display image is reduced. Since writing and resetting of display data is performed in a distributed manner in the first pixel region 7 and the second pixel region 8, it is possible to prevent flicker from occurring on the display screen.

  FIG. 2 is a block diagram showing the basic principle of the invention described in Configuration 2.

  In the liquid crystal display device of Configuration 2, a backlight 9 is provided on the back surface of the liquid crystal panel A so as to face the first pixel region 7 and the second pixel region 8, respectively. Each backlight 7 is turned on in synchronization with writing of display data to the first pixel region 7 and the second pixel region 8. Each backlight 9 is turned off in synchronization with the writing of the reset data to the first pixel region 7 and the second pixel region 8. For this reason, it is possible to increase the contrast ratio between writing display data and writing reset data, and an easy-to-view screen is configured. Further, since the backlight 9 corresponding to the pixel areas 7 and 8 where display data is not written is turned off, power consumption is reduced.

  In the liquid crystal display device of configuration 3, light guide plates are provided on the back surface of the liquid crystal panel so as to face the first pixel region and the second pixel region, respectively. A fluorescent tube is provided at one end of each light guide plate. Light emitted from the fluorescent tube is guided to the first pixel region and the second pixel region by each light guide plate. This minimizes the number of fluorescent tubes.

  In the liquid crystal display device of configuration 4, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and a switching element is interposed at the intersection of each signal line and each scanning line. And a control circuit for performing gamma correction corresponding to the temperature change of the liquid crystal panel. For this reason, the brightness and contrast of the display screen are constant regardless of the temperature change of the liquid crystal panel.

In the liquid crystal display device of Configuration 5, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and the switching element 1 is provided at the intersection of each signal line and each scanning line. A liquid crystal panel having the pixel electrode 2 interposed therebetween, a plurality of first backlights disposed on the back surface of the liquid crystal panel and spaced from each other, and a plurality of second backlights adjacent to the first backlight and spaced from each other. It has a backlight.
Pseudo impulse driving is performed by alternately blinking the first backlight and the second backlight. Then, the blur of the image is reduced and the occurrence of flicker is prevented.

  In the liquid crystal display device of configuration 6, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and a switching element is interposed at an intersection of each signal line and each scanning line. A liquid crystal panel having pixel electrodes disposed thereon, a light guide plate disposed opposite to the liquid crystal panel, a backlight disposed at one end of the light guide plate and supplying light along the scanning direction of the scanning lines into the light guide plate; It has. The light guide plate includes a plurality of irradiation areas along the scanning direction of the scanning lines. A part of the plurality of irradiation regions collects light introduced into the light guide plate and irradiates the light toward the liquid crystal panel. At this time, the remaining irradiation region does not collect light. For example, when display data is displayed on the liquid crystal panel, impulse driving can be easily performed by sequentially switching the irradiation region to be collected and controlled in accordance with the control of the liquid crystal panel. For this reason, blurring of moving images is reduced, and flickering is prevented. Furthermore, since the light introduced into the light guide plate can be used efficiently, power consumption is reduced. Since no fluorescent tube is used, display unevenness due to deterioration of the fluorescent tube does not occur.

  In the liquid crystal display device of configuration 7, a plurality of film-like scattering portions that totally or irregularly reflect light traveling in the light guide plate according to external control are arranged along the scanning direction of the scanning lines on the light guide plate. ing. The irradiation area of the light guide plate is formed by irregular reflection of light by these scattering portions. By controlling the scattering portion from the outside, the irradiation region can be easily formed at a desired position of the light guide plate.

  In the liquid crystal display device of Configuration 8, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and a switching element is interposed at an intersection of each signal line and each scanning line. A liquid crystal panel on which pixel electrodes are arranged. The light emission time, which is a period during which a display image in one frame period is output to the outside of the liquid crystal panel, is manually adjusted. For this reason, a person viewing the display image can directly adjust the display image so that the display image is most easily seen. For example, the light emission time is lengthened when viewing a still image and shortened when viewing a moving image. In this way, since adjustment can be made according to the feeling of the person viewing the display image, blurring of the moving image is reduced and flicker is prevented.

  In the liquid crystal display device of Configuration 9, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and a switching element is interposed at an intersection of each signal line and each scanning line. A liquid crystal panel on which pixel electrodes are arranged. The light emission time, which is a period for outputting the display image in the period of one frame to the outside of the liquid crystal panel, is adjusted according to the speed of movement of the image displayed on the liquid crystal panel. For this reason, for example, by shortening the light emission time in a moving image, blurring of the moving image is reduced and flicker is prevented.

  In the liquid crystal display device of configuration 10, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and a switching element is interposed at an intersection of each signal line and each scanning line. A liquid crystal panel on which pixel electrodes are arranged. Also, a hold control function for outputting a display image to the outside of the liquid crystal panel during one frame period and an impulse control function for outputting the display image to the outside of the liquid crystal panel during a predetermined period of one frame period. Have. Then, hold control is performed when the display data is a still image, and impulse control is performed when the display data is a moving image. For this reason, blurring is reduced in the moving image, and occurrence of flicker is prevented.

  The liquid crystal display device according to Configuration 11 includes a liquid crystal panel and a backlight. In a liquid crystal panel, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and pixel electrodes are arranged at intersections between the signal lines and the scanning lines via switching elements. It is composed of a plurality of control blocks which are arranged and divided into n pieces along the scanning direction of the scanning lines. The backlight is disposed to face each control block. The liquid crystal panel scans each scanning line once in a period of one frame and performs hold driving for writing display data to the pixel electrode. The backlight corresponding to each control block is turned on for a predetermined period immediately before scanning the corresponding control block. The response time of each pixel of the liquid crystal panel is shorter than “1 frame time × (n−2) / n”. For this reason, the response of each pixel is surely completed before the backlight is turned on. As a result, blurring of the moving image is reduced.

The liquid crystal display device of configuration 12 includes a liquid crystal panel and a backlight.
In the liquid crystal panel, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are vertically and horizontally wired, and pixel electrodes are arranged at intersections between the signal lines and the scanning lines via switching elements. A plurality of control blocks are arranged and divided into n pieces along the scanning direction of the scanning lines. The backlight is disposed to face each control block. The liquid crystal panel scans each scanning line twice during one frame period, and performs impulse driving for writing the display data and reset data to the pixel electrode. The backlight corresponding to each control block is turned on for a predetermined period immediately before scanning the corresponding control block. The response time of each pixel of the liquid crystal panel is “1 frame time × [[(n−1) / 2n] − (1 / n)] (n: odd number)”, “1 frame time × [[(n−2 ) / 2n] − (1 / n)] (n: even number) ”. For this reason, the response of each pixel is surely completed before the backlight is turned on. As a result, blurring of the moving image is reduced.

  In the liquid crystal display device of Configuration 13, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and a switching element is interposed at an intersection of each signal line and each scanning line. A liquid crystal panel having pixel electrodes disposed thereon, a light guide plate disposed opposite to the liquid crystal panel, a first polarization separation sheet sequentially disposed on one surface of the light guide plate, and a plurality of lines along the scanning direction of the scanning lines A partitioned liquid crystal shutter, a second polarization separation sheet, and a scattering sheet, and a backlight that is disposed at one end of the light guide plate and supplies light along the scanning direction of the scanning line into the light guide plate.

  The extraordinary light component of the light (non-polarized light) traveling in the light guide plate is reflected by the first polarization separation sheet and travels again in the light guide plate. The ordinary light component of the non-polarized light passes through the first polarization separation sheet and reaches the liquid crystal shutter. Here, when the liquid crystal shutter is in the birefringence state, the light transmitted through the first polarization separation sheet is shifted in phase by 90 ° and reaches the second polarization separation sheet as an abnormal light component. The light is reflected by the second polarization separation sheet, and is again shifted in phase by 90 ° by the liquid crystal shutter, and returns to the original ordinary light component. Thereafter, the light is transmitted through the first polarization separation sheet and returned again into the light guide plate. On the other hand, when the liquid crystal shutter is not in the birefringence state (transmission state), the light passes through the liquid crystal shutter and the second polarization separation sheet with the ordinary light component, and is scattered by the scattering sheet. In the case of a scattering sheet that reflects light, the light irregularly reflected by the scattering sheet again passes through the second polarization separation sheet, the liquid crystal shutter, and the first polarization separation sheet, and returns into the light guide plate. At this time, since most components of the light exceed the critical angle, the light passes through the light guide plate and is irradiated toward the liquid crystal panel. That is, the condensed light is irradiated only from a predetermined area of the liquid crystal shutter controlled to be in a transmissive state.

  Impulse driving can be easily performed by sequentially setting a predetermined area of the liquid crystal shutter to a transmission state in accordance with the control of the liquid crystal panel. For this reason, blurring of moving images is reduced, and flickering is prevented. Furthermore, since the light introduced into the light guide plate can be used efficiently by collecting the light, power consumption is reduced. Since no fluorescent tube is used, display unevenness due to deterioration of the fluorescent tube does not occur.

  In the liquid crystal display device having the structure 14, the phase of light traveling in the light guide plate is shifted by the phase difference sheet. For this reason, the light that does not include the ordinary light component includes the ordinary light component by shifting the phase of the reflected light by the phase difference sheet. That is, it is possible to increase the ordinary light component transmitted through the polarization separation sheet. Since the utilization efficiency of light is improved, power consumption can be reduced.

  In the liquid crystal display device having the structure 15, light from the light guide plate is reflected by the prism and irradiated in a predetermined direction. For this reason, the irradiation intensity of light can be increased.

  In the liquid crystal display device of configuration 16, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and a switching element is interposed at the intersection of each signal line and each scanning line. A liquid crystal panel having a capacitor portion made of liquid crystal. The liquid crystal panel includes a resistor portion connected in parallel to each capacitor portion and having a resistance value lower than that of the capacitor portion. For this reason, the electric charge charged by writing display data is gradually discharged through the resistance portion. The display data is displayed only for a predetermined period according to the resistance value. That is, impulse driving can be performed only with the liquid crystal cell without using a special control circuit. As a result, blurring of moving images can be reduced and flicker can be prevented.

  In the liquid crystal display device having the structure 17, the resistance portion can be easily formed by using the auxiliary capacitance portion added to the general liquid crystal cell.

  In the liquid crystal display device having the structure 18, after the display data is written, the display data is reset to black by discharging the charge in the capacitor portion. Therefore, impulse driving can be easily performed without using a special control circuit.

  In the liquid crystal display device having the structure 19, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and pixel electrodes are arranged at intersections between the signal lines and the scanning lines. LCD panel. The pixel electrode is connected to a first thin film transistor and a second thin film transistor having different threshold voltages. Further, the gate electrode of the first thin film transistor and the gate electrode of the second thin film transistor respectively connected to the pixel electrodes adjacent to each other in the scanning direction of the scanning line are connected to the same scanning line. One thin film transistor is used for writing display data, and the other thin film transistor is used for writing reset data. Since the threshold voltages of the first and second thin film transistors are different from each other, for example, reset data is not written when display data is written. When the reset data is written, the display data is written to the adjacent pixel electrode. However, reset data is written immediately after that. For this reason, incorrect display data is not displayed. In this way, impulse driving for alternately writing display data and reset data can be performed. As a result, blurring of moving images can be reduced and flicker can be prevented.

  In the liquid crystal display device of configuration 20, each scanning line is selected twice with different voltages in one frame period. First, a scanning line is selected with a predetermined voltage. One thin film transistor is turned on, and display data is written to a predetermined pixel electrode. At this time, the other thin film transistor is off. Next, the scanning line is selected with a high voltage. The other thin film transistor is turned on, and reset data is written to a predetermined pixel electrode. At this time, one thin film transistor connected to the pixel electrode adjacent to the predetermined pixel electrode is also turned on, and display data is written. However, in the scanning immediately after this, the other thin film transistor connected to the adjacent pixel electrode is turned on. For this reason, this display data is not displayed.

  In the liquid crystal display device having the structure 21, display data is written to the pixel electrode through the signal line and the first thin film transistor. The reset data is written to the pixel electrode through an electrode supplied with a voltage corresponding to the reset data and a second thin film transistor having a threshold voltage higher than that of the first thin film transistor.

  In the liquid crystal display device of configuration 22, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and a liquid crystal cell is arranged at the intersection of each signal line and each scanning line. And a backlight mechanism that is disposed to face the liquid crystal panel and is partitioned into a plurality of light emitting units in the scanning direction of the scanning lines. The liquid crystal display device sequentially turns on each light emitting unit, scans a scanning line corresponding to the light emitting unit during the light emitting unit extinction period, and performs impulse driving to start writing display data into the liquid crystal cell. Here, the number of sections of the light emitting unit, the ratio of the lighting period (duty ratio) in the period of one frame of the light emitting unit, and the response time of the liquid crystal cell, It is determined to be 5% or less of the luminance during the lighting period of the light emitting unit. In general, when the change in luminance exceeds 5%, not only the blur of the image but also a ghost in which the image looks double is generated. By setting the change in luminance to 5% or less, it is possible to prevent image blurring and to prevent ghosting. It has been tried to improve the quality of moving images by adopting a liquid crystal cell having a quick response time. However, in order to prevent a ghost in the impulse driving, it is necessary to optimize three conditions of the response time of the liquid crystal cell, the number of sections of the light emitting section, and the duty ratio of the light emitting section. As the number of sections of the light emitting unit is larger, the ghost is reduced. As the duty ratio of the light emitting unit is smaller, the ghost is reduced.

  In the liquid crystal display device having the structure 23, the number of lighting mechanisms that are turned on simultaneously changes for each frame, and the region of the light emitting unit changes. For this reason, the boundary of the light emission part which lights for every flame | frame differs. By moving the boundary of the light emitting unit for each frame, the boundary portion can be made difficult to see.

  In the liquid crystal display device of Configuration 24, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and a liquid crystal cell is arranged at the intersection of each signal line and each scanning line. And a backlight mechanism arranged to face the liquid crystal panel. The liquid crystal display device performs impulse driving that sequentially scans scanning lines while blinking a backlight mechanism and writes display data to a liquid crystal cell. Here, the display data written in the liquid crystal cell in a predetermined period before and after the backlight mechanism is turned off is prediction data when the backlight mechanism generated by performing motion compensation is turned on. Therefore, display data corresponding to the timing at which the liquid crystal display device actually displays an image (when the backlight mechanism is lit) is generated. As a result, blurring and awkward movement of moving images are prevented. That is, the quality of the moving image is improved.

  In the liquid crystal display device having the structure 25, the motion compensation is performed with a simple method and high accuracy using the display data of the frame and the display data of other frames.

  In the control method of the liquid crystal display device of configuration 26, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and switching is performed at intersections between the signal lines and the scanning lines. A liquid crystal display device including a liquid crystal panel in which pixel electrodes are arranged vertically and horizontally through the element is controlled. The liquid crystal panel is divided into a first pixel region and a second pixel region adjacent to the first pixel region. Then, the control signal transmitted to each scanning line is activated twice during one frame period for displaying one screen, and impulse driving is performed. When one of the control signals is activated, display data is written in the first pixel area, and reset data for displaying black is written in the second pixel area. Further, when the other of the control signals is activated, the reset data is written in the first pixel area, and the display data is written in the second pixel area. By writing the reset data in the pixel area, the display data written immediately before is reset. In a plurality of continuous frames, display data written in the pixel area is always reset within a period of one frame. For this reason, the blur of the display image is reduced. Since writing and resetting of display data is performed in a distributed manner in the first pixel region and the second pixel region, occurrence of flicker on the display screen is prevented.

  In the control method of the liquid crystal display device according to configuration 27, each backlight is lit in synchronization with writing of display data to the first pixel region and the second pixel region. Each backlight is turned off in synchronization with the writing of reset data to the first pixel region and the second pixel region. For this reason, it is possible to increase the contrast ratio between writing display data and writing reset data, and an easy-to-view screen is configured.

  In the control method of the liquid crystal display device of configuration 28, the liquid crystal display device has a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals arranged vertically and horizontally, and each signal line, each scanning line, A liquid crystal panel in which pixel electrodes are arranged via switching elements is provided at the intersections. The liquid crystal display device performs gamma correction corresponding to the temperature change of the liquid crystal panel. For this reason, the brightness and contrast of the display screen are constant regardless of the temperature change of the liquid crystal panel.

  In the control method of the liquid crystal display device of configuration 29, a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and switching is performed at intersections between the signal lines and the scanning lines. A liquid crystal panel having pixel electrodes arranged therebetween, a plurality of first backlights disposed on the back surface of the liquid crystal panel and spaced from each other, and a plurality of first backlights adjacent to the first backlight and spaced from each other. A liquid crystal display device having two backlights is controlled. That is, pseudo impulse driving is performed by alternately blinking the first backlight and the second backlight. Then, blurring of the image is reduced and occurrence of flicker is prevented.

  In the control method of the liquid crystal display device according to the configuration 30, the light emission time which is a period for outputting the display image in the period of one frame to the outside of the liquid crystal panel is manually adjusted. For this reason, a person viewing the display image can directly adjust the display image so that the display image is most easily seen. For example, the light emission time is lengthened when viewing a still image and shortened when viewing a moving image. In this way, since adjustment can be made according to the feeling of the person viewing the display image, blurring of the moving image is reduced and flicker is prevented.

  In the control method of the liquid crystal display device of configuration 31, the light emission time, which is a period for outputting the display image in the period of one frame to the outside of the liquid crystal panel, is adjusted according to the speed of movement of the image displayed on the liquid crystal panel. The For this reason, for example, by shortening the light emission time in a moving image, blurring of the moving image is reduced and flicker is prevented.

  In the control method of the liquid crystal display device according to configurations 32 and 33, the data driver outputs display data to the signal line during the activation period of the timing signal. The gate driver sequentially outputs gate pulses to the scanning lines. The switching element is controlled by a gate pulse, and display data or reset data is written to the pixel electrode arranged at the intersection of the signal line and the scanning line. The data driver outputs display data during the activation period of the timing signal in one horizontal cycle, and outputs reset data during the inactivation period. Impulse driving can be performed by controlling the gate driver in accordance with the output timing of display data and reset data, and writing display data and reset data in a period of one frame. As a result, blurring of moving images can be reduced and flicker can be prevented.

  In the control method of the liquid crystal display device according to Configuration 34, the reset data is written even in the non-scanning period. For this reason, the reset data is always written after a certain time from the writing of the display data. As a result, in any pixel electrode, the display data display period is equal, and the reset data display period is equal. Therefore, the brightness of display data on the liquid crystal panel can be made uniform, and the occurrence of uneven brightness can be prevented.

  In the liquid crystal display device having configuration 1, it is possible to reduce blurring of a display image and to prevent occurrence of flicker on the display screen.

  In the liquid crystal display device having configuration 2, the contrast ratio can be increased between writing display data and writing reset data, and an easy-to-view screen can be configured. In addition, power consumption can be reduced.

  In the liquid crystal display device of Configuration 3, the number of fluorescent tubes can be minimized by providing the light guide plate.

  Since the liquid crystal display device of configuration 4 includes a control circuit that performs gamma correction in response to the temperature change of the liquid crystal panel, the brightness and contrast of the display screen are made constant regardless of the temperature change of the liquid crystal panel. Can do.

  In the liquid crystal display device having the configuration 5, the first backlight and the second backlight are alternately blinked and pseudo impulse driving is performed, whereby blurring of an image can be reduced and occurrence of flicker can be prevented. it can.

  In the liquid crystal display device of configuration 6, when display data is displayed on the liquid crystal panel, the impulse drive can be easily performed by sequentially switching the irradiation region to be collected and controlled in accordance with the control of the liquid crystal panel. For this reason, blurring of moving images can be reduced and flicker can be prevented. Furthermore, since the light introduced into the light guide plate can be used efficiently, power consumption can be reduced. Since no fluorescent tube is used, display unevenness due to deterioration of the fluorescent tube does not occur.

  In the liquid crystal display device of configuration 7, the irradiation region can be easily formed at a desired position of the light guide plate by controlling the scattering portion from the outside.

  In the liquid crystal display device according to Configuration 8, a person viewing the display image can directly adjust the display image so that the display image is most easily seen. Since the display image can be adjusted according to the sensation of the person viewing the display image, blurring of the moving image can be reduced and flicker can be prevented.

  In the liquid crystal display device of configuration 9, by shortening the light emission time in the moving image, blurring of the moving image is reduced, and the occurrence of flicker is prevented.

  In the liquid crystal display device with configuration 10, hold control is performed when display data is a still image, and impulse control is performed when the display data is a moving image, whereby blur in the moving image can be reduced and flicker can be prevented.

  In the liquid crystal display device of Configuration 11, the response time of each pixel of the liquid crystal panel is set to be shorter than “1 frame time × (n−2) / n”. For this reason, each pixel can reliably complete the response before the backlight is turned on. As a result, blurring of moving images can be reduced.

  In the liquid crystal display device of configuration 12, the response time of each pixel of the liquid crystal panel is “1 frame time × [[(n−1) / 2n] − (1 / n)] (n: odd number)”, “1 frame. Time x [[(n−2) / 2n] − (1 / n)] (n: even number) ”. For this reason, each pixel can reliably complete the response before the backlight is turned on. As a result, blurring of moving images can be reduced.

In the liquid crystal display device according to the thirteenth aspect, the predetermined region of the liquid crystal shutter can be easily driven in impulse by sequentially setting the predetermined region of the liquid crystal shutter in accordance with the control of the liquid crystal panel.
For this reason, blurring of moving images can be reduced and flicker can be prevented. Furthermore, since the light introduced into the light guide plate can be used efficiently by collecting the light, power consumption can be reduced. Since no fluorescent tube is used, display unevenness due to deterioration of the fluorescent tube does not occur.

  In the liquid crystal display device having the structure 14, the ordinary light component transmitted through the polarization separation sheet can be increased. Since the utilization efficiency of light is improved, power consumption can be reduced.

  In the liquid crystal display device having the structure 15, the light irradiation intensity can be increased.

  In the liquid crystal display device having the configuration 16, impulse driving can be performed only with the liquid crystal cell without using a special control circuit. As a result, blurring of moving images can be reduced and flicker can be prevented.

  In the liquid crystal display device having the structure 17, the resistance portion can be easily formed by using the auxiliary capacitance portion added to the general liquid crystal cell.

  In the liquid crystal display device of configuration 18, impulse driving can be easily performed without using a special control circuit.

  In the liquid crystal display devices having the configuration 19 to the configuration 21, the first thin film transistor and the second thin film transistor having different threshold voltages can be used to perform impulse driving in which display data and reset data are written alternately. As a result, blurring of moving images can be reduced and flicker can be prevented.

  In the liquid crystal display device having the structure 22, the number of sections of the light emitting unit, the ratio of the lighting period (duty ratio) in the period of one frame of the light emitting unit, and the response time of the liquid crystal cell are It is determined that the change in luminance due to is less than 5% of the luminance during the lighting period of the light emitting unit. As a result, blurring of the image can be prevented and ghosting can be prevented.

  In the liquid crystal display device having the structure 23, the boundary portion of the light emitting unit is moved for each frame, so that the boundary portion can be hardly seen.

  In the liquid crystal display devices according to configurations 24 and 25, display data corresponding to the timing at which the liquid crystal display device actually displays an image (when the backlight mechanism is turned on) can be generated. As a result, blurring and awkward movement of moving images can be prevented. That is, the quality of the moving image is improved.

  According to the control method of the liquid crystal display device of configuration 26, it is possible to reduce the blur of the display image and to prevent occurrence of flicker on the display screen.

  With the control method of the liquid crystal display device according to configuration 27, the contrast ratio can be increased between display data writing and reset data writing, and an easy-to-view screen can be configured.

  In the control method of the liquid crystal display device of configuration 28, the brightness and contrast of the display screen can be made constant regardless of the temperature change of the liquid crystal panel.

  According to the control method of the liquid crystal display device of configuration 29, it is possible to reduce image blur and to prevent occurrence of flicker.

  In the control method of the liquid crystal display device having the configuration 30, a person viewing the display image can directly adjust the display image so that the display image can be seen most easily. Since the display image can be adjusted according to the sensation of the person viewing the display image, blurring of the moving image can be reduced and flicker can be prevented.

  In the control method of the liquid crystal display device of configuration 31, by reducing the light emission time in the moving image, blurring of the moving image can be reduced and occurrence of flicker can be prevented.

In the control method of the liquid crystal display device according to the configuration 32 and the configuration 33, the data driver outputs display data during the activation period of the timing signal in one horizontal cycle, and outputs reset data during the inactivation period. By controlling the gate driver in accordance with the output timing of these display data and reset data, and writing the display data and reset data in one frame period, impulse driving can be performed.
As a result, blurring of moving images can be reduced and flicker can be prevented.

  In the control method of the liquid crystal display device according to Configuration 34, the display period of display data can be made equal and the display period of reset data can be made equal in any pixel electrode. Therefore, the brightness of display data on the liquid crystal panel can be made uniform.

2 is a block diagram illustrating a basic principle of the invention described in Configuration 1. FIG. It is a block diagram which shows the basic principle of the invention described in Configuration 2. 1 is a block diagram illustrating a liquid crystal display device and a control method thereof according to a first embodiment of the present invention. It is explanatory drawing which shows the state which writes display data in the liquid crystal display device of FIG. It is a block diagram which shows 2nd Embodiment of the liquid crystal display device of this invention, and its control method. It is explanatory drawing which shows the state which writes display data in the liquid crystal display device of FIG. It is explanatory drawing which shows 3rd Embodiment of the liquid crystal display device of this invention, and its control method. It is explanatory drawing which shows the state which writes display data in the liquid crystal display device of FIG. It is explanatory drawing which shows the state which a fluorescent tube blinks in the liquid crystal display device of FIG. It is explanatory drawing which shows 4th Embodiment of the liquid crystal display device of this invention, and its control method. It is explanatory drawing which shows the state which writes display data in the liquid crystal display device of FIG. It is explanatory drawing which shows the state which a light emitting diode blinks in the liquid crystal display device of FIG. It is a block diagram which shows 5th Embodiment of the liquid crystal display device of this invention, and its control method. It is explanatory drawing which shows the state which a fluorescent tube blinks in the liquid crystal display device of FIG. It is a block diagram which shows 6th Embodiment of the liquid crystal display device of this invention, and its control method. It is explanatory drawing which shows 7th Embodiment of the liquid crystal display device of this invention, and its control method. FIG. 17 is a timing chart showing a state in which display data is written in the liquid crystal display device of FIG. 16. It is explanatory drawing which shows 8th Embodiment of the liquid crystal display device of this invention, and its control method. FIG. 19 is a timing chart showing a state in which display data is written to the liquid crystal display device of FIG. 18. It is a block diagram which shows 9th Embodiment of the liquid crystal display device of this invention. FIG. 21 is a timing chart showing a state in which display data is written in the liquid crystal display device of FIG. 20. It is a block diagram which shows 10th Embodiment of the liquid crystal display device of this invention. FIG. 23 is a timing chart showing a state in which display data is written to the liquid crystal display device of FIG. 22. It is a block diagram which shows 9th Embodiment of the control method of the liquid crystal display device of this invention. It is a block diagram which shows 10th Embodiment of the control method of the liquid crystal display device of this invention. It is a block diagram which shows 11th Embodiment of the control method of the liquid crystal display device of this invention. It is a block diagram which shows 11th Embodiment of the liquid crystal display device of this invention. It is explanatory drawing which shows the detail of the backlight of FIG. It is explanatory drawing which shows control of a liquid crystal panel and a backlight. It is explanatory drawing which shows the detail of the backlight in 12th Embodiment of the liquid crystal display device of this invention. It is explanatory drawing which shows control of a liquid crystal panel and a backlight. It is explanatory drawing which shows another example of a backlight. It is explanatory drawing which shows the detail of the backlight in 13th Embodiment of the liquid crystal display device of this invention. It is explanatory drawing which shows the detail of the liquid crystal film of FIG. It is explanatory drawing which shows the detail of a normal liquid crystal film. It is explanatory drawing which shows the detail of the backlight in 14th Embodiment of the liquid crystal display device of this invention. It is a block diagram which shows 15th Embodiment of the liquid crystal display device of this invention, and 12th Embodiment of the control method of a liquid crystal display device. It is a block diagram which shows 16th Embodiment of the liquid crystal display device of this invention, and 13th Embodiment of the control method of a liquid crystal display device. It is a block diagram which shows 17th Embodiment of the liquid crystal display device of this invention. It is explanatory drawing which shows 18th Embodiment of the liquid crystal display device of this invention. It is explanatory drawing which shows 19th Embodiment of the liquid crystal display device of this invention. It is explanatory drawing which shows the detail of FIG. It is explanatory drawing which shows 20th Embodiment of the liquid crystal display device of this invention. It is explanatory drawing which shows 21st Embodiment of the liquid crystal display device of this invention. It is explanatory drawing which shows 22nd Embodiment of the liquid crystal display device of this invention. It is explanatory drawing which shows 23rd Embodiment of the liquid crystal display device of this invention. It is explanatory drawing which shows 24th Embodiment of the liquid crystal display device of this invention. It is a block diagram which shows 25th Embodiment of the liquid crystal display device of this invention. It is sectional drawing which shows the detail of a liquid crystal cell. It is an equivalent circuit of a liquid crystal cell. It is explanatory drawing which shows the state which writes display data in a liquid crystal cell. It is explanatory drawing which shows the change of the applied voltage by CR time constant of an equivalent circuit. It is explanatory drawing which shows the change of the applied voltage by the CR time constant of an amorphous silicon. It is explanatory drawing which shows the change of the applied voltage by the film thickness and area of an amorphous silicon. It is explanatory drawing which shows the change of the applied voltage by the fluctuation | variation of the film thickness of an amorphous silicon. It is a block diagram which shows 26th Embodiment of the liquid crystal display device of this invention. It is sectional drawing which shows the detailed structure of TFT. It is explanatory drawing which shows operation | movement of a liquid crystal panel. It is a block diagram which shows 27th Embodiment of the liquid crystal display device of this invention. It is a block diagram which shows 14th Embodiment of the control method of the liquid crystal display device of this invention. It is a block diagram which shows the detail of a control circuit. It is a timing diagram which shows operation | movement of a control circuit. It is a timing diagram which shows operation | movement of a liquid crystal panel. It is explanatory drawing which shows the outline | summary of a display of a liquid crystal display device. It is a timing diagram which shows 15th Embodiment of the control method of the liquid crystal display device of this invention. It is a timing diagram which shows 16th Embodiment of the control method of the liquid crystal display device of this invention. It is a timing diagram which shows 17th Embodiment of the control method of the liquid crystal display device of this invention. It is a block diagram which shows 28th Embodiment of the liquid crystal display device of this invention. It is explanatory drawing which shows the basis which determines each condition of a liquid crystal display device. It is explanatory drawing which shows the reference | standard in the case of measuring the response time of a liquid crystal. It is explanatory drawing which shows the conditions for not generating the ghost of an image, and blurring. It is a block diagram which shows 29th Embodiment of the liquid crystal display device of this invention. It is explanatory drawing which shows the state in which a light emission part is formed. It is a block diagram which shows 30th Embodiment of the liquid crystal display device of this invention. It is a block diagram which shows the detail of an interpolation circuit. It is explanatory drawing which shows the outline | summary of operation | movement and motion compensation of a liquid crystal display device. It is a block diagram which shows an additional disclosed item (2). It is a block diagram which shows the outline | summary of the conventional liquid crystal display device. FIG. 79 is a timing chart showing a state in which display data is written to the liquid crystal display device of FIG. 78. It is a timing diagram which shows the waveform of the drive voltage of the conventional CRT. It is a timing diagram which shows the state which performs an impulse drive in the conventional liquid crystal display device. It is explanatory drawing which shows the example of a display of the screen at the time of performing the impulse drive of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First Embodiment of Liquid Crystal Display Device, First Embodiment of Control Method of Liquid Crystal Display Device)
This embodiment corresponds to configurations 1 and 26.

  FIG. 3 shows an outline of the TFT drive liquid crystal display device used in this embodiment.

  This liquid crystal display device includes TFTs and pixel electrodes 12 arranged in a matrix. The gate electrode of the TFT as a switching element is connected to the scanning lines G1, G2,. The scanning lines G1, G2,..., Gn are signal lines that transmit gate signals output from the Y driver 14. The drain electrode of the TFT is connected to signal lines D1, D2,..., Dm. The signal lines D1, D2,..., Dm are signal lines for transmitting data signals output from the X driver 16. The source electrode of the TFT is connected to the pixel electrode 12.

  A counter electrode (not shown) is disposed to face the pixel electrode 12. A liquid crystal (not shown) is sandwiched between the pixel electrode 12 and the counter electrode to form a liquid crystal cell C. And the liquid crystal panel A is comprised by the liquid crystal cell C arranged vertically and horizontally. In this embodiment, the liquid crystal cell C is composed of a π cell having a response time as short as about 2 ms, for example. As the liquid crystal panel A, it is possible to use other liquid crystal display modes such as a TN type LCD, a horizontal electric field drive type LCD, and the like.

  The Y driver 14 and the X driver 16 are controlled by a control circuit 18. The control circuit 18 receives display data from the outside. The Y driver 14, the X driver 16, and the control circuit 18 correspond to the control circuit 6 shown in FIG.

  The liquid crystal panel A is divided into a plurality of first pixel regions 20 spaced from each other, and second pixel regions 22 adjacent to the first pixel regions 20 and spaced from each other. The first pixel region 20 and the second pixel region 22 are formed in a strip shape along each scanning line.

FIG. 4 shows a state in which display data is written in the liquid crystal display device described above. The liquid crystal panel A has 6 pixels in the vertical direction and 8 pixels in the horizontal direction to simplify the description.
That is, the liquid crystal panel A is driven by six scanning lines G1-G6 and eight signal lines D1-D8.

  The scanning lines G1-G6 are activated twice during one frame period (16 ms) for displaying one screen, and transmit the gate signal of the H pulse to the liquid crystal panel A as shown in the waveform of the figure. Therefore, each liquid crystal cell C can display two data in one frame period. The Y driver 14 shown in FIG. 3 activates the scanning lines G1 to G6 in the order of arrangement while shifting the phase, and performs so-called line sequential scanning. For this reason, the control circuit such as the Y driver 14 is configured without drastically changing the conventional circuit. Here, of the period of one frame, the period in which the first activation of the scanning lines G1-G6 is referred to as a first field, and the period in which the second activation of the scanning lines G1-G6 is performed is the second. This is called a field.

  The control circuit 18 shown in FIG. 3 receives display data for two screens in one frame period. In the first field, the control circuit 18 writes data corresponding to the first pixel area 20 in the first received display data to the area 20 and writes black data to the second pixel area 22 as reset data. Here, the liquid crystal cell C in which display data is written is shown in white, and the liquid crystal cell C in which black data is written is shown by shading. As a result, as shown in the display screen (a) of FIG. 4, when the first field ends, display data is written every other line corresponding to each scanning line. For example, in the liquid crystal cell C indicated by a thick frame where the scanning line G1 and the signal line D1 intersect, as shown by the waveform in the figure, the amount of transmitted light increases in the first field, and white is displayed.

  As described above, the control circuit 18 discards the display data corresponding to the second pixel region 22 from the display data received first, and performs control to write black data instead. Conversion of display data to black data can be performed with a simple gate circuit. In this embodiment, it is not necessary to store part of the display data in a buffer memory or the like. For this reason, the circuit required for the conversion process in the control circuit 18 becomes a minimum scale. Further, the control at the time of conversion of black data can be easily performed.

  Next, in the second field, the control circuit 18 writes data corresponding to the second pixel area 22 in the display data received for the second time in this area 22, and black data as reset data in the first pixel area 20. Control writing. The control circuit 18 discards the display data corresponding to the first pixel area 20 among the display data received first, and writes black data instead. As a result, as shown in the display screen (b) of FIG. 4, the display of the first pixel area 20 in which the display data is written in the first field is reset by the black data.

  The control circuit 18 repeatedly resets (black) the display data written in the first pixel region 20 and the display data written in the second pixel region 22 by repeatedly performing the above-described writing operation. This prevents blurring such as tailing in the moving image.

  The display screen (c) in FIG. 4 shows a state when the scanning line G3 is activated in the first field. The display data is displayed on two or more adjacent lines only in two lines of the line controlled by the scanning line G3 and the adjacent line. In the other lines, display data and black data are alternately displayed.

  The display screen (d) in FIG. 4 shows a state when the scanning line G4 is activated in the first field. The black data is displayed on only two adjacent lines, that is, the line controlled by the scanning line G4 and the two adjacent lines. In the other lines, display data and black data are alternately displayed.

  As described above, the writing of display data and black data is performed in a distributed manner in the plurality of first pixel areas 20 and second pixel areas 22 instead of in a collective area of the liquid crystal panel 20, and thus flicker occurs on the display screen. Is prevented.

  As described above, in the liquid crystal display device and the method for controlling the liquid crystal display device according to the present invention, the liquid crystal panel A is partitioned into a plurality of first pixel regions 20 and second pixel regions 22 that are dispersed from each other. Display data and reset data were written alternately. For this reason, blurring of the display image can be reduced, and flicker can be prevented from occurring on the display screen.

  The control circuit 18 converted the display data to black data by discarding a part of the display data and writing black data instead. Therefore, the conversion process in the control circuit 18 can be performed by a simple gate circuit. Therefore, the circuit scale of the control circuit 18 can be minimized, and the conversion process can be easily controlled.

  Since each scanning line G1-G6 is line-sequentially scanned as in the conventional case, the control circuit such as the Y driver 14 can be configured without drastically changing the conventional circuit. That is, the scanning line can be easily controlled.

In this embodiment, the example in which the liquid crystal panel A is configured using π cells with a response time of about 2 ms has been described. The present invention is not limited to such an embodiment. For example, a liquid crystal cell with a response time of about 16 ms may be used. In this case, the same effect as in the first embodiment can be obtained by setting the period of one frame to 32 ms, for example. The liquid crystal cell is a vertical alignment (VA) type that includes an electric field that is horizontal to the liquid crystal panel and has a positive anisotropy of dielectric constant ε. It is conceivable to use an MVA (Multi-domain Vertical Alignment) type having a negative directionality, a horizontal alignment, an IPS (In Plane Switching) type of a horizontal electric field, or the like.
(Second Embodiment of Liquid Crystal Display Device, Second Embodiment of Control Method of Liquid Crystal Display Device)
This embodiment corresponds to configurations 1 and 26. The same elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  FIG. 5 shows an outline of a TFT drive liquid crystal display device used in this embodiment. In this embodiment, the first pixel region 20 and the second pixel region 22 are formed in a lattice shape for each liquid crystal cell C. The control circuit 24 includes a buffer memory 24a that holds a part of display data transmitted from the outside. Other configurations are the same as those of the first embodiment described above.

  FIG. 6 shows a state in which display data is written to the liquid crystal display device described above.

  In this embodiment, the control circuit 24 shown in FIG. 5 receives display data for one screen in one frame period (16 ms). In the first field, the control circuit 18 writes data corresponding to the first pixel area 20 in the captured display data to the area 20 and writes black data to the second pixel area 22 as reset data. That is, the control circuit 24 alternately outputs display data and black data as reset data to the X driver 16. Display data and black data are transmitted to every other signal line D1-Dm. The control circuit 18 temporarily holds data corresponding to the first pixel region 22 in which black data is written in the first field in the display data in the buffer memory 24a. The control of the scanning lines G1-Gn performed by the Y driver 14 is the same as that in the first embodiment.

  As a result, as shown in the display screen (a) of FIG. 6, when the first field is completed, the checkered pattern data is displayed on the liquid crystal panel A. For example, in the liquid crystal cell C indicated by a thick frame where the scanning line G1 and the signal line D1 intersect, as shown by the waveform, the amount of transmitted light increases in the first field and white is displayed.

  Next, the control circuit 24 reads the display data held in the buffer memory 24a in the second field, writes this data in the second pixel region 22, and writes black data in the first pixel region 20 as reset data. Take control. As a result, as shown in the display screen (b) of FIG. 6, the display of the first pixel area 20 in which the display data is written in the first field is reset by the black data.

  The control circuit 18 repeatedly resets (black) the display data written in the first pixel region 20 and the display data written in the second pixel region 22 by repeatedly performing the above-described writing operation. This prevents blurring of the image such as tailing in the moving image.

  The display screen (c) in FIG. 6 shows a state when the scanning line G3 is activated in the first field. The display data is displayed on the plurality of continuous liquid crystal cells C only in the liquid crystal cells C separated from each other in the line controlled by the scanning line G3 and the liquid crystal cells C in the adjacent lines. For this reason, display data is not displayed on a plurality of liquid crystal cells C continuous in the scanning line direction. In other liquid crystal cells C, display data and black data are alternately displayed.

  The display screen (d) in FIG. 6 shows a state when the scanning line G4 is activated in the first field. The black data is displayed on the plurality of continuous liquid crystal cells C only in the liquid crystal cells C separated from each other in the line controlled by the scanning line G4 and the liquid crystal cells C in the adjacent lines. For this reason, black data is not displayed on a plurality of liquid crystal cells C that are continuous in the scanning line direction. In the other lines, display data and black data are alternately displayed.

  Thus, the writing of the display data and the black data is performed by being alternately distributed in the plurality of first pixel areas 20 and second pixel areas 22 (that is, for each liquid crystal cell C), and thus flicker is displayed on the display screen. Occurrence is prevented.

Also in this embodiment, the same effect as that of the first embodiment described above can be obtained. Furthermore, in this embodiment, the first pixel region 20 and the second pixel region 22 are also partitioned in the scanning line direction. For this reason, it can prevent more reliably that a flicker generate | occur | produces on a display screen.
(3rd Embodiment of a liquid crystal display device, 3rd Embodiment of the control method of a liquid crystal display device)
FIG. 7 shows an outline of a TFT drive liquid crystal display device used in this embodiment. This embodiment corresponds to configurations 1, 2, and 27. The same elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  In this embodiment, the liquid crystal panel A has two strip-shaped first pixel regions 20 and two strip-shaped second pixel regions 22 alternately.

  The first pixel region 20 and the second pixel region 22 are partitioned corresponding to the liquid crystal cells C for two lines. The liquid crystal panel A has 8 vertical pixels and 8 horizontal pixels to simplify the description. Actually, the height and width of the liquid crystal cell C is about 0.3 mm, and the first pixel region 20 and the second pixel region 22 are liquid crystal of several lines to several tens of lines, or hundreds or thousands of lines, respectively. It is partitioned corresponding to the cell C.

  A light guide plate 26 made of a transparent resin such as polycarbonate is disposed at a position facing the first pixel region 20 and the second pixel region 22 on the back side of the liquid crystal panel A. The end surfaces where the light guide plates 26 are in contact with each other are subjected to fine uneven processing. Due to the unevenness, the light guided to the end face of the light guide plate 26 is irregularly reflected, and the joint of the light guide plate 26 becomes inconspicuous. At one end in the longitudinal direction of the light guide plate 26, fluorescent tubes F1-F4 are attached as backlights. Other configurations are the same as those in the first embodiment described above except that a control circuit (not shown) has a function of controlling the fluorescent tubes F1-F4.

  FIG. 8 shows a state in which display data is written to the liquid crystal display device described above.

  The scanning lines G1-G8 are activated twice in one frame period (16 ms) for displaying one screen, as shown in the waveform of the figure, and so-called line sequential scanning is performed. In the first field, data corresponding to the first pixel area 20 in the display data is written in the area 20, and black data is written in the second pixel area 22 as reset data. In the second field, data corresponding to the second pixel area 22 in the display data is written in this area 22, and black data is written in the first pixel area 20 as reset data.

In addition, control for blinking the fluorescent tubes F1-F4 is performed in accordance with the control of the scanning lines G1-G8.
For example, in the first field, the fluorescent tube F1 is turned on in synchronization with the activation of the scanning line G1. The fluorescent tube F3 is turned on in synchronization with the activation of the scanning line G5. Similarly, the fluorescent tubes F2 and F4 are turned off in synchronization with the activation of the scanning lines G4 and G8. In the second field, the fluorescent tubes F1, F3 are turned off in synchronization with the activation of the scanning lines G2, G6, and the fluorescent tubes F2, F4 are turned on in synchronization with the activation of the scanning lines G3, G7.

  The display screen (a) of FIG. 8 shows a state when the scanning line G8 is activated in the first field. The lit fluorescent tubes F1 and F3 are shown in white in the figure. Similarly, the display screen (b) of FIG. 8 shows a state when the scanning line G8 is activated in the second field. In other words, in this embodiment, the fluorescent tubes corresponding to the first pixel region 20 and the second pixel region 22 in which display data is written are turned on, and the fluorescence corresponding to the first pixel region 20 and the second pixel region 22 in which black data is written. Control to turn off the tube is performed. This control is performed by a control circuit (not shown). As a result, the luminance when black data is displayed decreases, and the contrast ratio between display data and black data increases. Therefore, an easy-to-see screen is configured. Further, since the fluorescent tubes corresponding to the first pixel region 20 and the second pixel region 22 that do not display display data are turned off, power consumption is reduced.

  FIGS. 9A and 9B show a state when the scanning line G3 is activated in the first field and a state when the scanning line G3 is activated in the second field.

  In FIG. 9A, the fluorescent tube F2 is not turned off when black data is written in the line corresponding to the scanning line G3. This is because the display data is displayed on the line corresponding to the scanning line G4 when the scanning line G3 is activated in the first field. The fluorescent tube F2 is turned off in synchronization with the activation of the scanning line G4, as shown in the waveform of FIG.

  On the other hand, in FIG. 9B, the fluorescent tube F2 is turned on in synchronization with the activation of the scanning line G3. This is because display data is displayed on a line corresponding to the scanning line G3 when the scanning line G3 is activated in the second field. The brightest display becomes possible by the timing of turning on and off.

  Also in this embodiment, the same effect as that of the first embodiment described above can be obtained. Furthermore, in this embodiment, since a backlight is attached to the back side of the liquid crystal panel A, the contrast ratio can be increased between writing display data and black data as reset data, and an easy-to-view screen can be obtained. Can be configured.

  Since the fluorescent tubes F1-F4 are used, a backlight can be easily configured according to the first pixel region and the second pixel region.

  Since the light guide plate 26 is provided in accordance with the sizes of the first pixel region and the second pixel region, the number of fluorescent tubes to be used can be minimized.

In this embodiment, an example in which the fluorescent tubes F1-F4 are turned on and then turned off has been described. The present invention is not limited to such an embodiment. For example, the fluorescent tubes F1-F4 may not be completely extinguished but may have a low luminance.
(4th Embodiment of a liquid crystal display device, 4th Embodiment of the control method of a liquid crystal display device)
FIG. 10 shows an outline of a TFT drive liquid crystal display device used in this embodiment. This embodiment corresponds to configurations 2 and 27. The same elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  In this embodiment, the liquid crystal panel A is partitioned in a grid pattern by four first pixel regions 20 and four second pixel regions 22 being adjacent to each other. The liquid crystal panel A has 8 vertical pixels and 8 horizontal pixels to simplify the description. Further, the light emitting diodes L1 to L8 are respectively arranged at positions facing the first pixel region 20 and the second pixel region 22 on the back side of the liquid crystal panel A. That is, the light emitting diodes L1-L8 are arranged corresponding to 2 vertical pixels and 4 horizontal pixels. Actually, the first pixel region 20 and the second pixel region 22 are partitioned corresponding to the liquid crystal cell C of several tens to several hundreds of pixels, respectively. Other configurations are the same as those in the first embodiment described above except that a control circuit (not shown) has a function of controlling the light emitting diodes L1-L8.

  Instead of the light emitting diodes L1-L8, a fluorescent tube and a light guide plate may be used as in the third embodiment described above.

  FIG. 11 shows a state in which display data is written in the liquid crystal display device described above.

  The scanning lines G1-G8 are activated twice during one frame period (16 ms) for displaying one screen, as shown by the waveform, and so-called line sequential scanning is performed. In the first field, data corresponding to the first pixel area 20 in the display data is written in the area 20, and black data is written in the second pixel area 22 as reset data. In the second field, data corresponding to the second pixel area 22 in the display data is written in this area 22, and black data is written in the first pixel area 20 as reset data.

  In addition, control for blinking the light emitting diode is performed in accordance with the control of the scanning lines G1-G8. For example, in the first field, the light emitting diode L1 is turned on in synchronization with the activation of the scanning line G1. The light emitting diodes L6, L3, and L8 are turned on in synchronization with the activation of the scanning lines G3, G5, and G7. Similarly, the light emitting diodes L5, L2, L7, and L4 are turned off in synchronization with the activation of the scanning lines G2, G4, G6, and G8. In the second field, the light emitting diodes L5, L2, L7, and L4 are turned on in synchronization with the activation of the scanning lines G1, G3, G5, and G7, and in synchronization with the activation of the scanning lines G2, G4, G6, and G8. The light emitting diodes L1, L6, L3, and L8 are turned off.

  The display screen (a) of FIG. 11 shows a state when the scanning line G8 is activated in the first field. The light-emitting diodes L1, L3, L6, and L8 that are lit are shown in white in the drawing. Similarly, the display screen (b) of FIG. 11 shows a state when the scanning line G8 is activated in the second field. That is, in this embodiment, control is performed to turn on the light emitting diodes corresponding to the first pixel region 20 and the second pixel region 22 in which display data is written. This control is performed by a control circuit (not shown).

  FIGS. 12A and 12B show a state when the scanning line G3 is activated in the first field and a state when the scanning line G3 is activated in the second field.

  In FIG. 12A, the light emitting diode L2 is not turned off when black data is written in the line corresponding to the scanning line G3. This is because the display data is displayed on the line corresponding to the scanning line G4 when the scanning line G3 is activated in the first field. The light emitting diode L2 is turned off in synchronization with the activation of the scanning line G4 as shown in the waveform of FIG. Conversely, the light emitting diode L2 is turned on when the scanning line G3 is activated. This is because the display data is displayed on a line corresponding to the scanning line G3.

  On the other hand, in FIG. 12B, the light emitting diode L2 is turned on in synchronization with the activation of the scanning line G3. This is because display data is displayed on a line corresponding to the scanning line G3 when the scanning line G3 is activated in the second field.

  Also in this embodiment, the same effect as the third embodiment described above can be obtained.

In this embodiment, the example in which the light emitting diodes L1-L8 are used as the backlight has been described. The present invention is not limited to such an embodiment. For example, the backlight may be configured using a PDP (Plasma Display Panel). In this case, a large number of first pixel regions 20 and second pixel regions 22 having a small area can be provided.
(5th Embodiment of a liquid crystal display device, 5th Embodiment of the control method of a liquid crystal display device)
FIG. 13 shows an outline of a TFT drive liquid crystal display device used in this embodiment. This embodiment corresponds to configurations 2 and 27. The same elements as those in the first and third embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

  In this embodiment, the liquid crystal panel A has two strip-shaped first pixel regions 20 and two strip-shaped second pixel regions 22 alternately. The first pixel region 20 and the second pixel region 22 are partitioned corresponding to the liquid crystal cells C for one line, respectively, for the sake of simplicity. Actually, the first pixel region 20 and the second pixel region 22 are partitioned corresponding to the liquid crystal cells C of several lines to several tens of lines, or hundreds or thousands of lines, respectively. In addition, the fluorescent tubes F1-F4 are arranged at positions facing the first pixel region 20 and the second pixel region 22 on the back side of the liquid crystal panel A, respectively. Actually, each of the fluorescent tubes F1-F4 is configured by arranging a plurality of fluorescent tubes in parallel in the scanning line direction. The control circuit 30 controls the Y driver 14, the X driver 16, and each fluorescent tube F1-F4. The control circuit 30 has a function of supplying an AC voltage having a predetermined frequency to each fluorescent tube F1-F4 with a phase shifted.

  FIG. 14 shows a state where the fluorescent tubes F1-F4 blink and a state where the scanning lines G1-G4 are driven in the liquid crystal display device described above.

The fluorescent tubes F1-F4 emit light with the same period, but their phases are shifted by a predetermined amount.
For this reason, the phase at which the luminance of the fluorescent tubes F1-F4 is maximized is different from the phase at which the luminance is minimized. The control circuit 30 shown in FIG. 13 adjusts the cycle of one frame to the light emission cycle of the fluorescent tubes F1-F4, and sets the scanning lines G1-G4 to the maximum and the minimum luminances of the fluorescent tubes F1-F4. Activate a little before. Specifically, the scanning line G1 is activated before the luminance of the fluorescent tube F1 is maximized in the first field, and is activated again before the luminance of the fluorescent tube F1 is minimized in the second field. . The scanning line G2 is activated before the luminance of the fluorescent tube F2 is minimized in the first field, and is activated again before the luminance of the fluorescent tube F2 is maximized in the second field. The scanning line G3 is activated before the luminance of the fluorescent tube F3 is maximized in the first field, and is activated again before the luminance of the fluorescent tube F3 is minimized in the second field. The scanning line G4 is activated before the luminance of the fluorescent tube F4 is minimized in the first field, and is activated again before the luminance of the fluorescent tube F4 is maximized in the second field.

  In the first field, display data is written in the first pixel region 20 shown in FIG. 13 by the activation of the scanning lines G1 and G3. Black data is written in the second pixel region 22 by the activation of the scanning lines G2 and G4. In the first field, black data is written in the first pixel region 20 by the activation of the scanning lines G1 and G3. Display data is written in the second pixel region 22 by the activation of the scanning lines G2 and G4.

  Therefore, the luminance of each fluorescent tube F1-F4 is maximized immediately after display data is written, and is minimized immediately after black data is written. As a result, an image with a high contrast ratio without flicker is displayed without specially controlling the turning on / off of the fluorescent tubes F1-F4.

Also in this embodiment, the same effect as that of the first embodiment described above can be obtained. Furthermore, in this embodiment, the control circuit 30 controls the scanning lines G1-G4 in accordance with the period of the alternating voltage supplied to the fluorescent tubes F1-F4, so that the fluorescent tubes F1-F4 are turned on / off. The contrast ratio of the screen can be increased without special control.
(6th Embodiment of a liquid crystal display device, 6th Embodiment of the control method of a liquid crystal display device)
FIG. 15 shows an outline of a TFT drive liquid crystal display device used in this embodiment. This embodiment corresponds to Configuration 1, Configuration 4, Configuration 26, and Configuration 28. The same elements as those in the first and third embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

  In this embodiment, the control circuit 32 includes a hold drive circuit 34, an impulse drive circuit 36, and a gamma correction table 38. Other configurations are the same as those of the fifth embodiment described above.

  The gamma correction table 38 has correction data at the time of hold driving, correction data at the time of impulse driving, and correction data corresponding to the temperature of the liquid crystal panel A.

  For example, the control circuit 32 activates the impulse drive circuit 36 when displaying a moving image, and activates the hold drive circuit 34 when displaying a still image. That is, in this embodiment, it is possible to control switching between hold driving and impulse driving according to the display screen. Here, the still image is not limited to a photograph. For example, when the liquid crystal display device of the present invention is connected to a personal computer, a screen such as spreadsheet software used on the computer is treated as a still image.

  In addition, the control circuit 32 performs control to increase the luminance of the fluorescent tubes F1 to F4 as compared with the hold drive when performing the impulse drive in which the display data is displayed at a low rate during one frame period. For this reason, variation in luminance is reduced between hold driving and impulse driving.

  The control circuit 32 performs optimum gamma correction at the time of hold driving and at the time of impulse driving.

  Further, the control circuit 32 receives the temperature of the liquid crystal panel A as a temperature detection signal, and reads correction data from the gamma correction table in accordance with this temperature. The control circuit 32 performs gamma correction of the display data in accordance with the correction data and adjusts the write voltage to each liquid crystal cell C.

  The temperature of the liquid crystal panel A may be detected by a temperature sensor, or may be detected by monitoring a current value flowing through an element such as a TFT.

  Also in this embodiment, the same effect as the first and third embodiments described above can be obtained. Furthermore, in this embodiment, since still images are displayed by hold driving and moving images are displayed by impulse driving, an optimal screen display can be performed for any image.

  Since the control for increasing the luminance of the fluorescent tubes F1-F4 is performed at the time of impulse driving, variation in luminance can be reduced between hold driving and impulse driving.

  Since the optimum gamma correction is performed for each of the hold drive and the impulse drive, the change in the amount of light transmitted through the liquid crystal cell C can be accelerated particularly during the impulse drive, and the luminance can be increased.

Since the gamma correction is performed in response to the temperature change of the liquid crystal panel A, the luminance, contrast, and gradation display characteristics of the display screen can be made constant regardless of the temperature change of the liquid crystal panel A.
(7th Embodiment of a liquid crystal display device, 7th Embodiment of the control method of a liquid crystal display device)
FIG. 16 shows an outline of the liquid crystal panel A in the TFT drive liquid crystal display device used in this embodiment. This embodiment corresponds to configurations 1 and 26.

  The liquid crystal panel A has four strip-shaped first pixel regions 20 and four strip-shaped second pixel regions 22 alternately. The first pixel region 20 and the second pixel region 22 are partitioned corresponding to the liquid crystal cells C for one line. The liquid crystal panel A has 8 vertical pixels and 8 horizontal pixels to simplify the description. Other configurations are the same as those of the first embodiment described above. In the figure, the numbers in parentheses shown together with the scanning lines G1-G8 indicate the driving order of the scanning lines G1-G8.

  FIG. 17 shows the timing for writing display data to the liquid crystal display device described above.

  A control circuit (not shown) is activated in the order of the scanning lines G1, G8, G3, G6, G2, G4, G5, and G7 in both the first field and the second field. Then, in the first field, the control circuit writes data corresponding to the first pixel area 20 in the display data in this area 20 and black data in the second pixel area 22. In the second field, the control circuit writes data corresponding to the second pixel area 22 in the display data, and writes black data in the first pixel area 20.

Also in this embodiment, the same effect as that of the first embodiment described above can be obtained. Further, in this embodiment, since the scanning lines G1-G8 are driven in a predetermined order not related to the arrangement order, the occurrence of flicker can be prevented more reliably.
(Eighth Embodiment of Liquid Crystal Display Device, Eighth Embodiment of Control Method of Liquid Crystal Display Device)
FIG. 18 shows an outline of the liquid crystal panel A in the TFT drive liquid crystal display device used in this embodiment. This embodiment corresponds to configurations 1 and 26. The same elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  The liquid crystal panel A has two strip-shaped first pixel regions 20 and two strip-shaped second pixel regions 22 alternately. The first pixel region 20 and the second pixel region 22 are partitioned corresponding to the liquid crystal cells C for three lines. The liquid crystal panel A has 12 pixels vertically and 8 pixels horizontally to simplify the description. Other configurations are the same as those of the first embodiment described above. In the figure, the numbers in parentheses shown together with the scanning lines G1-G12 indicate the driving order of the scanning lines G1-G12.

  FIG. 19 shows the timing for writing display data to the liquid crystal display device described above.

  A control circuit (not shown) is activated in the order of the scanning lines G1, G7, G4, G10, G2, G8, G5, G11, G3, G9, G6, and G12 in both the first field and the second field. That is, the control circuit performs line sequential scanning in the same first pixel region 20 and second pixel region 22. Then, in the first field, the control circuit writes data corresponding to the first pixel area 20 in the display data in this area 20 and black data in the second pixel area 22. In the second field, the control circuit writes data corresponding to the second pixel region 22 in the display data, and writes black data in the first pixel region 20.

Also in this embodiment, the same effects as those of the first and seventh embodiments described above can be obtained. Furthermore, in this embodiment, line sequential scanning is performed for a part of the area, so that flicker can be prevented more reliably without complicating the control circuit.
(Ninth Embodiment of Liquid Crystal Display Device)
FIG. 20 shows an outline of a TFT drive liquid crystal display device used in this embodiment. This embodiment corresponds to configurations 5 and 29. The same elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  In this embodiment, a plurality of liquid crystal cells C are arranged vertically and horizontally to constitute a liquid crystal panel A. On the back side of the liquid crystal panel A, fluorescent tubes F1-F4 are respectively arranged corresponding to the strip-like regions Gr.1, Gr.2, Gr.3, Gr4 partitioned by the liquid crystal cells C of a plurality of lines. . Each fluorescent tube F1-F4 may be composed of a plurality of fluorescent tubes. The control circuit 40 has a function of controlling on / off of the fluorescent tubes F1 and F3 and the fluorescent tubes F2 and F4 that are separated from each other, and a function of performing hold driving. The fluorescent tubes F1 and F3 blink as the first backlight, and the fluorescent tubes F2 and F4 blink as the second backlight.

  FIG. 21 shows the timing for writing display data to the liquid crystal display device described above. Here, in order to simplify the description, an example of the liquid crystal panel A constituted by 12 scanning lines G1-G12 is shown.

  The control circuit 40 performs hold driving for sequentially scanning the scanning lines G1-G3 and G7-G9 in the first field, and performs hold driving for sequentially scanning the scanning lines G4-G6 and G10-G12 in the second field. . Each scanning line G1-G12 is activated once in one frame period.

  The control circuit 40 turns on the fluorescent tubes F1 and F3 and turns off the fluorescent tubes F2 and F4 in the first field, turns off the fluorescent tubes F1 and F3, and turns on the fluorescent tubes F2 and F4 in the second field. As a result, pixels corresponding to the fluorescent tubes F1 and F3 are displayed in the first field, and pixels corresponding to the fluorescent tubes F2 and F4 are displayed in the second field. That is, the fluorescent tubes F1 and F3 and the fluorescent tubes F2 and F4 are alternately flashed to perform pseudo impulse driving.

Also in this embodiment, the same effect as that of the first embodiment described above can be obtained.
(10th Embodiment of a liquid crystal display device)
FIG. 22 shows an outline of a TFT drive liquid crystal display device used in this embodiment. The same elements as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  In this embodiment, the same liquid crystal panel A, fluorescent tubes F1-F4, Y driver 14 and X driver 16 as those in the ninth embodiment of the liquid crystal display device described above are provided. On the back side of the liquid crystal panel A, fluorescent tubes F1-F4 are respectively arranged corresponding to the strip-like regions Gr.1, Gr.2, Gr.3, Gr4 partitioned by the liquid crystal cells C of a plurality of lines. .

  The control circuit 41 has a function of sequentially turning on and off the fluorescent tubes F1-F4. Note that the control circuit 41 may turn on or turn off two or more regions at the same time. In this embodiment, the liquid crystal panel A is divided into four large regions Gr.1, Gr.2, Gr.3, and Gr4, but can be divided into two or more arbitrary numbers of groups.

  FIG. 23 shows the timing of writing display data to the above-described liquid crystal display device (including the timing of turning on and off the fluorescent tubes F1-F4). Here, in order to simplify the description, an example of a liquid crystal panel A composed of 12 scanning lines G1-G12 is shown.

  The turn-on / off cycle of each fluorescent tube F1-F4 coincides with one frame, that is, the scanning cycle of the liquid crystal panel. Region Gr.1 is composed of three small groups of pixels on each scanning line G1-G3. Similarly, the regions Gr.2, Gr.3, and Gr4 are each composed of three small groups.

  Hereinafter, the operation in the region Gr.1 will be mainly described.

  The control circuit 41 lights the fluorescent tube F1 corresponding to the region Gr.1 after a predetermined time T1 has elapsed after writing display data to the scanning lines G1-G3. Then, the control circuit 41 turns off the fluorescent tube F1 before the predetermined time T2 when the scanning line G1 is scanned. The predetermined time T can be set to “0”, but is preferably set to be longer than the time required to turn off the fluorescent tube F1. Thereby, mixing of displays can be prevented. Here, by setting the predetermined time T1 to ½ or more of the time of one frame (16 ms in this case), the time during which black is displayed becomes longer, and a better display can be realized.

  Here, it is desirable that the response of the liquid crystal element on the scanning line G3 last scanned in the region Gr.1 is completed before the fluorescent tube F1 is turned on. For this reason, the response time in all gradations of the liquid crystal element is preferably shorter than the predetermined time T1. For example, a π cell or a vertical electric field drive type horizontal electric field drive type liquid crystal display device may be used. At this time, the predetermined time T1 is desirably 4/5 or less of the time of one frame. Since one frame is generally 16 ms, it is desirable to adjust the response speed of the liquid crystal so that it is 10 ms or less between all gradations.

  Note that the control circuit 41 controls the regions Gr.2, Gr.3, and Gr4 in the same manner as the region Gr.1.

Also in this embodiment, the same effect as that of the first embodiment described above can be obtained.
(9th Embodiment of the control method of a liquid crystal display device)
FIG. 24 shows a liquid crystal display device 42 and a personal computer 44 used in this embodiment.

  The liquid crystal display device 42 has the same configuration as a conventionally used liquid crystal display device. The liquid crystal display device 42 includes a control circuit 46, an X driver, a Y driver, and a liquid crystal panel A. The control circuit 46 has an A / D conversion unit 48.

  The personal computer 44 includes a video card 50 that converts digital display data into analog data. The video card 50 has a function of converting display data for one frame into black data for each line during analog conversion. For this reason, black data is written to each line every other frame. The display data converted to black data may be discarded or used for display of the next frame. Then, the video card 50 sequentially sends display data having black data for each line to the A / D converter 48 of the liquid crystal display device 42.

  The liquid crystal display device 42 displays the received data on the liquid crystal panel A as it is. On the liquid crystal panel A, strip-shaped black data is displayed every other line.

  In this embodiment, even when a liquid crystal display device 42 similar to the conventional one is used, blurring of an image can be prevented and occurrence of flicker can be prevented.

In this embodiment, an example in which the video card 50 has a black data conversion function has been described. The present invention is not limited to such an embodiment. For example, the A / D converter 48 of the liquid crystal display device 42 may have a black data conversion function.
(10th Embodiment of the control method of a liquid crystal display device)
FIG. 25 shows a personal computer 52 used in this embodiment. The personal computer 52 has a built-in liquid crystal display device 54 such as a notebook type. The personal computer 52 includes a data conversion unit 58 that converts part of digital display data into black data.

  The data conversion unit 58 has a function of converting display data for one frame into black data for each line. For this reason, black data is written to each line every other frame. The display data converted to black data may be discarded or used for display of the next frame. The data converter 58 sequentially sends display data having black data for each line to the control circuit 56 of the liquid crystal display device 54. The liquid crystal display device 54 displays the received data on the liquid crystal panel A as it is. On the liquid crystal panel A, strip-shaped black data is displayed every other line. The data conversion unit 58 may be configured as an electronic circuit or a software program.

  Also in this embodiment, the same effect as that of the tenth embodiment of the liquid crystal display device control method described above can be obtained.

In this embodiment, an example in which the data conversion unit 58 has a black data conversion function has been described. The present invention is not limited to such an embodiment. For example, the control circuit 56 of the liquid crystal display device 54 may have a black data conversion function.
(Eleventh Embodiment of Control Method for Liquid Crystal Display Device)
FIG. 26 shows an outline of the liquid crystal display device 60 used in this embodiment.

  The control circuit 62 of the liquid crystal display device 60 includes a data conversion unit 64 that converts interlaced display data (TV signal) supplied from the outside. In addition, the liquid crystal display device 60 includes the same X driver, Y driver, and liquid crystal panel A as those of the conventional art.

  The data converter 64 has a function of receiving display data A1-A4 and B1-B4 of each field and inserting black data between these display data. The control circuit displays the data of each field in which black data is inserted on the liquid crystal panel A as one frame of data. On the liquid crystal panel A, a screen having strip-like black alternately every other line is displayed.

  Also in this embodiment, the same effect as that of the tenth embodiment of the liquid crystal display device control method described above can be obtained. Furthermore, in this embodiment, it is possible to construct a good screen without image blur using interlaced display data (TV signal).

In each of the embodiments described above, for example, as shown in the waveform of FIG. 4, the example in which the time for writing the display data is the same as the time for writing the black data has been described.
The present invention is not limited to such an embodiment. For example, the time for writing display data may be shorter than the time for writing black data. In this case, image blur can be further reduced.

In each of the above-described embodiments, the example in which the period of one frame is 16 ms has been described. The present invention is not limited to such an embodiment. The period of one frame may be determined according to the response time of the liquid crystal cell to be used.
(Eleventh Embodiment of Liquid Crystal Display Device)
FIG. 27 shows an outline of a TFT drive liquid crystal display device used in this embodiment.

  This embodiment corresponds to configurations 6, 7, and 11. The same elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  This liquid crystal display device includes TFTs and pixel electrodes 12 arranged in a matrix. The gate electrode of the TFT as a switching element is connected to the scanning lines G1, G2,. The scanning lines G1, G2,..., Gn are signal lines that transmit gate signals output from the Y driver 14. The drain electrode of the TFT is connected to signal lines D1, D2,..., Dm. The signal lines D1, D2,..., Dm are signal lines for transmitting data signals output from the X driver 16. The source electrode of the TFT is connected to the pixel electrode 12.

  A counter electrode (not shown) is disposed to face the pixel electrode 12. A liquid crystal (not shown) is sandwiched between the pixel electrode 12 and the counter electrode to form a liquid crystal cell C. And the liquid crystal panel A is comprised by the liquid crystal cell C arranged vertically and horizontally.

  The liquid crystal panel A is divided into five pixel regions 70 along the scanning direction of each scanning line Gn. A transparent light guide plate 72 made of an acrylic resin or the like is disposed on the back side of the liquid crystal panel A so as to face the liquid crystal panel A. At one end of the light guide plate 72 in the scanning direction of the scanning line Gn, a fluorescent tube (cold cathode tube) F5 is attached as a backlight.

  In this embodiment, the liquid crystal panel A is a 15-inch XGA liquid crystal panel. The liquid crystal panel A employs an improved VA (Vertical Alignment) type or OCB (Optically Compensated Birefringence) type. The response speed of the liquid crystal cell C of the liquid crystal panel A is as fast as about 7 ms.

  FIG. 28 shows details of the backlight.

  A polymer-dispersed liquid crystal film 74 is bonded to the surface of the light guide plate 72 opposite to the liquid crystal panel A. In this embodiment, a liquid crystal light control sheet “um film” manufactured by Nippon Sheet Glass is used for the liquid crystal film. The counter electrode (not shown) of the liquid crystal film 74 is divided into five along the light guide direction of the light emitted from the fluorescent tube F5, and five scattering portions 74a to 74e are formed. In the figure, for easy understanding, the liquid crystal film 74 is divided into five parts, but actually, the liquid crystal film 74 itself is composed of one sheet. The formation positions of the scattering portions 74a to 74e correspond to the five pixel regions 70 of the liquid crystal panel A, respectively.

  A scattering plate 76 such as a prism plate that scatters light emitted from the light guide plate 72 is bonded to the surface of the light guide plate 72 on the liquid crystal panel A side. A mirror 78 that reflects light toward the light guide plate 72 is bonded to the outer surface of the liquid crystal film 74.

  Immersion oil having a refractive index equivalent to that of an acrylic plate is used for bonding each member.

  In the example shown in the figure, no voltage is applied to the counter electrode of the scattering portion 74d shown by hatching. At this time, the scattering portion 74d becomes a scattering region for scattering light. A predetermined voltage is applied to the counter electrodes of the remaining four scattering portions 74a, 74b, 74c, and 74e. These scattering parts transmit light. As a result, light is irradiated only to the pixel region 70 of the liquid crystal panel facing the scattering portion 74d. The scattering region is easily formed and disappeared by controlling the counter electrode of each of the scattering portions 74a to 74e.

  Although not shown, by attaching mirrors or the like that reflect light to both ends (left and right in the figure) of the light guide plate 72, the light repeatedly travels in the light guide plate 72, is scattered by the scattering portion 74 d, and is guided. Led outside. That is, the light emitted from the fluorescent tube F5 is condensed and irradiated at a desired position.

  Thus, in this embodiment, since the light irradiated to the light-guide plate 72 can be used efficiently, power consumption can be reduced. In this example, the power consumption of the fluorescent tube F5 can be reduced to a maximum of 1/5. In addition, since a plurality of irradiation areas can be formed by one fluorescent tube F5, display unevenness due to deterioration of the fluorescent tube does not occur. The liquid crystal film 74 is bonded to the opposite side of the liquid crystal panel A in the light guide plate 72. For this reason, the light irradiated toward the liquid crystal panel A is not blocked by the liquid crystal film 74. Since the scattering portion is separated from the liquid crystal panel A, the boundary between adjacent irradiation regions can be made inconspicuous. The scattering portion can be easily formed by the polymer dispersion type liquid crystal film 74.

  FIG. 29 shows control of the liquid crystal panel A and the backlight in the liquid crystal display device described above. The vertical direction in the figure indicates time, and the horizontal direction in the figure indicates the direction in which light emitted from the fluorescent tube F5 is guided. The arrows in the figure indicate scanning of each scanning line Gn.

  In this embodiment, each scanning line Gn is scanned once in a period of one frame, line sequential scanning is performed by hold driving to write display data to the pixel electrode 12, and the scanning line Gn is directed in the lower right direction in the figure. Scanned sequentially. The backlight is turned on for a period of 3.2 ms after the scanning of the pixel region 70 of interest is completed. This 3.2 ms is one fifth of one frame time (16 ms) and is equal to the scanning period of one pixel region 70. The lighting of the backlight means that the scattering portions 74a to 74e of the liquid crystal film 74 are in a state of scattering light.

  For example, in the pixel region 70 corresponding to the scattering portion 74b, the time from when the last scanning line Gn is scanned until the backlight is turned on is 9.6 ms. This time indicates the worst response time of the liquid crystal cell C shown in FIG. 27, and is expressed by Expression (1) where n is the number of pixel regions 70.

1 frame time x (n-2) / (2 x n) .... (1)
Since the reaction speed of the liquid crystal of this embodiment is about 7 ms, the liquid crystal cell C in which the display data is written in the last scan of the pixel region 70 can surely complete the response until the backlight is turned on. As a result, it is possible to reduce the occurrence of blurring in the display of moving images.

In addition, in FIG. 28, the example which adhere | attached the scattering parts 74a-74e to the surface on the opposite side to the liquid crystal panel A in the light-guide plate 72 was described. For example, the scattering portions 74 a to 74 e may be bonded to the surface of the light guide plate 72 on the liquid crystal panel A side. In this case, the light irregularly reflected by the scattering portions 74 a to 74 e is irradiated toward the outside of the light guide plate 72. Then, light is irradiated to a predetermined irradiation area of the liquid crystal panel A. Since the boundary between adjacent irradiation regions becomes clear, impulse driving can be performed with higher visibility, and flickering can be prevented.
(Twelfth Embodiment of Liquid Crystal Display Device)
This embodiment corresponds to configuration 12. The configuration of the main part of this liquid crystal display device is the same as that of FIG. 27 except that the liquid crystal cell C is a π cell. The response time of the π cell is as fast as about 2 ms.

  FIG. 30 shows the details of the backlight used in this embodiment.

  In this embodiment, the same liquid crystal film 74 as that in FIG. 28 is sandwiched between two light guide plates 80. For this reason, the liquid crystal film 74 is reliably protected by the light guide plate 80. Further, because of the so-called sandwich structure, the light irradiation mechanism can be formed accurately and easily. FIG. 30 shows that the scattering portion 74d indicated by shading is a scattering region for scattering light.

  A scattering plate 76 such as a prism plate that scatters light emitted from the light guide plate 80 is bonded to the surface of the light guide plate 80 on the liquid crystal panel A side. A mirror 78 that reflects light toward the light guide plate 80 is bonded to the surface of the light guide plate 80 opposite to the liquid crystal panel A.

  FIG. 31 shows control of the liquid crystal panel A and the backlight in the liquid crystal display device described above.

  In FIG. 31, the vertical direction indicates time, and the horizontal direction in the figure indicates the direction of light guided from the fluorescent tube F5.

  In this embodiment, each scanning line Gn is scanned twice during a period of one frame, line sequential scanning is performed by impulse driving in which reset data (black) and display data are written to the pixel electrode, and the scanning line Gn is shown in FIG. Scans sequentially in the lower right direction. The gray arrow indicates scanning of each scanning line Gn for writing reset data, and the black arrow indicates scanning of each scanning line Gn for writing display data.

  The backlight is turned on for a period of 3.2 ms after the scanning of the pixel region 70 of interest is completed. This 3.2 ms is one fifth of one frame time (16 ms) and is equal to the scanning period of one pixel region 70. Display data is written 6.4 ms after reset data is written.

  For example, in the pixel region 70 corresponding to the scattering portion 74b, the time from when the last scanning line Gn is scanned until the backlight is turned on is 3.2 ms. This time indicates the worst response time of the liquid crystal cell C, and is expressed by the equation (2) where n is the number of pixel regions 70.

1 frame time × [[[(n−1) / (2 × n)] − 1 / n]... (2)
Since the reaction speed of the liquid crystal of this embodiment is about 2 ms, the liquid crystal cell C in which the display data is written in the last scan of the pixel region 70 can complete the response before the backlight is turned on. As a result, it is possible to reduce the occurrence of blurring in the display of moving images.

  When the pixel area 70 is an even number, the worst response time of the liquid crystal is expressed by Expression (3).

1 frame time × [[[(n−2) / (2 × n)] − 1 / n]... (3)
For example, in the case of the liquid crystal panel A divided into six pixel regions 70, a good display screen without blur can be obtained by using the liquid crystal cell C with a response time of about 2.6 ms or less.

  Also in this embodiment, the same effect as that of the embodiment shown in FIG. 27 can be obtained. Furthermore, in this embodiment, the liquid crystal film 74 can be reliably protected by sandwiching the liquid crystal film 74 between the light guide plates 80. The light irradiation mechanism composed of the light guide plate 80 and the scattering portions 74a to 74e can be accurately and easily formed.

In addition to sandwiching the liquid crystal film 74 between the two light guide plates 80, the liquid crystal film 74 may be further bonded to the outer surface of the light guide plate 80 as shown in FIG.
(13th Embodiment of a liquid crystal display device)
The configuration of the main part of the liquid crystal display device is the same as that shown in FIG. This embodiment corresponds to configuration 7.

  FIG. 33 shows details of the backlight used in this embodiment.

  In this embodiment, the light guide plate 82 is divided into five along the light guide direction of the light emitted from the fluorescent tube F5. Scattering portions 84 a to 84 d made of a polymer-dispersed liquid crystal film 84 are bonded to the end face of the adjacent light guide plate 82. The end surface of the light guide plate 82 is perpendicular to the light guide direction. A scattering portion 84e made of the liquid crystal film 84 is bonded to the end face of the light guide plate 82 located on the fluorescent tube F5 side. The scattering portions 84a to 84e are arranged perpendicular to the light guide direction while blocking the light guide direction. That is, the light passing through the light guide plate 82 always passes through the scattering portions 84a to 84e.

  FIG. 34 shows the detailed structure of the liquid crystal film 84.

  The liquid crystal film 84 has a structure in which a nematic liquid crystal 85a (low molecular liquid crystal) having a negative anisotropy of dielectric constant ε is covered with a resin layer 85b. The resin layer 85b is formed of a polymer liquid crystal. In this embodiment, an ultraviolet curable liquid crystal resin manufactured by Dainippon Ink is used for the resin layer 85b. The refractive index n1 in the radial direction of the liquid crystal and the refractive index n2 in the axial direction of the liquid crystal in the liquid crystal 85a and the resin layer 85b are the same.

  All the liquid crystals of the liquid crystal film 84 are aligned perpendicular to the surface of the liquid crystal film 84 in a state where no voltage is applied to the counter electrode, and transmit incident light. The nematic liquid crystal 85a of the liquid crystal film 84 tends to be perpendicular to the electric field when a voltage is applied to the counter electrode. Since the axial direction of the liquid crystal 85a is random, the incident light is scattered. The scattering portion 84d shown by shading in the figure is a scattering region where voltage is applied and light is scattered.

  The liquid crystal film 84 is manufactured by applying a vertical alignment film on a substrate, injecting a mixture of ultraviolet curable liquid crystal and low molecular liquid crystal, and curing the resin layer 85b with ultraviolet rays.

  FIG. 35 shows an example of a liquid crystal film formed of a normal resin layer (polymer).

  This type of liquid crystal film scatters oblique incident light because the liquid crystal layer and the resin layer have different refractive indexes. The liquid crystal film 84 shown in FIG. 34 transmits oblique incident light as it is.

  Also in this embodiment, the same effect as that of the embodiment shown in FIG. 30 can be obtained. Furthermore, in this embodiment, the light traveling in the light guide plate 82 always passes through one of the scattering portions 84a to 84e. For this reason, light can be reliably scattered.

  The scattering portions 84a to 84e were arranged perpendicular to the light guide direction. For this reason, the end surface of the light guide plate 82 only needs to be vertical, and the light guide plate 82 and the scattering portions 84a to 84e can be easily and accurately joined.

  The resin layer 85b covering the nematic liquid crystal 85a in the liquid crystal film 84 is composed of a polymer liquid crystal having a refractive index equal to that of the nematic liquid crystal 85a. For this reason, when the scattering portions 84a to 84e transmit light, scattering occurring at the interface between the nematic liquid crystal 85a and the resin layer 85b can be prevented.

The nematic liquid crystal 85a and the polymer liquid crystal can obtain the same effect even when they are aligned perpendicular to the light guide direction in a state where no voltage is applied to the counter electrode.
(Fourteenth Embodiment of Liquid Crystal Display Device)
This embodiment corresponds to configuration 7. The configuration of the main part of the liquid crystal display device is the same as that shown in FIG.

  FIG. 36 shows details of the backlight used in this embodiment.

  In this embodiment, the scattering portions 84a to 84e are arranged obliquely along the light guide direction of the light emitted from the fluorescent tube F5. The other structure is the same as FIG.

In this embodiment, the light transmitted through the inside can always be scattered by the scattering portions 84a to 84e, and the scattered light can be irradiated in a large amount toward the liquid crystal panel A.
(15th Embodiment of a liquid crystal display device, 12th Embodiment of the control method of a liquid crystal display device)
FIG. 37 shows an outline of a TFT drive liquid crystal display device used in this embodiment. This embodiment corresponds to configurations 8 and 30. The same elements as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  In this embodiment, a plurality of liquid crystal cells C are arranged vertically and horizontally to constitute a liquid crystal panel A. A backlight 88 including a light guide plate 72, a liquid crystal film 74, and a fluorescent tube F5 is disposed on the back side of the liquid crystal panel A. The control circuit 90 receives the output of the manual switch SW and the display data, and controls the Y driver 14, the X driver 16, and the backlight 88.

  The manual switch SW is a switch for adjusting a light emission time which is a period between writing display data and writing reset data. That is, a person watching the display image on the liquid crystal panel can freely adjust the light emission time.

  The control circuit 90 scans each scanning line Gn twice in one frame period, and performs line sequential scanning by impulse driving for writing display data and reset data (black) into the liquid crystal cell C. The control circuit 90 controls the backlight 88 and irradiates light sequentially from the scattering portions 74 a to 74 e formed on the light guide plate 72 in synchronization with writing of display data. That is, the light emission time is adjusted by the impulse drive of the liquid crystal panel A and the backlight control.

  Further, the control circuit 90 adjusts the irradiation intensity of the fluorescent tube F5 according to the operation of the manual switch SW, and keeps the display brightness of the liquid crystal panel constant.

  In this embodiment, the person viewing the display image can directly adjust the display image so that it is most easy to see by operating the manual switch SW. For example, the light emission time is lengthened when viewing a still image and shortened when viewing a moving image. In this way, since adjustment can be made according to the feeling of the person viewing the display image, blurring of the moving image can be reduced and flicker can be prevented.

  The display brightness of the liquid crystal panel A was controlled so as to be kept constant in conjunction with the control of the light emission time. Regardless of whether the image is a still image or a moving image, the display luminance is always maintained at a constant luminance, so that the screen is easy to see.

  The light emission time may be adjusted by opening / closing control of the shutter by arranging a shutter made of liquid crystal or the like on the front surface of the liquid crystal panel A.

Further, the luminance adjustment of the display image may be adjusted by the signal amount of display data written to the liquid crystal cell C.
(16th Embodiment of a liquid crystal display device, 13th Embodiment of the control method of a liquid crystal display device)
FIG. 38 shows an outline of a TFT drive liquid crystal display device used in this embodiment. This embodiment corresponds to configurations 9 and 31. The same elements as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  In this embodiment, as in the above-described embodiment, the light emission time is adjusted by impulse driving of the liquid crystal panel A and backlight control.

  The control circuit 92 receives information from the discrete cosine transform (DCT) unit 94 that predicts the movement of the display data, determines whether the display data is a still image or a moving image, and emits light according to each image. Control the time. Specifically, the control circuit 92 determines that the display image is a moving image when the prediction of the movement of the DC component in the discrete cosine transform exceeds the size of one block (16 pixels × 16 lines). When it is determined as a moving image, the light emission time is shortened. Further, the brightness of the backlight 88 is increased, and the display brightness of the liquid crystal panel A is kept constant.

  By using the information of the discrete cosine transform, it is possible to prevent a continuous still image from being determined as a moving image due to fluctuation of an analog signal. In particular, it is desirable to determine a moving image when the DC component changes by 10% or more.

  In this embodiment, it is determined whether the display data is a still image or a moving image based on the information of discrete cosine transform, and the light emission time is adjusted. By shortening the light emission time when displaying a moving image, blurring of the moving image can be reduced and occurrence of flicker can be prevented.

  A still image and a moving image can be reliably determined using a method of discrete cosine transform widely used for motion compensation of moving images.

The light emission time may be adjusted by opening / closing control of the shutter by arranging a shutter made of liquid crystal or the like on the front surface of the liquid crystal panel A.
(Seventeenth Embodiment of Liquid Crystal Display Device)
FIG. 39 shows an outline of a TFT drive liquid crystal display device used in this embodiment. This embodiment corresponds to configuration 10. The same elements as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  The configuration of the main part of the liquid crystal display device is the same as that in FIG.

  The control circuit 96 has a function of switching between hold driving and impulse driving. The control circuit 96 performs hold driving when the display data is a still image, and performs impulse driving when the display data is a moving image. The control circuit 96 performs impulse driving by impulse control of the scanning line Gn and backlight blinking control.

  A display image is determined to be a moving image when the proportion of pixels of the display image of one frame that differs from the pixels of the display image of one frame displayed last time exceeds 10%. That is, when the ratio of moving images in the display data is equal to or greater than a predetermined value, the control is switched from hold driving to impulse driving.

  Further, the control circuit 96 increases the luminance of the backlight 88 when displaying a moving image, and makes the display luminance of the liquid crystal panel A the same as that for a still image. For this reason, the display brightness of the liquid crystal panel A is constant regardless of the impulse drive and the hold drive. In other words, the display brightness can be lowered when the image is a still image, and the power consumption can be reduced.

In this embodiment, a polysilicon TFT is used as the switching element.
Since the pixel electrode is controlled by a polysilicon TFT whose switching speed is higher than that of an amorphous silicon TFT, blurring of a moving image can be reduced particularly during impulse control.

  Also in this embodiment, blurring can be reduced in the moving image and flicker can be prevented as in the above-described embodiment.

  Note that the present invention is not limited to the above-described embodiment, and when the display data changes over two frames or more, it may be determined as a moving image and switched from hold driving to impulse driving.

  Also, motion compensation is performed by discrete cosine transform, and when the average value of each DC component in the display image of one frame and the display image of one frame displayed last time is different by a predetermined value or more, it is determined as a moving image and held. Switching from driving to impulse driving may be performed.

  Alternatively, motion compensation may be performed by discrete cosine transform, and when the compressed image information includes vector information indicating the motion of the image, it may be determined as a moving image and switched from hold driving to impulse driving.

Further, a shutter made of liquid crystal or the like may be disposed on the front surface of the liquid crystal panel A, and the light emission time during impulse driving may be adjusted by shutter opening / closing control.
(Eighteenth Embodiment of Liquid Crystal Display Device)
This embodiment corresponds to configuration 13. The configuration of the main part of the liquid crystal display device is the same as that shown in FIG. The same elements as those in FIG. 27 are denoted by the same reference numerals, and detailed description thereof will be omitted.

  FIG. 40 shows details of the backlight unit BLU used in this embodiment.

  The backlight unit BLU has a light guide plate 102. A polarization separation sheet 104a (first polarization separation sheet), a liquid crystal shutter 106, a polarization separation sheet 104b (second polarization separation sheet), and a scattering sheet 108 are sequentially bonded to the surface of the light guide plate 102 opposite to the liquid crystal panel A. Has been. The polarization separation sheets 104a and 104b have a function of transmitting only the ordinary light component of the non-polarized light and reflecting the other component (abnormal light component).

  In this embodiment, an acrylic plate (refractive index: about 1.5) is used as the light guide plate 102, and “Transmax” manufactured by Merck Japan Co., Ltd. is used as the polarization separation sheets 104a and 104b. “Transmax” is formed using a cholesteric liquid crystal. The liquid crystal shutter 106 is divided into ten regions (only three regions are shown in the figure) along the scanning direction of the scanning lines. The liquid crystal shutter 106 has a function of sequentially opening (transmitting) each area in accordance with the impulse control of the liquid crystal panel A. “Transmax” and the refractive index of the liquid crystal shutter 106 are about 1.5, similar to the light guide plate 102. The scattering sheet 108 is formed using a milky white resin plate. The liquid crystal panel A is a 15-inch XGA liquid crystal panel.

  Next, the operation of the backlight unit BLU will be described.

The light (unpolarized light) emitted from the fluorescent tube F5 travels while totally reflecting (in the range of 0 to 41 °) in the light guide plate 102. The extraordinary light component of the light is reflected by the polarization separation sheet 104a and travels while being totally reflected again in the light guide plate 102 (FIG. 40 (a)).
The ordinary light component of the non-polarized light passes through the polarization separation sheet 104 a and reaches the liquid crystal shutter 106. When the liquid crystal shutter 106 is in a birefringence state (shaded portion in the figure), the light transmitted through the polarization separation sheet 104a is shifted in phase by 90 ° by the liquid crystal shutter 106 and reaches the polarization separation sheet 104b as an extraordinary light component (FIG. 40). (b)). The light is reflected by the polarization separation sheet 104b, and is again shifted in phase by 90 ° by the liquid crystal shutter 106 to return to the original ordinary light component. Thereafter, the light passes through the polarization separation sheet 104a and returns to the light guide plate 102 again (FIG. 40 (c)). On the other hand, when the liquid crystal shutter 106 is not in the birefringence state (transmission state, transparent portion in the figure), the light (ordinary light component) transmitted through the polarization separation sheet 104a is transmitted through the liquid crystal shutter 106 and the polarization separation sheet 104b, and the scattering sheet 108. It is scattered (reflected) by (FIG. 40 (d)). The light irregularly reflected by the scattering sheet passes through the polarization separation sheet 104b, the liquid crystal shutter 106, and the polarization separation sheet 104a again, and returns to the light guide plate 102. At this time, most of the light components exceed the critical angle and are transmitted through the light guide plate 102 and irradiated toward the liquid crystal panel A (FIG. 40 (e)).

  The liquid crystal display device can be easily impulse-driven by sequentially setting a predetermined area of the liquid crystal shutter in a transmissive state in accordance with the control of the liquid crystal panel. For this reason, blurring of moving images is reduced, and flickering is prevented.

  Although not shown, by attaching mirrors or the like that reflect light to both ends (left and right in the figure) of the light guide plate 102, the light repeatedly travels in the light guide plate 102 and starts from a predetermined region of the liquid crystal shutter 106. Irradiate toward A. That is, the light emitted from the fluorescent tube F5 is condensed and irradiated at a desired position.

Thus, in this embodiment, since the light irradiated to the light-guide plate 102 can be used efficiently, power consumption can be reduced. In this example, the power consumption of the fluorescent tube F5 can be reduced to a maximum of 1/10. In addition, since a plurality of irradiation areas can be formed by one fluorescent tube F5, display unevenness due to deterioration of the fluorescent tube does not occur.
(Nineteenth Embodiment of Liquid Crystal Display Device)
The configuration of the main part of the liquid crystal display device is the same as that in the eighteenth embodiment. This embodiment corresponds to configurations 13 and 14. The same elements as those in the eighteenth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  FIG. 41 shows details of the backlight unit BLU used in this embodiment.

  In this embodiment, a retardation sheet 110 having a retardation of 100 nm is attached to the light guide plate 102 on the back panel A side. The retardation value of the retardation sheet 110 is not particularly limited. The other configuration is the same as FIG.

  FIG. 42 shows the slow axis A1 of the retardation film 110, the transmission axis A2 of the polarization separation sheet 104a, the liquid crystal orientation direction A3 of the liquid crystal shutter 106, and the transmission axis A4 of the polarization separation sheet 104b. In this embodiment, the directions of the transmission axes A2 and A4 are aligned with the alignment direction A3 of the liquid crystal. The direction of the slow axis A1 may be arbitrary.

  As shown in FIG. 41, the light traveling in the light guide plate 102 is shifted in phase by the phase difference sheet 110. That is, the light totally reflected in the light guide plate 102 (abnormal light component) is shifted in phase by the phase difference sheet 110 and includes an ordinary light component. That is, the ordinary light component transmitted through the polarization separation sheet 104a can be increased.

Also in this embodiment, the same effect as that in the eighteenth embodiment can be obtained. Furthermore, in this embodiment, since the light use efficiency is improved, the power consumption can be further reduced.
(20th Embodiment of Liquid Crystal Display Device)
The configuration of the main part of the liquid crystal display device is the same as that in the eighteenth embodiment. This embodiment corresponds to configurations 13 and 15. The same elements as those in the eighteenth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  FIG. 43 shows the details of the backlight unit BLU used in this embodiment.

  In this embodiment, a prism sheet 112 formed of a plurality of prisms 112a is bonded instead of the scattering sheet 108. The other configuration is the same as FIG.

  The prism surface of each prism 112a has a reflective film 112b deposited with aluminum or the like. Each prism 112 a is designed to emit incident light at ± 20 ° with respect to the vertical direction of the liquid crystal panel A. That is, the ordinary light component that passes through the liquid crystal shutter 106 is reflected by the prism sheet 112 and is irradiated almost vertically toward the liquid crystal panel A.

Also in this embodiment, the same effect as that in the eighteenth embodiment can be obtained. Furthermore, in this embodiment, light of a predetermined angle can be irradiated toward the liquid crystal panel A by the action of the prism sheet 112, so that the irradiation intensity can be increased.
(21st Embodiment of a liquid crystal display device)
The configuration of the main part of the liquid crystal display device is the same as that in the eighteenth embodiment. This embodiment corresponds to configurations 13 and 15. The same elements as those in the eighteenth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  FIG. 44 shows the details of the backlight unit BLU used in this embodiment.

  In this embodiment, a polarization separation sheet 104a, a liquid crystal shutter 106, a polarization separation sheet 104b, and a prism sheet 112 are sequentially bonded to the light guide plate 102 on the liquid crystal panel A side. This prism sheet 112 does not have a reflective film on the prism surface 102b.

  The mechanism by which light traveling through the light guide plate 102 is transmitted and reflected through the polarization separation sheets 104a and 104b and the liquid crystal shutter 106 is the same as that in the eighteenth embodiment. The light transmitted through the liquid crystal shutter 106 in the transmissive state is refracted by the prism surface 112b and irradiated toward the liquid crystal panel A.

Also in this embodiment, the same effects as those of the eighteenth and twentieth embodiments can be obtained.
(Twenty-second embodiment of liquid crystal display device)
The configuration of the main part of the liquid crystal display device is the same as that of the twenty-first embodiment. This embodiment corresponds to configurations 13 to 15. The same elements as those in the twenty-first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  FIG. 45 shows details of the backlight unit BLU used in this embodiment.

In this embodiment, a phase difference sheet 110 is affixed to the surface of the light guide plate 102 opposite to the back panel A. Also in this embodiment, the same effects as those of the nineteenth and twenty-first embodiments can be obtained.
(23rd Embodiment of a liquid crystal display device)
The configuration of the main part of the liquid crystal display device is the same as that in the eighteenth embodiment. This embodiment corresponds to configuration 13. The same elements as those in the eighteenth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  FIG. 46 shows details of the backlight unit BLU used in this embodiment.

  In this embodiment, the polarization separation sheet 104a, the liquid crystal shutter 106, and the polarization separation sheet 104b are arranged on the liquid crystal panel A side of the light guide plate 102 via the air layer 114. A plurality of scattering patterns 116 are printed on the surface of the light guide plate 102 opposite to the liquid crystal panel A at intervals. The scattering pattern 116 may be formed in a stripe pattern or a check pattern. Further, a reflector 118 is disposed on the side of the light guide plate 102 opposite to the liquid crystal panel A.

  Of the light traveling in the light guide plate 102 (unpolarized light), the component exceeding the critical angle due to the scattering pattern 116 is irradiated from the light guide plate 102 to the polarization separation sheet 104a through the air layer 114 (FIG. 46 ( a)). Of this light, the extraordinary light component is reflected by the polarization separation sheet 104a and returned again into the light guide plate 102 through the air layer 114 (FIG. 46 (b)). The ordinary light component of the light passes through the polarization separation sheet 104 a, passes through the polarization separation sheet 104 a, and reaches the liquid crystal shutter 106. When the liquid crystal shutter 106 is in the birefringence state (the shaded portion in the figure), the ordinary light component of the light transmitted through the polarization separation sheet 104a is transmitted through the polarization separation sheet 104a, and the phase is shifted by 90 ° by the liquid crystal shutter 106. The light is reflected by the polarization separation sheet 104b and returned again into the light guide plate 102 (FIG. 46 (c)). On the other hand, when the liquid crystal shutter 106 is not in the birefringence state (transmission state, transparent portion in the figure), the light (ordinary light component) transmitted through the polarization separation sheet 104a is transmitted through the liquid crystal shutter 106 and the polarization separation sheet 104b, and the liquid crystal panel A (FIG. 46 (d)).

Also in this embodiment, the same effect as that in the eighteenth embodiment can be obtained. Furthermore, in this embodiment, the light traveling in the light guide plate 102 easily exceeds the critical angle by the scattering pattern 116, so that the light utilization efficiency can be improved.
(24th Embodiment of Liquid Crystal Display Device)
The configuration of the main part of the liquid crystal display device is the same as that in the twenty-fourth embodiment. This embodiment corresponds to configuration 13. The same elements as those in the twenty-fourth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  FIG. 47 shows details of the backlight unit BLU used in this embodiment.

  In this embodiment, a polarization separation sheet 120 is used instead of the polarization separation sheet 104a. The polarization separation sheet 120 has a characteristic of transmitting an ordinary light component and irregularly reflecting an abnormal light component. As the polarization separating sheet 120, for example, “DRPF (Diffuse Reflective Polarizing film)” manufactured by 3M Company is used.

  Of the light irradiated from the light guide plate 102 to the polarization separation sheet 120 via the air layer 114, the abnormal light component is irregularly reflected by the polarization separation sheet 120 and returned to the light guide plate 102 again. Other operations are the same as those in the twenty-third embodiment.

  Also in this embodiment, the same effect as that in the twenty-third embodiment can be obtained.

The polarization separation sheets 104a and 104b used in the above-described eighteenth to twenty-fourth embodiments are not limited to “Transmax”. The polarization separation sheets 104a and 104b may be formed by laminating a plurality of films having different refractive indexes, or may be formed by using a prism array including a plurality of prisms. For example, “D-BEF” manufactured by 3M can be used as a polarization separation sheet in which a plurality of films are laminated. As the prism array, for example, “Weber” manufactured by 3M can be used.
(25th Embodiment of Liquid Crystal Display Device)
FIG. 48 shows an outline of a TFT drive liquid crystal display device used in this embodiment.

  This embodiment corresponds to configurations 16 to 18. The same elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  This liquid crystal display device includes a liquid crystal panel A having TFTs and liquid crystal cells C arranged in a matrix. The size of the liquid crystal cell C is approximately 100 μm × 300 μm. The gate electrode of the TFT as a switching element is connected to the scanning lines G1, G2,. The drain electrode of the TFT is connected to signal lines D1, D2,..., Dm. The source electrode of the TFT is connected to the display electrode 122 of the liquid crystal cell C described later. A second pixel electrode 124 is formed below the display electrode 122 along the scanning line Gn. The width of the second pixel electrode 124 is about 10 μm. In this embodiment, the liquid crystal mode of the liquid crystal panel is normally black that transmits light when an electric field is present. The liquid crystal panel A employs a liquid crystal having a high response speed such as a VA (Vertical Alignment) type or an OCB (Optically Compensated Birefringence) type. The liquid crystal panel A may be a twisted nematic (TN) type.

  FIG. 49 shows a cross section taken along the signal line Dm in the liquid crystal cell C of FIG.

  The liquid crystal cell C is formed by sandwiching a liquid crystal layer 130 between a CF substrate 126 and a TFT substrate 128. A first pixel electrode 132 is formed inside the CF substrate 126, and a display electrode 122 is formed inside the TFT substrate 128. The first pixel electrode 132 is connected to the ground line. A second pixel electrode 124 is formed inside the TFT substrate 128. The second pixel electrode 124 is connected to the ground line.

  A thin film 134 made of amorphous silicon having a thickness of 0.4 μm and a width of 10 μm is formed between the second pixel electrode 124 and the display electrode 122 by using a CVD technique. The resistivity of amorphous silicon is 1E8 to 1E9 Ωcm, which is lower than that of the liquid crystal layer (1E14 Ωcm). The relative dielectric constants of the amorphous silicon and the liquid crystal layer 130 are 5 and 12, respectively. The thin film 134 forms an auxiliary capacitor.

  FIG. 50 shows an equivalent circuit of the liquid crystal cell C shown in FIG.

  The liquid crystal cell C can be regarded as two CR time constant circuits in which a liquid crystal layer capacitor CLC and resistor RLC and an auxiliary capacitor capacitor CS and resistor RS are connected in parallel. The transient phenomenon of this equivalent circuit is expressed by equations (4) to (6) where time is t and voltage is V.

V (t) ＝ V0 ・ exp （−t / CR） .... (4)
C = CLC + CS ..... (5)
R = (RLC × RS) / (RLC + RS) ..... (6)
FIG. 51 shows a state in which display data (white) is written in the liquid crystal cell C described above.

  First, the scanning line Gn is selected, and display data is written into the liquid crystal cell C. A predetermined voltage is applied between the first pixel electrode 132 and the display electrode 122, and the transmittance of the liquid crystal layer 130 increases. Here, since the voltage between both electrodes decreases according to the equation (4), the transmittance of the liquid crystal layer 130 decreases. Therefore, the liquid crystal cell C is automatically reset after displaying the display data. That is, black data is displayed. As a result, impulse driving for displaying the display data and the reset data in a period of 1 frame (16.7 ms) can be performed. Note that the transmittance can be increased by writing display data at a voltage higher than or equal to the saturation voltage.

  Next, the contents studied in the present invention are shown.

  FIG. 52 shows a change in applied voltage due to the CR time constant of the equivalent circuit shown in FIG. In order to display black data in the latter half of one frame period, the applied voltage is desirably 20% or less of the initial voltage after 16.7 ms. At this time, the CR time constant becomes 0.01 or less.

  FIG. 53 shows a change in applied voltage when a CR time constant circuit is formed using amorphous silicon. Amorphous silicon satisfies the conditions described in FIG.

FIG. 54 shows changes in applied voltage depending on the film thickness d [μm] and area S [μm ² ] of amorphous silicon. It can be seen that the condition described in FIG. 52 is satisfied when (film thickness d / area S) <2000 [1 / μm]. As a result, even if the width of the amorphous silicon is 3 μm (the minimum pattern in this manufacturing process), the impulse drive can be sufficiently performed. The smaller the area S of the amorphous silicon (auxiliary capacitor), the higher the aperture ratio of the liquid crystal cell C, and the liquid crystal panel A with high luminance can be formed. Note that the area of the auxiliary capacitor is desirably 10% or less of the area of the display electrode 122.

  FIG. 55 shows changes in applied voltage due to variations in the film thickness of amorphous silicon. In general, in the semiconductor manufacturing process, the fluctuation of the film thickness must take into account about ± 5%. On the other hand, when the variation of the film thickness exceeds ± 5%, the luminance unevenness of the liquid crystal panel A may occur. In FIG. 55, when (film thickness d / area S) <400 [1 / μm], an error in the CR time constant with respect to ± 5% film thickness variation is not observed. That is, if (film thickness d / area S) <400 [1 / μm], the luminance unevenness of the liquid crystal panel A hardly occurs.

  As described above, in the liquid crystal display device of the present invention, the liquid crystal panel A can be impulse-driven by using the charge / discharge characteristics of the liquid crystal cell C without using a special control circuit. As a result, blurring of moving images can be reduced and flicker can be prevented.

  In the above-described embodiment, the example in which the auxiliary capacitor is formed of amorphous silicon has been described. However, the auxiliary capacity may be formed of a composite material of silicon nitride and silicon carbide. At this time, the film may be formed by CVD using a mixed gas containing silicon nitride and silicon carbide. A two-layer film may be formed by forming silicon nitride and silicon carbide, respectively. A film made of silicon nitride and a film made of silicon carbide may be formed adjacent to each other.

Further, a luminance correction circuit that adjusts a difference in luminance of the liquid crystal cell C with respect to a change in film thickness may be provided. In this case, even if the variation in film thickness exceeds ± 5%, the occurrence of luminance unevenness can be prevented.
(26th Embodiment of a liquid crystal display device)
FIG. 56 shows the details of the liquid crystal panel A used in this embodiment. The configuration of the main part of the liquid crystal display device is almost the same as that shown in FIG.

  This embodiment corresponds to configurations 19 to 21. The same elements as those in the twenty-fifth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  The liquid crystal panel A has liquid crystal cells C arranged in a matrix. The pixel electrode of the liquid crystal cell C is connected to the source electrodes of two TFTs (thin film transistors) 136 and 138. The threshold voltage of the TFT 138 is set higher than the threshold voltage of the TFT 136. The drain electrode of the TFT 136 is connected to the signal line Dm. The drain electrode of the TFT 138 is connected to an electrode 140 to which a voltage corresponding to reset data (black data) is supplied. The electrode 140 is formed along the signal line Dm. The gate electrode of the TFT 138 is connected to the scanning line Gn + 1 (scanning line to be scanned later) adjacent to the scanning line Gn for controlling the TFT 136 connected to the same liquid crystal cell C as the TFT 138. In other words, the gate electrode of the TFT 136 and the gate electrode of the TFT 138 respectively connected to the liquid crystal cell C (pixel electrode) adjacent in the scanning direction of the scanning line are connected to the same scanning line Gn. Since the number of scanning lines Gn is the same as the conventional one, it is possible to prevent the transmission efficiency of the liquid crystal panel A from being reduced.

  In this embodiment, the liquid crystal mode of the liquid crystal panel A is normally black that transmits light when an electric field is present. The liquid crystal panel A employs a liquid crystal having a high response speed such as a VA (Vertical Alignment) type or an OCB (Optically Compensated Birefringence) type. The liquid crystal panel A may be a ferroelectric type, an antiferroelectric type, or a twisted nematic (TN) type.

  FIG. 57 shows the structure of the TFT 136. Note that the TFT 138 also has substantially the same structure.

  The TFT 136 is formed by allowing a gate electrode 136b and a semiconductor layer 136c to face each other through a gate insulating film 136a, and connecting a data electrode 136d (drain electrode) and a pixel electrode 136e (source electrode) to the semiconductor layer 136c. .

  The threshold voltages of the TFT 136 and the TFT 138 are adjusted by changing the thickness of the gate insulating film 136a. Specifically, the TFT 138 has a thicker gate insulating film than the TFT 136. In addition to the above, the threshold voltage is similar to that of a general MOSFET, (1) changing the material of the gate insulating film 136a, (2) changing the material of the semiconductor layer 136c, and (3) changing the impurity concentration of the semiconductor layer 136c. Can also be adjusted.

  FIG. 58 shows the operation of the liquid crystal panel A.

  In this embodiment, the scanning line Gn is selected twice in one frame period (16.7 ms), and the line sequential operation is executed. The second selection of the scanning line Gn is performed at a higher voltage than the first selection. Specifically, the voltage for first selecting the scanning line Gn is higher than the threshold voltage of the TFT 136 and lower than the threshold voltage of the TFT 138. The voltage for selecting the scanning line Gn for the second time is higher than the threshold voltage of the TFT 138.

  First, the scanning line Gn is selected, and display data is written into the liquid crystal cell C (shaded portion of the display screen (a)). Since the voltage of the scanning line Gn is lower than the threshold voltage of the TFT 138, the reset data is not written. Each of the screen displays (a) to (d) displays only the change of the liquid crystal cell C corresponding to the scanning line Gn of interest.

  Next, the scanning line Gn + 1 is selected, and display data is written into the liquid crystal cell C (shaded portion of the display screen (b)).

  The second selection (high voltage) is performed 5 ms after the first scanning line Gn is selected. At this time, display data corresponding to another scanning line is written into the liquid crystal cell C corresponding to the scanning line Gn. At the same time, reset data (black data) is written into the liquid crystal cell C corresponding to the scanning line Gn-1 (shaded portion and black portion of the display screen (c)).

  Next, the scanning line Gn + 1 is set to a high voltage, and display data corresponding to another scanning line is written into the liquid crystal cell C corresponding to the scanning line Gn + 1. At the same time, reset data (black data) is written into the liquid crystal cell C corresponding to the scanning line Gn (shaded portion and black portion of the display screen (d)). That is, invalid display data written in the liquid crystal cell C corresponding to the scanning line Gn on the display screen (c) is immediately overwritten with black data.

As described above, in the liquid crystal display device of this embodiment, the impulse drive for alternately writing the display data and the reset data can be performed without increasing the number of scanning lines Gn and without complicating the control circuit. Moving image blur can be reduced and flicker can be prevented.
(27th Embodiment of Liquid Crystal Display Device)
FIG. 59 shows the details of the liquid crystal panel A used in this embodiment. The configuration of the main part of the liquid crystal display device is almost the same as that shown in FIG.

  This embodiment corresponds to configurations 19 to 21. The same elements as those in the twenty-sixth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  In this embodiment, an electrode 140 to which a voltage corresponding to reset data (black data) is supplied is formed along the scanning line Gn. Other configurations are the same as those in the twenty-sixth embodiment.

This embodiment can offer the same effects as those of the 26th embodiment described above.
(14th Embodiment of the control method of a liquid crystal display device)
FIG. 60 shows an outline of a TFT drive liquid crystal display device used in this embodiment.

  This embodiment corresponds to configurations 32 to 34. The same elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  This liquid crystal display device includes a liquid crystal panel A having TFTs and liquid crystal cells C arranged in a matrix. The scanning lines G1, G2,..., Gn are signal lines that transmit a gate signal output from the Y driver (gate driver) 14. The signal lines D1, D2,..., Dm are signal lines that transmit data signals output from the X driver (data driver) 16. The Y driver 14 and the X driver 16 are controlled by a control circuit 18. The control circuit 18 receives display data and a clock from the outside. The control circuit 18 outputs to the Y driver 14 a scan start signal GSTR, a clock signal GCLK, a gate signal control signal DTGOE for writing display data, and a gate signal control signal BLGOE for writing reset data (black data). ing. The control circuit 18 outputs the display data DISP for one line and the driver output control signal LP for controlling the output timing of the display data to the X driver 16.

  FIG. 61 shows the details of the control circuit 18.

  The control circuit 18 includes a data capturing unit 18a, a data driver control unit 18b, a gate driver control unit 18c, a gate scanning line determination unit 18d, a GOE creation unit 18e, a gate scanning condition storage unit 18f, a non-scanning period determination unit 18g, The non-scanning period storage unit 18h is included.

The data capturing unit 18a captures display data and a clock, and outputs the captured signal to the data driver 18b and the gate driver control unit 18c.
The data driver control unit 18b generates display data DISP and a driver output control signal LP. The gate driver control unit 18c receives the gate signal control signal DTGOE and the gate signal control signal BLGOE generated by the GOE generation unit 18e, and outputs the gate signal control signal DTGOE and the gate signal control signal BLGOE. Yes. The gate scanning line determination unit 18d detects that 1/2 frame has been scanned from the start of writing display data, and then controls the gate driver control unit 18c to write a gate signal control signal for writing black data. Output BLGOE.

  The gate scanning condition storage unit 18f stores the scanning condition of the gate signal in the previous frame. The non-scanning period determination unit 18g counts how many times the gate signal can be scanned in the non-scanning period, which is a period from the scanning of the last scanning line for writing display data to the end of the frame. The non-scanning period storage unit 18h stores the value counted by the non-scanning period determination unit 18g.

  The gate driver control unit 18c and the data driver control unit 18b receive only the values stored in the non-scanning period storage unit 18h under the control of the non-scanning period determination unit 18g after scanning the last scanning line for writing display data. , Operate to write black data. The display on the liquid crystal panel A will be described in detail with reference to FIG.

  FIG. 62 shows the operation of the control circuit 18.

  First, at the start of one horizontal period, the driver output control signal LP is output once. The display data DOUT is latched at the falling edge of the driver output control signal LP, and then the display data DOUT is output during the low level period of the driver output control signal LP. The black data DOUT is output during the high level period of the driver output control signal LP. Here, the voltage of the black data is the center voltage (VDD / 2) of the AC power source that generates the display data.

  The gate signal control signal DTGOE becomes low level during the low level period of the driver output control signal LP, and the gate signal control signal BLGOE becomes low level during the high level period of the driver output control signal LP. A gate signal Gn (BL) for writing black data is generated from the high level of the basic gate signal GOUT generated inside the control circuit 18 and the low level of the gate signal control signal BLGOE. Similarly, a gate signal Gn (DT) for writing display data is generated from the high level of the basic gate signal GOUT and the low level of the gate signal control signal DTGOE. Then, black data (DOUT) is written in synchronization with the gate signal Gn (BL), and display data (DOUT) is written in synchronization with the gate signal Gn (DT) to be written. That is, the control circuit 18 of the present embodiment can output not only display data but also black data (binary output) in one horizontal period.

  FIG. 63 shows the operation of the liquid crystal panel A.

  The scanning lines G1-Gn are sequentially scanned during one frame period, and display data is written. After 1/2 frame from the writing of the display data, the scanning lines G1-Gn are sequentially scanned again, and black data (B) is written. That is, impulse driving is performed. As described above, the black data is written using the data DOUT output during the high level period of the driver output control signal LP.

  The control circuit 18 controls to sequentially scan the scanning lines G1 to Gn and write black data even in the non-scanning period. For this reason, the display data holding period T1 during which display data is displayed is always constant.

  A pulse shown by a broken line is a timing at which black data is conventionally written. In this case, the display data holding time T1 is different between the upper side and the lower side of the liquid crystal panel.

  FIG. 64A shows an outline of display of a liquid crystal display device to which the present invention is applied. The display period of display data and black data is always constant.

  FIG. 64B shows an outline of display of a conventional liquid crystal display device. Since the display period of the display data and the black data changes from the center of the screen, the brightness is different between the upper side and the lower side of the screen. That is, display unevenness occurs.

  As described above, in the control method of the liquid crystal display device of the present invention, two values of display data and black data are output during one horizontal period, and impulse driving is performed. For this reason, blurring of moving images can be reduced and flicker can be prevented.

  Black data was sequentially written even during the non-scanning period. For this reason, the brightness of the display data in the liquid crystal panel A can be made uniform, and display unevenness can be prevented.

Further, the conventional data driver for generating display data can be used as it is for impulse driving.
(15th Embodiment of the control method of a liquid crystal display device)
FIG. 65 shows the operation of the control circuit 18. The configuration of the main part of the liquid crystal display device is the same as that in FIG.

  This embodiment corresponds to configurations 32 to 34. The same elements as those in FIG. 60 are denoted by the same reference numerals, and detailed description thereof will be omitted.

  The control circuit 18 shifts the voltage of black data from the center voltage (VDD / 2) of the AC power source that generates display data to the positive side and the negative side by VBL + and VBL-, respectively. Specifically, the black data is set to VBL + when the polarity selection signal POL is at a high level, and the black data is set to VBL− when the polarity selection signal POL is at a low level. Other operations are the same as those in FIG.

Also in this embodiment, the same effect as that of the fourteenth embodiment of the liquid crystal display device control method described above can be obtained. Furthermore, in this embodiment, black data can be displayed more reliably because it is AC driven.
(Sixteenth Embodiment of Control Method for Liquid Crystal Display Device)
FIG. 66 shows the operation of the control circuit 18. The configuration of the main part of the liquid crystal display device is the same as that in FIG.

  This embodiment corresponds to configurations 32 to 34. The same elements as those in FIG. 60 are denoted by the same reference numerals, and detailed description thereof will be omitted.

  The control circuit 18 shortens the display data output period by shortening the low level period of the driver output control signal LP. Since the high level period of the driver output control signal LP becomes relatively long, the black data output period becomes long. The activation periods of the gate signal Gn (DT) and the gate signal Gn (BL) are made equal. In this embodiment, the width of the gate pulse for writing the black data can be made sufficiently wide, and the black data can be written reliably.

Since the display data output period is shortened, in this embodiment, the display data is divided into left and right parts, and the display data is displayed by scanning the scanning lines for each region.
(Seventeenth Embodiment of Control Method for Liquid Crystal Display Device)
FIG. 67 shows the operation of the liquid crystal panel A. The configuration of the main part of the liquid crystal display device is the same as that in FIG.

  This embodiment corresponds to configurations 32 to 34.

  The control circuit 18 writes black data a plurality of times during one frame period. That is, black data writing is complemented. For this reason, black data can be written reliably.

  In the fourteenth embodiment of the control method for the liquid crystal display device described above, the example in which the gate signal Gn (DT) for writing display data is generated from the basic gate signal GOUT and the gate signal control signal DTGOE has been described. The basic gate signal GOUT may be used as it is as the gate signal Gn (DT) without being limited thereto. In this case, after the black data is written to the pixel electrode, the display data is overwritten, but there is no problem in display quality.

In the sixteenth embodiment of the control method of the liquid crystal display device described above, the example in which the activation periods of the gate signal Gn (DT) and the gate signal Gn (BL) are made equal is described. However, the ratio between the activation period of the gate signal Gn (DT) and the gate signal Gn (BL) can be arbitrarily set.
(Twenty-eighth embodiment of liquid crystal display device)
FIG. 68 shows an outline of a TFT drive liquid crystal display device used in this embodiment.

  This embodiment corresponds to configuration 22. The same elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  This liquid crystal display device includes a liquid crystal panel A having TFTs (not shown) and liquid crystal cells C arranged in a matrix. The liquid crystal panel A is controlled by the X driver 16 and the Y driver 14. A backlight 141 is disposed on the back surface of the liquid crystal panel A. The backlight 141 is formed by juxtaposing ten direct-type cold cathode tubes (light emitting units) in parallel along the scanning direction of the scanning lines. The X driver 16, the Y driver 14, and the backlight 141 are controlled by the control circuit 142. The driving frequency at this time is 60 Hz.

  In this embodiment, the liquid crystal panel A employs a twisted nematic (TN) type (15 inches, number of pixels 1024 × 768) with a liquid crystal layer thickness of 2.2 μm. This liquid crystal has a dielectric constant ε of −3.2, a refractive index n of 0.2007, an NI transition temperature of 70 ° C., and a response time τm of 14 ms. Impulse driving is performed by sequentially flashing the cold cathode tubes of the backlight 141. The duty ratio, which is the ratio of the lighting period in one frame period, is 10%.

  FIG. 69 shows the grounds for determining the conditions (liquid crystal response time, number of cold cathode tubes, duty ratio) employed in this embodiment.

  In general, when the change in luminance due to the transient response of the liquid crystal cell C after lighting of the light emitting portion such as a cold cathode tube exceeds 5% of the luminance (shaded portion in the figure) during the lighting period of the light emitting portion, ghost appears in the image. It is said that the occurrence or the blur of the image becomes remarkable. For this reason, when impulse driving is performed to scan the scanning line corresponding to the light emitting unit during the light extinguishing period (OFF in the figure) and start writing display data, the liquid crystal cell C that changes after the light emitting unit is turned on The change in luminance (hatched portion S in the figure) needs to be 5% or less.

  FIG. 70 shows a standard for measuring the response time of the liquid crystal.

  First, the maximum luminance of the liquid crystal is set to 100, the minimum luminance is set to 0, and voltages at which the luminance becomes 0, 25, 50, 75, and 100 are defined as V0, V25, V50, V75, and V100, respectively. The maximum value of the response time between these five voltages is the liquid crystal response time. Here, the response time measures both rising and falling. The response time is a time during which 95% of the predetermined transmittance is obtained.

  FIG. 71 shows the conditions of the response time of the liquid crystal to prevent image ghosting and blurring, the number of sections of the issuing unit (the number of cold cathode tubes), and the duty ratio. FIG. 71 shows a case where one frame time is set to 16.7 ms. By dividing the horizontal axis by the frame time T, FIG. 71 becomes a time-independent graph. In this case, even when one frame time T is different from 16.7 ms, it can be discussed by the ratio of T and τm.

  The conditions adopted in this embodiment are FIG. 71 (a). Troubles such as ghosts occur when the adopted condition is located on the lower right side of each curve. Under the conditions of this embodiment, it can be seen that no ghost is generated even if seven cold cathode tubes are used. It can also be seen that ghosting occurs when the duty ratio is 20%. When using a liquid crystal with a response time of 14 ms and a duty ratio of 20%, it is necessary to use 14 or more cold cathode tubes.

Similarly, when a liquid crystal having a response time of 11 ms is adopted and the duty ratio is 40% or more, it is necessary to use 10 or more cold cathode tubes (FIG. 71 (b)). When a liquid crystal with a response time of 8 ms is used and the duty ratio is 50% or more, it is necessary to use seven or more cold cathode tubes (FIG. 71 (c)). When using a thresholdless antiferroelectric liquid crystal with a spontaneous polarization Ps of 56pC / cm ² , a liquid crystal layer thickness of 1.5μm and a response time of 0.55ms, and a duty ratio of 80%, Must be 5 or more (FIG. 71 (d)). A larger duty ratio is advantageous in improving luminance.

As described above, in the liquid crystal display device of this embodiment, the cold cathode tube is such that the change in luminance due to the transient response of the liquid crystal cell C after the cold cathode tube is turned on is 5% or less of the luminance during the lighting period of the cold cathode tube. , The ratio of the lighting period (duty ratio) in one frame period of the cold cathode tube, and the response time of the liquid crystal cell C were determined. For this reason, it is possible to prevent image ghosting and blurring.
(Twenty-ninth embodiment of liquid crystal display device)
FIG. 72 shows an outline of a TFT drive liquid crystal display device used in this embodiment.

  This embodiment corresponds to configurations 22 and 23. The same elements as those in the twenty-eighth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  In this embodiment, a backlight mechanism is formed by the liquid crystal shutter 144 and the backlight 146 that is always lit. The liquid crystal shutter 144 has transparent electrodes made of ITO (Indium Tin Oxide) divided into nine along the scanning direction of the scanning line Gn. Nine regions 144a are formed by these transparent electrodes. One or a plurality of these regions 144a transmit light from the backlight 146, thereby forming a plurality of light emitting portions to be described later. The backlight 146 has a function of irradiating light including an ultraviolet light component. A phosphor (not shown) is applied to the inner surface of the liquid crystal panel A opposite to the liquid crystal shutter 144. By applying the phosphor, the viewing angle of the image displayed on the liquid crystal panel is increased, and the display data can be displayed with high luminance.

  FIG. 73 shows a state where the light emitting portion is formed.

  In the odd-numbered frame, two adjacent regions 144a up to the eighth are in a state of transmitting light (light emitting unit). Only one ninth region 144a is in a state of transmitting light (light emitting unit). Then, during the period of one frame, the five light emitting units blink sequentially.

  Similarly, in the even-numbered frame, only one first region 144a is in a state of transmitting light (light emitting unit). Two adjacent regions 144a from the second to the ninth are in a state of transmitting light (light emitting portion). Then, during the period of one frame, the five light emitting units blink sequentially. The position of the boundary of the light emitting unit is different between the odd frame and the even frame. By moving the boundary of the light emitting unit for each frame and impulse driving, it becomes difficult to see the boundary portion.

In this embodiment, an OCB (Optically Compensated Birefringence) type liquid crystal with a response time of 7 ms is used, and impulse driving is performed with a duty ratio of 60%.
Since this condition satisfies FIG. 71, no ghost occurs.

  As described above, also in the liquid crystal display device of this embodiment, the same effect as that of the twenty-eighth embodiment can be obtained. Furthermore, in this embodiment, since the region of the light emitting unit that is turned on at the same time changes for each frame, it is difficult to see the boundary portion of the light emitting unit.

In the above-described twenty-eighth embodiment, the example in which the TN type is adopted for the liquid crystal panel A has been described. However, the liquid crystal panel A may be a ferroelectric liquid crystal or a liquid crystal having a quick response time.
(30th Embodiment of Liquid Crystal Display Device)
FIG. 74 shows an outline of a TFT drive liquid crystal display device used in this embodiment.

  This embodiment corresponds to configurations 24 and 25. The same elements as those in the twenty-eighth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The liquid crystal display device includes a control circuit 148 and an interpolation circuit 150 that performs motion compensation. The interpolation circuit 150 receives display data supplied from the outside, performs motion compensation, and outputs prediction data to the control circuit 148. The liquid crystal panel A employs a 15-inch VA (Vertical Alignment) type. The number of pixels of the liquid crystal panel A is 1024 × 768. This liquid crystal has a dielectric constant ε of −3.8 and a refractive index n of 0.0082. The backlight 146 is formed of a cold cathode tube that repeats blinking at a duty ratio of 50%.
One frame period is 16.7 ms (60 Hz).

  FIG. 75 shows an outline of the operation and motion compensation of the liquid crystal display device.

  In this embodiment, the scanning lines Gn (n = 768) are scanned in line sequence. The backlight 146 is turned on (ON) in the first half of the period of one frame and turned off (OFF) in the second half, and impulse driving is performed. The backlight 146 is turned off when scanning the 384th and subsequent scanning lines G384 to G768. Display data written in the liquid crystal cell C corresponding to the scanning lines G384 to G768 is irradiated to the outside when the backlight 146 of the next frame is turned on. Further, the display data written by the scanning of the scanning lines G289 to G383 is irradiated to the outside only for a short period in which the backlight 146 in the frame is on.

  For this reason, in this embodiment, motion compensation is performed on display data written by scanning of the scanning lines G289 to G768 indicated by bold lines in the drawing. Actually, prediction data to be displayed at the start time of the next frame indicated by shading in the drawing is written when scanning the scanning lines G289 to G768. The prediction data is calculated by interpolation from the display data of the frame and the display data of the next frame. Display data corresponding to scanning of the scanning lines G1 to G288 is written as it is without interpolation.

  FIG. 76 shows details of the interpolation circuit 150.

  The interpolation circuit 150 includes a block division processing unit 150a, an optimal block detection unit 150b, a frame memory 150c, a motion vector calculation unit 150d, a data interpolation unit 150e, and a data synthesis unit 150f.

  The block division processing unit 150a receives current frame data corresponding to the scanning lines G289 to G768, and performs a process of partitioning the liquid crystal panel A into 16 × 16 pixel regions. Motion compensation is performed in units of these areas.

  The optimum block detection unit 150b compares the display data of the frame with the display data of the previous frame for each area, and detects which area the predetermined area in the previous frame has moved to.

  The frame memory 150c stores display data for one frame.

  The motion vector calculation unit 150d generally uses a technique called a block matching technique to calculate a motion vector for each region.

  The data interpolation unit 150e internally divides the motion vector at a predetermined ratio for each scanning line Gn to obtain prediction data. The ratio of internal division is determined according to the time from the scanning of the scanning line Gn to the lighting of the backlight in the next frame.

  The data synthesizing unit 150f synthesizes the prediction data corresponding to the scanning lines G289 to G768 and the display data corresponding to the scanning lines G1 to G288, and outputs them as frame data to be displayed.

  Then, as shown in FIG. 75, prediction data to be displayed at the start time of the next frame indicated by shading in the drawing is written when scanning the scanning lines G289 to G768. As a result, blurring of the moving image and awkward movement of the moving image can be prevented. That is, the quality of moving images can be improved.

  In the thirtieth embodiment described above, the example in which the VA type is adopted for the liquid crystal panel A has been described. The liquid crystal panel A may be an OCB type, a ferroelectric type, or an antiferroelectric type.

  In the thirtieth embodiment described above, the example in which the backlight 146 blinks and is impulse driven has been described. However, the present invention is not limited to this, and a backlight mechanism may be configured by the backlight and the liquid crystal shutter, and impulse driving may be performed by controlling the liquid crystal shutter. At this time, the liquid crystal employed in the liquid crystal shutter is preferably VA type, OCB type, ferroelectric type, or antiferroelectric type.

  In the thirtieth embodiment described above, the backlight 146 has been described as being repeatedly blinking at a duty ratio of 50%. The screen becomes darker as the duty ratio decreases, but in order to improve the quality of the moving image, the backlight 146 should repeat blinking at a duty ratio of 50% or less.

The invention described in the above embodiments is organized and the following items are disclosed.
(1) The liquid crystal display device according to Configuration 1, wherein the first pixel region and the second pixel region are partitioned in a strip shape along the scanning line direction.

In this liquid crystal display device, as shown in FIG. 1, display data and reset data are sequentially written in the first pixel region 7 and the second pixel region 8 which are partitioned in a strip shape along the scanning line direction. The area where the reset data is written is dispersed in the plurality of pixel areas 7 and 8. For this reason, blurring of the display image can be reduced, and flicker can be prevented from occurring on the display screen.
(2) The liquid crystal display device according to Configuration 1, wherein the first pixel region and the second pixel region are partitioned in a lattice shape.

  FIG. 77 is a block diagram showing an additional disclosed item (2).

In this liquid crystal display device, the first pixel region 7 and the second pixel region 8 are partitioned in a lattice pattern. Then, display data and reset data are sequentially written in the first pixel region 7 and the second pixel region 9 partitioned in a grid pattern. The area where the reset data is written is dispersed in the plurality of pixel areas 7 and 8. For this reason, blurring of the display image can be reduced, and flicker can be prevented from occurring on the display screen.
(3) The liquid crystal display device according to Configuration 2, wherein the backlight is formed of any one of a light emitting diode, a fluorescent tube, and a PDP.

In this liquid crystal display device, as shown in FIG. 2, the backlight 9 is composed of any one of a light emitting diode, a fluorescent tube, and a PDP. For this reason, a backlight can be configured according to the size of the first pixel region 7 and the second pixel region 8.
(4) In the liquid crystal display device according to Configuration 2, the backlight is configured by a fluorescent tube, and the cycle of the one frame is adjusted to the cycle of an AC signal applied to the fluorescent tube, and the luminance of the fluorescent tube The display data is written in accordance with the peak of the liquid crystal display device.

In this liquid crystal display device, the backlight is composed of a fluorescent tube. The cycle of one frame constituting one screen is matched with the cycle of the AC signal applied to the fluorescent tube. By writing the display data in accordance with the luminance peak of the fluorescent tube, the contrast ratio between the display data writing and the reset data writing is increased without specially performing on / off control of the fluorescent tube.
(5) In the liquid crystal display device according to Configuration 1, the control circuit receives the display data for two screens for each frame, and writes the reset data among the first pixel area and the first pixel. A liquid crystal display device that displays data excluding data of a two-pixel region.

In this liquid crystal display device, the control circuit receives display data for two screens for each frame. The control circuit performs display using data excluding pixel data corresponding to the first pixel area and the second pixel area in which the reset data is written out of the received display data. This eliminates the need for complicated data processing for display data. Further, it is not necessary to store part of the display data in a buffer memory or the like. Therefore, the occurrence of flicker is prevented without complicating the control circuit.
(6) In the liquid crystal display device according to Configuration 1, the control circuit receives the display data for one screen for each frame, and a part of the display data when the one of the control signals is activated. Is written in the first pixel area, and when the other of the control signals is activated, the remaining display data is written in the second pixel area.

In this liquid crystal display device, the control circuit receives display data for one screen every frame. The control circuit writes a part of the display data to the first pixel area when one of the control signals is activated, and writes the remaining display data to the second pixel area when the other of the control signals is activated. For this reason, all received data is used as display data without being discarded.
(7) In the liquid crystal display device according to Configuration 1, the liquid crystal display device includes a hold drive function that activates each control signal only once during the period of one frame and writes the display data to all the pixel electrodes. A liquid crystal display device that performs control to switch between the hold driving and the impulse driving according to a display image.

This liquid crystal display device has a hold drive function that activates each control signal only once during a period of one frame and writes display data to all pixel electrodes. The control circuit performs control to switch between hold driving and impulse driving according to the display image. For example, an optimal screen display can be performed for any image by displaying a moving image by impulse driving and displaying a still image by holding driving.
(8) In the liquid crystal display device according to (7), a backlight capable of adjusting brightness is provided on a back surface of the liquid crystal panel, and the impulse driving is performed by increasing the brightness of the backlight. Liquid crystal display device.

In this liquid crystal display device, a backlight capable of adjusting the brightness is provided on the back surface of the liquid crystal panel 3. By increasing the luminance of the backlight during impulse driving as compared with that during hold driving, variations in luminance between the hold driving and the impulse driving are reduced.
(9) In the liquid crystal display device according to (7), gamma correction is performed during the impulse drive and the hold drive, and the gamma correction during the impulse drive is steeper than the gamma correction during the hold drive. A liquid crystal display device.

In this liquid crystal display device, gamma correction is performed during impulse driving and during hold driving. During impulse driving, the number of activations of the control signal is large. For this reason, when the gamma correction at the time of impulse driving is performed more steeply than the gamma correction at the time of hold driving, the change in the amount of transmitted light of the liquid crystal cell becomes faster and the luminance can be increased.
(10) The liquid crystal display device according to Configuration 1, wherein the control circuit selects the scanning lines according to the arrangement order.

In this liquid crystal display device, the control circuit selects the scanning lines according to the arrangement order.
For this reason, the control circuit is configured without significantly changing the conventional circuit.
(11) The liquid crystal display device according to Configuration 1, wherein the control circuit selects the scanning lines in a predetermined order not related to the arrangement order.

In this liquid crystal display device, the control circuit selects the scanning lines in a predetermined order unrelated to the arrangement order. For this reason, generation | occurrence | production of a flicker is prevented more reliably.
(12) In the liquid crystal display device according to (11), the first pixel region and the second pixel region are partitioned including a plurality of the scanning lines, and the control circuit includes the first pixel region and the second pixel region. In the second pixel region, the scanning lines are selected in accordance with the arrangement order of the scanning lines.

In this liquid crystal display device, the first pixel region and the second pixel region are partitioned including a plurality of scanning lines. The control circuit selects the scanning lines in the arrangement order in the first pixel region and the second pixel region. For this reason, generation | occurrence | production of a flicker is prevented more reliably, without complicating a control circuit.
(13) A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and pixel electrodes are arranged at intersections of the signal lines and the scanning lines via switching elements. Are arranged in vertical and horizontal directions, a plurality of backlights arranged adjacent to the back surface of the liquid crystal panel along the scanning line direction, and the scanning lines are controlled and synchronized with the scanning cycle of the scanning lines. And a control circuit for controlling blinking of the backlight.

  In this liquid crystal display device, a plurality of signal lines that transmit display data and a plurality of scanning lines that transmit control signals are wired vertically and horizontally, and a switching element is interposed at an intersection of each signal line and each scanning line. A liquid crystal panel in which pixel electrodes are arranged vertically and horizontally, a plurality of backlights arranged adjacent to the back surface of the liquid crystal panel along the scanning line direction, and a control for controlling the liquid crystal panel via signal lines and scanning lines Circuit. The control circuit normally drives the liquid crystal panel without displaying a reset signal and displays data. The control circuit controls lighting and extinguishing of the plurality of backlights, and controls the scanning lines facing the backlights in response to the lighting and extinguishing. The scanning cycle of the scanning line coincides with the scanning cycle of the liquid crystal panel.

Since the control of the scanning line by the control circuit may be the same as usual, there is no cause for an increase in cost. Therefore, it is possible to realize a good moving image display by replacing only the backlight.
(14) In the liquid crystal display device according to (13), the control circuit lights the backlight opposed to the scanning line when the scanning line is not scanned, and the backlight immediately before scanning the scanning line. A liquid crystal display device characterized by turning off the light.

In this liquid crystal display device, the maximum luminance of the liquid crystal panel can be contributed to the display by turning off the illumination corresponding to the scanning line immediately before the scanning line of the liquid crystal panel is scanned.
(15) In the liquid crystal display device according to the above (13), the liquid crystal panel is partitioned into a region composed of a plurality of adjacent scanning lines,
The back panel is arranged to face each of the regions,
The control circuit turns on the opposite backlight after a predetermined time after scanning the last scanning line in each region, and turns off the backlight before scanning the first scanning line in each region. A liquid crystal display device.

In this liquid crystal display device, a backlight such as a fluorescent tube larger than the pixel can be used.
(16) In the liquid crystal display device according to (15), the control circuit sets the predetermined time to one half or more of one frame time which is a time for scanning all the scanning lines once. A characteristic liquid crystal display device.

In this liquid crystal display device, the display quality of moving images is further improved by lengthening the non-display time.
(17) The liquid crystal display device according to (13), wherein the response speed of the liquid crystal panel is faster than the predetermined time in all displayable gradations.

In this liquid crystal display device, the display quality of moving images is further improved in all gradations.
(18) The liquid crystal display device according to configuration 7, wherein each of the scattering portions is arranged in parallel on the surface of the light guide plate.

In this liquid crystal display device, each scattering portion is arranged in parallel on the surface of the light guide plate. For this reason, a scattering part can be formed easily.
(19) The liquid crystal display device according to (18), wherein each of the scattering portions is disposed on a surface of the light guide plate on the liquid crystal panel side.

In this liquid crystal display device, each scattering portion is disposed on the surface of the light guide plate on the liquid crystal panel side. The light irregularly reflected by the scattering portion is irradiated toward the outside of the light guide plate. And light is irradiated to the part which opposes an irradiation area | region (or scattering part) among liquid crystal panels. Since the boundary between adjacent irradiation regions becomes clear, impulse driving can be performed with higher visibility, and flickering can be prevented.
(20) The liquid crystal display device according to (18), wherein each of the scattering portions is disposed on a surface of the light guide plate opposite to the liquid crystal panel.

In this liquid crystal display device, each scattering portion is disposed on the surface of the light guide plate opposite to the liquid crystal panel. The light irregularly reflected by the scattering part passes through the light guide plate and is applied to the liquid crystal panel. Irradiation efficiency can be improved because a member that blocks light such as a scattering portion is not disposed on the liquid crystal panel side of the light guide plate. Further, the boundary between adjacent irradiation areas can be made inconspicuous.
(21) The liquid crystal display device according to (18), wherein the liquid crystal display device includes a plurality of the light guide plates facing each other, and the scattering portions are disposed between the light guide plates.

This liquid crystal display device includes a plurality of light guide plates facing each other. Each scattering portion is disposed between the two light guide plates. The scattering portion can be protected by sandwiching the scattering portion between the light guide plates. In addition, the light irradiation mechanism including the light guide plate and the scattering portion can be formed accurately and easily.
(22) The liquid crystal display device according to (21), wherein each of the scattering portions is further disposed on an outer surface of the both light guide plates.

In this liquid crystal display device, each scattering portion is disposed between both light guide plates and on the outer surface of both light guide plates. By forming the scattering portion with a plurality of layers, light traveling in the light guide plate can be reliably scattered.
(23) The liquid crystal display device according to configuration 7, wherein each of the scattering portions is arranged in the light guide plate so as to block the light guide direction.

In this liquid crystal display device, the scattering portion is disposed in the light guide plate while blocking the light guide direction. The light traveling in the light guide plate always passes through each scattering portion. For this reason, light can be reliably scattered.
(24) The liquid crystal display device according to (23), wherein the scattering portion is arranged perpendicular to the light guide direction.

In this liquid crystal display device, the scattering portion is arranged perpendicular to the light guide direction.
For this reason, when arrange | positioning a scattering part obstruct | occluded the light guide direction, a light guide plate and a scattering part can be easily joined with high precision.
(25) The liquid crystal display device according to (23), wherein the scattering portion is disposed obliquely with respect to the light guide direction.

In this liquid crystal display device, the scattering portion is disposed obliquely with respect to the light guide direction.
For this reason, a large amount of light scattered by the scattering portion is irradiated in a direction perpendicular to the light guide direction, that is, toward the liquid crystal panel.
(26) The liquid crystal display device according to configuration 7, wherein the scattering portion is formed of a polymer-dispersed liquid crystal film.

In this liquid crystal display device, the scattering portion is formed of a polymer-dispersed liquid crystal film. For this reason, a scattering part can be constituted easily. Moreover, light scattering can be easily controlled by controlling the electric field applied to the scattering portion.
(27) The liquid crystal display device according to the above (26), wherein the resin layer covering the low-molecular liquid crystal in the liquid crystal film is composed of a polymer liquid crystal.

In this liquid crystal display device, the resin layer covering the low molecular liquid crystal in the liquid crystal film is composed of a polymer liquid crystal. For this reason, when the scattering part is in a state of transmitting light, scattering that occurs at the interface between the low-molecular liquid crystal and the resin layer can be prevented.
(28) In the liquid crystal display device according to (27), the low-molecular liquid crystal and the high-molecular liquid crystal are aligned perpendicular to the liquid crystal film surface in a state where no voltage is applied. Liquid crystal display device.

In this liquid crystal display device, the low molecular liquid crystal and the polymer liquid crystal are aligned perpendicular to the liquid crystal film surface in a state where no voltage is applied. The liquid crystal film scatters light when an electric field is applied.
(29) In the liquid crystal display device described in (27) above,
The liquid crystal display device, wherein the low-molecular liquid crystal and the high-molecular liquid crystal are aligned perpendicular to the light guide direction in a state where no voltage is applied.

In this liquid crystal display device, the low-molecular liquid crystal and the polymer liquid crystal are aligned perpendicular to the light guide direction in a state where no voltage is applied. The liquid crystal film scatters light when an electric field is applied.
(30) The liquid crystal display device according to (28), wherein the low molecular liquid crystal has negative dielectric anisotropy.

In this liquid crystal display device, the low molecular liquid crystal has negative dielectric anisotropy. In this liquid crystal film, when an electric field is applied, the orientation of liquid crystal molecules becomes perpendicular to the electric field.
(31) In the liquid crystal display device according to Configuration 9, when the motion of the direct current component in the discrete cosine transform (DCT) exceeds the size of a block made up of a predetermined pixel matrix, the moving image is determined. The liquid crystal display device is adjusted to the light emission time corresponding to the moving image.

In this liquid crystal display device, when the motion of the direct current component in the discrete cosine transform (DCT) exceeds the size of a block composed of a predetermined pixel matrix, it is determined to be a moving image and corresponds to the moving image. The flash time is adjusted. A still image and a moving image are reliably determined using a method of discrete cosine transform widely used for motion compensation of moving images.
(32) The liquid crystal display device according to configuration 8, wherein the display brightness of the liquid crystal panel is controlled to be kept constant in conjunction with the control of the light emission time.

In this liquid crystal display device, the display brightness of the liquid crystal panel is controlled to be kept constant in conjunction with the control of the light emission time. Regardless of whether the image is a still image or a moving image, the display luminance is always maintained at a constant luminance, so that the screen is easy to see.
(33) The liquid crystal display device according to configuration 8, further comprising a backlight disposed to face the liquid crystal panel, wherein the light emission time is adjusted by flashing control of the backlight. .

In this liquid crystal display device, the light emission time is adjusted by controlling the blinking of a backlight arranged opposite to the liquid crystal panel.
(34) The liquid crystal display device according to configuration 9, further comprising a backlight disposed opposite to the liquid crystal panel, wherein the light emission time is adjusted by flashing control of the backlight. .

In this liquid crystal display device, the light emission time is adjusted by controlling the blinking of a backlight arranged opposite to the liquid crystal panel.
(35) In the liquid crystal display device according to Configuration 8, impulse driving is performed in which each scanning line is scanned twice in one frame period, and the display data and reset data are written to the pixel electrode. The liquid crystal display device is adjusted according to a display period of the display data.

In this liquid crystal display device, impulse driving is performed in which each scanning line is scanned twice during one frame period, and display data and reset data are written to the pixel electrodes. The light emission time is adjusted by the display period of the display data.
(36) In the liquid crystal display device according to configuration 9, impulse driving is performed in which each scanning line is scanned twice in one frame period, and the display data and reset data are written to the pixel electrode. The liquid crystal display device is adjusted according to a display period of the display data.

In this liquid crystal display device, impulse driving is performed in which each scanning line is scanned twice during one frame period, and display data and reset data are written to the pixel electrodes. The light emission time is adjusted by the display period of the display data.
(37) The liquid crystal display device according to configuration 8, further comprising a shutter disposed to face the liquid crystal panel, wherein the light emission time is adjusted by opening / closing control of the shutter.

In this liquid crystal display device, the light emission time is adjusted by opening / closing control of a shutter disposed to face the liquid crystal panel.
(38) The liquid crystal display device according to configuration 9, further comprising a shutter disposed to face the liquid crystal panel, wherein the light emission time is adjusted by opening / closing control of the shutter.

In this liquid crystal display device, the light emission time is adjusted by opening / closing control of a shutter disposed to face the liquid crystal panel.
(39) The liquid crystal display device according to (32), further comprising a backlight disposed to face the liquid crystal panel, wherein the display luminance is controlled by adjusting the luminance of the backlight. Liquid crystal display device.

In this liquid crystal display device, the display luminance is controlled by adjusting the luminance of a backlight arranged opposite to the liquid crystal panel.
(40) In the liquid crystal display device described in (32) above,
The liquid crystal display device according to claim 1, wherein the display luminance is controlled by adjusting a signal amount of display data written to the pixel electrode.

In this liquid crystal display device, the display luminance is controlled by adjusting the signal amount of display data written to the pixel electrode.
(41) The liquid crystal display device according to configuration 10, wherein the hold control is switched to the impulse control when a ratio of the moving image in the display data is not less than a predetermined value.

This liquid crystal display device is switched from hold control to impulse control when the ratio of moving images in the display data is greater than or equal to a predetermined value.
(42) The liquid crystal display device according to configuration 10, wherein when the display data changes over two frames or more, the moving image is determined and switched from the hold control to the impulse control. .

In this liquid crystal display device, when the display data changes over two frames or more, it is determined as a moving image and switched from hold control to impulse control.
(43) The liquid crystal display device according to structure 10, further comprising a shutter disposed to face the liquid crystal panel, wherein the impulse control is performed by opening / closing control of the shutter.

In this liquid crystal display device, impulse control is performed by opening / closing control of a shutter disposed opposite to the liquid crystal panel.
(44) In the liquid crystal display device according to Configuration 10, the impulse control is performed by scanning each scanning line twice during one frame period and writing the display data and reset data to the pixel electrode. A liquid crystal display device.

In this liquid crystal display device, impulse control is performed by scanning each scanning line twice during one frame period and writing display data and reset data to the pixel electrode.
(45) The liquid crystal display device according to configuration 10, further comprising a backlight disposed opposite to the liquid crystal panel, wherein the backlight has a higher luminance than the hold control during the impulse control. Display device.

In this liquid crystal display device, at the time of impulse control, the luminance of the backlight disposed facing the liquid crystal panel is increased from that at the time of hold control. For this reason, it becomes possible to make the brightness | luminance of a moving image the same as a still image, and it becomes easy to see a screen.
(46) In the liquid crystal display device described in the above (45), the brightness of the display image output to the outside of the liquid crystal panel is the same during the impulse control and during the hold control. apparatus.

In this liquid crystal display device, the brightness of the display image output to the outside of the liquid crystal panel is the same during the impulse control and the hold control. Regardless of whether the image is a still image or a moving image, the display luminance is always maintained at a constant luminance, so that the screen is easy to see.
(47) The liquid crystal display device according to structure 10, wherein the switching element is a polysilicon TFT.

In this liquid crystal display device, since the pixel electrode is controlled by a polysilicon TFT whose switching speed is higher than that of the amorphous silicon TFT, blurring of a moving image is reduced particularly during impulse control.
(48) In the liquid crystal display device according to Configuration 10, when a proportion of each pixel of the display image of one frame that is different from each pixel of the display image of one frame displayed previously exceeds a predetermined ratio, A liquid crystal display device characterized by determining a moving image.

In this liquid crystal display device, when the proportion of each pixel of the display image of one frame that is different from each pixel of the display image of one frame previously displayed exceeds a predetermined ratio, it is determined as a moving image, and impulse control is performed. Done.
(49) In the liquid crystal display device according to Configuration 10, motion compensation is performed by discrete cosine transform (DCT), and an average value of each DC component in one frame of the display image and one frame of the previously displayed display image is The liquid crystal display device is characterized in that a moving image is determined when the difference is greater than a predetermined value.

In this liquid crystal display device, motion compensation is performed by discrete cosine transform (DCT), and the average value of the direct-current components in one frame of the display image and the previously displayed one frame of the display image differ by a predetermined value or more. Sometimes, it is determined as a moving image, and impulse control is performed.
(50) In the liquid crystal display device according to Configuration 10, motion compensation is performed by discrete cosine transform (DCT), and when the compressed image information includes vector information indicating the motion of the image, the moving image is determined. Liquid crystal display device.

In this liquid crystal display device, motion compensation is performed by discrete cosine transform (DCT), and when the compressed image information includes vector information indicating the motion of the image, it is determined as a moving image, and impulse control is performed.
(51) The liquid crystal display device according to the structure 13, wherein the polarization separation sheet is formed using cholesteric liquid crystal.
(52) The liquid crystal display device according to the structure 13, wherein the polarization separation sheet is formed by laminating a plurality of films having different refractive indexes.
(53) The liquid crystal display device according to the thirteenth aspect, wherein the polarization separation sheet is formed using a prism array including a plurality of prisms.
(54) The liquid crystal display device according to the structure 13, wherein a refractive index of the polarization separation sheet and the liquid crystal shutter is matched with a refractive index of the light guide plate.

In this liquid crystal display device, the reflection angle can be prevented from changing at the interface between adjacent members. As a result, the light traveling in the light guide plate is prevented from exceeding the critical angle at a position other than desired.
(55) The liquid crystal display device according to configuration 16, wherein the maximum voltage applied to the capacitor section is equal to or higher than a saturation voltage.

In this liquid crystal display device, display data is displayed with higher luminance.
(56) The liquid crystal display device according to the structure 17, wherein the auxiliary capacitor portion is formed using amorphous silicon.
(57) The liquid crystal display device according to the structure 17, wherein the auxiliary capacitance portion is formed using a composite material of silicon carbide and silicon nitride.
(58) The liquid crystal display device according to configuration 16, further comprising a luminance correction circuit for adjusting an applied voltage for each pixel in order to make the luminance distribution of the liquid crystal panel uniform.

In this liquid crystal display device, it is possible to prevent uneven brightness due to manufacturing errors of the auxiliary capacitor.
(59) The liquid crystal display device according to configuration 19, wherein the liquid crystal mode of the liquid crystal panel is normally black.
(60) The liquid crystal display device according to structure 21, wherein the electrode to which a voltage corresponding to the reset data is supplied is formed along the signal line.
(61) The liquid crystal display device according to structure 21, wherein the electrode to which a voltage corresponding to the reset data is supplied is formed along the scanning line.
(62) The liquid crystal display device according to configuration 21, further comprising a plurality of backlights arranged facing the liquid crystal panel and partitioned in a scanning direction of the scanning lines, the backlights for writing the display data A liquid crystal display device, wherein the liquid crystal display device is turned on correspondingly and turned off in response to the writing of the reset data.

In this liquid crystal display device, display data can be displayed with high luminance and black data can be displayed in black.
(63) The liquid crystal display device according to the structure 22, wherein a phosphor layer is formed on a side opposite to the backlight mechanism of the liquid crystal panel.

In this liquid crystal display device, the amount of light applied to the phosphor layer is adjusted according to the voltage applied to the liquid crystal cell. As a result, the viewing angle is increased and display data is displayed with high luminance.
(64) The liquid crystal display device according to structure 23, wherein the phosphor layer is formed inside the liquid crystal panel.
(65) In the method of controlling a liquid crystal display device according to Configuration 27, the backlight is configured by a fluorescent tube, and the period of the one frame is matched with the period of an AC signal applied to the fluorescent tube. A method for controlling a liquid crystal display device, wherein the display data is written in accordance with a luminance peak.

In this liquid crystal display device control method, the period of one frame constituting one screen is matched with the period of the AC signal applied to the fluorescent tube. By writing the display data in accordance with the luminance peak of the fluorescent tube, the contrast ratio between the display data writing and the reset data writing is increased without specially performing on / off control of the fluorescent tube.
(66) In the method of controlling a liquid crystal display device according to Configuration 26, the first pixel region and the second pixel that receive the display data for two screens for each frame and write the reset data among the display data A method for controlling a liquid crystal display device, characterized in that data in a region is discarded.

In this liquid crystal display device control method, display data for two screens is received for each frame. Of the received display data, the pixel data corresponding to the first pixel area and the second pixel area in which the reset data is written is discarded. This eliminates the need for complicated data processing for display data. Further, it is not necessary to store part of the display data in a buffer memory or the like. Therefore, occurrence of flicker is prevented without complicating the control.
(67) In the method of controlling a liquid crystal display device according to Configuration 26, the display data for one screen is received for each frame, and a part of the display data is received when the one of the control signals is activated. A control method for a liquid crystal display device, wherein the remaining display data is written to the second pixel region when writing to the first pixel region and the other activation of each control signal is performed.

In this liquid crystal display device control method, display data for one screen is received for each frame. When one of the control signals is activated, part of the display data is written in the first pixel area, and when the other control signal is activated, the remaining display data is written in the second pixel area. For this reason, all received data is used as display data without being discarded.
(68) In the method of controlling a liquid crystal display device according to configuration 26, the display device includes a hold driving function that activates each control signal only once during the period of one frame and writes the display data to all the pixel electrodes. A control method for a liquid crystal display device, wherein control for switching between the hold drive and the impulse drive is performed according to an image.

This liquid crystal display device control method has a hold drive function that activates each control signal only once during a period of one frame and writes display data to all pixel electrodes. Then, control for switching between hold driving and impulse driving is performed according to the display image. For example, an optimal screen display can be performed for any image by displaying a moving image by impulse driving and displaying a still image by holding driving.
(69) In the method of controlling a liquid crystal display device according to the above (68), the luminance of a backlight with adjustable brightness provided on the back surface of the liquid crystal panel is increased during the impulse driving. Control method.

In this liquid crystal display device control method, the luminance variation of the backlight is increased during the impulse drive compared to the hold drive, thereby reducing variations in luminance between the hold drive and the impulse drive.
(70) In the control method of the liquid crystal display device according to (68), gamma correction is performed at the time of the impulse drive and the hold drive, and the gamma correction at the time of the impulse drive is sharper than the gamma correction at the time of the hold drive. A method for controlling a liquid crystal display device, characterized in that:

In this liquid crystal display device control method, gamma correction is performed during impulse driving and hold driving, respectively. During impulse driving, the number of activations of the control signal is large. For this reason, when the gamma correction at the time of impulse driving is performed more steeply than the gamma correction at the time of hold driving, the change in the amount of transmitted light of the liquid crystal cell becomes faster and the luminance can be increased.
(71) The method for controlling a liquid crystal display device according to the constitution 26, wherein the scanning lines are selected in the arrangement order to control the liquid crystal panel.

In this liquid crystal display device control method, since the scanning lines are selected according to the arrangement order, the scanning lines can be easily controlled.
(72) The liquid crystal display device control method according to configuration 26, wherein the scanning lines are selected in a predetermined order not related to the arrangement order, and the liquid crystal panel is controlled.

In this liquid crystal display device control method, the scanning lines are selected in a predetermined order that is not related to the arrangement order. For this reason, generation | occurrence | production of a flicker is prevented more reliably.
(73) In the method for controlling a liquid crystal display device according to (72), the first pixel region and the second pixel region are partitioned including a plurality of the scanning lines, and the first pixel region and the second pixel region are divided. A method for controlling a liquid crystal display device, comprising: selecting a scanning line in the pixel region according to an arrangement order of the scanning lines and controlling the liquid crystal panel.

In this liquid crystal display device control method, the scanning lines are selected in the arrangement order in the first pixel region and the second pixel region. For this reason, the occurrence of flicker is more reliably prevented without complicating the control of the scanning lines.
(74) In the method of controlling a liquid crystal display device according to configuration 34, the reset data is written in the same scanning line after 1/2 frame time from the writing of the display data. Control method.
(75) In the method for controlling a liquid crystal display device according to Configuration 32, the gate driver may overwrite the display data after writing the reset data output during one horizontal period. Control method.

In this liquid crystal display device control method, the reset data is written at the beginning of one horizontal period, and then the display data is written continuously. That is, the display data is overwritten on the reset data. As a result, a gate pulse for writing display data can be easily formed.
(76) In the method for controlling a liquid crystal display device according to Configuration 32, the activation period of the timing signal is variable, and the ratio between the display data output period and the reset data output period is arbitrarily adjusted. A method for controlling a liquid crystal display device.

In this liquid crystal display device control method, the width of the gate pulse for writing the reset data can be made sufficiently wide, and the reset data can be written reliably.
(77) The control method for a liquid crystal display device according to the structure 33, wherein the reset data is written to the same scanning line a plurality of times during one frame period.

In this liquid crystal display device control method, the reset data can be written reliably.
(78) In the method for controlling a liquid crystal display device according to configuration 32, the voltage of the reset data transmitted to the signal line is a center voltage of an AC power source that generates the display data. Control method.

In this method for controlling a liquid crystal display device, for example, a conventional data driver for generating display data can be used as it is, and impulse driving can be performed.
(79) In the method for controlling a liquid crystal display device according to Configuration 32, the voltage of the reset data transmitted to the signal line is a predetermined value from the center voltage of the AC power source that generates the display data to a positive side and a negative side, respectively. A control method for a liquid crystal display device, wherein

  In this liquid crystal display device control method, the reset data can also be AC driven.

  As mentioned above, although this invention was demonstrated in detail, said embodiment and its modification are only examples of this invention, and this invention is not limited to this. Obviously, modifications can be made without departing from the scope of the present invention.

12 pixel electrode 14 Y driver 16 X driver 18 control circuit 18a data capture unit 18b data driver control unit 18c gate driver control unit 18d gate scan line determination unit 18e GOE creation unit 18f gate scan condition storage unit 18g non-scan period determination unit 18h Non-scanning period storage unit 20 First pixel region 22 Second pixel region 24 Control circuit 24a Buffer memory 26 Light guide plate 30 Control circuit 32 Control circuit 34 Hold drive circuit 36 Impulse drive circuit 38 Gamma correction table 40, 41 Control circuit 42 Liquid crystal Display device 44 Personal computer 46 Control circuit 48 A / D conversion unit 50 Video card 52 Personal computer 54 Liquid crystal display device 58 Data conversion unit 60 Liquid crystal display device 62 Control circuit 64 Data conversion unit 70 Pixel area 72 Light guide plate 74 Liquid crystal film 74a to 74e Scattering portion 76 Scattering plate 80 Light guide plate 82 Light guide plate 84 Liquid crystal film 84a to 84d Scattering portion 85a Nematic liquid crystal 85b Resin layer 86 Light guide plate 88 Backlight 90 Control circuit 92 Control circuit 94 Discrete cosine conversion portion 96 control circuit 102 light guide plate 104a, 104b polarization separation sheet 106 liquid crystal shutter 108 scattering sheet 110 phase difference sheet 112 prism sheet 112a prism 112b reflection film 114 air layer 116 scattering pattern 118 reflection plate 120 polarization separation sheet 122 display electrode 124 second pixel Electrode 126 CF substrate 128 TFT substrate 130 Liquid crystal layer 132 First pixel electrode 134 Thin film 136, 138 TFT
140 Electrode 141 Backlight 142 Control circuit 144 Liquid crystal shutter 144a Region 146 Backlight 148 Control circuit 150 Interpolation circuit 150a Block division processing section 150b Optimal block detection section 150c Frame memory 150d Motion vector calculation section 150e Data interpolation section 150f Data composition section A Liquid crystal panel
BLU backlight unit C Liquid crystal cell
D1, D2, ..., Dm signal lines
F1, F2, F3, F4 fluorescent tubes
F5 fluorescent tube
G1, G2, ..., Gn scan lines
L1, L2, L3, ..., L8 LED

Claims (27)

A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. LCD panel,
A liquid crystal display device comprising: a control circuit that performs gamma correction in response to a temperature change of the liquid crystal panel. A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. LCD panel,
A plurality of first backlights disposed on the back surface of the liquid crystal panel and spaced apart from each other; and a plurality of second backlights adjacent to the first backlight and spaced apart from each other.
The liquid crystal display device, wherein the first backlight and the second backlight blink alternately. A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. LCD panel,
A light guide plate disposed facing the liquid crystal panel;
A backlight disposed at one end of the light guide plate and supplying light along the scanning direction of the scanning line into the light guide plate;
The liquid crystal display device, wherein the light guide plate includes a plurality of irradiation regions that condense and control the introduced light and irradiate the liquid crystal panel along the scanning direction of the scanning lines. The liquid crystal display device according to claim 3.
A plurality of film-like scattering portions that totally or irregularly reflect light traveling in the light guide plate according to external control are arranged along the scanning direction of the scanning line in the light guide plate,
The liquid crystal display device, wherein the irradiation region is formed by irregular reflection of light by the scattering portion. A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. With a liquid crystal panel,
A liquid crystal display device characterized in that a light emission time which is a period for outputting a display image in a period of one frame to the outside of the liquid crystal panel is manually adjusted. A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. With a liquid crystal panel,
A light emission time which is a period for outputting a display image in a period of one frame to the outside of the liquid crystal panel is adjusted according to a speed of movement of an image displayed on the liquid crystal panel. . A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. With a liquid crystal panel,
A hold control function for outputting a display image to the outside of the liquid crystal panel during the entire period of one frame; and an impulse control function for outputting the display image to the outside of the liquid crystal panel during a predetermined period of one frame period; Have
A liquid crystal display device, wherein the hold control is performed when the display data is a still image, and the impulse control is performed when the display data is a moving image. A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and pixel electrodes are arranged through switching elements at intersections of the signal lines and the scanning lines. A liquid crystal panel composed of a plurality of control blocks divided into n (n ≧ 4) along the scanning direction of the scanning lines;
A plurality of backlights arranged to face each of the control blocks,
The liquid crystal panel scans each scanning line once in a period of one frame, performs a hold drive to write the display data to the pixel electrode,
The backlight corresponding to each control block is lit for a predetermined period immediately before scanning the scanning line in the control block,
The response time of each pixel of the liquid crystal panel is
1 frame time × (n−2) / n
A liquid crystal display device characterized by being smaller. A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and pixel electrodes are arranged through switching elements at intersections of the signal lines and the scanning lines. A liquid crystal panel composed of a plurality of control blocks divided into n (n ≧ 3) along the scanning direction of the scanning lines;
A plurality of backlights arranged to face each of the control blocks,
The liquid crystal panel scans each scanning line twice in a period of one frame, performs impulse driving to write the display data and reset data to the pixel electrode,
The backlight corresponding to each control block is lit for a predetermined period immediately before scanning the scanning line in the control block,
The response time of each pixel of the liquid crystal panel is
1 frame time × [[(n−1) / 2n] − (1 / n)] (n: odd number)
1 frame time × [[(n−2) / 2n] − (1 / n)] (n: even number)
A liquid crystal display device characterized by being smaller. A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. LCD panel,
A light guide plate disposed facing the liquid crystal panel;
A first polarization separation sheet sequentially disposed on one surface of the light guide plate, a liquid crystal shutter divided into a plurality along the scanning direction of the scanning line, a second polarization separation sheet, and a scattering sheet;
A liquid crystal display device comprising: a backlight disposed at one end of the light guide plate, and supplying light into the light guide plate along a scanning direction of the scanning lines. The liquid crystal display device according to claim 10.
A liquid crystal display device comprising a retardation sheet disposed on the other surface of the light guide plate. The liquid crystal display device according to claim 10.
The liquid crystal display device, wherein the scattering sheet is formed of a plurality of prisms. A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are vertically and horizontally wired, and a capacitance unit made of liquid crystal via a switching element at the intersection of each signal line and each scanning line Equipped with a liquid crystal panel,
The liquid crystal panel is provided with a resistor portion connected in parallel to each of the capacitor portions and having a resistance value lower than that of the capacitor portion. The liquid crystal display device according to claim 13.
The liquid crystal display device, wherein the resistance portion is formed by an auxiliary capacitance portion arranged in the liquid crystal panel. The liquid crystal display device according to claim 13.
A liquid crystal display device, wherein the liquid crystal mode of the liquid crystal panel is normally black. A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and includes a liquid crystal panel in which pixel electrodes are arranged at intersections of the signal lines and the scanning lines,
The pixel electrode is connected to a first thin film transistor and a second thin film transistor having different threshold voltages,
The liquid crystal, wherein the gate electrode of the first thin film transistor and the gate electrode of the second thin film transistor respectively connected to the pixel electrodes adjacent to each other in the scanning direction of the scanning line are connected to the same scanning line. Display device. The liquid crystal display device according to claim 16.
Each of the scanning lines is selected twice with different voltages in one frame period. The liquid crystal display device according to claim 16.
The first thin film transistor is connected to the signal line, and the second thin film transistor is connected to an electrode to which a voltage corresponding to reset data is supplied,
The liquid crystal display device, wherein a threshold voltage of the second thin film transistor is higher than a threshold voltage of the first thin film transistor. A liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are wired vertically and horizontally, and a liquid crystal cell is arranged at an intersection of each signal line and each scanning line;
A backlight mechanism having a plurality of light emitting units arranged facing the liquid crystal panel and partitioned in the scanning direction of the scanning lines,
Each of the light emitting units is turned on sequentially, the scanning line corresponding to the light emitting unit is scanned during the light extinguishing period of the light emitting unit, and impulse driving is started to start writing the display data to the liquid crystal cell,
The number of sections of the light emitting unit, the ratio of the lighting period in one frame period of the light emitting unit, and the response time of the liquid crystal cell are such that the change in luminance due to the transient response of the pixel electrode after the light emitting unit is turned on A liquid crystal display device characterized in that it is determined to be 5% or less of the luminance during the lighting period of the part. The liquid crystal display device according to claim 19, wherein
The backlight mechanism is configured by the light emitting unit whose region changes for each frame,
Each of the light emitting units includes one or a plurality of lighting mechanisms adjacent to each other.   A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. A control method for a liquid crystal display device, comprising a liquid crystal panel, and performing gamma correction in response to a temperature change of the liquid crystal panel.   A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. A liquid crystal panel, a plurality of first backlights disposed on the back surface of the liquid crystal panel and spaced apart from each other, and a plurality of second backlights adjacent to the first backlight and spaced apart from each other, A control method for a liquid crystal display device, wherein the first backlight and the second backlight are alternately blinked. A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. With a liquid crystal panel,
A method for controlling a liquid crystal display device, comprising: manually adjusting a light emission time during which a display image in a period of one frame is output to the outside of the liquid crystal panel. A plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are arranged vertically and horizontally, and pixel electrodes are arranged via switching elements at intersections of the signal lines and the scanning lines. With a liquid crystal panel,
A liquid crystal display device characterized by adjusting a light emission time which is a period for outputting a display image in a period of one frame to the outside of the liquid crystal panel according to a speed of movement of an image displayed on the liquid crystal panel. Control method. A data driver for outputting display data to a signal line during an activation period of a timing signal; a gate driver for sequentially outputting a gate pulse to a scanning line; and a switching element at an intersection of each signal line and each scanning line A liquid crystal display device comprising a liquid crystal panel having a pixel electrode disposed therebetween,
The method for controlling a liquid crystal display device, wherein the data driver outputs reset data during an inactivation period of the timing signal in one horizontal period. The method of controlling a liquid crystal display device according to claim 25,
The gate pulse is sequentially output to the scanning line to write the display data to the pixel electrode, and after a predetermined time, the gate pulse is sequentially output again to the scanning line to reset the reset data to the pixel electrode. A method for controlling a liquid crystal display device, wherein writing is performed. The method for controlling a liquid crystal display device according to claim 26,
During the non-scanning period, which is the period from the last scanning of the scanning line for writing the display data to the end of the frame, the scanning line is sequentially scanned to write the reset data, and the reset data is written to the same A control method for a liquid crystal display device, which is always performed after a predetermined time from writing of the display data in the scanning line.

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