WO2010134235A1 - 液晶表示装置およびその駆動方法 - Google Patents
液晶表示装置およびその駆動方法 Download PDFInfo
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- WO2010134235A1 WO2010134235A1 PCT/JP2010/000767 JP2010000767W WO2010134235A1 WO 2010134235 A1 WO2010134235 A1 WO 2010134235A1 JP 2010000767 W JP2010000767 W JP 2010000767W WO 2010134235 A1 WO2010134235 A1 WO 2010134235A1
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- liquid crystal
- backlight
- gradation
- crystal panel
- lighting
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0237—Switching ON and OFF the backlight within one frame
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
Definitions
- the present invention relates to a liquid crystal display device that changes luminance by blinking a backlight and changing a lighting interval, and a driving method thereof.
- an impulse-type display device such as a CRT (cathode ray tube) and a hold-type display device such as a liquid crystal display device are known.
- the impulse-type display device when attention is paid to individual pixels, a lighting period in which an image is displayed and a light-out period in which no image is displayed are alternately repeated. For example, even when a moving image is displayed, since an extinguishing period is inserted when an image for one screen is rewritten, an afterimage of an object moving in human vision does not occur. For this reason, the background and the object are clearly distinguished, and the moving image is visually recognized without a sense of incongruity.
- the hold-type display device the luminance of each pixel is held during one frame period (one vertical period) in which an image for one screen is rewritten.
- a moving image is displayed on the hold-type display device
- an afterimage of a moving object is generated in human vision.
- the outline of the moving object is visually recognized in a blurred state.
- Such a phenomenon is called, for example, moving image blur, and is considered to be caused by the followability of human eyes.
- an impulse-type display device is often used for a display such as a TV (television) that displays the moving image.
- liquid crystal display devices are characterized by thinness, light weight, and low power consumption, and in recent years, they are widely used in various fields such as TVs, monitors, mobile phones and other mobile devices in place of CRTs.
- a liquid crystal display device has a very slow response speed compared to other display devices such as a CRT.
- the display gradation in the liquid crystal display device is changed by changing the voltage applied to the liquid crystal layer to change the alignment state of the liquid crystal molecules and changing the transmittance of the display pixels.
- the response speed in the liquid crystal display device corresponds to the reciprocal of the time (response time) required for the alignment state of the liquid crystal layer to reach the alignment state corresponding to the applied voltage.
- the alignment state of the liquid crystal layer it takes some time for the alignment state of the liquid crystal layer to reach the alignment state corresponding to the applied voltage. For example, in the case of a double-speed compatible liquid crystal panel, even if rewriting is performed 120 times per second, two or more frames are required for the liquid crystal panel to react.
- overshoot driving a liquid crystal display device driving method (gradation transition emphasis processing) called overshoot driving (overdrive) has been proposed as a technique for improving the response speed of liquid crystals (see, for example, Patent Document 1). .
- OS driving is a driving method for improving the response speed by accelerating the response of the liquid crystal by applying an emphasis voltage to the liquid crystal panel.
- Such OS driving is generally realized by conversion of input gradation using a look-up table (LUT).
- LUT look-up table
- FIG. 8 is a block diagram showing a schematic configuration of a general overshoot processing circuit (hereinafter referred to as “OS processing circuit”) that performs OS driving.
- OS processing circuit a general overshoot processing circuit
- the OS processing circuit 111 includes a frame buffer 112 (frame memory), a gradation conversion unit 113, and an LUT memory 114 in which an LUT is stored.
- the LUT memory 114 stores (stores) an LUT that associates the converted gradation with the combination of the gradation before one frame (one vertical period) and the gradation of the current frame (current vertical period). Yes.
- the frame buffer 112 receives a video signal (video data signal, gradation data) from a video generation device (not shown).
- the frame buffer 112 holds the input video signal for a period of one frame (that is, until the video signal of the next frame is input). That is, the frame buffer 112 holds the video signal of the previous frame (input image one vertical period before).
- the gradation conversion unit 113 receives the video signal of the current frame from a video generation device (not shown) and the video signal of the previous frame read from the frame buffer 112.
- the gradation conversion unit 113 reads the output gradation (corrected gradation after conversion) corresponding to the video signal from the video signal of the current frame and the video signal of the previous frame from the LUT, and uses it as a liquid crystal panel drive signal. And output to a liquid crystal panel driving circuit for driving the liquid crystal panel.
- 9A and 9B show the input / output of each signal when the OS drive is not performed and when the OS drive is performed, the transmittance of the liquid crystal, the transmittance of the liquid crystal, and the lighting intensity of the backlight.
- a waveform showing the value when integrating the product of the lighting time by the lighting time (indicated as “product of backlight and liquid crystal transmittance” in the figure), and a waveform showing the actual appearance of the image on the liquid crystal panel (movie)
- “without OS” indicates a case where OS driving is not performed
- “with OS” indicates a case where OS driving is performed.
- 9A shows a timing chart when there is no OS
- FIG. 9B shows a timing chart when there is an OS.
- the liquid crystal panel driving circuit drives the liquid crystal display device based on the liquid crystal panel driving signal (driving voltage, gradation voltage) output from the OS processing circuit 111, so that FIG. As shown in FIG. 3, a strong potential difference is applied to the liquid crystal panel at the change point of the display data.
- the response speed of the liquid crystal display device can be increased as compared with the case where OS driving is not performed.
- the liquid crystal display device has a problem of moving image blur at the time of moving image display because the response method of the liquid crystal is low and the driving method is hold driving as described above.
- pseudo impulse driving that performs impulse driving in a hold type liquid crystal display device has been proposed as a technique for suppressing moving image blur caused by hold driving.
- pseudo-impulse driving a backlight extinguishing period is inserted during one frame period, and the backlight is blinked to alternately repeat a lighting period in which an image is displayed and an extinguishing period in which no image is displayed.
- the inventors of the present application tried to apply the emphasis voltage to the liquid crystal panel while combining the OS driving with the pseudo impulse driving to blink the backlight.
- a video signal is input from the video generation device 101 to the OS processing circuit 111 (see FIG. 8) of the liquid crystal display device 102, while A backlight lighting signal was input to the provided backlight 131 to cause the backlight 131 to blink.
- the inventors of the present application have found that the appearance of the image on the liquid crystal panel differs depending on the display data changing point depending on the lighting time of the backlight. This will be specifically described below.
- FIG. 11 show the difference in the actual appearance of the image on the liquid crystal panel due to the difference in backlight lighting time, the input / output of each signal, the liquid crystal transmittance, and the liquid crystal transmittance.
- Timing chart waveform diagram shown together with a waveform that shows the value when the product of the lighting intensity of the backlight and the lighting intensity of the backlight is integrated by the lighting time (in the figure, "product of backlight and liquid crystal transmittance" It is.
- the backlight blinks periodically at a predetermined time interval when displaying an image.
- the backlight is blinked at predetermined time intervals as described above, that is, when the luminance of the backlight is constant, as shown in FIG. 11A, the video signal of the current frame and the video of the previous frame are displayed.
- the value obtained by integrating the liquid crystal transmittance for the lighting time is as follows. This is because an intermediate gradation that does not exist in the original gradation can be seen at the change point of the display data.
- an object of the present invention is to provide a liquid crystal display device in which a boundary of an image can be clearly seen and a driving method thereof even when a backlight is blinked and a lighting interval is changed when displaying a moving image.
- a liquid crystal display device includes a liquid crystal panel and a backlight that irradiates light to the liquid crystal panel, and a lighting time and a lighting time of the backlight during one frame period.
- a liquid crystal display device that changes brightness by changing the lighting interval of the backlight, and sets the driving voltage intensity at the time of gradation transition to be applied to the liquid crystal panel and applies it to the liquid crystal panel
- a control circuit for controlling the driving voltage to be applied, and the control circuit is configured to control the driving voltage at the time of gradation transition applied to the liquid crystal panel under the condition that the gradation before transition and the gradation after transition are the same.
- the intensity is set to be larger as the backlight lighting time is longer.
- the liquid crystal display device driving method is a liquid crystal display device driving method including a liquid crystal panel and a backlight for irradiating the liquid crystal panel with light.
- the above-mentioned liquid crystal panel under the condition that the brightness is changed by changing the lighting interval of the backlight and the gradation before transition and the gradation after transition are the same.
- the drive voltage intensity at the time of gradation transition applied to is set to be larger as the backlight lighting time is longer.
- the strength of the driving voltage at the time of gradation transition when the evaluation criteria are the same specifically, the gradation before the transition and the transition
- the intensity of the drive voltage at the time of gradation transition applied to the liquid crystal panel under the condition that the later gradations are the same is set to be larger as the backlight lighting time is longer.
- the present invention it is possible to reduce power consumption, and when displaying a moving image, even when the luminance is changed by changing the lighting interval of the backlight, different gradations are displayed on the contour of the moving object. It is possible to reduce the appearance of the contour of the intermediate gradation (not the original gradation), and the outline of the moving object (the boundary of the image) can be clearly seen.
- FIG. 1 is a block diagram showing a schematic configuration of a liquid crystal display system according to an embodiment of the present invention. It is a block diagram which shows schematic structure of the overshoot processing circuit concerning one Embodiment of this invention.
- FIG. 3 is a diagram illustrating a state in which a plurality of lookup tables are stored in the LUT memory illustrated in FIG. 2. It is a figure which shows an example of the look-up table stored in the LUT memory shown in FIG. (A) to (c) are obtained by integrating the input / output of each signal in the liquid crystal display system shown in FIG. 1 by the liquid crystal transmittance and the product of the liquid crystal transmittance and the backlight lighting intensity by the lighting time.
- FIG. 2 is a timing chart showing a waveform indicating a value obtained by integrating the lighting time and a waveform indicating an actual appearance of an image on the liquid crystal panel, and (a) is a timing chart in the liquid crystal display system shown in FIG. (B) is a timing chart in the liquid crystal display system shown in FIG.
- (A) is a figure which shows each pixel in a liquid crystal panel, and each area in an area-divided backlight side by side
- (b) is a figure which shows the lighting time of each area in a liquid crystal panel drive signal and the said backlight. It is a figure which shows the backlight lighting signal shown side by side.
- (A) and (b) show the input / output of each signal when the overshoot drive is not performed and when the overshoot drive is performed, the liquid crystal transmittance, the liquid crystal transmittance, and the lighting intensity of the backlight.
- FIG. 6 is a timing chart showing a waveform indicating a value obtained by integrating the product of the product with the lighting time and a waveform indicating the actual appearance of the image on the liquid crystal panel
- FIG. (B) is a timing chart when overshoot driving is performed.
- It is a block diagram which shows schematic structure of the liquid crystal display system used for the measurement shown in FIG. (A) to (c) show the difference in the actual appearance of the image on the liquid crystal panel due to the difference in the lighting time of the backlight, the input / output of each signal, the liquid crystal transmittance, and the liquid crystal transmittance and the backlight.
- It is a timing chart shown with the waveform which shows the value when integrating the product with lighting intensity of this by lighting time.
- FIG. 1 is a block diagram showing a schematic configuration of a liquid crystal display system according to the present embodiment.
- the liquid crystal display system shown in FIG. 1 includes a liquid crystal display device 1 and a video generation device 2.
- the liquid crystal display device 1 shown in FIG. 1 has an overshoot processing circuit (hereinafter referred to as “OS processing circuit”) that performs gradation transition emphasis processing (hereinafter referred to as “OS driving”) called so-called overshoot driving (overdrive).
- OS processing circuit that performs gradation transition emphasis processing (hereinafter referred to as “OS driving”) called so-called overshoot driving (overdrive).
- OS driving gradation transition emphasis processing
- TCON timing control circuit
- the video generation device 2 inputs a video signal (video data signal) and a backlight lighting signal (backlight control signal) indicating backlight lighting information such as a lighting time of the backlight 15 to the liquid crystal display device 1.
- a video signal video data signal
- a backlight lighting signal backlight control signal
- Timing control circuit generates timing control signals such as clock signals and start pulses.
- the liquid crystal display device 1 operates according to this timing control signal.
- the video signal and the backlight lighting signal are input to the liquid crystal display device 1 based on the timing control signal.
- the video signal input from the video generation device 2 to the liquid crystal display device 1 is input to the OS processing circuit 11 of the liquid crystal display device 1.
- the backlight lighting signal input from the video generation device 2 to the liquid crystal display device 1 is input to the OS processing circuit 11 of the liquid crystal display device 1 and the backlight 15 through the backlight driving circuit 14 of the liquid crystal display device 1. Is input.
- the backlight 15 is provided on the back side (the side opposite to the display surface) of the liquid crystal panel 13 and irradiates the liquid crystal panel 13 with light.
- the backlight drive circuit 14 drives the backlight 15 based on a backlight lighting signal (backlight control signal) output from the video generation device 2.
- the backlight 15 includes a light source (not shown), blinks light emitted from the light source according to the backlight lighting signal, and changes (adjusts) the luminance by changing the lighting time (lighting interval).
- the liquid crystal display device 1 is pseudo-impulse driven by inserting the backlight 15 extinguishing time (extinguishing period) in one frame period by the backlight lighting signal.
- the lighting period and the non-lighting period (non-lighting period) of the backlight 15 are provided as described above, and the image display period and the black display period are formed by controlling the lighting of the backlight. Power consumption can be reduced, and moving image blurring at the time of gradation transition caused by hold driving can be suppressed.
- the light extinction period (black display period) is provided at the time of gradation transition.
- a moving image is blurred at a change point of display data at the time of moving image display, that is, by a different gradation (that is, an intermediate gradation different from the original gradation).
- the display part can be cut. As a result, the boundary of the image can be clarified.
- the backlight 15 is turned off at the time of gradation transition as much as possible, and when the lighting is turned on, the gradation is as stable as possible (that is, the light is turned off at the time of gradation transition).
- the appearance of the outline can be reduced.
- the lighting timing of the backlight 15 is controlled so as to have an extinguishing period at the time of gradation transition. Moreover, it is preferable that the lighting timing of the backlight 15 is controlled so that the backlight 15 is turned on immediately before the transmittance of the liquid crystal panel 13 changes.
- various light emitting elements such as a light emitting diode (LED), an organic electroluminescent (EL) light emitting element, an inorganic EL light emitting element, can be used, for example.
- LED light emitting diode
- EL organic electroluminescent
- inorganic EL light emitting element an inorganic EL light emitting element
- black display black insertion
- the liquid crystal display device 1 performs video display when the above-described backlight lighting signal and video signal are supplied from the video generation device 2.
- the OS processing circuit 11 sets the driving voltage strength (gradation voltage value, overshoot amount) applied to the liquid crystal panel 13 at the time of gradation transition to be applied to the liquid crystal panel 13 via the liquid crystal panel driving circuit 12. It is a control circuit for controlling the drive voltage. Specifically, the OS processing circuit 11 accelerates the response of the liquid crystal by applying an emphasized voltage to the liquid crystal panel 13 via the liquid crystal panel driving circuit 12.
- the OS processing circuit 11 performs a process (OS process) for performing OS driving on the input video signal (video data signal, gradation data).
- OS process a process for performing OS driving on the input video signal (video data signal, gradation data).
- the video signal input from the video generation device 2 to the liquid crystal display device 1 is subjected to OS processing by the OS processing circuit 11 and then input to the liquid crystal panel drive circuit 12 as a liquid crystal panel drive signal (corrected video signal).
- the liquid crystal panel drive circuit 12 drives the liquid crystal panel 13 based on the liquid crystal panel drive signal. Thereby, the liquid crystal panel 13 displays a video based on the video signal output from the video generation device 2 based on the liquid crystal panel drive signal.
- the configuration of the liquid crystal panel 13 is the same as that of a general liquid crystal panel used in a conventional liquid crystal display device, and thus detailed description and illustration thereof are omitted.
- the structure of the liquid crystal panel 13 is not specifically limited, A well-known liquid crystal panel can be applied suitably.
- the liquid crystal panel 13 includes, for example, an active matrix substrate and a counter substrate facing the active matrix substrate, and a liquid crystal layer is sealed between the pair of substrates with a sealing material.
- a CF (color filter) substrate is used as the counter substrate.
- the active matrix substrate has a structure in which a plurality of active elements such as scanning signal lines, data signal lines, and TFTs (thin film transistors) are provided. Each region surrounded by the scanning signal lines and the data signal lines is one pixel, and the liquid crystal panel 13 has a configuration in which the pixels are arranged in a matrix.
- the liquid crystal panel drive circuit 12 includes a scanning signal line drive circuit and a data signal line drive circuit (not shown).
- the scanning signal line drive circuit and the data signal line drive circuit drive the liquid crystal panel 13 in accordance with timing control signals such as a clock signal and a start pulse.
- the data signal line driving circuit drives the liquid crystal panel 13 to OS based on the liquid crystal panel driving signal (corrected video signal) output from the OS processing circuit 11.
- the temperature sensor 16 measures the temperature of the surface of the liquid crystal panel 13 and outputs the measured temperature to the OS processing circuit 11.
- the temperature sensor 16 may be installed on the surface of the liquid crystal panel 13 so as to directly measure the temperature of the panel surface, or the surface temperature of the liquid crystal panel 13 so as to indirectly measure the temperature of the panel surface.
- the temperature of the liquid crystal panel 13 may be detected based on the temperature that is installed at a location where the correlation can be obtained and measured at the location.
- the temperature sensor 16 includes an A / D (analog / digital) converter (not shown), converts an analog signal corresponding to the detected temperature into a digital signal, and outputs the digital signal.
- a / D analog / digital
- the OS processing circuit 11 receives the video signal and the backlight lighting signal from the video generation device 2 and the surface temperature data of the liquid crystal panel 13 from the temperature sensor 16. .
- the OS processing circuit 11 applies an OS to the video signal (original video data signal) input from the video generation device 2 based on the video signal, the backlight lighting signal, and preferably the surface temperature of the liquid crystal panel 13. After performing data conversion (OS processing) for driving, the data is output to the liquid crystal panel drive circuit 12 as a liquid crystal panel drive signal.
- OS processing data conversion
- the OS processing circuit 11 changes the OS driving intensity (overshoot amount) of the liquid crystal panel 13 in accordance with the lighting time of the backlight 15, so that the contour of the moving object can be seen with different gradations. To alleviate.
- the OS processing circuit 11 may acquire the temperature of the panel surface from the temperature sensor 16 as needed, and the temperature of the panel surface from the temperature sensor 16 based on the backlight lighting signal input from the video generation device 2. May be obtained.
- the OS processing circuit 11 may acquire the backlight lighting signal directly from the video generation device 2 or may acquire the backlight lighting signal via the backlight driving circuit 14.
- FIG. 2 is a block diagram showing a schematic configuration of the OS processing circuit 11 according to the present embodiment.
- the OS processing circuit 11 shown in FIG. 2 includes a frame buffer 21 (memory), a calculation unit 31 (drive voltage setting unit), and an LUT memory 41 (storage unit).
- the frame buffer 21 is a frame memory that temporarily stores video data of the previous frame.
- the frame buffer 21 holds the input video signal for a period of one frame (that is, until the video signal of the next frame is input). That is, the frame buffer 21 holds the video signal of the previous frame (input image one vertical period before).
- an LUT (look-up table, which changes the drive voltage intensity (OS intensity, overshoot amount) at the time of gradation transition by the OS drive of the liquid crystal panel 13 in accordance with the lighting time of the backlight 15.
- a plurality of conversion tables are stored (stored).
- FIG. 3 is a diagram illustrating a state in which a plurality of LUTs having different degrees of gradation change due to gradation conversion are stored in the LUT memory 41
- FIG. 4 illustrates an example of the LUT stored in the LUT memory 41.
- the LUT memory 41 is provided with a plurality of LUTs corresponding to the lighting time of the backlight 15 and the surface temperature of the liquid crystal panel 13.
- each LUT stored in the LUT memory 41 includes a combination of a current frame video signal (second-stage video input signal gradation) and a previous frame video signal (first-stage video input signal gradation).
- the driving voltage intensity (OS intensity) at the time of gradation transition by OS driving of the liquid crystal panel 13 is an output gradation (corrected gradation) corresponding to the gradation voltage value (driving voltage) input to the liquid crystal panel 13. ).
- gradations between input gradations shown in the LUT are interpolated from output gradations obtained by the LUT from previous and subsequent input gradations to determine output gradations.
- the As a result, the size of the LUT can be reduced.
- the LUT memory 41 needs to store a plurality of LUTs.
- the LUT memory 41 is preferably a magnetic disk device such as an HDD or an EEPROM that is a semiconductor memory, which keeps data even when the power is turned off.
- the calculation unit 31 includes an LUT selection unit 32 (first calculation unit) and a gradation conversion unit 33 (second calculation unit).
- the LUT selection unit 32 When the backlight lighting signal is input from the video generation device 2 to the LUT selection unit 32 and the surface temperature data of the liquid crystal panel 13 is input from the temperature sensor 16, the LUT selection unit 32 enters the LUT memory 41. One LUT is selected from a plurality of stored LUTs based on the backlight lighting time and the surface temperature of the liquid crystal panel 13, and is output to the gradation conversion unit 33.
- the gradation conversion unit 33 receives the current frame video signal (second-stage video input signal gradation) from the video generation device 2 and also reads the previous-frame video signal (first-stage video input signal) read from the frame buffer 21. Gradation) is input.
- the gradation conversion unit 33 uses the LUT selected by the LUT selection unit 32 as an input value (input gradation) as the subsequent stage video input signal gradation and the previous stage video input signal gradation, and outputs an output floor for OS driving. Determine the tone (correction tone).
- the gradation conversion unit 33 outputs the output gradation (correction gradation) to the liquid crystal panel drive circuit 12 shown in FIG. 1 as a liquid crystal panel drive signal.
- the LUT stored in the LUT memory 41 is set so that the OS intensity increases as the lighting time of the backlight 15 increases.
- the LUT is set so that the OS intensity increases as the surface temperature of the liquid crystal panel 13 decreases.
- the LUT stores several gradation transitions and gradation conversion data at the surface temperature of the liquid crystal panel 13 in the gradation transition range (0 to 255 gradations in the case of 8 bits).
- This gradation conversion data has a role of adjusting the response speed of the liquid crystal panel 13.
- the gradation conversion data indicates the strength of the OS.
- a response speed of 8.3 ms or less is obtained regardless of how the gradation transition or the surface temperature of the liquid crystal panel changes. Necessary.
- the response speed of the liquid crystal panel becomes a response speed of 8.3 ms or more depending on the gradation transition range and the surface temperature of the liquid crystal panel. Therefore, it is necessary to increase the response speed of the liquid crystal.
- the response speed can be rapidly increased by giving a strong potential difference.
- the data that gives this potential difference is the gradation conversion data.
- This gradation conversion data is acquired by actually measuring several gradation transitions and the surface temperature of the liquid crystal panel 13 in the gradation transition range of the liquid crystal panel 13 (0 to 255 gradations if 8 bits). Stored in the LUT.
- the gradation conversion data based on the gradation transition and the surface temperature other than those stored in the LUT are generated by proportional calculation.
- the role of the OS data is combined with the lighting timing of the backlight 15, thereby moving the image blur by providing a non-lighting section of the backlight 15 (for example, an LED backlight using an LED as a light source). It is possible to reduce the adverse effect of (pseudo contour).
- moving image blur (pseudo contour) can be reduced by changing the response speed of the liquid crystal with respect to the lighting / non-lighting rate of the backlight 15.
- 5A to 5C show the relationship between the lighting time of the backlight 15 according to this embodiment and the OS intensity.
- 5A to 5C show the input / output of each signal in the liquid crystal display system shown in FIG. 1, the liquid crystal transmittance, and the product of the liquid crystal transmittance and the lighting intensity of the backlight 15 in terms of lighting time.
- a waveform indicating a value when integrated in the figure, indicated as “product of backlight and liquid crystal transmittance”
- a waveform indicating an actual appearance of an image on the liquid crystal panel 13 It is a timing chart (waveform diagram) shown together with (contour).
- the driving voltage intensity at the time of gradation transition when the evaluation criteria are the same that is, under the condition that the gradation A before transition and the gradation B after transition are the same.
- the intensity of the drive voltage at the time of gradation transition applied to the liquid crystal panel is set to be larger as the lighting time of the backlight 15 is longer. More preferably, by detecting the surface temperature of the liquid crystal panel 13, the gradation before transition and the gradation after transition are the same, and the detected temperature is applied to the liquid crystal panel 13 under the same conditions.
- the intensity of the drive voltage at the time of gradation transition is set to be larger as the lighting time of the backlight 15 is longer.
- 6 (a) and 6 (b) show input / output of each signal, liquid crystal transmittance, liquid crystal transmittance and backlight lighting in the liquid crystal display system shown in FIG. 1 and the liquid crystal display system shown in FIG. Waveform indicating the value when the product of intensity is integrated by lighting time (in the figure, indicated as "product of backlight and liquid crystal transmittance"), waveform indicating the actual appearance of the image on the liquid crystal panel (movie) The outline of the moving object in the display) is shown side by side.
- 6A shows a timing chart in the liquid crystal display system shown in FIG. 1
- FIG. 6B shows a timing chart in the liquid crystal display system shown in FIG.
- the liquid crystal display system shown in FIG. The contours of different tones cannot be seen, and the contours of the moving body look beautiful. For this reason, according to the present invention, the outline of a moving object is not visually recognized in a blurred state, and moving image blur does not occur during moving image display.
- the transmittance of the liquid crystal 15 can be changed according to the lighting time of the backlight 15.
- An optimal liquid crystal panel drive signal can be generated by providing an LUT that changes the intensity of OS drive according to the lighting time. In other words, the above-described problem can be solved only by increasing the LUT to be referred to according to the lighting time of the backlight 15.
- an LUT is provided for each combination of the lighting time of the backlight 15 and the surface temperature of the liquid crystal panel 13, and the LUT selection unit 32 selects the backlight lighting time and the liquid crystal panel.
- the case where the LUT is selected based on the surface temperature of 13 has been described as an example.
- the present invention is not limited to this, and an LUT is provided for each backlight lighting time (non-lighting rate), and the LUT selection unit 32 is based only on the backlight lighting time (non-lighting rate).
- the LUT may be selected.
- the optimum OS processing is executed even if the surface temperature of the liquid crystal panel 13 changes. be able to.
- the gradation conversion in the calculation unit 31 may calculate the output gradation by calculating with a calculation formula in accordance with the lighting time of the backlight 15 without using the LUT.
- the LUT memory 41 can be removed from the configuration, or the capacity can be reduced.
- the calculation unit 31 calculates a non-lighting rate from, for example, the lighting time of the backlight 15, and a driving voltage at the time of gradation transition applied to the liquid crystal panel 13 based on the calculated non-lighting rate. You may set the intensity.
- the calculation unit 31 replaces the LUT selection unit 32 and the gradation conversion unit 33 with the surface temperature of the liquid crystal panel 13 detected by the temperature sensor 16 and the lighting time (or non-lighting rate) of the backlight 15.
- it may be configured to include an LUT update unit that calculates an overshoot parameter and updates the LUT. Thereby, the size of the LUT can be reduced, and the capacity of the LUT memory 41 can be reduced.
- the lighting rate of the backlight 15 (how the backlight is illuminated) is determined by the video generation device 2. For this reason, the non-lighting rate of the backlight 15 is automatically determined by the video generation device 2.
- the non-lighting rate is determined automatically.
- the intensity of the drive voltage at the time of gradation transition applied to the liquid crystal panel 13 is determined by the calculation unit 31 based on the illumination method of the backlight 15 determined by the video generation device. Switching may be performed, for example, by selecting an LUT based on how it is illuminated.
- the calculation unit 31 integrates the product of the liquid crystal transmittance and the backlight lighting intensity with the lighting time, It is desirable to adjust (set) the strength of the driving voltage at the time of gradation transition of the liquid crystal panel 13 so that the boundary can be clearly seen and has a desired density. That is, it is desirable that the calculation unit 31 sets the strength of the drive voltage at the time of gradation transition applied to the liquid crystal panel 13 so that the outline of the different gradation is not visible on the outline of the moving object in the moving image.
- moving image blur (pseudo contour) can be reduced by bringing the backlight 15 close to being lit at a stable location before and after the gradation transition. That is, the reduction of the moving image blur (pseudo contour) adjusts the gradation density.
- the adjustment of the gradation density (that is, reduction of the moving image blur) can be performed by changing the response speed of the liquid crystal with respect to the lighting / non-lighting rate of the backlight 15.
- the liquid crystal display device 1 corresponds to a liquid crystal display module
- the video generation device 2 corresponds to a CPU (central processing unit) such as a PC.
- this invention is not limited to this, For example, it can apply to various articles
- FIG. 1 illustrates the case where the video generation device 2 is provided separately from the liquid crystal display device 1, but the video generation device 2 is provided outside the liquid crystal display device 1 as shown in FIG. Alternatively, it may be provided inside the liquid crystal display device 1. That is, the liquid crystal display device according to the present invention may include a video generation device (video generation circuit).
- the OS processing circuit 11 can be partly or wholly incorporated into LSI together with other circuits, and these LSI parts can be formed on the liquid crystal panel 13. Further, part or all of the circuit portions such as the liquid crystal panel drive circuit 12 and the backlight drive circuit 14 can be implemented as LSIs, and these circuit units are formed on the liquid crystal panel 13. It is also possible. Also, the video generation device 2 may be implemented as an LSI, and may be provided in the liquid crystal display device 1 as described above.
- This technology can be applied to both the normally black method and the normally white method.
- the present technology can be applied to the case where the backlight 15 is divided into a plurality of blocks (areas) and the lighting times are different for each block.
- FIG. 7A is a diagram showing each pixel in the liquid crystal panel 13 and each area (block) in the backlight 15 divided into areas
- FIG. 7B is a diagram showing the liquid crystal panel drive signal and It is a figure which shows side by side the backlight lighting signal which shows the lighting time of each area in the said backlight 15.
- FIG. 7A is a diagram showing each pixel in the liquid crystal panel 13 and each area (block) in the backlight 15 divided into areas
- FIG. 7B is a diagram showing the liquid crystal panel drive signal and It is a figure which shows side by side the backlight lighting signal which shows the lighting time of each area in the said backlight 15.
- FIG. 7A is a diagram showing each pixel in the liquid crystal panel 13 and each area (block) in the backlight 15 divided into areas
- FIG. 7B is a diagram showing the liquid crystal panel drive signal and It is a figure which shows side by side the backlight lighting signal which shows the lighting time of each area in the said backlight 15.
- FIG. 7A is a diagram showing each
- illumination regions a plurality of regions for emitting illumination light (hereinafter referred to as “illumination regions”) are provided, and each of the lighting regions is provided according to an image displayed on a liquid crystal panel.
- area active backlights that individually control the brightness (brightness) of illumination are attracting attention.
- the area active backlight does not illuminate the entire surface uniformly, but controls the lighting timing and lighting time of the illumination light for each illumination area according to display data.
- the brightness of each illumination light emitted from each illumination area of the backlight divided into a plurality of areas is individually controlled, and each of the corresponding liquid crystal panels An image is displayed by irradiating an area (hereinafter referred to as “display area”).
- the liquid crystal panel 13 can be appropriately driven.
- the OS processing in the OS processing circuit 11 may be performed using the LUT, or may be performed by calculation using a calculation formula without using the LUT.
- the calculation unit 31 calculates how each display area or each pixel of the liquid crystal panel 13 is illuminated by the backlight divided into areas as described above, for example, as a non-lighting rate. Then, the intensity of the driving voltage at the time of gradation transition of the liquid crystal panel 13 may be switched based on how the target display area or pixel is illuminated. Thereby, even if the lighting time of the backlight 15 or the surface temperature of the liquid crystal panel 13 is changed in each display area corresponding to each illumination area, it is possible to execute optimum OS driving.
- the OS processing circuit 11 and the OS processing in the OS processing circuit 11 may be configured by hardware logic, or may be realized by software using a CPU (Central Processing Unit).
- CPU Central Processing Unit
- the liquid crystal display device 1 includes a CPU that executes instructions of a control program for realizing each function in the OS processing circuit 11, a ROM (read only memory) that stores the program, and a RAM (random access) that expands the program. Memory), a storage device (recording medium) such as a memory for storing the program and various data, and the like.
- a recording medium in which a program code of a control program for realizing each function described above is recorded so as to be readable by a computer is supplied to the liquid crystal display device 1 and recorded by the computer or CPU or MPU (microprocessor). This can also be achieved by reading and executing the program code recorded on the medium.
- Examples of the recording medium include a tape system such as a magnetic tape and a cassette tape, a magnetic disk such as a floppy (registered trademark) disk / hard disk, and a compact disk-ROM / MO / MD / digital video disk / compact disk-R.
- the liquid crystal display device 1 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network.
- the communication network is not particularly limited.
- the Internet intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available.
- the transmission medium constituting the communication network is not particularly limited.
- infrared rays such as IrDA and remote control, Bluetooth ( (Registered Trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used.
- the present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.
- the liquid crystal display device includes a liquid crystal panel and a backlight that irradiates the liquid crystal panel with light, and has a lighting time and a light-off time of the backlight during one frame period.
- a liquid crystal display device that changes brightness by changing a lighting interval of the backlight, and sets a driving voltage intensity at the time of gradation transition applied to the liquid crystal panel and applies the driving voltage to the liquid crystal panel.
- the control circuit controls the intensity of the driving voltage at the time of gradation transition applied to the liquid crystal panel under the condition that the gradation before transition and the gradation after transition are the same. The larger the backlight lighting time, the larger the setting.
- the liquid crystal display device driving method is a liquid crystal display device driving method including a liquid crystal panel and a backlight for irradiating the liquid crystal panel with light.
- the above-mentioned liquid crystal panel under the condition that the brightness is changed by changing the lighting interval of the backlight and the gradation before transition and the gradation after transition are the same.
- the intensity of the drive voltage at the time of gradation transition applied to is set to be larger as the backlight lighting time is longer.
- the emphasis voltage is applied to the liquid crystal panel as described above, so that the contour of the moving body has a different floor. It is possible to reduce the appearance of the tone outline.
- control circuit sets the intensity of the driving voltage applied to the liquid crystal panel at the time of the gradation transition so that the contour of the different gradation is not visible on the contour of the moving object in the moving image.
- the backlight is divided into a plurality of regions, the brightness of each region is individually controlled, and the control circuit drives the gradation transition applied to the liquid crystal panel.
- the intensity of the voltage is preferably set for each area corresponding to each area of the backlight in the liquid crystal panel according to the lighting time of the backlight in each area.
- the luminance can be controlled for each divided area of the backlight according to the image displayed on the liquid crystal panel. And in each area
- control circuit includes a memory for temporarily storing the gradation data of the previous frame, the gradation data of the current frame, the gradation data of the previous frame read from the memory, and the back Based on the lighting time of the light, the intensity of the driving voltage applied to the liquid crystal panel at the time of gradation transition is set.
- control circuit performs gradation transition emphasis processing based on the backlight lighting time, and applies the gradation applied to the liquid crystal panel under the condition that the gradation before transition and the gradation after transition are the same.
- the intensity of the driving voltage at the time of the tone transition is increased as the backlight lighting time is increased to change the transmittance of the liquid crystal. For this reason, the actual appearance of the image at the change point of the display data can be made constant regardless of the lighting time of the backlight.
- the control circuit performs gradation conversion for performing gradation transition enhancement processing from gradation data of the current frame and gradation data of the previous frame read from the memory, and performs gradation transition enhancement processing.
- the intensity of the drive voltage at the time of the gradation transition applied to the liquid crystal panel may be set by performing the gradation conversion using a lookup table that varies depending on the lighting time of the backlight. .
- control circuit includes a storage unit in which a plurality of lookup tables having different degrees of gradation change due to the gradation conversion are stored, and one lookup table among the lookup tables.
- a selection unit that selects, and a gradation conversion unit that performs the gradation conversion using the lookup table selected by the selection unit, wherein the selection unit is configured to store the storage unit based on a backlight lighting time.
- One lookup table corresponding to the lighting time of the backlight may be selected from a plurality of lookup tables stored in the.
- control circuit calculates a non-lighting rate from the lighting time of the backlight, and sets the intensity of the driving voltage at the time of the gradation transition applied to the liquid crystal panel based on the calculated non-lighting rate It may be.
- the liquid crystal panel according to the backlight lighting time is set.
- the driving voltage intensity at the time of gradation transition can be set in a short time, and an inexpensive configuration can be achieved.
- the storage means for storing the lookup table is removed from the configuration. Or the capacity can be reduced.
- the lighting timing of the backlight is controlled so as to have an extinguishing period at the time of gradation transition.
- the lighting timing of the backlight is controlled so that the backlight is turned on immediately before the transmittance of the liquid crystal panel changes.
- the backlight is constantly lit at the time of gradation transition, the outline of a different gradation cannot be seen on the outline of the moving object.
- the light-off period is provided as in the present invention, when a backlight lighting period and a light-off period are provided at the time of gradation transition, contours of different gradations can be seen on the contour of the moving body. For this reason, it is possible to reduce the appearance of different contours on the contour of the moving body by providing a backlight extinguishing period as much as possible at the time of gradation transition and by making the gradation as stable as possible at the time of lighting.
- the liquid crystal display device further includes a temperature sensor that detects a surface temperature of the liquid crystal panel, and the control circuit further applies the gradation applied to the liquid crystal panel according to the temperature detected by the temperature sensor. It is preferable to set the strength of the driving voltage at the time of transition.
- control circuit backs up the intensity of the driving voltage applied to the liquid crystal panel when the gradation before transition and the gradation after transition are the same and the temperature is the same. It is preferable to set larger as the lighting time of the light is longer.
- the control circuit preferably sets the intensity of the driving voltage applied to the liquid crystal panel at the time of gradation transition to be larger as the temperature is lower.
- control circuit further sets the intensity of the driving voltage at the time of the gradation transition applied to the liquid crystal panel as described above according to the temperature detected by the temperature sensor.
- the strength of the driving voltage at the time of gradation transition can be set to an optimum value.
- the liquid crystal display device can reduce the appearance of contours of different gradations (intermediate gradations that are not in the original gradations) on the contours of moving objects when displaying moving images. Therefore, it is possible to suppress the deterioration of the display quality of the moving image due to the occurrence of an afterimage on the display screen. Therefore, the present invention can be suitably used for liquid crystal display devices and driving methods thereof in a wide range of fields such as TVs, monitors, mobile phones, navigation devices, and portable game machines.
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Abstract
Description
2 映像生成装置
11 OS処理回路(制御回路)
12 液晶パネル駆動回路
13 液晶パネル
14 バックライト駆動回路
15 バックライト
16 温度センサ
21 フレームバッファ(メモリ)
31 演算部
32 LUT選択部(選択部)
33 階調変換部
41 LUTメモリ(記憶手段)
Claims (13)
- 液晶パネルと、上記液晶パネルに光を照射するバックライトとを備え、1フレーム期間中に上記バックライトの点灯時間と消灯時間とを有し、上記バックライトの点灯間隔を変更することで輝度を変更する液晶表示装置であって、
上記液晶パネルに印加する階調遷移時の駆動電圧の強度を設定して上記液晶パネルに印加する駆動電圧を制御する制御回路を備え、
上記制御回路は、遷移前の階調および遷移後の階調がそれぞれ同じになる条件下での上記液晶パネルに印加する階調遷移時の駆動電圧の強度を、バックライトの点灯時間が長いほど大きく設定することを特徴とする液晶表示装置。 - 上記バックライトは複数の領域に分割されており、各領域の輝度が個別に制御されているとともに、
上記制御回路は、上記液晶パネルに印加する上記階調遷移時の駆動電圧の強度を、上記各領域のバックライトの点灯時間に応じて、上記液晶パネルにおける、上記バックライトの各領域に対応する領域毎に設定することを特徴とする請求項1記載の液晶表示装置。 - 上記制御回路は、
1フレーム前の階調データを一時的に記憶するメモリを備え、
現フレームの階調データと、上記メモリから読み出した1フレーム前の階調データと、バックライトの点灯時間とに基づいて上記液晶パネルに印加する上記階調遷移時の駆動電圧の強度を設定することを特徴とする請求項1または2記載の液晶表示装置。 - 上記制御回路は、現フレームの階調データと、上記メモリから読み出した1フレーム前の階調データとから階調遷移強調処理を行うための階調変換を行うとともに、階調遷移強調処理を行うための階調変換を、バックライトの点灯時間によって異なるルックアップテーブルを用いて実施することで、上記液晶パネルに印加する上記階調遷移時の駆動電圧の強度を設定すること特徴とする請求項3記載の液晶表示装置。
- 上記制御回路は、
上記階調変換による階調変化度合いが互いに異なる複数のルックアップテーブルが記憶されている記憶部と、
上記ルックアップテーブルの中から1つのルックアップテーブルを選択する選択部と、
上記選択部で選択されたルックアップテーブルを用いて上記階調変換を行う階調変換部とを備え、
上記選択部は、バックライトの点灯時間に基づいて、上記記憶部に記憶されている複数のルックアップテーブルの中から、バックライトの点灯時間に応じた1つのルックアップテーブルを選択することを特徴とする請求項4記載の液晶表示装置。 - 上記バックライトは、階調遷移時に消灯期間を有するようにその点灯タイミングが制御されていることを特徴とする請求項1~5の何れか1項に記載の液晶表示装置。
- 上記バックライトは、上記液晶パネルの透過率が変化する直前に点灯するようにその点灯タイミングが制御されていることを特徴とする請求項1~6の何れか1項に記載の液晶表示装置。
- 上記制御回路は、動画像における移動体の輪郭に異なる階調の輪郭が見えなくなるように上記液晶パネルに印加する上記階調遷移時の駆動電圧の強度を設定することを特徴とする請求項1~7の何れか1項に記載の液晶表示装置。
- 上記制御回路は、バックライトの点灯時間から非点灯率を算出し、この算出された非点灯率に基づいて上記液晶パネルに印加する上記階調遷移時の駆動電圧の強度を設定することを特徴とする請求項1~3の何れか1項に記載の液晶表示装置。
- 上記液晶パネルの表面温度を検出する温度センサをさらに備え、
上記制御回路は、さらに、上記温度センサで検出された温度に応じて上記液晶パネルに印加する上記階調遷移時の駆動電圧の強度を設定することを特徴とする請求項1~9の何れか1項に記載の液晶表示装置。 - 上記制御回路は、遷移前の階調および遷移後の階調がそれぞれ同じでかつ上記温度が同じ条件下での上記液晶パネルに印加する上記階調遷移時の駆動電圧の強度を、バックライトの点灯時間が長いほど大きく設定することを特徴とする請求項10記載の液晶表示装置。
- 上記制御回路は、上記液晶パネルに印加する上記階調遷移時の駆動電圧の強度を、上記温度が低いほど大きく設定することを特徴とする請求項10記載の液晶表示装置。
- 液晶パネルと、上記液晶パネルに光を照射するバックライトとを備えた液晶表示装置の駆動方法であって、
1フレーム期間中に上記バックライトの点灯時間と消灯時間とを設け、上記バックライトの点灯間隔を変更することで輝度を変更するとともに、遷移前の階調および遷移後の階調がそれぞれ同じになる条件下での上記液晶パネルに印加する階調遷移時の駆動電圧の強度を、バックライトの点灯時間が長いほど大きく設定することを特徴とする液晶表示装置の駆動方法。
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Also Published As
Publication number | Publication date |
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EP2434474A1 (en) | 2012-03-28 |
EP2434474A4 (en) | 2013-03-27 |
US20110267383A1 (en) | 2011-11-03 |
JPWO2010134235A1 (ja) | 2012-11-08 |
RU2011129350A (ru) | 2013-06-27 |
CN102272820A (zh) | 2011-12-07 |
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