JP2003108102A - Driving method for liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device which can be used for display of high picture quality for a long time and its driving method by dividing a gate circuit and synchronizing it with a light source. SOLUTION: Gate driving circuits 5 and 6 are divided into a plurality of parts. A liquid crystal display part is equipped with a color time-division incidence optical system, which is so shaped that data line groups extending from the data driving circuits 1 and 2 are electrically separated on two opposite sides of a display area and the gate driving circuits 5 and 6 are divided into other two opposite sides and so arranged that light beams of different chromaticity are made incident on the display area one after another, and a synchronization part which synchronizes the liquid crystal display part with the color time- division incidence optical system under a specific condition; when the light source illuminate the entire surface of a panel at a time, the gate driving circuit blocks are scanned at the same time and when the light source illuminates the panel while scanning it, the gate driving circuit blocks are scanned one after another and synchronized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving a liquid crystal display device, and more particularly, to a method for driving a liquid crystal display device which has a substantially long period of use for display.

[0002]

2. Description of the Related Art At present, most of liquid crystal display elements are of a twisted nematic (TN) type. This TN type liquid crystal display device uses a nematic liquid crystal composition and can be roughly classified into two types.
One of them is an active matrix method in which a switching element is provided in each pixel, and for example, a thin film transistor (TFT: Thin Film) is used in a TN display method.
Transistor (TN-TFT)
Method) is known. The other one is STN (Super
r Twisted Nematic) method. The STN method is improved in contrast and viewing angle dependency as compared with the conventional simple matrix method using the TN type, but is slow in response speed and is not suitable for displaying moving images. Further, there is a drawback that the display quality is lower than that of the active matrix system using the TFT.
As a result, the TN-TFT method is now the mainstream of the market.

On the other hand, due to the demand for higher image quality, methods for improving the viewing angle have been researched and developed and have been put to practical use.
As a result, the current mainstream of high-performance liquid crystal displays is T
A method using a compensation film for N mode, or in-plane switching (IPS: In Plane)
Switching mode, or multi-domain vertical alignment (MVA: Multi D)
3 of the active matrix liquid crystal display device of the TFT type of the main Vertica1 Aligned) mode
It has become a kind. In these active matrix liquid crystal display devices, an image signal is normally rewritten at 60 Hz because positive / negative writing is performed at 30 Hz, and one field time is about 16.7 ms (milliseconds) (when both positive and negative fields are combined). Obituary is called 1 frame and is about 3
3.3 ms). On the other hand, the response speed of the current liquid crystal is about this frame time even in the fastest state.
Therefore, a response speed faster than the current frame time is required when displaying a video signal composed of a moving image, when displaying a high-speed computer image, or when displaying a high-speed game image.

On the other hand, in order to further improve the definition, a field sequential (time division) color liquid crystal display device in which the backlight, which is the illumination light of the liquid crystal display device, is temporally switched among red, green and blue is also considered. ing. In this method, since it is not necessary to spatially arrange the color filters, it is possible to achieve a resolution three times higher than the conventional one. In the field sequential liquid crystal display device, 1/3 of one field
Since it is necessary to display one color in the time of, the time available for display is about 5 ms. Therefore, the liquid crystal itself
It is required to respond faster than 5 ms. As a liquid crystal capable of realizing such a high speed response, a wave crystal having spontaneous polarization such as a ferroelectric liquid crystal or an antiferroelectric liquid crystal has been studied. Also in the nematic liquid crystal, by increasing the dielectric anisotropy, lowering the viscosity, thinning the film, changing the liquid crystal orientation to a pie-type orientation, or devising the drive voltage waveform, Speeding up is under consideration.

Here, in the active matrix liquid crystal display element, the time when the voltage and the charge are actually written in the liquid crystal portion is only the selection time (writing time) of each scanning line.
This time is 16.7 μs (microseconds) when writing normally in 1 field time with 1000 lines, and is about 5 μs particularly when field sequential driving is performed. At present, there is almost no liquid crystal or liquid crystal use mode in which the response ends within this time. Even in the above-mentioned liquid crystal having spontaneous polarization and the nematic liquid crystal which has been sped up, there is no known element that exhibits such a quick response. As a result, the liquid crystal responds after the signal writing is completed, and the following problems occur. First,
In a liquid crystal having spontaneous polarization, a counter electric field is generated due to the rotation of the spontaneous polarization, and the voltage across the liquid crystal layer drops sharply. Therefore, the voltage written on both ends of the liquid crystal layer changes greatly. On the other hand, even in the high-speed nematic liquid crystal, the capacitance change of the liquid crystal layer due to the anisotropy of the dielectric constant becomes extremely large, so that the holding voltage to be written and held in the liquid crystal layer changes. Such a reduction in the holding voltage, that is, a reduction in the effective applied voltage reduces the contrast due to insufficient writing. Further, when the same signal is continuously written, the luminance continues to change until the holding voltage does not decrease, and it takes several frames to obtain stable luminance.

[0006] Furthermore, Japanese Applied Physics Vol. 36, Part 1 No. 2 pp. 720-
As shown on page 729, a phenomenon called "step response" is observed when the same image signal is continuously written for several frames from the frame in which the image signal changes and the absolute value of the signal voltage changes. This phenomenon is caused by the same amplitude AC
This is a phenomenon in which the transmittance vibrates brightly and darkly for several frames with respect to the driving signal voltage, and after that, the amount of transmitted light becomes stable. An example of this phenomenon is schematically shown in FIG. Figure 2
4A is a waveform diagram of the data voltage, FIG. 24B is a waveform diagram of the gate voltage, and FIG. 24C is a waveform diagram of the transmittance at that time. The transmittance is stable after a step response during AC driving. The transmittance when stable is shown by a two-dot silver line, and the transmittance at the darkest time is shown by a one-dot silver line.

Further, FIG. 25 is a timing chart for each scanning line in the driving of FIG. 24, and the shading of the positive display period 102 and the negative display period 104 is the luminance based on the transmittance of FIG. 24 (c). Is schematically shown. Also, 1 in the figure
The field time of 16.7 ms is shown by an arrow. In this figure, six scanning lines are assumed, and positive writing 101 is sequentially performed from the upper scanning line to display the positive display 10.
After 2 is obtained, negative writing 1 is sequentially performed again from the upper scanning line.
03 to obtain a negative display 104. For each scan line,
The first field is obtained by adding the period of positive writing 101 and the period of positive display 102, and the second field is obtained by adding the period of negative writing 103 and the period of negative display 104.
The total of both fields is one frame. Now, FIG. 24
When the data voltage of (a) is applied and the TFT switch is turned on by the gate voltage of FIG. 24 (b), the transmittance vibrates bright and dark for each field as shown in FIG. 24 (c). Such vibration of the transmittance is observed as flicker, which causes deterioration of display quality. In addition, in this figure, 2
At the frame (4 fields), the transmittance has settled down to a certain level. As a result, the brightness change also vibrates as shown in FIG. As described above, even if a high-speed response liquid crystal is used, it takes several frames to stabilize the actual brightness, and thus the high speed of the displayed image is lost.

On the other hand, in active matrix driving, the transmittance after liquid crystal response is determined not by the applied signal voltage but by the amount of charge stored in the liquid crystal capacitance after liquid crystal response. This is because the active drive is a constant charge drive in which the liquid crystal responds with the held charge. The amount of charge supplied from the active element is determined by the accumulated charge before the predetermined signal writing and the newly written write charge, ignoring a minute leak or the like. In addition, the accumulated charge after the liquid crystal responds also changes depending on the painter design values such as the physical constants and electrical parameters of the liquid crystal and the storage capacitance. Therefore, in order to obtain the correspondence between the signal voltage and the transmittance, information for calculating (1) the correspondence between the signal voltage and the write charge, (2) the accumulated charge before the writing, and (3) the accumulated charge after the response is obtained. And actual calculation is required. As a result, a frame memory for storing (2) over the entire screen and a calculation unit for (1) or (3) are required. This leads to an increase in the number of parts of the system and is not preferable.

As a method for solving these problems, a reset pulse method is often used in which a reset voltage for applying a predetermined liquid crystal state is applied before writing new data. As an example, IDR 1
The technique described on pages L-66 to L-69 of 997 will be described. In this document, an OCB (Optical Compensated Birefligence) mode in which a compensating film is added to a nematic liquid crystal having a pie orientation is used. The response speed of this liquid crystal mode is about 2 to 5 milliseconds, which is significantly faster than that of the conventional TN mode. As a result, the response should originally end within one frame, but as described above, it takes several frames until a stable transmittance is obtained because the holding voltage is drastically reduced due to the change in the dielectric constant due to the response of the liquid crystal. It costs. Therefore, FIG. 26 (FIG. 5 of the above document) shows a method of writing black display after writing white display in one frame. The horizontal axis represents time and the vertical axis represents luminance. The dotted line shows the luminance change in the case of normal driving, and the stable luminance is reached in the third frame. According to the reset pulse method, since a predetermined state is always established when new data is written, there is a one-to-one correspondence of a constant transmittance with respect to the written constant signal voltage. This one-to-one correspondence makes it very easy to generate a drive signal, and at the same time eliminates the need for a frame memory or other means for storing the previous write information.

As another method of applying a reset voltage, positive and negative data signal voltages are generated for a constant image signal, positive (negative) is applied, and then negative (positive) is applied.
After that, a method of applying a reset voltage is used. In this case, if the positive and negative data signal voltages having the same amplitude are simply applied, the above-mentioned "step response" occurs. Therefore, the data signal voltage as shown in FIGS. 27 and 28 is applied.

FIG. 27 is a waveform diagram of data pressure, and FIG. 28 is a waveform diagram of transmittance at that time. The waveforms shown by the dotted lines in the figure are the waveform of the data voltage having the same amplitude and the waveform of the transmittance when the voltage is applied. In these figures, for simplification, the data voltage is shown by subtracting the common voltage (actually, the common voltage corresponds to the 0 volt voltage position in the figures). To prevent "step response", set the amplitude of the data voltage at the beginning of the frame (here, the positive data voltage) to a low value, and set the amplitude of the data voltage at the latter half of the frame (here, the negative data voltage) to the dotted waveform. The same shall apply. This blocks the step response, as shown in FIG.
The same transmittance can be obtained in the first half and the second half of the frame. After that, by resetting at the end of the frame, the liquid crystal state is always aligned to a predetermined reset liquid crystal state. In the next frame, by applying a similar waveform anew, there is a one-to-one correspondence of constant transmittance with respect to constant signal voltage.
Further, here, the reset voltage is set to 0 volt with respect to the common voltage, but this depends on the liquid crystal display mode and a predetermined state to be realized by reset.

Further, these reset driving methods are roughly classified into two types depending on the timing of resetting each scanning line in the field. That is, a method of resetting all the scanning lines on the entire surface of the panel at one time (hereinafter referred to as entire surface batch reset) and a method of performing a diset while scanning each scanning line or a scanning line block in which a plurality of scanning lines are collected as in the scanning writing. Method (hereinafter, scan reset). A full-screen batch reset can also be regarded as a scan reset in which all scan lines are in the same block at the time of reset (However, in this concept, reset scanning does not occur, so scan reset and full-screen batch reset are classified separately). .

29 and 30 show timing charts for each scanning line in each reset method. FIG. 29 is a timing chart for each scanning line in the all-in-one batch reset, and FIG. 30 is a timing chart for each scanning line in the scanning reset. The horizontal axis represents time and the vertical axis represents the scanning line direction. The write period, the response period, the display period, and the reset period are shown. 29 and 30, writing is performed while sequentially scanning the scanning lines (here, from top to bottom) in the writing period. The writing period (abbreviated as Tw as necessary) is a time tw required for writing each scanning line.
Is multiplied by the number of scanning lines n, and Tw = n × t
w. After that, there is a response period (abbreviated to Tm as necessary) until the response of the liquid crystal is almost stable. next,
A display-only period (abbreviated to Td as necessary) continues until the response of the liquid crystal is stabilized and reset is started. When the reset starts, a big difference occurs between FIG. 29 and FIG. That is, in the all-in-one batch reset of FIG. 29, all the scanning lines are reset at the same time. The reset period (abbreviated as Tr as necessary) is the sum of the time required for writing reset and the time required for the liquid crystal to settle into a predetermined state. on the other hand,
In the scan reset of FIG. 30, scan lines are sequentially scanned and reset. As a result, in the scan reset method of FIG.
The reset period Tr and the writing period Tw substantially overlap each other. As described above, the scan reset method has less waste in time allocation.

As another means for solving these problems such as step response, a driving method called "pseudo DC driving", which is shown on pages 119 to 122 of the digest of AMC ID 97, has been proposed. This technique will be described with reference to FIG. 31 is similar to FIG. 24, FIG. 31 (a) is a waveform diagram of the data voltage, and FIG. 31 (b).
Is a waveform diagram of the gate voltage, and FIG. 31C is a waveform diagram of the transmittance at that time. Further, FIG. 32 is a timing chart for each scanning line, showing the positive and negative display periods 102 and 104.
The shading indicates the luminance based on the transmittance shown in FIG.

Further, in FIG. 32, a time of 16.7 ms is indicated by an arrow. In the description in the literature, 16.7 ms is defined as one frame time, but since this definition is not general, it is changed in the figures in this specification (the one frame time described in the literature is It corresponds to one field time in the book as compared with the conventional technique). "Pseudo DC
In the “drive”, unlike the normal AC drive shown in FIG. 24,
The data voltage of the same sign is continuously applied during a plurality of fields. After a plurality of fields, the sign of the data voltage is inverted to eliminate electrical bias. In FIG. 31, after the positive writing of 4 fields, the negative writing of 4 fields is performed, and the display of one image signal ends. The write timing for each scanning line is as shown in FIG. 32. Positive data is sequentially written from the top, repeated four times, and then negative data is sequentially written from the top four times.
With this method, a state can be obtained in which the constant DC voltage applied is the same as the holding voltage across the liquid crystal. As a result, there is no decrease in the holding voltage due to the response of the liquid crystal, and A in FIG.
The final transmittance is higher than that in the C driving method in which the holding voltage is lowered by the response of the liquid crystal. However, one frame time in this method is the total of a plurality of frames of each code. That is, in the example of FIG. 31, one frame time of this method is four times as long as that of the frame of FIG.

Further, a technique is known in which a light source is turned on and off on a daily basis different from field sequential. This makes video support daily. This is a display system in which the brightness is rapidly reduced after the high brightness due to the characteristics of the phosphor like a CRT is classified as an impulse type, and a case where the brightness is held within one field period as in a liquid crystal display device is classified as a hold type. This is based on the analysis result of the display characteristics in the case of doing. Such an analysis is shown on pages 1 to 6 of the proceedings of the seminar “LCD goes into the CRT monitor market-from the viewpoint of moving image display ...” held by the LCD Forum of the Liquid Crystal Society of Japan. . As a result of the analysis, in order to display a good moving image with the hold type, it is not enough to improve the response speed of the liquid crystal, and there is a problem caused by the hold type operation system itself that the display light is held. It is pointed out that there is. To improve this, (1)
There are two possible methods: shortening the hold time of the display light, and (2) arranging the display light at a screen position that follows the movement of the image as much as possible. As a method of shortening the hold time in (1), pages 20 to 23 of the same proceedings show that a high-speed LC using a π-cell structure using a compensator is disclosed.
The technique in which the backlight light source is displayed by blinking at D is shown. In addition, a technique for shortening the hold time by inserting a reset state in which the backlight light source is constantly turned on is also described.

[0017]

The pseudo DC drive described above requires a longer frame time (four times as long as the AC drive in FIGS. 31 and 32) as compared with the AC drive, and high speed response is indispensable. In addition, as a result, a normal frame time (16.7 ms) as shown by the brightness in FIG.
A long-period flicker that oscillates at several times is generated. As a result, there is a problem in that it is difficult to display a moving image.

Further, in the method of comparing the accumulated charges before and after the writing, as described above, the comparison operation unit and the like are required in addition to the frame memory, which causes a problem of increasing the system.

Further, in the reset method, in one field period, a writing period, a response period (time until the response stabilizes after writing), a reset period (time to settle in a constant state by writing reset and resetting). )
And so on. The period that can be substantially used for display is the time obtained by excluding these periods from one field time. As a result, the reset pulse method has a problem that the time available for display is shortened by the reset period.

Further, there is a problem that the scanning period is shortened by the reset period. Usually, the scanning period (writing time) is approximately equal to the field time, which is half the frame time, divided by the number of scanning lines. However, if a reset period is provided during the field time, FIG.
As described above, the scanning period is the field time minus the reset time divided by the number of scan lines. As a result, the reset shortens the scanning period. A method of combining interlace drive and reset in order to prevent the reset period from affecting the scanning period is disclosed in, for example, Japanese Patent Laid-Open No. 4-186217. In this method, the FLC (ferroelectric liquid crystal) panel is driven in the interlace mode, and the scanning line in the non-display period is reset. As a result, the reduction of the scanning period due to the provision of the reset period can be slightly prevented. Further, it is considered that the flicker is reduced by the averaging because the reset cycles of the adjacent lines are shifted. However, this method also has a problem that the time available for display is shortened by the reset period.

Such a decrease in the display period is particularly serious in the field sequential display, and it is extremely difficult to secure the brightness.

Further, the reset may cause uneven brightness on the panel surface. Measures against this point can be slightly improved by the technique described in Japanese Patent Application No. 10-041689.

Therefore, an object of the present invention is to provide a driving method of a liquid crystal display device, which can substantially be used for display for a long time in order to solve the above problems.

Another object of the present invention is to provide a method of driving a liquid crystal display device having a high light utilization rate.

Still another object of the present invention is to provide a driving method of a liquid crystal display device which can be easily linked with a light source.

Still another object of the present invention is to provide a method of driving a liquid crystal display device in which the method of driving the liquid crystal display section and the method of lighting the optical system are synchronized.

[0027]

In order to achieve the above object, the present invention provides a data driving circuit provided along both sides of two opposite sides of a rectangular display area and another two sides opposite to each other. A liquid crystal display section provided with a gate drive circuit, a color time division incidence optical system arranged so that light with different chromaticities is sequentially incident on the display area, a liquid crystal display section and a color time division incidence optical system. And a synchronization unit that synchronizes under predetermined conditions,
The gate drive circuit of the liquid crystal display unit is formed by being divided into a plurality of parts, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method for driving a liquid crystal display device, wherein the color time-division incidence optical system collectively turns on the blocks of each gate drive circuit at different timings from other gate drive circuits. A method for driving a device is provided.

In order to achieve the above object, the present invention provides a data driving circuit provided along both sides of two opposite sides of a rectangular display area and a gate driving circuit provided along another two opposite sides. A liquid crystal display unit including a circuit, a bright and dark blinking incident optical system arranged to enter blinking light sandwiching a dark state for a certain time in the display region, a liquid crystal display unit and a bright and dark blinking incident optical system under predetermined conditions. With a synchronization unit that synchronizes with
The gate drive circuit of the liquid crystal display unit is formed by being divided into a plurality of parts, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method for driving a liquid crystal display device, wherein a bright / dark blinking incident optical system collectively turns on the inside of each gate drive circuit at a different timing from other gate drive circuits. To provide a driving method.

To achieve the above object, the present invention provides a data driving circuit provided along both sides of two opposite sides of a rectangular display area, and a gate driving provided along another two opposite sides. A liquid crystal display unit with a circuit, a color time-division incident optical system arranged so that light with different chromaticity is sequentially incident on the display area, and the liquid crystal display unit and the color time-division incident optical system are synchronized under predetermined conditions. And a gate drive circuit of the liquid crystal display unit is divided into a plurality of parts, and
Each data line group extending from each of the data drive circuits is
A method of driving a liquid crystal display device which is electrically separated in each of a plurality of divided gate drive circuits, wherein each color time division incidence optical system has a timing different from that of other gate drive circuits. Provided is a method for driving a liquid crystal display device, which is characterized in that a block of a drive circuit is turned on while scanning.

To achieve the above object, the present invention provides a data drive circuit provided along both sides of two opposite sides of a rectangular display area and a gate drive provided along another two opposite sides. A liquid crystal display unit including a circuit, a bright and dark blinking incident optical system arranged to enter blinking light sandwiching a dark state for a certain time in the display region, a liquid crystal display unit and a bright and dark blinking incident optical system under predetermined conditions. With a synchronization unit that synchronizes with
The gate drive circuit of the liquid crystal display unit is formed by being divided into a plurality of parts, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method for driving a liquid crystal display device, wherein a bright and dark blinking incident optical system illuminates while scanning a block of each gate drive circuit at a timing different from other gate drive circuits. To provide a driving method.

To achieve the above object, the present invention provides a data driving circuit provided along both sides of two opposite sides of a rectangular display area and a gate driving circuit provided along another two opposite sides. A liquid crystal display unit with a circuit, a color time-division incident optical system arranged so that light with different chromaticity is sequentially incident on the display area, and the liquid crystal display unit and the color time-division incident optical system are synchronized under predetermined conditions. And a gate drive circuit of the liquid crystal display unit is divided into a plurality of parts, and
Each data line group extending from each of the data drive circuits is
A method of driving a liquid crystal display device which is electrically separated in each of a plurality of divided gate driving circuits, wherein each of the gate driving circuits performs reset while scanning and scanning of one gate driving circuit. After the end of, the other gate drive circuits start writing, and the color time-division incidence optical system collectively turns on in the block of each gate drive circuit at a different timing from the other gate drive circuits.
The scanning timing performed by each of the gate drive circuits by the synchronization unit,
Provided is a method for driving a liquid crystal display device, characterized in that scanning of scanning lines and timing of incidence of a light source are synchronized with each other on the basis of rising characteristics of luminance of a light source and occurrence of display unevenness on a panel surface.

In order to achieve the above object, the present invention provides a data driving circuit provided along both sides of two opposite sides of a rectangular display area and a gate driving provided along another two opposite sides. A liquid crystal display unit including a circuit, a bright and dark blinking incident optical system arranged to enter blinking light sandwiching a dark state for a certain time in the display region, a liquid crystal display unit and a bright and dark blinking incident optical system under predetermined conditions. With a synchronization unit that synchronizes with
The gate drive circuit of the liquid crystal display unit is formed by being divided into a plurality of parts, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method of driving a liquid crystal display device, wherein each of the gate drive circuits resets while scanning, and after the scanning of one gate drive circuit is completed, another gate drive circuit starts writing to change the brightness. The blinking incident optical system collectively illuminates the inside of each gate drive circuit block at a different timing from the other gate drive circuits, and the synchronizing part performs scanning timing by each of the gate drive circuits and the rising characteristics of the brightness of the light source, And driving of a liquid crystal display device, characterized in that the scanning of the scanning lines and the incident timing of the light source are synchronized based on the occurrence of display unevenness on the panel surface. The law provides.

To achieve the above object, the present invention provides a data driving circuit provided along both sides of two opposite sides of a rectangular display area and a gate driving circuit provided along another two opposite sides. A liquid crystal display unit with a circuit, a color time-division incident optical system arranged so that light with different chromaticity is sequentially incident on the display area, and the liquid crystal display unit and the color time-division incident optical system are synchronized under predetermined conditions. And a gate drive circuit of the liquid crystal display unit is divided into a plurality of parts, and
Each data line group extending from each of the data drive circuits is
A method of driving a liquid crystal display device which is electrically separated in each of a plurality of divided gate driving circuits, wherein each of the gate driving circuits performs reset while scanning and scanning of one gate driving circuit. After that, the other gate drive circuits start writing, and the color time-division incidence optical system turns on while scanning the blocks of each gate drive circuit at a different timing from the other gate drive circuits, Is characterized in that the scanning of the scanning lines and the incident timing of the light source are synchronized based on the scanning timing performed by each of the gate driving circuits, the rising characteristic of the luminance of the light source, and the occurrence of display unevenness on the panel surface. A method for driving a liquid crystal display device is provided.

In order to achieve the above object, the present invention provides a data driving circuit provided along both sides of two opposite sides of a rectangular display area and a gate driving circuit provided along another two opposite sides. A liquid crystal display unit including a circuit, a bright and dark blinking incident optical system arranged to enter blinking light sandwiching a dark state for a certain time in the display region, a liquid crystal display unit and a bright and dark blinking incident optical system under predetermined conditions. With a synchronization unit that synchronizes with
The gate drive circuit of the liquid crystal display unit is formed by being divided into a plurality of parts, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method of driving a liquid crystal display device, wherein each of the gate drive circuits resets while scanning, and after the scanning of one gate drive circuit is completed, another gate drive circuit starts writing to change the brightness. The blinking incident optical system illuminates while scanning the blocks of each gate driving circuit at a timing different from that of the other gate driving circuits, and the synchronizing portion performs scanning timing performed by each of the gate driving circuits, the rising characteristics of the brightness of the light source, And a liquid crystal display device characterized in that the scanning of the scanning line and the incident timing of the light source are synchronized on the basis of the occurrence of display unevenness on the panel surface. To provide a dynamic way.

As described above, according to the liquid crystal display device of the present invention, the gate is divided, and the light source blinks in accordance with the writing and resetting operations, or the color time division is performed. Will be increased.

Further, the driving of the liquid crystal display section is selected depending on whether the lighting method of the light source is batch lighting for each block or sequential scanning lighting, so that it is possible to increase the display period and the light utilization efficiency. is there.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

First, an embodiment of the liquid crystal display device of the present invention will be described, then an embodiment of the liquid crystal display portion of the liquid crystal display device of the present invention will be described, and finally, of the liquid crystal display device of the present invention. The driving method will be described.

FIG. 1 is a block diagram showing the configuration of the first embodiment of the liquid crystal display device of the present invention. This liquid crystal display device includes a color time division incident optical system 7 and a liquid crystal display unit 8. The color time-division incidence optical system 7 is arranged to sequentially enter lights having different chromaticities into this display area. Liquid crystal display 8
The color time division incident optical system 7 is synchronized with the color time division incident optical system 7 under a predetermined condition.

FIG. 2 is a block diagram showing the configuration of the second embodiment of the liquid crystal display device of the present invention. In this liquid crystal display device, the same liquid crystal display unit 8 as that of the first embodiment of the liquid crystal display device shown in FIG. 1 and blinking light (bright and dark light) that sandwiches a dark state for a certain period are incident on a display area. A bright / dark blinking incident optical system 11 is arranged, and the liquid crystal display unit 8 and the bright / dark blinking incident optical system 11 are synchronized by a synchronizing unit 9 under a predetermined condition.

Next, an embodiment of the liquid crystal display section in the liquid crystal display device of the present invention will be described.

First, the first to sixth embodiments of the liquid crystal display section of the present invention will be described using the first embodiment of the liquid crystal display device described above, and then the liquid crystal of the present invention described above. The seventh to twelfth embodiments of the liquid crystal display unit of the present invention will be described using the second embodiment of the display device.

First, with reference to FIG. 3, a first embodiment of the liquid crystal display portion of the present invention will be described. Figure 3
FIG. 1 is a schematic diagram showing a configuration of a first embodiment of a liquid crystal display section in the present invention. The liquid crystal display section includes a display area and a drive circuit. In the first embodiment, the data drive circuits 1 and 2 are provided both above and below (or left and right) the display area of the liquid crystal display device, and each data line group 3 extending from each data drive circuit 1 and 2. 4 is electrically separated at the top and bottom (or left and right) of the display area. Further, the gate drive circuits 5 and 6 are arranged on the left or right (or on the top or bottom) of the display area in a contour that is divided into the top and bottom (or the left and right) corresponding to the top and bottom (or the left and right). Although both gate drive circuits 5 and 6 are arranged on the left side in FIG. 3, both gate drive circuits 5 and 6 may be arranged on the right side in the present embodiment.

Next, with reference to FIG. 4, a second embodiment of the liquid crystal display section of the present invention will be described. Figure 4
FIG. 6 is a schematic diagram showing a configuration of a second embodiment of a liquid crystal display unit in the present invention. In the second embodiment, as in the first embodiment, the first embodiment of the liquid crystal display device of the present invention is used.
However, in the first embodiment of the liquid crystal display section, the gate drive circuits 5 and 6 are arranged on the same side on the left or right (or on the top or bottom) of the display area. On the other hand, in the second embodiment, as shown in FIG. 4, the gate drive circuits 5a and 6a are separately arranged on one of the left side and the right side (or the upper side or the lower side) of the display area, and the gate drive circuits 5a and 6a are arranged on the other side. The drive circuits 5b and 6b are arranged separately.
The arrangement of the data drive circuits 1 and 2 is the same as that of the first embodiment. As described above, in the second embodiment, the gate drive circuits 5a, 5b, 6a, 6b are vertically (or horizontally) divided and are arranged on both the left and right (or top and bottom) sides of the display area. .

Next, with reference to FIG. 5, a third embodiment of the liquid crystal display portion of the present invention will be described. Figure 5
FIG. 6 is a schematic diagram showing the configuration of a third embodiment of a wave crystal display unit in the present invention. In the third embodiment, as in the first or second embodiment, the first embodiment of the liquid crystal display device of the present invention is used, but the data drive circuits 1 and 2 are located above and below (or The data drive circuits 1a, 1b, 2 are divided into a plurality of blocks (horizontally and vertically) horizontally (or vertically).
a and 2b. Gate drive circuits 5a, 5b, 6
a and 6b are the same as those in the second embodiment described above.
As described above, the third embodiment shown in FIG. 5 is different from the data drive circuits 1 and 2 in the second embodiment shown in FIG.
Is divided into two, and data drive circuits 1a, 1b, 2a, 2
This is an example of the case of b. Also, a larger number of divisions may be performed.

Next, with reference to FIG. 6, a fourth embodiment of the liquid crystal display portion of the present invention will be described. Figure 6
FIG. 9 is a schematic diagram showing a configuration of a liquid crystal display unit according to a fourth embodiment of the present invention. In the fourth embodiment, first to
In the third embodiment, the gate drive circuit is further divided into a large number. That is, the gate drive circuits 5a, 5b, 6a and 6b of the third embodiment are the same as the gate drive circuits 5a-1, 5a-2, 5b-1 and 5 of the fourth embodiment.
It is divided into b-2, 6a-1, 6a-2, 6b-1, 6b-2. As described above, in the fourth embodiment shown in FIG. 6, an example of a part of the liquid crystal display section when the gate drive circuit is divided into four is shown.

Next, with reference to FIGS. 7 and 8, a fifth embodiment of the liquid crystal display portion of the present invention will be described.
In the fifth embodiment, the operation in the case where active elements are arranged at all the points where the data lines and the scanning lines intersect in the above-described fourth embodiment will be considered. For example, if the timings at which the gate drive circuits 5a-1 and 5a-2 are scanned do not temporally overlap, there is no problem at all. However, if they overlap with each other in time, the data signal will be squeezed into several scanning lines. Therefore, the active element is arranged only at a predetermined selected intersection among the intersections of the data lines and the scanning lines. This is the fifth embodiment. 7 and 8 show an example in which a part of FIG. 6 is enlarged and the fifth embodiment is applied. In FIG. 7, the active elements are arranged in a checkerboard pattern,
As shown in FIG. 8, there is also a method in which a region where active elements are arranged and a region where active elements are not arranged are provided for each block. Further, the structure may be a combination of FIGS. 7 and 8. Also,
The arrangement position of the wiring may be appropriately changed so as to improve the aperture ratio.

Next, in the sixth embodiment of the liquid crystal display portion according to the present invention, in addition to the fifth embodiment, a part or all of the wiring is further embedded or provided in a bridge shape, that is, another Layer. In this case, a part may be provided in another layer, a contact may be made, and the wiring may be returned to a normal wiring layer.

Next, the seventh to twelfth embodiments of the liquid crystal display section of the present invention using the second embodiment of the liquid crystal display device of the present invention will be described.

In the seventh embodiment of the liquid crystal display unit of the present invention, the first embodiment of the liquid crystal display unit described in FIG. 3 is used by using the second embodiment of the liquid crystal display device of FIG. It realizes the same configuration as. That is, in the seventh embodiment, as shown in FIG. 3, the data drive circuits 1 and 2 are provided both above and below (or on the left and right) of the display area, and each data drive circuit 1 and 2 extends from each data drive circuit 1 and 2. The line groups 3 and 4 are electrically separated at the top and bottom (or left and right) of the display area. Further, the gate drive circuits 5 and 6 are arranged on the left or right (or above or below) of the display area in a vertically divided (or left and right) shape corresponding to the above and below (or left and right).

In the eighth embodiment of the liquid crystal display section of the present invention, the second embodiment of the liquid crystal display section described in FIG. 4 is used by using the second embodiment of the liquid crystal display device of FIG. It realizes the same configuration as. That is, in the eighth embodiment, as shown in FIG.
6 has a shape divided into upper and lower (or left and right) and is arranged on both left and right (or upper and lower) sides of the display area.

In the ninth embodiment of the liquid crystal display section of the present invention, the third embodiment of the liquid crystal display section described in FIG. 5 is used by using the second embodiment of the liquid crystal display device of FIG. It realizes the same configuration as. That is, the data drive circuit in the liquid crystal display section is above and below (or left and right).
Each is divided horizontally (or vertically) into a plurality. That is, in the ninth embodiment, as shown in FIG. 5, the data driving circuit is divided into two, and the data driving circuit is divided into 1a,
1b, 2a and 2b. Also, a larger number of divisions may be performed.

In the tenth embodiment of the liquid crystal display section of the present invention, the fourth embodiment of the liquid crystal display section described with reference to FIG. 6 is used by using the second embodiment of the liquid crystal display device of FIG. It realizes the same configuration as. That is, the seventh,
In the eighth embodiment, the gate drive circuit is further divided into a large number, and as shown in FIG. 6, the gate drive circuit is divided into four, and 5a-1, 5a-2, 5b-1, 5a are provided.
It is divided into b-2, 6a-1, 6a-2, 6b-1, 6b-2.

In the eleventh embodiment of the liquid crystal display portion of the present invention, the fifth embodiment of the liquid crystal display portion described in FIGS. 7 and 8 is used by using the second embodiment of the liquid crystal display device of FIG. The configuration similar to that of the embodiment is realized. That is,
In the eleventh embodiment, in the seventh to tenth embodiments, active elements are arranged only at selected predetermined intersections of the intersections of the data lines and the scanning lines.

In the twelfth embodiment of the liquid crystal display section of the present invention, the sixth embodiment of the liquid crystal display section described in FIGS. 7 and 8 is used by using the second embodiment of the liquid crystal display device of FIG. The same configuration as that of the above embodiment is realized. That is, in the twelfth embodiment, part or all of the wiring in the seventh to eleventh embodiments may be embedded or provided in a bridge shape, that is, may be provided in another layer.

The first to twelfth embodiments of the liquid crystal display section of the liquid crystal display device of the present invention have been described above in detail. Next, the active element of the present invention will be described. The active element of the present invention includes MIM (m
A switching element such as a diode or a TFT having an etal insulator metal) structure is considered.
In the case of a TFT, amorphous silicon (α-Si), polysilicon (poly Si), or another material may be used. Further, switching may be performed by the DRAM substrate.

Further, the driving circuit of the present invention may be manufactured separately from the glass substrate of the liquid crystal display by using single crystal silicon and connected, or may be formed on the glass substrate by polysilicon. The circuit configuration in the drive circuit is appropriately formed by a shift register, a buffer, a latch, and other circuits according to the embodiment of the following drive method.

First, before explaining an embodiment of a driving method of a liquid crystal display device of the present invention, a timing chart showing a reset mode of the driving method shown in FIGS. 9 and 10 will be described. In FIG. 9, writing of each gate drive circuit is started almost at the same time, and in FIG. 10, after scanning within a certain gate circuit is completed, the next gate circuit is scanned to enable sequential scanning over the entire panel. Details of FIGS. 9 and 10 will be described in an embodiment described later.

Next, first to twenty-ninth embodiments of the driving method of the liquid crystal display device of the present invention will be described.

In the first embodiment of the driving method of the liquid crystal display device of the present invention, when driving any one of the first to twelfth embodiments of the above-mentioned liquid crystal display section, resetting is performed by each gate drive circuit. We will do it all at once. That is, the above-mentioned entire surface collective reset is adopted for each gate drive circuit. As a matter of course, all the gate drive circuits may be reset at the same time to form a complete all-in-one reset.

In the second embodiment of the driving method of the liquid crystal display device of the present invention, the reset of each gate drive circuit of the first embodiment of the driving method is started almost at the same time, and a substantially complete whole surface collective reset is performed. It is a form.

In the third embodiment of the driving method of the liquid crystal display device of the present invention, in the first and second embodiments of the driving method, for example, FIGS.
As shown in FIG. 1) of Japanese Patent No. 41689, the scanning direction in the first field is from top to bottom (or left to right), and the scanning direction in the second field is from bottom to top (or right to left). In this way, it is possible to form the luminance distribution within the panel surface by changing the scanning direction. The reset voltage and the data voltage are not limited to those shown in FIGS. 14 and 15, and can be arbitrarily selected according to the liquid crystal display mode and the driving type. Moreover, it is also possible to apply the other method described in Japanese Patent Application No. 10-041689.

In the fourth embodiment of the driving method of the liquid crystal display device of the present invention, the writing of each scanning line in each gate driving circuit is sequentially scanned in the first to third embodiments of the driving method. By.

In the fifth embodiment of the driving method of the liquid crystal display device of the present invention, in the fourth embodiment of the driving method, the writing of each gate drive circuit is shifted for a fixed time and sequentially started. By further changing this method and after scanning in a certain gate circuit is completed, the next gate circuit is scanned to enable sequential scanning over the entire panel.

In the sixth embodiment of the driving method of the liquid crystal display device of the present invention, the writing of each gate drive circuit is started almost simultaneously in the fourth embodiment of the driving method. A timing chart of driving in this case is shown in FIG. According to this method, the display period can be extremely increased as compared with the conventional driving shown in FIG.

In the seventh embodiment of the driving method of the liquid crystal display device of the present invention, the writing of each scanning line in each gate drive circuit is fully scanned in the first to third embodiments of the driving method. Do the lines almost simultaneously. Thereby, the display period can be further increased.

In the eighth embodiment of the liquid crystal display device driving method of the present invention, resetting is performed while scanning in each gate circuit. That is, the scan reset described above is adopted for each gate drive circuit. Of course, all gate drive circuits may be sequentially reset to perform scan reset for sequentially scanning the entire surface.

In the ninth embodiment of the method of driving a liquid crystal display device of the present invention, the above-mentioned scanning is performed for each scanning line.

Tenth Method of Driving Liquid Crystal Display Device of the Present Invention
In the embodiment of the present invention, a plurality of arbitrarily selected scanning lines are set as one block, this block is simultaneously reset, and the block is arbitrarily selected and scanned.

Eleventh Method of Driving Liquid Crystal Display Device of the Present Invention
In the embodiment, the scanning method shown in Japanese Patent Publication No. 10-041689 is applied in the tenth embodiment of the driving method. For example, FIGS. 16 to 18 (Japanese Patent Application No. 10-
As shown in FIG. 3 of Japanese Patent Application No. 041689), the first scanning line group written in the first field is reset at the end of the second field, and the direction opposite to the direction of the first scanning line group in the second field is set. The second scan line group written from is reset at the end of the first field of the next frame. In this way, it is possible to relax the luminance distribution in the panel surface by changing the scanning direction. The reset voltage and the data voltage are not limited to those shown in FIGS. 17 and 18, and can be arbitrarily selected according to the liquid crystal display mode and the driving type. Furthermore, it is also possible to apply the other method described in Japanese Patent Application No. 10-041689.

The twelfth method of driving a liquid crystal display device according to the present invention
In the eighth embodiment, in each of the eighth to eleventh embodiments of the driving method, writing of each scanning line in each gate driving circuit is performed by sequential scanning.

Thirteenth method of driving a liquid crystal display device according to the present invention
In this embodiment, in the twelfth embodiment of the driving method, the writing of each gate drive circuit is shifted for a fixed time and sequentially started.

The fourteenth method of driving the liquid crystal display device of the present invention
The embodiment is a technique in which the thirteenth embodiment of the driving method is further modified, and after the scanning in a certain gate circuit is completed, the next gate circuit is scanned. This method enables sequential scanning over the entire panel. FIG. 10 shows a driving timing chart in this case. The timing chart is apparently the same as FIG. However, it is greatly different in that the gate drive circuit is divided.

Fifteenth Method of Driving Liquid Crystal Display Device of the Present Invention
In the twelfth embodiment, writing of the respective gate drive circuits is started at substantially the same time in the twelfth embodiment of the driving method.

Sixteenth method of driving liquid crystal display device according to the present invention
In the eighth embodiment, in each of the eighth to eleventh embodiments of the driving method, the writing of each scanning line in each gate driving circuit is performed at substantially the same time for all scanning lines. Thereby, the display period can be further increased.

The seventeenth method of driving the liquid crystal display device according to the present invention
In this embodiment, the optical system collectively lights the entire surface of the liquid crystal display unit.

The eighteenth method of driving a liquid crystal display device according to the present invention
In the embodiment described above, the optical system collectively turns on the inside of the block for each gate drive circuit in the liquid crystal display unit, and turns on at different timings in the other gate drive circuits.

The nineteenth method of driving the liquid crystal display device according to the present invention
The embodiment is to carry out the seventeenth or eighteenth embodiment in the first to sixteenth embodiments of the driving method.

The twentieth method of driving the liquid crystal display device according to the present invention
In particular, the first embodiment adopts the sixth or seventh embodiment of the nineteenth embodiment of the driving method.
It is a 7th and 18th embodiment. The operation of the seventeenth embodiment, which adopts the sixth embodiment of the twentieth embodiment, is as follows.

In the timing chart of FIG. 9, scanning for writing and resetting are performed. Therefore, the time used for writing and responding is significantly reduced as compared with the conventional driving shown in FIG. As a result, the period available for display is increased. When the light sources are collectively turned on over the entire display area, a display of higher brightness can be obtained in this embodiment in which the display can be used for a longer period. In this way, the utilization efficiency of light is increased. Further, since the time during which the liquid crystal can sufficiently respond and perform stable display is increasing, stable high-quality display is possible when color time division or bright / dark blinking is performed. As described above, in the collective lighting of the light sources, if the sixth embodiment is adopted, it is possible to use the light extremely efficiently. In addition, high quality display is possible. If the seventh embodiment is adopted, it is possible to further efficiently use the light for lighting the light sources all together. On the other hand, when the display period is the same time, the writing time to each scanning line can be increased, that is, the frequency of the gate drive circuit can be reduced. With both of these effects, it is possible to reduce the frequency of the gate drive circuit and increase the display period.

The twenty-first method of driving the liquid crystal display device of the present invention
In the embodiment, the optical system lights while scanning the liquid crystal display unit. It can be said that this is a scanning optical system.

The 22nd method of driving the wave crystal display device according to the present invention
In the embodiment, the optical system scans the inside of the block for each gate drive circuit in the liquid crystal display unit to turn on the light, and the other gate drive circuits turn on at different timings.

The twenty-third method of driving the liquid crystal display device of the present invention
In the embodiment, the 21st or 22nd embodiment is performed in the 1st to 16th embodiments of the driving method.

The twenty-fourth method of driving the liquid crystal display device of the present invention
Of the twenty-third embodiments of the driving method, the twenty-first and twenty-second embodiments of the present invention are particularly the twenty-first and twenty-second embodiments. The operation of the twenty-first embodiment of the twenty-fourth embodiment, which adopts the fourteenth embodiment, is as follows.

In the timing chart of FIG. 10, writing scanning and resetting are performed. Therefore, the drive is apparently the same as the conventional drive shown in FIG. But,
Since the number of scanning lines to be driven is reduced in each drive circuit, it is possible to drive in a circuit which cannot drive conventional scanning lines.
As a result, a drive circuit that is inexpensive and has good characteristics can be used.
On the other hand, when the light source is sequentially scanned in the display area and turned on in synchronization with the driving of the liquid crystal display unit, a very good display is obtained. As described above, according to this embodiment, excellent display can be obtained even when the light source is a scanning type.

In the twenty-fifth embodiment of the liquid crystal display device of the present invention, in the first to twenty-fourth embodiments of the driving method, the scanning timing of the scanning lines and the rise of the brightness of the light source are added as necessary. The scanning line and the light source are synchronized in consideration of the characteristics and the occurrence of display unevenness on the panel surface. For synchronization, a counter is provided for generating a deviation between the clock and a set predetermined clock. As this counter, a binary counter, a Johnson counter, or any other type of counter may be used.

The 26th method of driving the liquid crystal display device according to the present invention
In the embodiment, in the first to twenty-fifth embodiments, light from the incident optical system is prevented from entering the drive circuit section of the data drive circuit and the gate drive circuit. The non-incident method may be a light shielding layer or a patterned shutter layer, or may be another method.

The twenty-seventh method of driving the liquid crystal display device of the present invention
In the embodiment, light having a shape such that light does not enter the switch portion in the display area is emitted from the incident optical system to the liquid crystal display portion. This shape is striped, checkered,
It is conceivable that the dots in the dark portion are scattered, and other shapes may be used.

The twenty-eighth method of driving the liquid crystal display device of the present invention
In all of the above embodiments,
A method of doubling the number of data lines and halving the number of scanning lines is applied. This significantly reduces the load on the gate drive circuit. An example of the picture line arrangement in this case is shown in FIG.

The twenty-ninth method of driving the liquid crystal display device of the present invention
The embodiment is a liquid crystal display device in which an optical system sequentially scans a block selected from a large number of display area blocks formed by each divided gate drive circuit and each divided data drive circuit.

In FIG. 12, the gate drive circuit is divided into two,
An example of the embodiment of FIG. 4 in which the data drive circuit is also divided into two is schematically shown. (A) is the moment when light is emitted to the upper left, which is divided into four, (b) is the moment when light is emitted to the upper right, (c) is the moment when light is emitted to the lower left, and (d) is the right. It's the moment of shining down. For example, (a)-
Light is scanned in the order of (b)-(c)-(d). But,
It need not be in this order at all. Further, in this figure, it is assumed that all the blocks are turned on at the time of scanning the light, but the blocks may be scanned and irradiated. Further, a plurality of blocks may be irradiated at the same time.

In the above-described embodiment, only the diagram in which the synchronizing section is independent is shown as in FIG. 2, but other configurations may be adopted. For example, the synchronization unit may be provided in the drive circuit of the liquid crystal display unit or in the drive circuit of the light source.

[0093]

Embodiments of the present invention will now be described in detail with reference to the drawings.

First, the first embodiment of the liquid crystal display device of the present invention will be described with reference to FIG. FIG. 19 is an enlarged view showing a glass substrate having TFTs formed in an array according to the first embodiment of the present invention. The first embodiment is O
This is an example in which the present invention is applied by forming a liquid crystal display unit with a liquid crystal display element having a wide viewing angle by adding a compensating plate to a π cell called CB (optically compensated birefrigence). When the compensator configuration is changed, the complementary π cell structure (CPS: Co
mplementary pi-cell struc
It is also possible to set it to the true mode. The 480 gate bus lines (scan electrode lines) and the 640 drain bus lines (signal electrode lines) are made of chromium (Cr) formed by a sputtering method and have a line width of 10 μm. The gate insulating film is made of silicon nitride. (SiNx) was used. The size of one unit pixel is 330 μm in height and 110 μm in width,
A TFT (thin film transistor) was formed using amorphous silicon, and a pixel electrode was formed by a sputtering method using indium tin oxide (ITO) which is a transparent electrode. Thus, the glass substrate on which the TFTs are formed in an array as shown in the partially enlarged view of FIG. 19 was used as the first substrate. This first
After forming a light-shielding film using chromium on the second substrate facing the substrate of No. 3, color filters were formed in a matrix by a dyeing method. At the time of forming this color filter, the color filter of each color was set to 1.5 μm and three colors were overlapped to obtain an uneven structure of 4.5 μm. Furthermore, by stacking using a transparent resin material other than the color filter, the thickness is 6
It was made to be μm. Further, the concavo-convex structure was formed at a ratio of one per three signal electrode lines so as to face the signal electrode lines in a region other than the pixel opening portion when facing the TFT substrate. Polyamic acid was applied to the first and second substrates by spin coating and baked at 200 ° C. for imidization to form a polyimide film. On this polyimide film, a puff cloth using rayon is wrapped around a roller having a diameter of 50 mm, the rotation speed of the roller is 600 rpm, the stage moving speed is 40 mm / sec, the pushing amount is 0.7 mm, and the rubbing frequency is 2 times so that it becomes parallel la pink. I rubbed in the right direction. The thickness of the alignment film measured by the contact step meter is about 5
It was 00Å, and the pretilt angle measured by the crystal rotation method was 7 degrees. An ultraviolet curable sealing material in which a cylindrical glass rod spacer having a diameter of about 6 μm was dispersed was applied to one of such a pair of glass substrates.
These substrates are arranged so that both substrates face each other so that the rubbing treatment directions are parallel to each other, and the sealing material is cured by a treatment of irradiating ultraviolet rays in a non-contact manner to form a gap of 6 μm
Assembled panels. A nematic liquid crystal was injected into this panel. In this embodiment, SID 94.
OCB shown on pages 927 to 930 of the digest
(Optically Compensated Birefrigence) A compensator designed to obtain the same effect as the display mode was added. A driver for driving was attached to the liquid crystal panel manufactured in this manner to provide a liquid crystal display unit. In this liquid crystal display part, a display with high speed and wide viewing angle was obtained.

In the driving method according to the first example of the present invention, the seventeenth embodiment which adopts the sixth embodiment of the 200th embodiment of the driving method is adopted. As an incident light source, a backlight that is used for ordinary liquid crystal displays to inject light onto the entire surface was used, and the inverter circuit was modified to enable blinking of light and dark. With this method, a higher brightness display than the method from page 20 to page 23 of the proceedings of the seminar "LCD goes into the CRT monitor market-from the viewpoint of moving image display ..." was gotten. Also, when the blinking time of the backlight was adjusted so as to eliminate the uneven brightness on the panel surface without increasing the brightness, an extremely high quality display was obtained. Furthermore, a compensating plate is provided with a complementary π cell structure (CPS: Complementar).
When the configuration was changed to the y pi-cell structure) mode, a high-quality display with almost no color unevenness was obtained.

Next, the second embodiment of the present invention will be described with reference to FIG. FIG. 20 is a schematic diagram showing the timing of the light source in the second embodiment of the present invention. In the second embodiment of the present invention, the liquid crystal display mode is the same as that of the first embodiment, but the color filters and the protruding spacers are not formed, and spherical spacers made of silica are dispersed to manufacture a panel. A color time division optical system was combined with this liquid crystal display. As the color time division optical system, first, a structure using a rotary color time division color filter as a white light source was used. The timing of blinking the light source was according to the method of FIG. 20 (FIG. 11 of Japanese Patent Application No. 10-041689).
As a result, color time division display was possible.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 21 is a schematic view showing an optical system used in the third embodiment of the liquid crystal display device of the present invention. In the third embodiment, the color time division optical system of the second embodiment is changed to the following optical system. The color time division optical system in this embodiment is a color link (ColorLink) of the United States.
High transmittance 2 as shown in U.S. Pat. No. 5,751,384
An example of manufacturing using a color polarizing plate is shown below. FIG. 21 shows a schematic diagram of the optical system. The light from the white light source (the direction of incidence is shown by the arrow at the lower left of the figure) is divided into two types of linearly polarized light by using the polarization separation element 55, and then the other linearly polarized light is obtained by using the polarization rotation element 56 for one linearly polarized light. After setting the same vibration direction as
Synthesized. By this polarization conversion method, white light is adjusted to one linearly polarized light with very little loss. Although the mirror 57 is used here, it is not necessary depending on the devise of the optical system. Further, depending on the structure, it is possible to make the polarization conversion optical system thinner. After this, the yellow-blue two-color polarizing plate 5
8, liquid crystal element A59, monochromatic polarizing plate 60, liquid crystal element B6
1, cyan-red two-color polarizing plate 62 is arranged in this order. The yellow-blue two-color polarizing plate and the cyan-red two-color polarizing plate were made to have extremely little loss due to the constitution of ColorLink. However, since the configuration of ColorLink eliminates the monochromatic polarizing plate required at the time of incidence and is constructed by the above-mentioned polarization conversion method, light loss is extremely small.
In this method, in each of the liquid crystal element A59 and the liquid crystal element B61, the condition of rotating the polarized light by 90 degrees and the condition of not rotating the polarized light are combined to output black, red, edge, and blue light. It is possible.
With this method, color time division in the method of FIG. 41 was possible. In this method, the light utilization rate was higher than that in the second embodiment, and good display was possible.

Next, a fourth embodiment of the liquid crystal display device of the present invention will be described.

The fourth embodiment of the present invention is an example in which the present invention is applied to a smectic liquid crystal. TFT substrate and C
The F substrate was prepared in the same manner as in the first embodiment. However, the film thickness of one color of each color of the color filter was set to 1.6 rm, and the concavo-convex structure was formed using only this layer. In addition, an uneven structure is provided outside the display area so as to surround the display area and open only a part of the area. The uneven structure outside the display area replaces the wall of the sealing material, and the area where the mouth is open serves as the liquid crystal injection port. The insulating layer in the contact portion was patterned and removed. Then, both substrates were coated with polyamic acid by spin coating and baked at 180 ° C. for imidization to form a polyimide film. A puff cloth made of nylon is wrapped around this polyimide film around a roller with a diameter of 50 mm, and the rotation speed of the roller is 600 rpm, the stage moving speed is 40 mm / sec, the pushing amount is 0.7 mm, and the rubbing frequency is 2 times so that 10 ° cross rubbing is performed. Rubbed in the direction. The thickness of the alignment film measured by the contact step meter was about 500Å, and the pretilt angle measured by the crystal rotation method was 1.5 degrees. Such a pair of glass substrates are arranged to face each other so that the rubbing directions are 10 ° cross-rabbin.
The polyimide used for the alignment film was further cured by heat treatment at ℃ to have adhesiveness, and a panel having a gap of 1.6 μm was assembled. Asia Display 95 on this panel
A liquid crystal composition similar to the V-shaped switching antiferroelectric liquid crystal composition shown on pages 61 to 64 was injected in vacuum at 85 ° C. in an isotropic phase (Iso) state.
When the spontaneous polarization value of this liquid crystal was measured by applying a triangular wave, it was 165 nC / cm ² . In addition, the response speed varied depending on the gradation voltage, but from 200 microseconds to 80
It was between 0 microseconds. With the arbitrary waveform generator and high-power amplifier at 85 ° C, the frequency is 3k on the entire panel.
A rectangular wave having an amplitude of ± 10 V at Hz was applied, and while being applied with an electric field, it was gradually cooled to room temperature at a rate of 0.1 ° C./min.
A driver IC for driving was attached to the liquid crystal panel manufactured in this manner to provide a liquid crystal display unit. The display of the obtained liquid crystal panel has a sufficient contrast (contrast ratio of 200 or more) and has a wide viewing angle.
In addition, the display was good without image sticking or afterimage. The liquid crystal was aligned at the center of 10 ° cross rubbing, that is, at a position deviated by 5 ° from each rubbing direction.

In the driving method of the present embodiment, the twenty-first embodiment of the twenty-fourth embodiment of the driving method of the present invention, which adopts the fourteenth embodiment, is used. As the incident light source, the color time division optical system according to the ColorLink system of the third embodiment was used. However, in the liquid crystal element A and the liquid crystal element B, the electrodes were patterned and formed so that they could be used in the scanning mode. The liquid crystal used in the liquid crystal elements A and B is SSFLC made of ferroelectric liquid crystal.
High-speed response was realized using (surface-stabilized ferroelectric liquid crystal). In the present embodiment, the display by the color time division method with high image quality is realized.

Next, a fifth embodiment of the liquid crystal display device of the present invention will be described.

Although the same as in the first embodiment, a bright / dark blinking light source was used as the light source. In this blinking light source, a liquid crystal element having a shutter effect, in which electrodes are patterned, is arranged to be of a scanning type. As a result, a good scanning display with a bright and dark blinking light source was realized. With this method,
In particular, by adjusting the on / off timing of the liquid crystal element for the shutter, it was possible to adjust the degree of improvement due to the shutter effect in moving image display.

Next, with reference to FIG. 22 and FIG. 23, a sixth embodiment of the liquid crystal display device of the present invention will be explained. Figure 2
FIG. 2 is a sectional view showing a planar type pixel switch according to a sixth embodiment of the liquid crystal display device of the present invention, and FIG. 23 is a view showing voltage / transmittance characteristics of the liquid crystal material used. In this embodiment, polysilicon (polycrystalline silicon, pol
(y Si) TFT array was prepared and a smectic liquid crystal material having a small spontaneous polarization value was driven. Specifically, after forming a silicon oxide film on a glass substrate, amorphous silicon was grown. Next, it was annealed using an excimer laser to convert the amorphous silicon into polysilicon, and a 100 Å silicon oxide film was further grown. After patterning, the photoresist was patterned to be slightly larger than the gate shape (to form an LDD region later), and phosphorus ions were doped to form source and drain regions. Furthermore, after growing a silicon oxide film, microcrystalline silicon (μ-c-S
i) and tungsten silicide (WSi) were grown and patterned into a gate shape. Further, an LDD region was formed by doping phosphorus ions only in a necessary region with a patterned photoresist. After continuously growing a silicon oxide film and a silicon nitride film, a contact hole was opened, and aluminum and titanium were formed by sputtering and patterned. A silicon nitride film was formed, a contact hole was opened, and ITO, which is a transparent electrode for the pixel electrode, was formed and patterned. In this way, a planar type TFT pixel switch as shown in FIG. 22 was prepared to form a TFT array. T on the glass substrate
Only the pixel array by the FT switch was provided and the drive circuit was not provided in the substrate, but was attached outside by single crystal silicon.
After patterning the TFT array substrate thus manufactured and the ITO serving as the counter electrode over the entire surface, a counter substrate having a chromium patterning layer for light shielding was prepared. A 1.8 μ patterned pillar was formed on the side of the counter substrate so as to have a spacer and impact resistance. Further, a sealing material for UV curing was applied to the outside of the cut area of the counter substrate. Next, after bonding the TFT substrate and the counter substrate, liquid crystal was injected. As the liquid crystal material, a smectic liquid crystal material having a spontaneous polarization value of about 18 [nC / cm ² ] and capable of continuous gradation display was used. The voltage-transmittance characteristic of the liquid crystal material used had a shape as shown in FIG.

In the driving method of this example, the twenty-first embodiment of the twenty-fourth embodiment of the above-described driving method of the present invention was adopted which was the fourteenth embodiment. As an incident light source, Japanese Patent Application No. 11-01 invented by the present inventor
The light source according to the first embodiment of Japanese Patent Publication No. 9095 is adopted.
As a result, a light source capable of progressive scanning with little light loss was obtained. As a result, high image quality was obtained with extremely high light utilization efficiency.

[0105]

As described above, according to the driving method of the liquid crystal display device of the present invention, the scanning of each gate drive circuit block is started at substantially the same time when the light sources are of the collective lighting type. Therefore, there is an effect that the period that can be used for display can be extended.

Further, since the display period becomes long and the liquid crystal display and the light source can be linked by devising the driving method, there is an effect that a liquid crystal display device with high light utilization efficiency can be obtained.

Further, since the drive circuit is divided and each drive circuit unit is made small, there is an effect that a drive circuit which is inexpensive and has a simple structure can be used.

Furthermore, since the synchronization between the light source and the driving method is optimized, there is an effect that an extremely high quality display can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of a wave crystal display device of the present invention.

FIG. 2 is a block diagram showing a configuration of a second embodiment of a liquid crystal display device of the present invention.

FIG. 3 is a schematic diagram showing a display region and a drive circuit of the first embodiment of the liquid crystal display section in the present invention.

FIG. 4 is a schematic diagram showing a display area and a drive circuit of a second embodiment of a liquid crystal display section according to the present invention.

FIG. 5 is a schematic diagram showing a display region and a drive circuit of a third embodiment of a liquid crystal display unit in the present invention.

FIG. 6 is a schematic diagram showing a display area and a drive circuit of a fourth embodiment of a liquid crystal display section in the present invention.

FIG. 7 is a schematic diagram showing a display area and a drive circuit of a fifth embodiment of a liquid crystal display section in the present invention.

FIG. 8 is a schematic diagram showing a display region and a drive circuit of a sixth embodiment of a liquid crystal display section in the present invention.

FIG. 9 is a timing chart showing a reset mode of the driving method of the liquid crystal display device of the present invention.

FIG. 10 is a timing chart showing a reset mode of the driving method of the liquid crystal display device of the present invention.

FIG. 11 is a twenty-eighth method of driving the liquid crystal display device of the present invention.
FIG. 3 is a schematic diagram showing an arrangement of wirings and pixels in the embodiment.

FIG. 12 is a twenty-ninth method of driving the liquid crystal display device of the present invention.
It is a schematic diagram showing a state of light irradiation of the embodiment of,
(A) is the moment when light is emitted to the upper left, which is divided into four, (b) is the moment when light is emitted to the upper right, (c) is the moment when light is emitted to the lower left, and (d) is the lower right. Indicates the moment of irradiation.

FIG. 13 is a time chart for each scanning line in the third embodiment of the driving method of the present invention.

FIG. 14 is a waveform diagram of the scanning line voltage and the transmittance of the scanning line for one day from the top in the third embodiment of the driving method of the present invention.

FIG. 15 is a waveform diagram of the scanning line voltage and the transmittance of the scanning lines on the 8th day from the top in the third embodiment of the driving method of the present invention.

FIG. 16 is a time chart for each scanning line in the eleventh embodiment of the driving method of the present invention.

FIG. 17 is a waveform chart of the scanning line voltage and the transmittance of the first scanning line from the top in the eleventh embodiment of the driving method of the present invention.

FIG. 18 is a waveform chart of the scanning line voltage and the transmittance of the eighth scanning line from the top in the eleventh embodiment of the driving method of the present invention.

FIG. 19 is a schematic view showing a thin film transistor array according to a first embodiment of the present invention.

FIG. 20 is a blinking method of the light source of FIG. 11 of Japanese Patent Application No. 10-041689 adopted in a part of the second embodiment of the present invention, and is a time chart for each light source luminance and each scanning line.

FIG. 21 is a schematic view showing a color time division incident optical system according to the third embodiment of the invention.

FIG. 22 is a sectional view showing the structure of a planar type polysilicon TFT switch used in the sixth embodiment of the present invention.

FIG. 23 is a diagram showing a voltage transmittance characteristic of V-shaped switching used in a sixth embodiment of the present invention.

FIG. 24 is a diagram illustrating a data signal waveform by a conventional AC driving method, in which (a) is a waveform diagram of a data line applied voltage,
(B) is a waveform diagram of the voltage applied to the gate line, and (c) is a diagram showing a change in transmittance when the voltages of (a) and (b) are applied to the fast response liquid crystal.

25 is a diagram showing a timing chart for each scanning line and a display luminance for each scanning line in the conventional AC driving method of FIG.

FIG. 26 is a diagram showing a change with time in luminance when a reset method drive is applied to a conventional OCB mode.

FIG. 27 is a waveform diagram of an applied voltage for explaining a data signal waveform for preventing a conventional step response.

28 is a diagram showing a change in transmittance with the applied voltage of FIG. 27.

FIG. 29 is a timing chart showing a general batch reset in a conventional reset drive mode.

FIG. 30 is a timing chart showing scanning reset in the conventional reset driving mode.

31A and 31B are diagrams for explaining a data signal waveform by a conventional pseudo DC drive method. FIG. 31A is a waveform diagram of a data line applied voltage, FIG. 31B is a waveform diagram of a gate line applied voltage, and FIG. It is a figure which shows the transmittance | permeability change when the voltage of (a), (b) is applied to a response liquid crystal.

32 is a diagram showing a time chart for each scanning line and a display luminance for each scanning line in the conventional pseudo DC driving method of FIG. 31.

[Explanation of symbols]

1, 1a, 1b Data drive circuit 2, 2a, 2b Data drive circuit 3, 4 Data line group 5, 5a, 5b Gate drive circuit 6, 6a, 6b Gate drive circuit 5a-1, 5a-2, 5b-1, 5b to 2 divided gate drive circuits 6a-1, 6a-2, 6b-1, 6b to 2 divided gate drive circuits 7 color time division incident optical system 8 liquid crystal display section 9 synchronization section 10 display area 11 bright and dark blinking Incident optical system G1, G2 Scan lines D1a, D1b, D2a, D2b Data line 51 Data electrode line 52 Thin film transistor 53 Scan electrode line 54 Pixel electrode 55 Polarization separation element 56 Polarization rotator 57 Mirror 58 Yellow-blue polarization plate 59 Polarization element A 60 Monochromatic Polarizing Plate 61 Polarizing Element B 62 Cyan-Red Polarizing Plate 101 Positive Writing 102 Positive Display 103 Negative Writing 104 Negative Display 105 Display Between

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09G 3/20 622 G09G 3/20 622K 622Q 623 623U 641 641E 642 642A 642D 3/34 3/34 J (72 ) Inventor Kazunori Kimura 5-7-1, Shiba 5-chome, Minato-ku, Tokyo Inside NEC Corporation (72) Inventor Hideki Asada 5-7-1, Shiba 5-chome, Minato-ku, Tokyo F-term within NEC Corporation (reference) ) 2H093 NA16 NA65 NA80 NC13 NC34 NC43 ND34 ND49 ND54 NF04 5C006 AA01 AA14 AA22 AC11 AF42 AF44 AF71 BA15 BB16 BB29 BC02 BC03 BC22 EA01 FA12 FA14 FA16 FA22 FA23 FA25 FA29 FA03 FA25 DD2922 JJ01 JJ02 JJ04 JJ05 JJ06 KK04 KK50

Claims (8)

[Claims] 1. A liquid crystal display unit comprising a data driving circuit provided along both sides of two opposite sides of a rectangular display area and a gate driving circuit provided along another two opposite sides, and a display area. A color time-division incidence optical system arranged to sequentially enter light with different chromaticity, and a synchronization unit that synchronizes the liquid crystal display unit and the color time-division incidence optical system under predetermined conditions,
The gate drive circuit of the liquid crystal display unit is formed by being divided into a plurality of parts, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method for driving an existing liquid crystal display device, wherein the color time-division incidence optical system collectively illuminates the inside of each gate drive circuit block at a different timing from other gate drive circuits. Device driving method. 2. A liquid crystal display unit comprising a data drive circuit provided along both sides of two opposite sides of a rectangular display area and a gate drive circuit provided along another two opposite sides, and a display area. A liquid crystal display unit and a synchronizing unit that synchronizes the liquid crystal display unit and the bright and dark blinking incident optical system with each other under a predetermined condition. The gate drive circuit of the display portion is formed by being divided into a plurality of portions, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method for driving a liquid crystal display device, characterized in that a bright / dark blinking incident optical system collectively turns on the inside of each gate drive circuit block at a different timing from other gate drive circuits. The driving method of location. 3. A liquid crystal display unit comprising a data driving circuit provided along both sides of two opposite sides of a rectangular display area and a gate driving circuit provided along the other two opposite sides, and a display area. A color time-division incidence optical system arranged to sequentially enter light with different chromaticity, and a synchronization unit that synchronizes the liquid crystal display unit and the color time-division incidence optical system under predetermined conditions,
The gate drive circuit of the liquid crystal display unit is formed by being divided into a plurality of parts, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method for driving an existing liquid crystal display device, wherein the color time-division incidence optical system turns on while scanning a block of each gate drive circuit at a timing different from other gate drive circuits. Device driving method. 4. A liquid crystal display unit comprising a data driving circuit provided along both sides of two opposite sides of a rectangular display area and a gate driving circuit provided along the other two opposite sides, and a display area. A liquid crystal display unit and a synchronizing unit that synchronizes the liquid crystal display unit and the bright and dark blinking incident optical system with each other under a predetermined condition. The gate drive circuit of the display portion is formed by being divided into a plurality of portions, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method for driving a liquid crystal display device, characterized in that a bright / dark blinking incident optical system is turned on while scanning a block of each gate drive circuit at a timing different from that of other gate drive circuits. The driving method of shows apparatus. 5. A liquid crystal display unit comprising a data driving circuit provided along both sides of two opposite sides of a rectangular display area and a gate driving circuit provided along the other two opposite sides, and a display area. A color time-division incidence optical system arranged to sequentially enter light with different chromaticity, and a synchronization unit that synchronizes the liquid crystal display unit and the color time-division incidence optical system under predetermined conditions,
The gate drive circuit of the liquid crystal display unit is formed by being divided into a plurality of parts, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method of driving a liquid crystal display device, in which each of the gate drive circuits performs reset while scanning, and after the scanning of one gate drive circuit is completed, another gate drive circuit starts writing, The time-division incidence optical system collectively turns on the inside of each gate drive circuit block at a different timing from other gate drive circuits, and the synchronization unit performs scanning timing for each gate drive circuit,
A method for driving a liquid crystal display device, characterized in that scanning of scanning lines and timing of incidence of a light source are synchronized on the basis of rising characteristics of luminance of a light source and occurrence of display unevenness on a panel surface. 6. A liquid crystal display unit comprising a data drive circuit provided along both sides of two opposite sides of a rectangular display area and a gate drive circuit provided along the other two opposite sides, and a display area. A liquid crystal display unit and a synchronizing unit that synchronizes the liquid crystal display unit and the bright and dark blinking incident optical system with each other under a predetermined condition. The gate drive circuit of the display portion is formed by being divided into a plurality of portions, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method of driving a liquid crystal display device, in which each of the gate drive circuits resets while scanning, and after the scanning of one gate drive circuit ends, another gate drive circuit starts writing. , The scanning timing of light and dark flashing incident optical system, lights collectively within a block of each of the gate drive circuit at a timing different from that of the other gate drive circuit, the synchronization unit performs each of the gate drive circuit,
A method for driving a liquid crystal display device, characterized in that scanning of scanning lines and timing of incidence of a light source are synchronized on the basis of rising characteristics of luminance of a light source and occurrence of display unevenness on a panel surface. 7. A liquid crystal display unit comprising a data driving circuit provided along both sides of two opposite sides of a rectangular display area and a gate driving circuit provided along another two opposite sides, and a display area. A color time-division incidence optical system arranged to sequentially enter light with different chromaticity, and a synchronization unit that synchronizes the liquid crystal display unit and the color time-division incidence optical system under predetermined conditions,
The gate drive circuit of the liquid crystal display unit is formed by being divided into a plurality of parts, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method of driving a liquid crystal display device, in which each of the gate drive circuits performs reset while scanning, and after the scanning of one gate drive circuit is completed, another gate drive circuit starts writing, The time-division incidence optical system illuminates while scanning the blocks of each gate drive circuit at a timing different from that of the other gate drive circuits, and the synchronization unit performs scanning timing of each of the gate drive circuits.
A method for driving a liquid crystal display device, characterized in that scanning of scanning lines and timing of incidence of a light source are synchronized on the basis of rising characteristics of luminance of a light source and occurrence of display unevenness on a panel surface. 8. A liquid crystal display unit comprising a data drive circuit provided along both sides of two opposite sides of a rectangular display area and a gate drive circuit provided along another two opposite sides, and a display area. A liquid crystal display unit and a synchronizing unit that synchronizes the liquid crystal display unit and the bright and dark blinking incident optical system with each other under a predetermined condition. The gate drive circuit of the display portion is formed by being divided into a plurality of portions, and each data line group extending from each of the data drive circuits is electrically separated in each of the plurality of divided gate drive circuits. A method of driving a liquid crystal display device, in which each of the gate drive circuits resets while scanning, and after the scanning of one gate drive circuit ends, another gate drive circuit starts writing. , Scanning timing dark flashing incident optical system, at a timing different from that of the other gate drive circuit, the lights while scanning the blocks of each gate drive circuit, the synchronization unit performs each of the gate drive circuit,
A method for driving a liquid crystal display device, characterized in that scanning of scanning lines and timing of incidence of a light source are synchronized on the basis of rising characteristics of luminance of a light source and occurrence of display unevenness on a panel surface.