WO2012127810A1

WO2012127810A1 - Liquid crystal display device

Info

Publication number: WO2012127810A1
Application number: PCT/JP2012/001699
Authority: WO
Inventors: 宮本　忠芳; 中野　文樹
Original assignee: シャープ株式会社
Priority date: 2011-03-18
Filing date: 2012-03-12
Publication date: 2012-09-27

Abstract

In the present invention, a liquid crystal display device is provided with the following: a drive circuit that drives a plurality of sub-pixels by applying a signal voltage; and a signal voltage modulation circuit that modulates a signal voltage that is applied to high luminosity sub-pixels to a relatively high frequency, and that modulates the signal voltage applied to low luminosity sub-pixels to the same relatively high frequency as that of the signal voltage applied to the high luminosity sub-pixels, or to a frequency lower than that frequency.

Description

Liquid crystal display

The present invention relates to a liquid crystal display device.

In recent years, for example, the demand for mobile devices such as mobile phones, smartphones, and tablet terminals is increasing, and medium-sized or small-sized liquid crystal display devices are widely used as display devices. In these mobile devices, since the capacity of the battery is limited, there is an increasing demand for low power consumption.

As a means for reducing the power consumption of a liquid crystal display device, it is known to drive the liquid crystal display device at a low frequency as disclosed in, for example, Patent Document 1.

However, when the liquid crystal display device is driven at a low frequency, it is possible to reduce the power consumption, but there is a problem that flicker (flickering of the screen) easily occurs and the display quality is deteriorated. Flicker is a phenomenon that occurs when the screen update cycle (frame cycle) is close to the afterimage time of the eye, and flicker tends to increase as the drive frequency decreases.

Here, in the liquid crystal display device of the above-mentioned Patent Document 1, when the temperature of the display panel rises at the time of low-frequency driving, the temperature sensor and the frequency modulation connected to the temperature sensor are taken into consideration that flicker is particularly easily recognized. Circuit. In a liquid crystal display device that is driven at a low frequency, the drive frequency is gradually increased by the frequency modulation circuit as the temperature of the display panel detected by the temperature sensor becomes higher. As a result, the liquid crystal display device driven at a low frequency tries to suppress flicker.

JP 2005-091385 A

However, in the liquid crystal display device of Patent Document 1, when the temperature of the display panel rises sufficiently due to, for example, continuous display operation for a long time, the liquid crystal display device continues to be driven at a relatively high frequency. Therefore, there is room for improvement in terms of reducing power consumption.

On the other hand, it may be desirable to drive at high frequency from the viewpoint of display quality. For example, in the case of displaying a moving image, when the liquid crystal display device is driven at a low frequency, the display quality tends to be lower than when the liquid crystal device is driven at a high frequency.

The present invention has been made in view of such a point, and an object of the present invention is to reduce power consumption while maintaining high display quality of a liquid crystal display device.

In order to achieve the above object, a liquid crystal display device according to the present invention includes a plurality of pixels, a plurality of sub-pixels provided for each of the plurality of pixels and formed for each of a plurality of display colors, and the plurality of the plurality of pixels. By applying a signal voltage to the sub-pixel, a driving circuit that drives the plurality of sub-pixels, and among the plurality of sub-pixels included in the pixel, the visibility of the display color is the other sub-pixel in the pixel. The signal voltage applied to the high visibility subpixel is modulated to a relatively high frequency so that the high visibility subpixel higher than the pixel is driven at a high frequency, while the other subpixels in the pixel are low The signal voltage applied to the low visibility subpixel is set to a relatively high frequency equal to or higher than the signal voltage applied to the high visibility subpixel so that the visibility subpixel is driven at high frequency or low frequency. frequency And a signal voltage modulation circuit for modulating a frequency lower than.

According to the present invention, the high visibility sub-pixel is driven at high frequency, while the low visibility sub-pixel is driven at high frequency or low frequency, so that the display quality of the liquid crystal display device is maintained high. The power consumption can be reduced.

FIG. 1 is a wiring diagram schematically showing a circuit configuration of the liquid crystal display device according to the first embodiment. FIG. 2 is a cross-sectional view illustrating a schematic structure of a liquid crystal display device provided in the electronic apparatus according to the first embodiment. FIG. 3 is a wiring diagram schematically showing the overall configuration of the liquid crystal display device according to the first embodiment. FIG. 4 is a wiring diagram showing sub-pixels included in one pixel in the first embodiment. FIG. 5 is a waveform diagram showing signal voltages applied to the sub-pixels. FIG. 6 is a waveform diagram showing signal voltages applied to the sub-pixels. FIG. 7 is a table showing the frequency of the signal voltage modulated by each sub-pixel. FIG. 8 is a wiring diagram showing sub-pixels included in one pixel in the second embodiment. FIG. 9 is a wiring diagram showing sub-pixels included in one pixel in the third embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiment.

Embodiment 1 of the Invention
1 to 7 show Embodiment 1 of the present invention.

FIG. 1 is a wiring diagram schematically showing a circuit configuration of the liquid crystal display device according to the first embodiment. FIG. 2 is a cross-sectional view illustrating a schematic structure of a liquid crystal display device provided in the electronic apparatus according to the first embodiment.

FIG. 3 is a wiring diagram schematically showing the overall configuration of the liquid crystal display device according to the first embodiment. FIG. 4 is a wiring diagram showing sub-pixels included in one pixel. 5 and 6 are waveform diagrams showing signal voltages applied to the sub-pixels. FIG. 7 is a table showing the frequency of the signal voltage modulated by each sub-pixel.

As shown in FIG. 2, the liquid crystal display device 1 according to Embodiment 1 includes a liquid crystal display panel 11 and a backlight unit 12 that is a light source disposed on the back side of the liquid crystal display panel 11. That is, the liquid crystal display device 1 is configured to perform transmissive display by selectively transmitting at least light from the backlight unit 12.

As shown in FIG. 2, the liquid crystal display panel 11 includes a TFT substrate 13 that is a first substrate, and a counter substrate 14 that is a second substrate disposed to face the TFT substrate 13. A liquid crystal layer 15 is sealed between the TFT substrate 13 and the counter substrate 14 by a seal member 16.

The liquid crystal display panel 11 has a display screen 10 as a display area and a frame-like non-display area (not shown) provided around the display screen 10. A plurality of pixels 18 provided in a matrix are formed in the display area. Each pixel 18 is provided with a plurality of sub-pixels 19 formed for each of a plurality of display colors.

As shown in FIG. 3 in a simplified manner, the TFT substrate 13 is composed of an active matrix substrate. The TFT substrate 13 has a glass substrate 21 as a transparent substrate. On the glass substrate 21, a plurality of source lines 23 extending in parallel with each other and a plurality of gate lines 22 extending so as to intersect the source lines 23 are formed.

Further, the liquid crystal display device 1 includes a source driver 31 connected to the source line 23, a COG driver 32 connected to the source driver, and a gate driver 33 connected to the gate line 22.

The plurality of gate lines 22 and the plurality of source lines 23 are formed in a lattice shape as a whole, and the sub-pixels 19 are formed in regions surrounded by the gate lines 22 and the source lines 23 in a rectangular shape.

Each subpixel 19 is provided with a TFT (thin film transistor) 20 in the vicinity of the intersection of the gate wiring 22 and the source wiring 23. The gate wiring 22 and the source wiring 23 are connected to the TFT 20. Each subpixel 19 is formed with a pixel electrode (not shown) connected to the drain electrode (not shown) of the TFT 20 provided in the subpixel 19. The pixel electrode 30 is made of a transparent conductive film such as ITO (Indium Tin Oxide).

The structure of the TFT 20 may be a bottom gate type or a top gate type. Although not shown, a storage capacitor Cs may be formed on the glass substrate 21 between the storage capacitor line and the drain electrode of the TFT 20. Thereby, the potential fluctuation of the pixel electrode due to the parasitic capacitance and the off-leak current of the TFT 20 can be suppressed.

On the other hand, a color filter (not shown) having a plurality of colored layers and a common electrode (not shown) provided in common with the plurality of pixel electrodes are formed on the counter substrate 14. Similarly to the pixel electrode, the common electrode is also formed of a transparent conductive film such as ITO. Thus, the orientation of the liquid crystal layer 15 is controlled for each sub-pixel 19 by controlling the potential difference between the common electrode having a predetermined potential and the pixel electrode of each sub-pixel 19.

In the present embodiment, one pixel 18 is provided with

sub-pixels

19r, 19g, and 19b of three primary colors of red (R), green (G), and blue (B). The green (G) sub-pixel 19 g is configured to display a green (G) display color by a green (G) colored layer formed on the counter substrate 14. Similarly to the green (G) sub-pixel 19g, the red (R) sub-pixel 19r and the blue (B) sub-pixel 19b are respectively formed by a red (R) coloring layer and a blue (B) coloring layer. The display color of red (R) or blue (B) is displayed.

As shown in FIG. 4, to one pixel 18, three source wirings 23 and two gate wirings 22 respectively connected to the sub-pixels 19r, 19g, and 19b are connected. Two sub-pixels 19r and 19b are connected to one gate wiring 22, and the remaining one sub-pixel 19g is connected to the other gate wiring.

As shown in FIG. 1, the liquid crystal display device 1 is a drive circuit that drives a plurality of

subpixels

19r, 19g, and 19b by applying a signal voltage to the plurality of

subpixels

19r, 19g, and 19b. The source driver 31 and a signal voltage modulation circuit 40 that modulates the frequency of the signal voltage are provided.

A video line 25 provided for each color of red (R), green (G), and blue (B) is connected to the source driver 31. One end of a plurality of source lines 23 is connected to the video line 25. Each source line 23 is provided with a switch 26. The other end of the source line 23 is connected to each pixel 18.

The signal voltage modulation circuit 40 is provided on a video line between the source driver 31 and the source wiring 23. The signal voltage modulation circuit 40 is provided in each pixel 18.

Here, the green (G) sub-pixel 19g has a higher visibility sensitivity than the other sub-pixels 19r and 19b in the pixel 18 in which the sub-pixel 19g is provided. It is a pixel. On the other hand, the other sub-pixels 19r and 19b in the pixel 18 are low-visibility sub-pixels whose visual sensitivities of red (R) and blue (B) are lower than that of green (G).

As shown in FIGS. 1 and 4, the signal voltage modulation circuit 40 modulates the signal voltage applied to the high visibility subpixel 19g to a relatively high frequency so that the high visibility subpixel 19g is driven at a high frequency. On the other hand, the signal voltage applied to the

low visibility subpixels

19r and 19b is applied to the high visibility subpixel 19g so that the

low visibility subpixels

19r and 19b are driven at high frequency or low frequency. It is configured to modulate to the same relatively high frequency as the voltage or a frequency lower than that frequency.

The source driver 31 is configured to apply a signal voltage for displaying a still image or a moving image on the display screen 10 to the plurality of sub-pixels 19. When the signal voltage modulation circuit 40 displays a still image on the display screen 10, the high-visibility subpixel 19g is driven at a high frequency and the low-

visibility subpixels

19r and 19b are driven at a low frequency. When displaying a moving image, the high visibility sub-pixel 19g and the

low visibility sub-pixels

19r and 19b are configured to be driven at a high frequency.

The signal voltage modulation circuit 40 includes a modulation unit 41 provided on each of the red (R) video line 25r and the blue (B) video line 25b, and a determination unit 42 connected to the modulation unit 41. ing.

The determination unit 42 determines whether the image displayed on the display screen 10 is a still image or a moving image. When the determination unit 42 determines that the display image is a still image, the modulation unit 41 lowers the frequency of the signal voltage. On the other hand, when the determination unit 42 determines that the display image is a moving image, the modulation unit 41 maintains the signal voltage at a high frequency.

Here, FIG. 7 shows changes in the frequency of the signal voltage in the region a on the source driver 31 side of the modulation unit 41 in FIG. 1 and the region b on the sub-pixel 19 side of the modulation unit 41 in FIG. As shown in FIG. 7, the signal voltages in the region a output from the source driver 31 to the

video lines

25r, 25g, and 25b all have a relatively high frequency of 60 Hz, as shown in FIG. .

As shown in FIG. 6, when the determination unit 42 determines that the display image is a still image, the frequency of the signal voltage of the

video lines

25 r and 25 b is modulated from 60 Hz to 15 Hz, for example, by the modulation unit 41. . On the other hand, for the video line 25g, the frequency of the signal voltage is maintained at 60 Hz.

Thus, the video line 25g signal voltage is applied to the high visibility sub-pixel 19g at a high frequency of 60 Hz. The signal voltages of the

video lines

25r and 25b are applied to the

low visibility sub-pixels

19r and 19b at a low frequency of 15 Hz. As a result, in the case of still image display, the

low visibility subpixels

19r and 19b are driven at a low frequency, and the high visibility subpixel 19g is driven at a high frequency.

As shown in FIG. 5, when the determination unit 42 determines that the display image is a moving image, the frequency of the signal voltage of each

video line

25r, 25g, 25b is maintained at 60 Hz by the modulation unit 41. Thus, each signal voltage is applied to the high visibility subpixel 19g and the

low visibility subpixels

19r and 19b at a high frequency of 60 Hz. As a result, in the case of moving image display, all the sub-pixels 19r, 19g, 19b are driven at a high frequency.

-Effect of Embodiment 1-
Therefore, according to the first embodiment, the high visibility sub-pixel 19g that is easy to be visually recognized by the user of the liquid crystal display device 1 is low-frequency that is difficult for the user to visually recognize while maintaining high display quality by driving at high frequency. The sensitivity sub-pixels 19r and 19b can be driven at a high frequency or a low frequency so that the power consumption of the liquid crystal display device 1 can be reduced. Therefore, it is possible to reduce the power consumption while maintaining the display quality of the liquid crystal display device 1 high.

In particular, when the high visibility subpixel 19g is driven at a low frequency, flicker is likely to be visually recognized. However, in this embodiment, when displaying a still image on the display screen 10, the high visibility subpixel 19g is driven at a high frequency to reduce flicker. The low-

visibility sub-pixels

19r and 19b that are less likely to occur and difficult to be recognized even when flicker occurs are driven at a low frequency, so that low power consumption is achieved by driving at a low frequency while a still image is displayed. The display quality can be maintained high so that the flicker is hardly visually recognized while aiming. Further, high-quality display can always be performed with high-frequency driving for moving images.

For example, when the liquid crystal display device 1 is used in a mobile device such as a smartphone, there may be a case where a still image display such as a standby image and a moving image display are frequently switched. Therefore, the liquid crystal display device 1 is also suitable for such mobile devices.

<< Embodiment 2 of the Invention >>
FIG. 8 shows Embodiment 2 of the present invention.

FIG. 8 is a wiring diagram showing sub-pixels included in one pixel in the second embodiment. In the following embodiments, the same portions as those in FIGS. 1 to 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

This embodiment is obtained by improving the pixel 18 in the first embodiment. As shown in FIG. 8, one source 18 is connected with three source lines 23 and two gate lines 22 respectively connected to the sub-pixels 19r, 19g, and 19b. Two sub-pixels 19r and 19b are connected to one gate wiring 22, and the remaining one sub-pixel 19g is connected to the other gate wiring.

As shown in FIG. 8, the

low visibility sub-pixels

19r and 19b are formed with a functional circuit unit 50 for keeping the signal voltage applied to the sub-pixels 19r and 19b constant.

For example, in the

low visibility sub-pixels

19r and 19b, a memory circuit unit 51 that stores display information in the sub-pixels 19r and 19b is formed as a functional circuit unit 50. The memory circuit unit 51 includes a dynamic random access memory (DRAM) and a static random access memory (SRAM).

In addition, the functional circuit unit 50 can be configured by a refresh circuit unit 52 that re-applies the signal voltage applied to the

low visibility sub-pixels

19r and 19b. For example, when inverting the polarity of the signal voltage, the same voltage is refreshed and applied again to the

low visibility sub-pixels

19r and 19b.

Also in the present embodiment, the signal voltage modulation circuit 40 includes the modulation unit 41 provided on the red (R) video line 25r and the blue (B) video line 25b, respectively, and the determination connected to the modulation unit 41. Part 42.

That is, as shown in FIG. 7, the signal voltages in the region a output from the source driver 31 to the

video lines

25r, 25g, and 25b all have a relatively high frequency of 60 Hz.

When the determination unit 42 determines that the display image is a still image, the frequency of the signal voltage of the

video lines

25r and 25b is modulated by the modulation unit 41 from 60 Hz to, for example, about 1 Hz. On the other hand, for the video line 25g, the frequency of the signal voltage is maintained at 60 Hz.

video lines

25r and 25b are applied to the

low visibility sub-pixels

19r and 19b at a frequency as low as about 1 Hz.

When the functional circuit unit 50 is the memory circuit unit 51, the memory circuit unit 51 stores the signal voltage applied to the

low visibility sub-pixels

19r and 19b. On the other hand, when the functional circuit unit 50 is the refresh circuit unit 52, refresh is performed when the polarity of the signal voltage is inverted, and the same voltage is applied again to the

low visibility sub-pixels

19r and 19b. As a result, the signal voltage in the

low visibility sub-pixels

19r and 19b is maintained.

As a result, in the case of still image display, the

low visibility sub-pixels

19r and 19b are driven at a low frequency, and the high visibility sub-pixel 19g is driven at a high frequency.

On the other hand, when the determination unit 42 determines that the display image is a moving image, the frequency of the signal voltage of each

video line

low visibility subpixels

-Effect of Embodiment 2-
Therefore, according to the second embodiment, it is possible to reduce the power consumption while maintaining the display quality of the liquid crystal display device 1 high. That is, the high visibility sub-pixel 19g is likely to visually recognize flicker when driven at a low frequency. However, in this embodiment, when displaying a still image on the display screen 10, the high visibility sub-pixel 19g is driven at a high frequency to reduce flicker. The

low visibility sub-pixels

In addition, in this embodiment, since the functional circuit unit 50 is provided in the

low visibility sub-pixels

19r and 19b, the sub-pixels 19r and 19b can be driven at a lower frequency. Can be reduced. In addition, when such a functional circuit unit 50 is provided, the aperture ratio of the sub-pixel 19 is reduced. In this embodiment, the functional circuit unit 50 is provided on the low-

viscosity sub-pixels

19r and 19b that are difficult for the user to visually recognize. Since it is not provided in the high visibility sub-pixel 19g that is easily visible to the user, it is possible to achieve low power consumption while suppressing deterioration in display quality.

Furthermore, by providing a memory driver, not only flicker can be suppressed, but also image burn-in due to ultra-low frequency driving of about 1 Hz can be suppressed, and the reliability of the display device can be improved.

<< Embodiment 3 of the Invention >>
FIG. 9 shows Embodiment 3 of the present invention.

FIG. 9 is a wiring diagram showing sub-pixels included in one pixel in the third embodiment.

In the first embodiment, the driving frequencies of the two

low visibility subpixels

19r and 19b are set to the same frequency, whereas in the present embodiment, the driving frequencies of the two

low visibility subpixels

19r and 19b are different from each other. It is a frequency.

Here, one pixel 18 in the present embodiment is provided with a plurality of sub-pixels 19r, 19g, and 19b of three primary colors of red (R), green (G), and blue (B). As shown in FIG. 9, one source 18 is connected with three source lines 23 and three gate lines 22 respectively connected to the sub-pixels 19r, 19g, and 19b. The sub-pixels 19r, 19g, and 19b are connected to different gate lines 22.

The display color of each of the sub-pixels 19r, 19g, and 19b is green (G), which has the highest visibility, and green (G), red (R), and blue (B) in order of decreasing visibility (G > R> B). The signal voltage modulation circuit 40 in the present embodiment modulates the signal voltage applied to the low visibility subpixel 19b having a low display color visibility among the plurality of

low visibility subpixels

19r and 19b to a lower frequency. It is configured as follows.

Also in this embodiment, the signal voltage modulation circuit 40 is provided with a modulation unit 41 provided for each of the red (R) video line 25r and the blue (B) video line 25b, and determination of being connected to the modulation unit 41. Part 42.

video lines

25r, 25g, and 25b all have a relatively high frequency of 60 Hz.

When the determination unit 42 determines that the display image is a still image, the modulation unit 41 reduces the frequency of the signal voltage in the video line 25r from 60 Hz to, for example, 30 Hz, and reduces the frequency of the signal voltage in the video line 25b to 60 Hz. To, for example, 15 Hz. On the other hand, for the video line 25g, the frequency of the signal voltage is maintained at 60 Hz.

Thus, the video line 25g signal voltage is applied to the high visibility sub-pixel 19g at a high frequency of 60 Hz. The signal voltage of the video line 25r is applied to the low visibility sub-pixel 19r at a low frequency of about 30 Hz. On the other hand, the signal voltage of the video line 25b is applied to the low visibility sub-pixel 19b at a lower frequency of about 15 Hz.

As a result, in the case of still image display, the

low visibility sub-pixels

19r and 19b are driven at a low frequency, and the high visibility sub-pixel 19g is driven at a high frequency. Further, the low visibility subpixel 19b is driven at a lower frequency than the low visibility subpixel 19r.

video line

low visibility subpixels

-Effect of Embodiment 3-
Therefore, according to the third embodiment, it is possible to reduce the power consumption while maintaining the display quality of the liquid crystal display device 1 high. That is, the high visibility sub-pixel 19g is likely to visually recognize flicker when driven at a low frequency. However, in this embodiment, when displaying a still image on the display screen 10, the high visibility sub-pixel 19g is driven at a high frequency to reduce flicker. The

low visibility sub-pixels

In addition, in the present embodiment, when displaying a still image, the plurality of

low visibility sub-pixels

19r and 19b are also provided with a difference in driving frequency according to the visibility, so that the visibility is the highest. Since the driving frequency of the low low visibility sub-pixel 19b is set lower than the driving frequency of the other low visibility sub-pixel 19r, the sub-pixel 19b having a lower visibility and less likely to see flicker is set to a lower frequency. Can drive.

Therefore, as the driving frequency of the sub-pixel 19 is lowered and flicker is likely to occur, the visibility of the display color can be lowered and the visual recognition is difficult. As a result, the balance between the improvement in display quality by reducing the visibility of flicker and the reduction in power consumption by low-frequency driving is optimized according to the visibility of each sub-pixel 19r, 19g, 19b. can do.

<< Other Embodiments >>
In each of the above embodiments, the case where the display color of the sub-pixel 19 is the three primary colors R, G, and B has been described, but the present invention is not limited to this. For example, the display color of the sub-pixel 19 may be four colors of R, G, B, and Y (yellow), or may be R, G, B, and W (white).

When the display colors of the sub-pixel 19 are four colors of R, G, B, and Y, in the second embodiment, the green (G) sub-pixel 19g is used as the high visibility sub-pixel and a still image is displayed. At this time, the driving frequencies of the other

low visibility sub-pixels

19r, 19b, and 19y may be decreased in the order of Y, R, and B (G <Y <R <B).

Further, the present invention is not limited to the above-described first to third embodiments, and the present invention includes a configuration in which these first to third embodiments are appropriately combined. Therefore, for example, when a still image is displayed while the functional circuit unit 50 is provided in the

low visibility sub-pixels

19r and 19b as in the second embodiment, the driving frequency of the sub-pixel 19b is higher than the driving frequency of the sub-pixel 19r. You may make it low.

As described above, the present invention is useful for a liquid crystal display device.

1 Liquid crystal display device
10 Display screen
18 pixels
19 sub-pixels
19r, 19b Low visibility sub-pixel
19g high visibility sub-pixel
31 Source driver (drive circuit)
40 Signal voltage modulation circuit
41 Modulator
42 Judgment part
50 Function circuit
51 Memory circuit section
52 Refresh circuit section

Claims

A plurality of pixels;
A plurality of sub-pixels provided for each of the plurality of pixels and formed for each of a plurality of display colors;
A driving circuit for driving the plurality of subpixels by applying a signal voltage to the plurality of subpixels;
Among the plurality of sub-pixels included in the pixel, the high-visibility sub-pixel such that a high-visibility sub-pixel having a higher visibility than the other sub-pixels in the pixel is driven at high frequency. The low-viscosity subpixel is modulated so that the low-viscosity subpixel, which is the other subpixel in the pixel, is driven at a high frequency or a low frequency while the signal voltage applied to is modulated to a relatively high frequency. A liquid crystal comprising: a signal voltage modulation circuit that modulates an applied signal voltage to the same relatively high frequency as the signal voltage applied to the high visibility sub-pixel or a frequency lower than the same. Display device.
The liquid crystal display device according to claim 1,
A display screen having the plurality of pixels,
The drive circuit is configured to apply a signal voltage for displaying a still image or a moving image on the display screen to the plurality of sub-pixels,
When displaying a still image on the display screen, the signal voltage modulation circuit drives the high visibility sub-pixel at a high frequency and drives the low visibility sub-pixel at a low frequency while displaying a moving image on the display screen. In this case, the liquid crystal display device is configured to drive the high visibility sub-pixel and the low visibility sub-pixel at a high frequency.
The liquid crystal display device according to claim 1 or 2,
One pixel is provided with a plurality of the low visibility sub-pixels,
The liquid crystal display device, wherein the signal voltage modulation circuit modulates a signal voltage applied to a low visibility subpixel having a low visibility of display color among the plurality of low visibility subpixels to a lower frequency.
The liquid crystal display device according to any one of claims 1 to 3,
The liquid crystal display device according to claim 1, wherein a memory circuit unit for storing display information in the low visibility subpixel is formed in the low visibility subpixel.
The liquid crystal display device according to any one of claims 1 to 3,
The liquid crystal display device according to claim 1, wherein the low visibility sub-pixel is provided with a refresh circuit portion for reapplying a signal voltage applied to the low visibility sub-pixel.
The liquid crystal display device according to any one of claims 1 to 5,
The liquid crystal display device, wherein the pixel is provided with the sub-pixels of three colors of red, green, and blue.
The liquid crystal display device according to claim 6,
The liquid crystal display device, wherein the high visibility subpixel is a green subpixel.