JP2001255508A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device for displaying a uniform gradation level in the pixels, corresponding to each gate line when a backlight is turned on, in contrast to the case of not completely ending the response of the liquid crystal. SOLUTION: A liquid crystal display element is provided with n gate lines and m data lines and comprises pixel cells which are arranged in a matrix form, corresponding to the intersections of the gate lines and data lines. In a liquid crystal display device, which is provided with the liquid crystal display element and where a selection signal to the a-th gate line to be scanned (a is an integer where 1<=a<=n) is applied at a time ta, and a selection signal to the b-th gate line (b is an integer, b≠a and 1<=b<=n) is applied at a time tb, and backlight made incident on a pixel cell Ca corresponding to the a-th gate line and a pixel cell Cb, corresponding to the b-th gate line, is turned on and off almost simultaneously, a voltage level regulating means is provided for adjusting the voltage levels to be applied to the pixel cells Ca, Cb, so as to obtain almost the same level of luminance as at the pixel cells Ca, Cb.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to turning on and off a backlight in a liquid crystal display device.

[0002]

2. Description of the Related Art When a moving image is displayed on a CRT and a liquid crystal display, the image is clearly seen on the CRT, whereas the moving image is blurred on the liquid crystal display. For example, when viewing an image of a baseball ball moving laterally from the side of the screen on a liquid crystal display, the phenomenon is such that the ball looks like a tail. The cause of this was that the response speed of the liquid crystal was slow and it was not possible to completely respond within one frame.

However, recently, it has been found that the liquid crystal display system itself is the cause of blurring of a moving image. This will be described in detail below.

The time response of display light at a certain pixel of a liquid crystal and a CRT is as shown in FIGS. 9 and 10, respectively. The display light of the CRT is impulse-like (see FIG. 10).
On the other hand, the display light of the liquid crystal is held for one field (see FIG. 9).

In the display of the hold type, as shown in FIG. 11, for example, an image composed of four pixels is 4 (pixels / (1
/ 60) second), when a moving image moving rightward is displayed, the human gaze moves as indicated by the arrow in the figure, and
Due to the effect of the time integration, only the average brightness of the four pixels is perceived instead of the information of the four pixels. This causes motion blur, and the motion blur occurs in the liquid crystal display.

On the other hand, in the impulse type, the movement of the line of sight is as shown in FIG. 12. Since the average brightness of only four pixels is not perceived as in the hold type, motion blur occurs. Instead, a clear moving image can be obtained on a CRT display.

[0007] From the above, it is important for the motion blur whether it is of the hold type or the impulse type. In the display of liquid crystal, the hold time of the display light can be shortened.
It has been found that motion blur can be improved by approaching an impulse-type display such as a CRT (refer to "Text P1 to P6" sponsored by the Liquid Crystal Society: LCD Forum, "How LCDs Enter the CRT Monitor Market").

On the other hand, K. Sueoka et al. ID
In RC'97 Digest p203, FIG.
(a) to (c), a method of intermittently turning on the backlight so as to show the transmissivity of the liquid crystal, the backlight intensity, and the passage of the transmitted light intensity over time, shortening the apparent hold time, and using the impulse type To improve the motion blur.

Further, in Japanese Patent Application Laid-Open No. H11-109921, a gate line is scanned twice in one frame, a black reset is written in one of them, and an image signal is written in the other gate line. By writing, the display light is made closer to the impulse type, and the motion blur is improved. This proposal also states that further improvement in image quality is expected by combining the black reset driving method and the intermittent lighting of the backlight.

As a method of intermittently turning on a backlight, as shown in FIG. 13, it is also applied to a field sequential method (Liquid Crystal Society of Japan: L
(See textbooks P7-P11), organized by CD Forum, 'How LCDs Enter the CRT Monitor Market'. In this method, after writing a data signal on the entire screen, the backlight is turned on with a time interval for completing the response of the liquid crystal.

Japanese Patent Application Laid-Open No. H11-109921 states that a further improvement in image quality is expected by combining the black reset driving method and the intermittent lighting of the backlight. Or not stated.

For example, as shown in FIG. 15, in the second scanning of the gate line, after writing a data signal to the pixel corresponding to the last gate line, an interval time is set for the liquid crystal to completely respond, and the backlight is turned on. Consider the case of lighting. In a general TFT liquid crystal panel, when displaying the same grayscale level on the pixel corresponding to the first gate line and the pixel corresponding to the gate line scanned last, the same voltage is applied. Also in this case, it is obvious that the same gradation level can be obtained by applying the same voltage, since the shaded areas in FIG. 15 have the same area.

However, if the response time of the liquid crystal becomes slower and the backlight is turned on before the liquid crystal of the pixel corresponding to the gate line scanned last completely responds, the backlight shown in FIG.
Since the shaded areas of Nos. 6 are different, it is understood that the gradation level of the pixel corresponding to the first gate line is different from the gradation level of the pixel corresponding to the gate line scanned last.

Further, as the backlight lighting period becomes shorter, the light emission pattern becomes more impulse-like, so that the motion blur of the moving image can be further improved. However, if it is extremely short, the brightness becomes darker. Therefore, the lighting period of the backlight is preferably about 70% to 20% of one frame. Further, considering the time required to scan the gate line twice in one frame, etc., the voltage is written to the pixel corresponding to the last line of the second scan of the gate line.
Period T _X until the backlight is better as short as possible.

In this case, the response time of the liquid crystal is fast,
The liquid crystal of the pixel corresponding to the gate line is T _XIf you respond within
The same gradation level can be obtained at the same voltage over the entire screen.
No problem. But T_XIs very short (e.g.
For example, 1 ms) or T_XIs 0, the liquid
It is impossible for the crystal to respond, in which case each gate line
If the same voltage is applied to the pixels corresponding to
The key level will not be obtained. FIG._XIs 0
did.

Japanese Patent Application Laid-Open No. Hei 7-31898 discloses a method of modulating a data voltage according to a distance from a data line driving unit to obtain uniform brightness in a screen. This method is used to eliminate unevenness in brightness between a place near the data line driving means and a place far from the data line driving means, which is caused by the distortion of the data voltage due to the electrode resistance. This has the effect that the brightness can be corrected without using a low-resistance member or the like for the electrode. In this method, the backlight is always turned on.

[0017]

In view of the above, in the present invention, when the backlight is turned on without complete response of the liquid crystal, the pixel corresponding to each gate line has a uniform level. It is an object of the present invention to provide a liquid crystal display device that displays a tone level.

In Japanese Patent Application Laid-Open No. Hei 7-318898, the brightness of the light at a place close to the data line driving means and at a place far from the data line driving means due to the distortion of the data voltage due to the electrode resistance is compared with the mode of the constant lighting of the backlight. While the data voltage is modulated to eliminate the non-uniformity, the present invention eliminates the non-uniformity of the luminance caused by the response of the liquid crystal in a mode in which the backlight is turned on and off during the period. Things. Also, even if liquid crystal with a slow response time is used,
It also has the effect of enabling a display having a uniform gradation level over the entire screen, which is essentially different from Japanese Patent Application Laid-Open No. Hei 7-31898.

[0019]

According to the present invention, there is provided a pixel cell having n gate lines and m data lines, the pixel cells being arranged in a matrix at the intersections of the gate lines and the data lines. A-th liquid crystal display element (a is 1 ≦ a
A selection signal to a gate line scanned at ≤n is applied at time ta, and _a b-th (b is b ≠ a and 1≤
A selection signal to the gate line (b ≦ n) is applied at time t _b , and the pixel cell C _a corresponding to the a-th gate line and the pixel cell C corresponding to the b-th gate line _b
In the liquid crystal display device which substantially turned off simultaneously light from the backlight incident to, the case of obtaining a substantially same luminance in the pixel cell C _a and the pixel cell C _b, the voltage level applied to the pixel cell C _a through the data line a voltage level different from the, by applying through the data line to the pixel cell C _b, a liquid crystal display device which substantially the same luminance is obtained in the pixel cell C _a and the pixel cell C _b.

Further, according to the present invention, the above-mentioned luminance is adjusted to a certain pixel value.
Le C_iBack when a certain voltage level is applied
Light emission period T_BLOf transmitted light intensity of pixel cell
Chemical I _i(T): a liquid crystal table which is a time integrated value of (t is time)
Display device.

According to the present invention, at the time of the first gate line scanning, a non-image signal different from the image signal having a predetermined potential is supplied from the data line, and at the time of the second gate line scanning, An image signal is supplied from the data line, and during the period T, the first scan of the plurality of gate lines, the second scan of the plurality of gate lines, backlight on and backlight off are sequentially performed, The time required to scan the last gate line from the first gate line is T
_g , the time from the end of the last gate line scan of the first plurality of gate line scans to the first gate line scan in the second plurality of gate line scans is T _Y , the second plurality of gate line scans time T _X from the time of the last gate line scanning end of the gate line scanning to when a backlight _lighting, when the time from the backlight on until off was T _BL, the period T _f of 1 frame, T f ₌ Y ₁ T, where T = 2T _g
+ T _Y + T _X + T _BL , and Y ₁ is a liquid crystal display device in which ₁ is an integer of 1 or more.

Further, the present invention is the liquid crystal display device, wherein the non-image signal is a black reset signal.

Further, the present invention is the liquid crystal display device, wherein the a-th gate line is a gate line which is scanned last in the second gate line scanning.

The present invention is a liquid crystal display device in which X ₁ = 0.7 to 0.2, where X ₁ = T _BL / T.

Further, the present invention is a liquid crystal display device wherein T _x = 0.

Further, according to the present invention, the time T _{Z% → o%} required for the transmittance of the liquid crystal to change from Z% to 0% is expressed by T
When _{Z% →} is _o% ≦ _{T g,} a _{T Y} = 0, and, T
_{When Z% → o%} > _Tg , _TY ≒ _{TZ% → o%} −T
a liquid crystal display device that modulates T _Y such that _g.

[0027]

Embodiments of the present invention will be described.
An embodiment of the liquid crystal display device of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory diagram of a configuration of a panel used in Examples 1 to 4. FIG. 2 is an explanatory diagram of a voltage-transmitted light intensity curve of the liquid crystal panel used in Examples 1 to 4. FIG. 3 is an explanatory diagram of the response time of the liquid crystal panel used in Examples 1 to 4. FIG. 4 is a diagram for explaining the timing of gate line scanning and backlight lighting of the liquid crystal panel used in Examples 2 to 4, and the change in transmitted light intensity of the liquid crystal. FIG. 5 is an explanatory diagram of luminance when the same voltage (0 V) is applied to the pixel corresponding to each gate line through the data line at the time of the second gate line scanning in the second embodiment. FIG. 6 is an explanatory diagram of the voltage applied through the data line so that the luminance of the pixel corresponding to each gate line becomes the same at the time of the second scanning of the gate line in the second embodiment. FIG. 7 shows a case where the voltage applied through the data line is adjusted based on FIG. 6 so that the luminance of the pixel corresponding to each gate line becomes the same during the second gate line scanning in the second embodiment. FIG. 4 is an explanatory diagram of a luminance level of FIG. FIG. 8 is an explanatory diagram of the luminance level when 3.3 V is applied to the pixel corresponding to each gate line through the data line in the third embodiment.

The liquid crystal display of the present invention will be described.
As shown in FIG. 1, a gate line driving circuit and a data line driving circuit are connected to a liquid crystal panel. This liquid crystal panel is 2
It has forty gate lines and 320 data lines, and is composed of pixel cells arranged in a matrix corresponding to the intersections of the gate lines and the data lines. A thin film transistor is formed. In this embodiment, only one thin film transistor is formed for each pixel, but a plurality of thin film transistors may be formed. Rubbing is performed on the upper and lower substrates constituting the liquid crystal panel so that the rubbing directions are antiparallel, and the liquid crystal is injected with E8 (manufactured by Merck) which is a nematic liquid crystal.
The rubbing direction is set between the two polarizing plates whose polarization axes are orthogonal to each other so that the rubbing direction forms an angle of 45 degrees from the polarization axis. A backlight is installed behind the polarizing plate, and the timing of driving is measured, and the backlight is turned on. In the liquid crystal display device, the a-th (a is 1 ≦ a ≦ n becomes an integer) is applied to the selection signal to the gate lines are scanned in the time t _a, the b-th (b is b ≠ a
And a selection signal to the gate line (1 ≦ b ≦ n) is applied at time t _b , and the pixel cell C _a corresponding to the a-th gate line and the b-th gate line substantially illuminated turned off simultaneously light from the backlight incident on the pixel cell C _b corresponding to.

FIG. 2 shows the transmitted light intensity when a voltage is applied to this panel. FIG. 3 shows the response time of the liquid crystal of this panel.

Embodiment 1 will be described. Liquid crystal display of this embodiment
The device comprises a pixel cell C_aAnd pixel cell C _bThrough the data line
The voltage level applied to the pixel cell C_aAnd pixel cell C
_bVoltage level adjusted to obtain approximately the same brightness at
Adjustment means is provided. In addition, the liquid crystal panel used in this embodiment is
In the case of the cell, when 11 V is applied, black display is performed, and the 0 V mark is displayed.
In addition, it becomes the brightest state.

In this panel, the display one frame before
The state is a certain gradation level (for example, 0% black state in FIG. 3).
Two pixel cells C_a, C_bBut the different a-th
Connected to the gate line and the b-th gate line,
Pixel cell C_a, C_bThe backlight corresponding to the
When lit, the a-th gate line is in the selected state
Time T_aAnd the time when the b-th gate line is in the selected state
T_bDifference (T_a-T _b) Is 10% of the liquid crystal response time in FIG.
And the b-th gate line is selected.
Time T_bFrom the backlight corresponding to the two pixels
Time T when it started to light_cDifference (T_c-T_b) Is FIG.
If the liquid crystal response time is shorter than the
Pixel cell C added_a, C_bTo obtain the same brightness at
I can not do such a thing. Here, the luminance is a certain pixel cell C
_iWhen a certain voltage level is applied to the backlight
G light emission period T_BLChange in transmitted light intensity of pixel cell at
_i(T): Time integration value of (t is time).

Therefore, the liquid crystal display device of the present embodiment is provided with voltage level adjusting means, and supplies different voltage levels to the pixels of the same gradation level corresponding to the different gate lines, so that the brightness level is adjusted. Differences can be corrected.

Embodiment 2 will be described. Second embodiment of the present invention
For example, scanning all gate lines twice in one frame
In the first gate scan, the LCD panel is reset to black.
, That is, 11V is applied to all the gate lines through the data lines.
Applied to the corresponding pixel, and it becomes the brightest state in the second time
0V to the pixels corresponding to all the gate lines through the data lines
Apply. The liquid crystal display device of the present embodiment has
_{Z% → 0%}> T_gIn the case of_Y≒ T_{Z% → 0%}-T
_gT so that_YScanning interval adjusting means for adjusting
ing. Also, during the cycle period T, the first plurality of games
Line scanning, second multiple gate line scanning, back
Turn on the light and turn off the backlight sequentially, the first
When it takes to scan the last gate line from the first gate line
T between_gLast gate of the first multiple gate line scan
From the end of scanning the gate line to the second scanning of multiple gate lines.
And the time until the gate line is first scanned is T_Y,
End of last gate line scan of second multiple gate line scan
The time from when the backlight turns on is T_X, Backlight
T is the time from turning on to turning off_BLAnd one frame
Period T_fIs T_f= Y₁T where T = 2T_g+ T_Y+ T_X+ T_BL  And Y₁Is an integer of 1 or more. Also, X₁= T
_BL/ T as X₁= 0.7 ~ 0.2 is preferred
New In the present embodiment, Y₁= 1.

The time for scanning the gate, the timing for turning on the backlight, the time for responding to the liquid crystal, and the like are as shown in FIG. 4. In the second gate line scanning, the last gate line is scanned. There time T _X from being scanned, until the backlight is turned is set to 0.

In the first scanning of a plurality of gate lines,
The second multiple gate lines from the end of subsequent gate line scanning
Time T until the gate line is first scanned in scanning
_YIs set to 0. In the liquid crystal panel used in this embodiment,
As shown in FIG. 3, a certain gradation level (transmissivity Z of liquid crystal)
%) To a black state (0%)._{Z% →
0%}Is the time T during which all the plurality of gate lines are scanned.
_g(= 3ms)
Absent. And T_{Z% → 0%}> T_gIn the case of T_Y≒ T_{Z% → 0%}-T_g  Ty can be adjusted so that

Next, FIG. 5 shows the luminance in one frame of the pixel corresponding to each gate line in the case of the timing chart shown in FIG. From this figure, it can be seen that when the same voltage level (0 V) is applied through the data line, the same gradation level cannot be obtained over the entire screen.

In order to match the brightness level of the dotted line in FIG. 5, that is, the brightness level of the pixel corresponding to the gate line to be scanned last, in the first gate scan, the liquid crystal panel is reset to black, that is, 11V is applied to all gates. A voltage was applied to the pixel corresponding to the line through the data line, and in the second scan of the gate line, the voltage applied through the data line was changed for each pixel corresponding to each gate line as shown in FIG. As a result, the obtained luminance was a constant luminance level over the entire screen as shown in FIG. This luminance level is the maximum gradation level of this panel.

As described above, in the second scanning of the gate line, the luminance level when a certain voltage V is applied to the pixel corresponding to the gate line scanned last through the data line is used as a reference. By setting the voltage level V ′ applied through the data line to a certain value to the pixel corresponding to the gate line, the same luminance level can be obtained.

[0039] In the second embodiment, in the second round of the gate line scanning, the last gate line is scanned, the time T _X until the backlight is turned indicates only the case of a 0. However, when the same voltage is applied to the pixel corresponding to each gate line through the data line and the luminance is different, the method as in the present embodiment is effective. Even when _TX is other than 0, the method according to the present embodiment is effective. It goes without saying that such a method is applied.

Embodiment 3 will be described. In the present embodiment, in the first gate scan in the second embodiment,
A black reset is applied to the liquid crystal panel, that is, 11 V is applied to the pixels corresponding to all the gate lines, and in the second gate line scanning, 3.3 V, which is 10% luminance in FIG. 11, is applied to the pixels corresponding to all the gate lines. Applied through the data line.
At this time, the luminance of the pixel corresponding to each gate line in one frame period is as shown in FIG.

Now, when trying to obtain 256 gradations with this panel, with the level of the dotted line in FIG. 5 as the maximum luminance, FIG.
It has been found that the difference between the luminance of the first pixel and the luminance of the last scanned pixel falls within the gradation error range.
From this, it can be seen that at a certain gradation level, a constant gradation level can be obtained for the entire screen even when a constant voltage is applied to the entire screen.

Embodiment 4 will be described. Lighting time of backlight is 80% to 10% of 1 frame (16.6 ms)
Changed. At this time, if the lighting period is about 80%,
No noticeable improvement in motion blur was observed, but when the lighting period reached 70%, the improvement in motion blur gradually became recognizable. When the lighting period was further shortened, motion blur became almost unrecognizable,
When the lighting period was less than 20%, the brightness of the entire screen was lowered, resulting in a dark screen. In this case, the light amount of the backlight may be increased, but it is not appropriate in consideration of power consumption. Therefore, the lighting period of the backlight is 70
% To 20% has been found to be good.

As described in each of the embodiments, the gate line scanning is performed twice during the period. In the first gate line scanning, a non-image signal is supplied from the data line, and the second gate line scanning is performed. In line scanning, an image signal is supplied,
In the system in which the backlight is turned on after the end of the second gate line scan, if the backlight is turned on before the response of the liquid crystal is completed, a certain gate line will be It has been found that the same luminance level can be obtained by applying different voltages through the data lines to the pixel to be operated and the pixel corresponding to a certain gate line. As a result, this system can be used even when the response time of the liquid crystal is long, and the backlight lighting period can be shortened from the end of the second gate line scanning.

[0044]

According to the present invention, a liquid crystal display device which displays a uniform gradation level in a pixel corresponding to each gate line, when a backlight is turned on without complete response of liquid crystal. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view of a liquid crystal display device used in Examples 1 to 4.

FIG. 2 shows a voltage of a liquid crystal panel used in Examples 1 to 4.
FIG. 4 is an explanatory diagram of a transmitted light intensity curve.

FIG. 3 is an explanatory diagram of a response time of the liquid crystal panel used in Examples 1 to 4.

FIG. 4 is a diagram for explaining timing of gate line scanning and backlight lighting of a liquid crystal panel used in Examples 2 to 4, and a change in transmitted light intensity of liquid crystal.

FIG. 5 is an explanatory diagram of luminance when the same voltage (0 V) is applied to a pixel corresponding to each gate line through a data line during the second scanning of the gate line in the second embodiment.

FIG. 6 is an explanatory diagram of a voltage applied through a data line so that the luminance of a pixel corresponding to each gate line becomes the same at the time of the second gate line scanning in the second embodiment.

FIG. 7 illustrates a case where the voltage applied through the data line is adjusted based on FIG. 6 so that the luminance of the pixel corresponding to each gate line is the same during the second scanning of the gate line in the second embodiment. FIG. 4 is an explanatory diagram of a luminance level.

FIG. 8 is an explanatory diagram of a luminance level when 3.3 V is applied to a pixel corresponding to each gate line through a data line in a third embodiment.

FIG. 9 is an explanatory diagram of a hold-type display light pattern.

FIG. 10 is an explanatory diagram of an impulse-type display light pattern.

FIG. 11 is an explanatory diagram of the principle of a hold-type motion blur.

FIG. 12 is an explanatory diagram of a principle in which no motion blur occurs in the impulse type.

FIG. 13 is an explanatory diagram of a backlight lighting method.

FIG. 14 is an explanatory diagram of a time chart of a field sequence.

FIG. 15 is an explanatory diagram of a time chart when the backlight is turned on after the liquid crystal has completely responded.

FIG. 16 is an explanatory diagram of a time chart of turning on a backlight before a response of a liquid crystal is completely completed.

Continued on the front page (72) Inventor Tomoaki Furukawa 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Nobuyuki Ito 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp Corporation (72) Inventor Koji Numao 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka F-term in Sharp Corporation (reference) 2H093 NA16 NA43 NA53 NC34 NC44 ND06 ND34 NE10

Claims (8)

[Claims] 1. A semiconductor device comprising n gate lines and m data lines.
Corresponding to the intersection of the gate line and the data line.
A liquid crystal display element consisting of pixel cells arranged in a
Scan at the a-th position (a is an integer satisfying 1 ≦ a ≦ n)
The selection signal to the gate line to be_aTo the b-th
(B is b ≠ a and an integer satisfying 1 ≦ b ≦ n)
Select signal to the line at time t_bAnd the a-th
Cell C corresponding to the gate line of_aAnd the b-th game
Pixel cell C corresponding to the scanning line_bOf the backlight entering the
In a liquid crystal display device that turns on and off light almost simultaneously, a pixel cell C_aAnd pixel cell C_bAt the same brightness
The pixel cell C through the data line._aApplied to
A voltage level different from the voltage level _bTo day
The pixel cell C_aAnd pixels
Cell C_bIs characterized in that approximately the same brightness can be obtained in
Liquid crystal display device. 2. The brightness of a pixel cell C_iIt is in
Backlight emission period when voltage level is applied
T_BLChange in transmitted light intensity of pixel cell at _i(T):
2. The liquid crystal display according to claim 1, wherein (t is time) is a time integral value.
Indicating device. 3. The liquid crystal display device according to claim 1, wherein
At the time of the first gate line scanning, a predetermined voltage is applied from the data line.
A non-image signal different from the image signal having the
Also, during the second scan of the gate line, the image is
While the image signal is supplied, the first time
Scan multiple gate lines, second multiple gate lines
Scanning, backlight on and backlight off
Scan from the first gate line to the last gate line.
The time it takes to_g, First multiple gate line runs
The second multiple gates from the end of the gate line scan at the end of the inspection
Gate line scanning until the gate line is first scanned
Time T_YThe last gate of the second multiple gate line scan
T is the time from the end of scanning the
_X, The time from backlight on to off is T_BLage
, One frame period T_fIs T_f= Y₁T where T = 2T_g+ T_Y+ T_X+ T_BL  And Y₁Is a liquid characterized by being an integer of 1 or more
Crystal display device. 4. The liquid crystal display device according to claim 3, wherein the non-image signal is a black reset signal. 5. The liquid crystal display device according to claim 3, wherein the a-th gate line is a gate line scanned last in a second gate line scan. 6. Assuming that X ₁ = T _BL / T, X ₁ = 0.7 to
6. The liquid crystal display device according to claim 3, which is 0.2. 7. The liquid crystal display device according to claim 3, wherein T _X = 0. 8. Until the transmittance of the liquid crystal changes from Z% to 0%
Time T required_{Z% → 0%}But T_{Z% → 0%}≤T_g, T_Y= 0 and T_{Z% → 0%}> T_g, T_Y≒ T_{Z% → 0%}-T_g T so that_YAdjust
The liquid crystal display device according to claim 3.