KR20170080319A - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display device according to the present invention includes a data driver, wherein the data driver supplies a data voltage inverted every two dots, and the odd-numbered When switching from the frame to the even-numbered frame, the polarity of the data voltage is shifted in the row direction by i dots (i is 1 or 2), and when the polarity of the data voltage is switched from the even- The data driver changes the horizontal 1-dot inversion driving method and the horizontal 2-dot inversion driving method when switching from the odd-numbered frame to the even-numbered frame, and switches from the even-numbered frame to the odd- The polarities of the data voltages in the odd-numbered frames are all converted, and the polarity of the data voltages in the odd- Or applies a data voltage of the opposite polarity to the applied data voltage in the subsequent four frames.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display device capable of reducing scarring after-images and flicker.

The image display device that realizes various information on the screen is a core technology of the information communication age and it is becoming thinner, lighter, more portable and higher performance. Accordingly, a flat panel display device capable of reducing weight and volume, which is a disadvantage of a cathode ray tube (CRT), has attracted attention.

Particularly, liquid crystal display devices are widely used in various fields such as TV, mobile, monitor, and automobile equipment.

Such a liquid crystal display device includes a liquid crystal display panel for displaying an image, and the liquid crystal display panel includes a liquid crystal layer between a lower substrate and an upper substrate.

Each sub-pixel included in the liquid crystal display panel has a pixel electrode and a common electrode. When the data voltage is applied to the pixel electrode, the angle of the liquid crystal is changed by the electric field formed between the pixel electrode and the common electrode to adjust the light transmittance.

On the other hand, there is a problem that when the data voltage of the same polarity is continuously applied to the liquid crystal, it is deteriorated. In order to prevent deterioration of the liquid crystal, frame inversion driving for changing the polarity of the data voltage applied to the liquid crystal in each frame or n dot inversion driving for changing the polarity of the data voltage applied to the pixel electrode every n dots is performed.

1A shows a conventional horizontal two-dot inversion driving method.

On the other hand, when the polarity of the data voltage is inverted for each horizontal display line and horizontal one-dot inversion driving is performed, the same polarity is not repeated at frame switching, and flicker can be reduced.

However, by repeating the image of a specific pattern, for example, by 8 pixels per second and repeating every 4n + kth frame (n is a natural number and k is a natural number between 1 and 3), a data voltage applied to a specific sub- It becomes dominant in one polarity, and a scarring after-image may occur.

That is, the polarity of the data voltage applied to the subpixels arranged in C1 to C4 in the first frame is "+ + - - ", and the polarity of the data voltage applied to the subpixels arranged in C1 to C4 in the 5th frame is "+ + - -". According to this, a data voltage of the same polarity is applied to each of the subpixels, and the polarity is biased to either side, resulting in a scrolling afterimage.

In addition, an inversion driving method for solving such a scrolling residual image has also appeared.

1B is a diagram showing an inversion driving method for resolving a scrolling residual image.

Referring to FIG. 1B, the polarities of the data voltages in the first frame and the fifth frame are all inverted. Therefore, it is possible to prevent a scrolling after-image caused by a specific pattern image repeated every 4n + kth frame and moving at 8 pixels per second.

However, a data voltage of the same polarity is applied to all the subpixels at the time of conversion from 8n-6th to 8n-5th frame and at 8n-2th frame at 8n-1th frame. At this time, when the data voltage of the same polarity is maintained in the subsequent frame, there is a problem that the flickering phenomenon which is flickering is recognized by the user.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a liquid crystal display device capable of reducing the afterglow of scrolling and the flicker phenomenon.

In order to achieve the above object, a liquid crystal display device according to the present invention includes a data driver, and the data driver includes a data voltage inverting driving method for switching from an odd-numbered frame to an even-numbered frame, The inverting drive method of the data voltage is changed at the time of switching.

When switching from an odd-numbered frame to an even-numbered frame, the data driver shifts the polarity of the data voltage in the row direction by i dots (i is 1 or 2) The polarity of the data voltage is shifted in the row direction by 3-i dots and supplied.

When switching from an odd-numbered frame to an even-numbered frame, the data driver changes the horizontal 1-dot inversion driving method and the horizontal 2-dot inversion driving method, and when switching from an even- The polarity of the voltage is all converted, and the data voltage of the opposite polarity to the data voltage applied in the previous four frames is applied in units of four frames.

The liquid crystal display according to the present invention may be configured such that the inversion driving method of the data voltage at the time of switching from the odd-numbered frame to the even-numbered frame and the inversion driving method of the data voltage at the switching from the odd- It is possible to reduce the afterglow of scrolling. In addition, the subpixels to which the data voltage of the same polarity is applied are dispersed, and the flicker recognized by the user can be reduced.

FIG. 1A is a view for explaining a general reversal driving mode in a conventional liquid crystal display device, and FIG. 1B is a view for explaining a reversal driving mode for preventing a scrolling after-image in a conventional liquid crystal display device.
2 is a configuration diagram showing a configuration of a liquid crystal display device according to the present invention.
FIGS. 3A to 3C are views for explaining an inversion driving method of the liquid crystal display according to the first embodiment of the present invention.
FIGS. 4A and 4B are diagrams for explaining the inversion driving method of the liquid crystal display according to the second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram showing a configuration of a liquid crystal display device according to the present invention.

The liquid crystal display device shown in FIG. 2 includes a liquid crystal display panel PN, a gate driver GD, a data driver DD, and a timing controller TC.

The liquid crystal display panel PN includes a plurality of subpixels PXL defined by intersecting a plurality of data lines DL, a plurality of gate lines, each data line DL and each gate line GL .

The plurality of subpixels PXL includes a pixel electrode and a common electrode, receives a data voltage from each data line, and adjusts a light transmittance of the liquid crystal by an electric field formed between the pixel electrode and the common electrode, Express.

The timing controller TC controls the data driver DD and the gate driver GD for this purpose. For this purpose, the timing controller TC is controlled by the horizontal synchronization signal Hsync, the vertical synchronization signal Vsync, the data enable DE, And generates the data control signal DCS and the gate control signal GCS using the signal CLK.

The timing controller TC supplies the gate control signal GCS to the gate driver GD. And arranges the image data R, G and B data inputted from the external system in accordance with the configuration of the liquid crystal display panel PN and outputs the aligned image data R, To the data driver (DD).

In addition, the timing controller TC generates the polarity control signal POL and the option control signal OPT and supplies it to the data driver DD. The option control signal OPT consisting of HH, HL, LH or LL is converted on a frame unit basis as a signal for changing the inverted driving form of the data driver DD and the polarity control signal POL is a polarity control signal The logic is switched for each horizontal display line. This will be described later.

The gate control signal GCS includes a gate start pulse SSP, a gate shift clock SSC and a gate output enable SOE. The data control signal DCS includes a dot clock DC, (SCC), a source enable signal (SE), a polarity reversal signal (POL), and the like.

The gate driver GD includes a shift register for generating a scan pulse in response to a gate start pulse input from the timing controller TC and a level shifter for shifting the voltage of the scan pulse to a voltage level suitable for driving the subpixels . And supplies a gate pulse to the gate line GL in accordance with the gate control signal GCS input from the timing controller TC.

The data driver DD converts the video data RGB Data received from the timing controller TC into data voltages of positive and negative polarity according to the data control signal DCS and the option control signal, DL.

The data driver has an inverting drive option terminal, and the inverting drive mode can be changed in accordance with the option control signal from the timing controller inputted to the inverting drive option terminal.

Table 1 shows one example of a data driver including an option function capable of changing the inverted driving mode according to the option control signal input to the inverting driving option terminal of the data driver.

According to Table 1, the option control signal consists of four HH, HL, LH, and LL signals and may be any other name.

1 CH to 8 CH represent eight consecutive sub-pixels among the sub-pixels arranged on one horizontal display line.

That is, when the option control signal is HH, "+ - - + - + + -" polarity signals are applied to eight consecutive sub-pixels among the sub-pixels arranged on one horizontal display line.

If only the polarity control signal is reversed in polarity, when the option control signal is HH, "- + + - + - - +" is added to eight consecutive subpixels among the subpixels arranged on one horizontal display line. The polarity signal of?

 When the option control signal is supplied from the timing controller to the optional terminal of the data driver DD in units of frames by LL-LL-HL-HL, data applied to four sub pixels continuously arranged on a specific horizontal display line The polarity of the voltage is "+ - + -", "+ - + -", "+ - +" and "+ - +". When the option control signal is supplied in a repetition of LL - LL - HL - HL in units of four frames, a polarity control signal inverted for each horizontal display line in accordance with each stage is supplied to a specific horizontal display line in HLHL in units of frames , The inversion driving method shown in FIG. 4B can be implemented.

On the other hand, the polarity of the data voltage outputted according to the option control signal is only one example, and can be changed.

The inverted drive mode shown in Figs. 3A to 4B is repeated for every eight horizontal display lines, and the polarity of the data voltages of the four horizontal display lines is opposite to the polarity of the data voltages of the previous or subsequent four horizontal display lines As shown in FIG.

The polarity change of the data voltage on the 8n-4th frame in the 8n-7th frame (n is a natural number) is included in the optional function of HH-HL-LH-LL of the data driver DD, The polarity control signal of the same logic is input on the line and the polarity control signal of the inverted logic for the next four frames is inputted on the specific horizontal display line.

For example, in order to implement the inverted drive mode shown in FIG. 3A, the optional function of the data driver DD is "++ -" when HH, "- ++" , "+ - +" for LL, and "- ++ -" for LL. And the polarity control signal whose logic is inverted for each horizontal display line is set to be input to the subpixels arranged on the specific horizontal display line for the same logic for four frames.

Hereinafter, the inverse driving will be described in detail.

In the inversion driving method of the liquid crystal display according to the first and second embodiments, the inversion driving method of the data voltage when switching from the odd-numbered frame to the even-numbered frame and the inversion driving method of the data voltage when switching from the odd- And is driven in a different manner.

On the other hand, since the polarity control signal is inverted for each horizontal display line, the inverted drive mode of the first and second embodiments changes the inverted drive mode in the horizontal direction while maintaining the vertical one dot inversion drive.

By varying the driving method, it is possible to halve the application of the voltage of the same polarity to each sub-pixel, halving the flicker phenomenon, and reduce the afterimage of the scribe except for the image of the pattern repeated for every 8n-th frame .

3A to 3C are diagrams illustrating polarities of a data voltage according to a frame change of the liquid crystal display according to the first embodiment of the present invention.

As shown in FIGS. 3A to 3C, the liquid crystal display according to the first embodiment performs horizontal two-dot inversion driving, and when switching from the odd-numbered frame to the even-numbered frame, the polarity of the data voltage is i- Or 2), and when switching from the even-numbered frame to the odd-numbered frame, the polarity of the data voltage is shifted by 3-i dot to supply the data voltage.

FIG. 3A shows an inverted drive mode when i is 2, and FIG. 3B is a diagram showing the inverted drive mode shown in FIG. 3A in a frame-by-frame manner.

Referring to FIGS. 3A and 3B, the data driver DD shifts the polarity of the data voltage by two dots when switching from an odd-numbered frame to an even-numbered frame, The polarity of the voltage is shifted by one dot to supply the data voltage. On the other hand, as shown in Fig. 3A, one dot inversion driving is performed in the vertical direction, and the inverted driving type is converted in the horizontal direction.

As shown in FIG. 3A, in the sub-pixels C1 to C4 located on the horizontal display line, "+ + - -", "- - + +", "+ - + + -, "" - - + + "," + + - - "," - + + - "and" + - - + "are repeated.

Hereinafter, it is assumed that n is 1, and flicker and scrolling after-image are described.

When switching from the odd-numbered frame to the even-numbered frame, that is, when switching from the first frame to the second frame, switching from the third frame to the fourth frame, switching from the fifth frame to the sixth frame The flicker phenomenon does not occur because the polarity of the data voltage is completely changed when the seventh frame to the eighth frame is switched.

On the other hand, when switching from the even-numbered frame to the odd-numbered frame, that is, from the second frame to the third frame, the transition from "- - + +" to "+ - - +" is made. As a result, the polarities of the sub-pixels of C2 and C4 do not change. While the polarities of the subpixels of C1 and C3 change.

When switching from the 4th frame to the 5th frame, it is switched to "- + + -" and "- - + +". As a result, the polarities of the data voltages of the sub pixels of C1 and C3 do not change, and the polarities of the data voltages of the sub pixels of C2 and C4 change.

As a result, when switching from the odd-numbered frame to the even-numbered frame, the data voltage polarities of the subpixels are all changed, and when switching from the even-numbered frame to the odd-numbered frame, 50% of the subpixels do not change the data voltage polarity. Overall, 25% of the subpixels maintain the data voltage polarity and thus reduce flicker.

When switching from an even-numbered frame to an odd-numbered frame, half of the subpixels on the horizontal display line are maintained and the flicker is dispersed, so that it is difficult for the user to recognize the flicker than when the polarity of all the subpixels on the horizontal display line is maintained.

In order to compare the effects according to the first embodiment of the present invention, it is also possible to distinguish between switching from an odd-numbered frame to an even-numbered frame and switching from an even-numbered frame to an odd- Let's look at the case of shifting by dots.

The polarity of the data voltages applied to C1 to C4 is changed only by half when switching from one frame to two frames. When switching from two frames to three frames, the polarity is changed by half when switching from three frames to four frames. The polarity of the data voltage of about 50% is not changed.

Therefore, when switching from the odd-numbered frame to the even-numbered frame and the switching from the even-numbered frame to the odd-numbered frame are distinguished and the inversion driving method is different, flicker occurring when not distinguishing can be halved.

From the viewpoint of the scrolling residual image, it can be confirmed that the scrolling after-image is not generated because the polarity is inverted in the C1 to C4 subpixels since it is "++ -" in one frame and "- ++"

3C shows an inverted drive mode when n is 1.

That is, the data driver DD shifts the polarity of the data voltage by one dot when switching from the odd-numbered frame to the even-numbered frame and supplies the polarity of the data voltage by two dots when switching from the odd- And supplies the data voltage.

"+ + - -", "+ + -", "+ - - +", "+ + - -", and "-" are displayed in each of the sub- + + "," + - - + "," - + + - "and" - - + + "are repeated.

From the viewpoint of the scrolling residual image, it can be confirmed that the scrolling after-image is not generated because the polarity is inverted in the C1 to C4 subpixels since it is "++ -" in one frame and "- ++"

From the point of view of flicker, only the reversal drive format and the order shown in Fig. 2A are changed. Therefore, only the data voltage of 25% maintains the same polarity.

That is, the inverted drive modes shown in Figs. 3A and 3B have the same effect.

Figs. 4A and 4B show an inverted drive mode according to a second embodiment of the present invention.

4A and 4B, the reverse 1-dot inversion driving mode and the horizontal 2-dot inversion driving mode are mixed.

As shown in FIGS. 4A and 4B, in the liquid crystal display according to the second embodiment, horizontal 1-dot inversion driving and horizontal 2-dot inversion driving are mixed, and when switching from an odd- The polarity of the data voltage is reversed when switching from the even-numbered frame to the odd-numbered frame. Then, data voltages of the opposite polarity to the data voltages applied in the previous four frames are applied in units of four frames.

By varying the driving method, it is possible to halve the application of the voltage of the same polarity to each sub-pixel, halving the flicker phenomenon, and reduce the afterglow of the scrolling.

The reversal drive mode shown in FIG. 4A will be described first.

During the 8n-7 frame period (n is a natural number), the positive data voltage is applied to the subpixels located in the odd-numbered columns in the odd-numbered rows, and the application of the negative data voltage to the subpixels located in the odd- do. During the 8n-6 frame period, the data voltage of the polarity opposite to the polarity of the voltage applied to the subpixel during the 8n-7 frame period is applied, and during the 8n-5 frame period, And the subpixels located in the 4i-1 and 4i-2 columns are applied with the negative data voltage. During the 8n-4 frame period, the data voltage of the polarity opposite to the polarity of the voltage applied to the subpixel during the 8n-5 frame period is applied, and during the 8n-3 frame period, A data voltage having the opposite polarity to the voltage applied to the subpixel is applied. During the 8n-2 frame period, the data voltage of the opposite polarity to the voltage applied to the sub-pixel during the 8n-6 frame period is applied, and during the 8n-1 frame period, A data voltage of the opposite polarity to the voltage applied to the pixel is applied, and during the eighth n-th frame period, a data voltage of the opposite polarity to the voltage applied to the sub-pixel during the eighth n-

Namely, if the polarity of the data voltages applied to the C1 to C4 is 1 to 8 frames when i is 1 and n is 1, then "+ - + -", "- + - +" + - - "," - - + "," - + - + "," + - + -

The polarity of the data voltage applied to C1 to C4 at the time of the first frame is "+ - + - ", and the polarity of the data voltage applied to C1 to C4 at the time of the fifth frame is" - + "because they are different from each other.

When switching from the odd-numbered frame to the even-numbered frame, the voltage of the same polarity is not held, and when switching from the even-numbered frame to the odd-numbered frame, that is, from the 8n- The polarities of the data voltages applied to the sub-pixels arranged at C2 and C3 do not change. In addition, the polarities of the data voltages applied to the sub-pixels arranged in C1 and C4 are not changed when the 8n-3th frame is switched from the 8n-4th frame. Since the number of pixels maintaining the same polarity is halved only when switching from an even-numbered frame to an odd-numbered frame, the flicker is reduced to 25%. In addition, the four pixels arranged in C1 to C4 are dispersed without being maintained at the same voltage at the same time during frame switching, and the flicker is not recognized by the user.

Hereinafter, the reversal drive mode shown in FIG. 4B will be described.

During the 8n-7 frame period (n is a natural number), the positive data voltage is applied to the subpixels located in the odd-numbered columns in the odd-numbered rows, and the application of the negative data voltage to the subpixels located in the odd- do. During the 8n-6 frame period, the data voltage of the polarity opposite to the polarity of the voltage applied to the subpixel during the 8n-7 frame period is applied, and during the 8n-5 frame period, A positive data voltage is applied to the subpixel in column 3 (i is a natural number) and the column 4i, a negative data voltage is applied to the subpixel in the column 4i-2 and the column 4i-1 in the odd column, During the eighth-7th frame period, the data voltage of the polarity opposite to the polarity of the voltage applied to the subpixel during the 8n-5 frame period is applied. During the 8n-3 frame period, The data voltage of the opposite polarity to the voltage applied to the subpixel during the 8n-6 frame period is applied during the 8n-2 frame period, and the data voltage of the eighth n- During the frame period, A data voltage of the opposite polarity to the voltage applied to the subpixel is applied during the eighth frame period and during the eighth frame period and the data voltage of the opposite polarity to the voltage applied to the subpixel during the eighth n- .

Namely, if the polarity of the data voltages applied to the C1 to C4 is 1 to 8 frames when i is 1 and n is 1, then "+ - + -", "- + - +" - - "," - + - "," - + - + "," + - + - "," - + + -

The polarity of the data voltage applied to C1 to C4 at the time of the first frame is "+ - + - ", and the polarity of the data voltage applied to C1 to C4 at the time of the fifth frame is" - + "because they are different from each other.

When switching from the odd-numbered frame to the even-numbered frame, the voltage of the same polarity is not held, and when switching from the even-numbered frame to the odd-numbered frame, that is, from the 8n- The polarities of the data voltages applied to the sub-pixels arranged at C3 and C4 are not changed. In addition, the polarities of the data voltages applied to the sub-pixels arranged in C1 and C2 are not changed when the 8n-3th frame is switched from the 8n-4th frame. When the flicker is switched from the even-numbered frame to the odd-numbered frame, since the pixels maintaining the same polarity are half of the pixels arranged in C1 to C4, the flicker is reduced to 25%. In addition, the four pixels arranged in C1 to C4 are dispersed without being maintained at the same voltage at the same time during frame switching, and the flicker is not recognized by the user.

As described above, in the liquid crystal display according to the first and second embodiments of the present invention, when the odd-numbered frame is switched to the even-numbered frame, the data voltage is inverted and the odd- It is possible to reduce the afterimage of scrolling that occurs in a specific pattern by changing the inversion driving method of the time data voltage. In addition, the subpixels to which the data voltages of the same polarity are applied are dispersed to reduce the flicker recognized by the user

The foregoing description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention. Accordingly, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

PN: liquid crystal display panel DD: data driver
GD: Gate driver TC: Timing controller
PXL: Subpixel

Claims (6)

A liquid crystal display panel having a plurality of sub-pixels in a matrix form;
A data driver for setting the inverted driving method of the data voltage when switching from the odd-numbered frame to the even-numbered frame and the inverted driving method of the data voltage when switching from the even-numbered frame to the odd-numbered frame differently according to the polarity control signal and the option control signal; And
And a timing controller for generating the polarity control signal whose logic is inverted for every one horizontal display line and for supplying the polarity control signal to the data driver, wherein the polarity control signal changes the inversion driving mode of the data driver in units of one frame period, . The method according to claim 1,
Each of the data lines is disposed on one side of each of the subpixels,
Wherein each of the subpixels receives a data voltage from each data line disposed on one side of each of the subpixels. 3. The method of claim 2,
The data driver may include:
A data voltage inverted every two dots is supplied,
Numbered frame to the even-numbered frame, the polarity of the data voltage is shifted and supplied in the row direction by i dots (i is 1 or 2)
And shifting the polarity of the data voltage in the row direction by 3-i dots when switching from an even-numbered frame to an odd-numbered frame. 3. The method of claim 2,
The data driver may include:
When switching from the odd-numbered frame to the even-numbered frame, the horizontal 1-dot inversion driving method and the horizontal 2-dot inversion driving method are changed to each other,
Numbered frame to the odd-numbered frame, all of the polarities of the data voltages in the odd-numbered frame are converted,
And applies a data voltage having an opposite polarity to the data voltage applied in the previous four frames in units of four frames. 5. The method of claim 4,
During the 8n-7 frame period (n is a natural number), the positive data voltage is applied to the subpixels located in the odd-numbered columns in the odd-numbered rows, and the application of the negative data voltage to the subpixels located in the odd- And,
During the 8n-6 frame period, a data voltage having a polarity opposite to the polarity of the voltage applied to the subpixel during the 8n-7 frame period is applied,
During the 8n-5 frame period, the positive polarity data voltage is applied to the 4i-3 column (i is a natural number) and the 4i column in the odd-numbered row, and the positive data voltage is applied to the 4i-2 column and the 4i-1 column A negative data voltage is applied to the subpixel,
During the 8n-4 frame period, a data voltage having a polarity opposite to the polarity of the voltage applied to the subpixel during the 8n-5 frame period is applied,
During a (8n-3) -th frame period, a data voltage having an opposite polarity to the voltage applied to the subpixel during the (8n-7)
During a (8n-2) -th frame period, a data voltage having an opposite polarity to the voltage applied to the sub-pixel during the (8n-6)
During a (8n-1) -th frame period, a data voltage having an opposite polarity to a voltage applied to the sub-pixel during the (8n-5)
And a data voltage having an opposite polarity to the voltage applied to the sub-pixel during the eighth (n-4) -th frame period is applied during the eighth frame period. 5. The method of claim 4,
During the 8n-7 frame period (n is a natural number), the positive data voltage is applied to the subpixels located in the odd-numbered columns in the odd-numbered rows, and the application of the negative data voltage to the subpixels located in the odd- And,
During the 8n-6 frame period, a data voltage having a polarity opposite to the polarity of the voltage applied to the subpixel during the 8n-7 frame period is applied,
During the 8n-5 frame period, the positive polarity data voltages are applied to the subpixels located in the 4i-3th column and the 4i-2th column in the odd-numbered row, and the subpixels located in the 4i- Is applied,
During the 8n-4 frame period, a data voltage having a polarity opposite to the polarity of the voltage applied to the subpixel during the 8n-5 frame period is applied,
During a (8n-3) -th frame period, a data voltage having an opposite polarity to the voltage applied to the subpixel during the (8n-7)
During a (8n-2) -th frame period, a data voltage having an opposite polarity to the voltage applied to the sub-pixel during the (8n-6)
During a (8n-1) -th frame period, a data voltage having an opposite polarity to a voltage applied to the sub-pixel during the (8n-5)
And a data voltage having an opposite polarity to the voltage applied to the sub-pixel during the eighth (n-4) -th frame period is applied during the eighth frame period.

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