JP2008070754A - Liquid crystal display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display apparatus in which high display quality can be obtained by MF driving. <P>SOLUTION: In the first half (1st field) of the m-th frame, only the odd-numbered scanning lines (shown as first line, third line, and the like in the figure) are scanned. In the second half (second field) of the m-th frame, only the even-numbered scanning lines (shown as second line, fourth line, and the like in the figure) are scanned. Thus, a video signal is applied to all the pixel electrodes 3. Then, vertical pixel electrodes 3 adjoining one pixel electrode 3 are made to differ in the polarity from each other in the vertical direction which is in the direction of the scanning line Y, namely, vertical scanning direction, and pixel electrodes 3 adjoining in the horizontal direction are made to differ in the polarity. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device in which a pixel transistor is connected to a signal line and a scanning line at each intersection of a plurality of signal lines and a plurality of scanning lines, and a pixel electrode is connected to the pixel transistor.

  Among the signal line driving methods used in active matrix liquid crystal display devices, that is, the video signal writing method from each signal line to each pixel, it has been designed to prevent crosstalk and flicker while maintaining low power consumption. A 2H2V inversion method is known as a driving method (see Patent Document 1).

Further, there are cases where an interlace drive method is adopted in response to a request from low power consumption, and various proposals have been made for image enhancement methods in this interlace drive method. (For example, see Patent Document 2.)
JP 2003-215540 A JP 2004-20639 A

  Hereinafter, a problem to be solved by the present invention and a liquid crystal display device according to an embodiment of the present invention that solves the problem (hereinafter referred to as the present invention apparatus) will be described. explain.

  FIG. 1 is a diagram showing an arrangement of pixels in the device of the present invention. In the device of the present invention, in the array substrate constituting the liquid crystal panel 1, the plurality of signal lines X and the plurality of scanning lines Y are arranged to intersect with each other, and the pixel transistors 2 are connected to the signal lines X and the scanning lines Y at the intersections. The pixel electrode 3 is connected to the pixel transistor 2. In the device of the present invention, the scanning line driving IC 4 scans the scanning lines Y in the alignment direction, that is, the vertical scanning direction, and makes the pixel transistor 2 conductive. In the device of the present invention, the signal line driving IC 5 applies a video signal to the pixel electrode 3 via the conductive pixel transistor 2 and the signal line X. Although not shown, a counter substrate is disposed on the array substrate via a liquid crystal layer, and the counter substrate includes a counter electrode. In the device of the present invention, the potential of the counter electrode is made constant, for example, while the potential of the pixel electrode 3 is changed according to the video signal, thereby changing the light transmittance in the liquid crystal layer, whereby an image is displayed on the liquid crystal panel 1. Is displayed.

  At this time, the device according to the present invention performs inversion driving that repeatedly inverts the positive / negative polarity of the potential of the pixel electrode 3 with respect to the counter electrode. In the case of progressive driving for driving all scanning lines in one frame, in particular, 2H2V inversion driving ( Hereinafter, PG indicating progressive is taken and referred to as PG-2H2V inversion driving).

  FIG. 1 also shows an example of positive and negative polarity distributions in an arbitrary vertical scanning period (n-th frame) and n + 1-th frame in PG-2H2V inversion driving.

  In the nth frame, the video signals are applied to all the pixel electrodes 3 by scanning all the scanning lines Y. At that time, the positive and negative polarities of the upper and lower pixel electrodes 3 adjacent to the one pixel electrode 3 are made different, and the positive and negative polarities of the left and right pixel electrodes adjacent to the one pixel electrode are made different.

  In the (n + 1) th frame, the positive / negative polarity is reversed with respect to the nth frame.

  FIG. 2 is a diagram showing positive and negative polarities in the nth frame and the (n + 1) th frame when a black and intermediate checkered image is displayed by PG-2H2V inversion driving.

  Flicker is prevented because the sum of the positive polarity pixels constituting the intermediate color in the nth frame and the (n + 1) th frame is equal to the sum of the negative polarity pixels constituting the intermediate color in the nth frame and the (n + 1) th frame. Further, since the same applies when only one line extending in the left-right direction is viewed, horizontal crosstalk is prevented. Therefore, high display quality can be obtained with the PG-2H2V inversion driving.

FIG. 3 is a diagram showing an equivalent circuit of one arbitrary pixel. FIG. 4 is a timing chart for PG-2H2V inversion driving. The symbols in FIG.
Cp1: Coupling capacitance between pixel and own pixel signal line
Cp2: Coupling capacitance between pixel and adjacent pixel signal line
Cp3: Coupling capacity between upper and lower pixels
Clc: LCD capacity
Cs: Auxiliary capacity
Csig: Total capacity of signal line
Vcom: Counter electrode potential
Vcs: The potential of the auxiliary capacitance wiring.

The potential of the pixel is subject to fluctuations of Vs, Vn, and Vv by the potential fluctuation dVsig.s of the own pixel signal line, the potential fluctuation dVsig.n of the adjacent pixel signal line, and the potential fluctuation dVpix of the lower pixel, respectively. These fluctuations are
Vs = Cp1 / Cload × dVsig.s
Vn = Cp2 / Cload × dVsig.n
Vv = Cp3 / Cload × dVpix
It can be expressed as. However, Cload = Cp1 + Cp2 + 2Cp3 + Clc + Cs.

Here, the pixel electrode indicated by the arrow 1 in FIG. 1 (referred to as the pixel 1; hereinafter the same) and the pixel 2 are caused by the coupling capacitance between the signal line and the pixel electrode and between the pixel electrode and the pixel electrode. The respective potential fluctuation amounts (effective values) dVp1 and dVp2 are shown in FIG.
dVp1 = −1 / 2Vn−1 / 2Vs + Vv
dVp2 = 1 / 2Vn−1 / 2Vs−Vv
become that way. 1/2 indicates that there is a potential fluctuation only in half of the pixel potential holding period (same length as one frame).

The difference dVpa in the potential fluctuation amount between the pixel 1 and the pixel 2 is
dVpa = dVp2−dVp1 = Vn−2Vv = Cp2 / Cload × dVsig.n−2 × Cp3 / Cload × dVpix
It is represented by If the value of dVpa is large, the difference in potential between the upper and lower pixels increases, causing display unevenness. For this reason, it is desirable that dVpa = 0. In order to bring dVpa close to 0, attention is focused on increasing the coupling capacitance Cp3 substantially. That is, by providing capacitance between the upper and lower pixel electrodes, the coupling capacitance Cp3 is increased, and the capacitance value is adjusted so that dVpa becomes zero.

  As described above, in the PG-2H2V inversion driving, the coupling capacitance Cp3 is adjusted so that dVpa becomes 0, so that dVpa can be canceled and the occurrence of display unevenness can be prevented.

  By the way, in recent years, liquid crystal displays have been improved in resolution (increasing the number of pixels), and the driving frequency has been further increased. Under such circumstances, for example, Japanese Patent Application No. 2-69706 discloses a technique of multi-field driving (referring to multi-field MF, which is referred to as MF driving) for reducing the driving frequency to reduce power consumption. It is disclosed.

  Here, for comparison with the device of the present invention, a case where 2H2V inversion driving (referred to as MF-2H2V inversion driving) is performed by MF driving will be described.

  FIGS. 5 and 6 are diagrams illustrating an example of positive and negative polarity distributions in an arbitrary vertical scanning period (m-th frame) and m + 1-th frame in MF-2H2V inversion driving.

  In the first half (first field) of the m-th frame, only odd-numbered scanning lines (indicated by 1 row, 3 rows, etc. in the figure) are scanned. At that time, the positive and negative polarities of the upper pixel electrode 3 sandwiching one pixel electrode 3 with one pixel electrode 3 and the lower pixel electrode 3 sandwiching one pixel electrode 3 with the one pixel are different, and The left and right pixel electrodes 3 adjacent to one pixel electrode 3 are made to have different positive and negative polarities.

  In the second half (second field) of the mth frame, only even-numbered scanning lines (indicated by 2 rows, 4 rows, etc. in the figure) are scanned. At that time, the positive and negative polarities of the upper pixel electrode 3 sandwiching one pixel electrode 3 with one pixel electrode 3 and the lower pixel electrode 3 sandwiching one pixel electrode 3 with the one pixel are different, and The left and right pixel electrodes 3 adjacent to one pixel electrode 3 are made to have different positive and negative polarities.

  In the first half (first field) of the (m + 1) th frame, the positive / negative polarity is reversed with respect to the first half of the mth frame.

  In the second half (second field) of the (m + 1) th frame, the positive / negative polarity is reversed with respect to the second half of the mth frame.

The fluctuation of Vs, Vn, Vv by MF-2H2V inversion drive is the same as PG-2H2V inversion drive.
Vs = Cp1 / Cload × dVsig.s
Vn = Cp2 / Cload × dVsig.n
Vv = Cp3 / Cload × dVpix
It can be expressed as.

  Here, a difference in pixel potential between PG-2H2V inversion driving and MF-2H2V inversion driving will be described. Here, it specializes only in Vv.

  As shown in FIG. 7, in the PG-2H2V inversion driving, there is a variation due to the adjacent lower pixel. The pixel 1 fluctuates to the positive side because the adjacent lower pixel has a positive polarity. The pixel 2 changes to the positive side because the adjacent lower pixel has a positive polarity.

  On the other hand, as shown in FIG. 8, in the MF-2H2V inversion drive, there is a potential fluctuation due to adjacent upper and lower pixels. According to FIG. 8, there are three types of potential fluctuations.

For example, for the pixels 3 and 4 in FIG. 8, the respective potential fluctuation amounts (effective values) dVp3 and dVp4 due to the coupling capacitance between the signal line and the pixel electrode and between the pixel electrode and the pixel electrode are
Since Vs and Vn components caused by Cp1 and Cp2 are not different from those of 2H2V inversion drive,
dVp3 = −1 / 2Vn−1 / 2Vs + Vv−Vv = −1 / 2Vn−1 / 2Vs
dVp4 = 1 / 2Vn−1 / 2Vs + 1/2 × 2Vv = 1 / 2Vn−1 / 2Vs + Vv
become that way. Vv−Vv indicates that cancellation is performed by the upper and lower pixels. 1/2 of 1/2 × 2Vv indicates that there is a potential fluctuation only in half of the pixel potential holding period (the same length as one frame).

The difference dVpb between the potential fluctuation amounts of the pixel 3 and the pixel 4 is
dVpb = dVp4−dVp3 = Vn + Vv = Cp2 / Cload × dVsig.n + Cp3 / Cload × dVpix
Thus, the value is different from dVpa of PG-2H2V inversion driving.

  For this reason, in the PG-2H2V inversion drive, if the coupling capacitance Cp3 is set so that dVpa is 0, dVpb≈0 and display unevenness occurs.

  In addition, the potential fluctuation caused by Cp3 in the MF-2H2V inversion drive has a lower frequency than the potential fluctuation caused by Cp1 and Cp2, so that the liquid crystal responds to the potential fluctuation of the pixel 3, the pixel 5, and the like. As a result, a problem of flickering occurs.

  That is, it is difficult to prevent display unevenness and flicker by both PG-2H2V inversion driving and MF-2H2V inversion driving.

  Further, even in the case of performing so-called V inversion driving in progressive driving and MF-2H2V inversion driving in MF driving, high display quality cannot be obtained in the MF-2H2V inversion driving.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device capable of obtaining high display quality by MF driving.

  It is a further object to obtain a high display quality even in progressive driving.

  In order to achieve the above object, in a liquid crystal display device according to the present invention, a pixel transistor is connected to a signal line and a scanning line at each intersection of a plurality of signal lines and a plurality of scanning lines, and the pixel electrode is connected to the pixel transistor. In the liquid crystal display device to which is connected, the odd-numbered scanning lines are connected to the pixel transistors which are turned on by scanning the odd-numbered scanning lines in the first half or the second half of the frame and the even-numbered scanning lines in the remaining period, respectively. The video signal is applied to the pixel electrode through the signal line, and the positive / negative polarity of the video signal applied to the upper and lower pixel electrodes adjacent to the one pixel electrode in the vertical direction that is the arrangement direction of the scanning lines is made different. It is characterized by that.

  According to the liquid crystal display device of the present invention, for example, when a video signal is applied to one pixel electrode in the first half of the frame, the video signal is applied to the upper and lower pixel electrodes in the second half of the frame. In this case, by changing the positive / negative polarity, for example, the change due to the upper pixel electrode in the first half of the pixel electrode is canceled by the change due to the lower pixel electrode, so that high display quality can be obtained.

  In the left-right direction, for example, the positive and negative polarities of video signals applied to adjacent pixel electrodes are made different or the same.

  In progressive driving in which a video signal is applied to a pixel electrode by scanning a plurality of scanning lines over the entire period of the frame, the positive / negative polarity of the video signal applied to the upper and lower pixel electrodes adjacent to one pixel electrode is different. In addition, by changing the positive and negative polarity of the video signal applied to the left and right pixel electrodes adjacent to one pixel electrode, high display quality can be obtained.

  In progressive driving, the positive and negative polarities of the video signals applied to the pixel electrodes adjacent to each other in the vertical direction are the same, and the positive and negative polarities of the video signals applied to the pixel electrodes adjacent to each other in the horizontal direction are different. Thus, high display quality can be obtained.

  According to the liquid crystal display device of the present invention, by changing the positive / negative polarity of the video signal applied to the upper and lower pixel electrodes adjacent to one pixel electrode in the vertical direction that is the alignment direction of the scanning lines, Since the variation due to one of the electrodes cancels the variation due to the other, high display quality can be obtained.

  Hereinafter, the MF driving of the apparatus of the present invention will be described with reference to the drawings. In the device of the present invention, since the value of Cp3 is adjusted so that dVpa = 0, display unevenness and flicker can be prevented by PG-2H2V inversion driving. In the following, MF driving that can provide high display quality even with such Cp3 will be mainly described.

[First Embodiment]
First, MF driving according to the first embodiment will be described.

  FIGS. 9 and 10 are diagrams showing an example of positive and negative polarity distributions in an arbitrary vertical scanning period (m-th frame) and m + 1-th frame at the time of MF driving.

  In the first half (first field) of the m-th frame, only odd-numbered scanning lines are scanned. In the second half (second field) of the mth frame, only the even-numbered scanning lines are scanned. Thereby, a video signal is applied to all the pixel electrodes 3. At that time, that is, at the end of the m-th frame, the positive and negative polarities of the upper and lower pixel electrodes 3 adjacent to one pixel electrode 3 are made different in the arrangement direction of the scanning lines Y, that is, the vertical direction which is the vertical scanning direction. The positive and negative polarities of the pixel electrodes 3 adjacent to each other in the direction are made different.

  In the first half (first field) of the (m + 1) th frame, the positive / negative polarity is reversed with respect to the first half of the mth frame.

  In the second half (second field) of the (m + 1) th frame, the positive / negative polarity is reversed with respect to the second half of the mth frame.

  Such MF driving is called MF-H / V inversion driving because the positive and negative polarities are inverted for each pixel electrode in the vertical scanning direction and the horizontal direction when viewed in the same field.

  FIG. 11 is a timing chart for MF-H / V inversion driving.

The pixel potential is subject to fluctuations in Vs, Vn, and Vv by the potential fluctuation dVsig.s of the own pixel signal line, the potential fluctuation dVsig.n of the adjacent pixel signal line, and the potential fluctuation dVpix of the lower pixel, respectively. Is
Vs = Cp1 / Cload × dVsig.s
Vn = Cp2 / Cload × dVsig.n
Vv = Cp3 / Cload × dVpix
It can be expressed as.

  As shown in FIG. 11, for pixel 1 and pixel 3 in FIG. 9, the effective values of pixel potential fluctuations due to the coupling capacitances of Cp1 and Cp2 are both 1 / 2Vn−1 / 2Vs. This is the same for all pixels.

  In addition, as shown in FIG. 12, both pixel potential fluctuations due to the coupling capacitance of Cp3 are zero. This is the same for all pixels.

For example, for pixel 1 and pixel 3, potential fluctuation amounts (effective values) dVp1, dVp3 are
dVp1 = 1 / 2Vn−1 / 2Vs + Vv−Vv = 1 / 2Vn−1 / 2Vs
dVp3 = 1 / 2Vn−1 / 2Vs + Vv−Vv = 1 / 2Vn−1 / 2Vs
It becomes. Vv−Vv varies with the adjacent pixel after a period of half the length of one frame has elapsed since the video signal was applied to the pixel electrode (the timing indicated by an arrow “0” in FIG. 12). Indicates that it is canceled due to a variation caused by a pixel adjacent below.

  Thus, dVp1 = dVp3 regardless of the values of Cp1, Cp2, and Cp3. The same applies to the pixel 2 as shown in FIG. In this way, since the amount of potential fluctuation of each pixel is equal, display unevenness and flicker can be prevented.

  Therefore, in the first embodiment, high display quality can be obtained by both PG driving (PG-2H2V inversion driving) and MF driving (MF-H / V inversion driving).

[Second Embodiment]
Next, MF driving according to the second embodiment will be described.

  FIGS. 13 and 14 are diagrams showing an example of positive and negative polarity distributions in an arbitrary vertical scanning period (m-th frame) and m + 1-th frame at the time of MF driving.

  In the first half (first field) of the m-th frame, only odd-numbered scanning lines are scanned. In the second half (second field) of the mth frame, only the even-numbered scanning lines are scanned. Thereby, a video signal is applied to all the pixel electrodes 3. At that time, the positive and negative polarities of the upper and lower pixel electrodes adjacent to the one pixel electrode 3 are made different in the alignment direction of the scanning lines, that is, the vertical direction which is the vertical scanning direction, and the positive and negative polarities of the pixel electrodes adjacent to each other in the horizontal direction are changed. Make the same.

  In the first half (first field) of the (m + 1) th frame, the positive / negative polarity is reversed with respect to the first half of the mth frame. In the second half (second field) of the (m + 1) th frame, the positive / negative polarity is reversed with respect to the second half of the mth frame.

  Such MF driving is called MF-H inversion driving because the positive / negative polarity is inverted for each pixel electrode (row) arranged in the horizontal direction in the same field.

For example, for pixel 1 and pixel 2 in FIG. 13, the respective potential fluctuation amounts (effective values) dVp1 and dVp2 due to the coupling capacitance between the signal line and the pixel electrode and between the pixel electrode and the pixel electrode are
dVp1 = −1 / 2Vn−1 / 2Vs + Vv−Vv = −1 / 2Vn−1 / 2Vs
dVp2 = −1 / 2Vn−1 / 2Vs + Vv−Vv = −1 / 2Vn−1 / 2Vs
It becomes. Vv-Vv means that, after the video signal is applied to the pixel electrode, after a period of half the length of one frame has elapsed, the fluctuation due to the upper adjacent pixel is canceled by the fluctuation due to the lower adjacent pixel. Indicates.

  Thus, dVp1 = dVp2 regardless of the values of Cp1, Cp2, and Cp3. Since the potential fluctuation amount is also applied to other pixels, display unevenness and flicker can be prevented.

  Therefore, in the second embodiment, high display quality can be obtained by both PG driving (PG-2H2V inversion driving) and MF driving (MF-H inversion driving).

[Third Embodiment]
Next, a third embodiment will be described. In the third embodiment, MF-H / V inversion driving or MF-H inversion driving is similarly performed. In PG driving, V inversion driving (referred to as PG-V inversion driving) is performed instead of PG-2H2V inversion driving. I do.

  FIG. 15 is a diagram illustrating an example of positive and negative polarity distributions in an arbitrary vertical scanning period (n-th frame) and n + 1-th frame in the PG-V inversion driving.

  In the nth frame, the video signals are applied to all the pixel electrodes 3 by scanning all the scanning lines Y. At this time, the positive and negative polarities of the pixel electrodes adjacent to each other in the scanning line arrangement direction, that is, the vertical direction which is the vertical scanning direction are made the same, and the positive and negative polarities of the pixel electrodes adjacent to each other in the horizontal direction are made different.

  In the (n + 1) th frame, the positive / negative polarity is reversed with respect to the nth frame.

  In PG-V inversion driving, it is not necessary to intentionally add Cp3 as in PG-2H2V inversion driving. However, since there is always a coupling capacitance between upper and lower pixels as a parasitic capacitance, this is set to Cp3. .

In the PG-V inversion driving, the respective potential fluctuation amounts dVp1 and dVp2 due to the coupling capacitance between the signal line and the pixel electrode of the pixel 1 and the pixel 2 and between the pixel electrode and the pixel electrode are
dVp1 = + Vv
dVp2 = + Vv
It is.

  With respect to the pixels at the top of the screen, since dVsig.s = 0 and dVsig.n = 0, Vs = 0 and Vn = 0.

  On the other hand, for the pixels at the bottom of the screen, dVp1 = dVp2 = Vn−Vs + Vv.

  For the n-th row pixel, dVp1 = dVp2 = n / total number of scanning lines × (Vn−Vs) + Vv.

  Therefore, in PG-V inversion driving, dVp1 = dVp2, and display unevenness and flicker can be prevented regardless of the values of Cp1, Cp2, and Cp3.

  Here, for comparison with the device of the present invention, a case where V inversion driving (referred to as MF-V inversion driving) is performed by MF driving will be described.

  FIGS. 16 and 17 are diagrams showing examples of positive and negative polarity distributions in an arbitrary vertical scanning period (m-th frame) and m + 1-th frame at that time.

  In the first half (first field) of the m-th frame, only odd-numbered scanning lines are scanned. In the second half (second field) of the mth frame, only the even-numbered scanning lines are scanned. Thereby, a video signal is applied to all the pixel electrodes 3. At that time, the positive and negative polarities of the pixel electrodes adjacent to each other in the vertical direction are made the same, and the positive and negative polarities of the pixel electrodes adjacent to each other in the horizontal direction are made different.

  In the first half (first field) of the (m + 1) th frame, the positive / negative polarity is reversed with respect to the first half of the mth frame. In the second half (second field) of the (m + 1) th frame, the positive / negative polarity is reversed with respect to the second half of the mth frame.

In the MF-V inversion drive, the respective potential fluctuation amounts dVp3 and dVp4 due to the coupling capacitance between the signal lines and the pixel electrodes of the pixels 3 and 4 and between the pixel electrodes and the pixel electrodes
dVp3 = + Vv
dVp4 = 1/2 (Vn−Vs) −Vv
dVp = dVp4−dVp3 = 1/2 (Vn−Vs) −2Vv
It becomes. Therefore, it is difficult to bring dVp close to 0 unless Cp1 and Cp2 are adjusted so that Cp3 is considerably reduced and Vn = Vs. In order to reduce Cp3, the pixel electrodes must be separated from each other, which causes a decrease in the pixel aperture ratio. Further, since Vv ≠ 0, flicker is also generated.

  In this respect, as described above, the device of the present invention can prevent display unevenness and flicker regardless of the values of Cp1, Cp2, and Cp3, and can provide high display quality.

  In the device according to the present invention, the odd-numbered scanning lines are scanned in the first half of the frame and the even-numbered scanning lines are scanned in the second half. However, the odd-numbered scanning lines are scanned evenly in the second half of the frame. The numbered scanning lines may be scanned in the first half period.

It is a figure which shows arrangement | positioning of the pixel in the liquid crystal display device which concerns on embodiment of this invention. It is a figure which shows the positive / negative polarity in the nth frame and the n + 1th frame when displaying a black and intermediate color checkered image. It is a figure which shows the equivalent circuit of arbitrary one pixel. It is a timing chart at the time of PG-2H2V inversion drive. It is a figure shown about an example of positive / negative polarity distribution in the m-th flame | frame at the time of MF-2H2V inversion drive. It is a figure shown about an example of positive / negative polarity distribution in the (m + 1) th frame at the time of MF-2H2V inversion drive. It is a figure which shows the electric potential fluctuation | variation of the pixel at the time of PG-2H2V inversion drive. It is a figure which shows the electric potential fluctuation | variation of the pixel at the time of MF-2H2V inversion drive. It is a figure shown about an example of positive / negative polarity distribution in the m-th flame | frame at the time of MF-H / V inversion drive. It is a figure shown about an example of positive / negative polarity distribution in the (m + 1) th frame at the time of MF-H / V inversion drive. 6 is a timing chart at the time of MF-H / V inversion driving. It is a figure which shows the electric potential fluctuation | variation of the pixel at the time of MF-H / V inversion drive. It is a figure shown about an example of positive / negative polarity distribution in the m-th flame | frame at the time of MF-H inversion drive. It is a figure shown about an example of positive / negative polarity distribution in the (m + 1) th frame at the time of MF-H inversion drive. It is a figure shown about an example of positive / negative polarity distribution in the nth and n + 1th frame at the time of PG-V inversion drive. It is a figure shown about an example of positive / negative polarity distribution in the m-th flame | frame at the time of MF-V inversion drive. It is a figure shown about an example of positive / negative polarity distribution in the (m + 1) th frame at the time of MF-V inversion drive.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 Pixel transistor 3 Pixel electrode 4 Scan line drive IC
5 Signal line drive IC

Claims (5)

In a liquid crystal display device in which a pixel transistor is connected to a signal line and a scanning line at each intersection of a plurality of signal lines and a plurality of scanning lines, and a pixel electrode is connected to the pixel transistor,
An odd numbered scanning line is scanned in the first half or the second half of the frame, and an even numbered scanning line is scanned in the remaining period, and a video signal is transmitted via a signal transistor connected to the pixel transistor. Is applied to the pixel electrode, and the positive / negative polarity of the video signal applied to the upper and lower pixel electrodes adjacent to the one pixel electrode in the vertical direction that is the arrangement direction of the scanning lines is different. In a liquid crystal display device having an array substrate including a pixel transistor connected to a signal line and a scanning line at each intersection of a plurality of signal lines and a plurality of scanning lines, and a pixel electrode connected to the pixel transistor ,
An odd numbered scanning line is scanned in the first half or the second half of the frame, and an even numbered scanning line is scanned in the remaining period, and a video signal is transmitted through a pixel transistor that is turned on and a signal line connected to the pixel transistor. Are applied to the pixel electrodes, and the positive and negative polarities of the video signals applied to the upper and lower pixel electrodes adjacent to the one pixel electrode are different in the vertical direction, which is the arrangement direction of the scanning lines, and are adjacent to each other in the horizontal direction. A liquid crystal display device characterized in that positive and negative polarities of video signals applied to pixel electrodes are made different. In a liquid crystal display device having an array substrate including a pixel transistor connected to a signal line and a scanning line at each intersection of a plurality of signal lines and a plurality of scanning lines, and a pixel electrode connected to the pixel transistor ,
An odd numbered scanning line is scanned in the first half or the second half of the frame, and an even numbered scanning line is scanned in the remaining period, and a video signal is transmitted via a signal transistor connected to the pixel transistor. Are applied to the pixel electrodes, and the positive and negative polarities of the video signals applied to the upper and lower pixel electrodes adjacent to the one pixel electrode are different in the vertical direction, which is the arrangement direction of the scanning lines, and are adjacent to each other in the horizontal direction. A liquid crystal display device characterized in that video signals applied to pixel electrodes have the same positive / negative polarity.   The video signal is applied to the pixel electrode by scanning the plurality of scanning lines over the entire period of the frame, and the positive / negative polarity of the video signal applied to the upper and lower pixel electrodes adjacent to the one pixel electrode is changed, and 4. The liquid crystal display device according to claim 1, wherein the positive and negative polarities of video signals applied to the left and right pixel electrodes adjacent to one pixel electrode can be made different.   The video signal is applied to the pixel electrode by scanning the plurality of scanning lines over the entire period of the frame, and the positive and negative polarities of the video signals applied to the pixel electrodes adjacent to each other in the vertical direction are the same, and the horizontal direction 4. The liquid crystal display device according to claim 1, wherein the positive and negative polarities of video signals applied to adjacent pixel electrodes can be made different.

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