JPH11202288A - Liquid crystal display device and driving method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce flicker to realize a high quality picture and to enable a display device to be driven with a low power consumption by changing the polarity of a video signal for every group composed of respective plural pixels in the column direction. SOLUTION: One group is composed of four pixels, for example, in the column direction. Concerning 12 pieces of pixels provided on the most left side, the polarities of video signals to be impressed to first - fourth and ninth - twelfth pixels from above in the column direction are positive and the polarities of video signals to be impressed to fifth - eight pixels are negative. The polarity change of the video signal is controlled by adding a control circuit to a signal driving correct 1 or line driving correct 2. In order to change the polarity of pixels consisting of one group for every group, for example, a polarity signal generating circuit 8 is provided additionally to the signal driving circuit. The polarity control signal generating circuit 8 is constituted by synthesizing logic circuits such as gate arrays, for example, and the output timing of the video signal is controlled so as to compose one group of plural pixels.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a matrix type liquid crystal display device comprising a plurality of pixels arranged in a matrix and a method of driving the same.

[0002]

2. Description of the Related Art Generally, a matrix type liquid crystal display device comprises a plurality of pixels. The plurality of pixels are arranged in a matrix with a plurality of first wirings arranged in parallel with each other and a plurality of second wirings orthogonal to the first wirings as boundaries. A thin film transistor (hereinafter, referred to as “TFT”) as an active element is provided at each intersection of the first wiring and the second wiring. Further, the pixels include liquid crystal.

Next, an example of a conventional driving method of a liquid crystal display device will be described.

FIG. 20 is an explanatory diagram showing an example of a conventional liquid crystal display device. FIG. 20A shows the polarity of a video signal applied to each pixel of the liquid crystal display device in a certain frame (for example, m frames, where m is 0 or a natural number). FIG. 20B shows the polarity of the video signal applied to each pixel of the liquid crystal display device in the (m + 1) th frame. In FIG. 20, reference numeral 1 denotes a signal driving circuit for generating a video signal applied to each pixel, 2 denotes a line driving circuit for generating a line signal for selecting a row, and 3 denotes a first wiring. (Hereinafter referred to as “video signal line”) connected to the signal drive circuit 1 that generates
Line driving circuit 2 for generating line signals
(Hereinafter referred to as “line signal line”),
Reference numeral 5 denotes a pixel. The + or-sign shown in each pixel schematically indicates the polarity of the video signal applied to the pixel, that is, positive or negative.

FIG. 20 shows that the video signal lines 3
The image signal line 3, the line signal line 4, and the pixel 5
Is not limited to this. Although not shown in FIG. 20, a TFT is provided at each intersection of the video signal line 3 and the line signal line 4, and the TFT is connected to the video signal line 3 and the line signal line 4. When a line signal having a voltage value for turning on the TFT is applied to only a specific line signal line among the plurality of line signal lines 4 (that is, a specific line signal line is selected), the specific line signal line is selected. The TFT connected to the line is turned on, and the remaining TFT
Is turned off. The video signal generated by the signal drive circuit is applied only to the pixel including the TFT that is turned on.

The liquid crystal display device (1) provides a plurality of video signals output from the signal drive circuit 1 to each video signal line 3,
(2) A specific line signal line 4 is selected according to the line signal output from the line drive circuit 2, (3) Only the TFTs connected to the selected line signal line 4 are turned on, and (4) Apply a predetermined video signal generated by the signal drive circuit only to the pixels including the TFT in the state,
(5) A predetermined image is displayed by controlling the light transmittance of the liquid crystal of each pixel based on the potential difference between the applied predetermined image signal and the opposite common signal. The video signal and the common signal are respectively applied to two electrodes (not shown) for applying an electric field to the liquid crystal.

In general, when a voltage of the same polarity is applied to a liquid crystal for a long time, the liquid crystal deteriorates, and even if the application of the voltage to the liquid crystal is stopped, the light transmittance of the liquid crystal remains unchanged before the voltage is applied to the liquid crystal. The transmittance may not return. Therefore, it is necessary to change the polarity of the applied video signal from time to time to convert the video signal into an alternating current. Therefore, in the conventional liquid crystal display device shown in FIG. 20, the polarity of the video signal applied to each pixel is changed for each frame to drive the liquid crystal display device. Note that a method of driving the liquid crystal display device by changing the polarity of the video signal for each frame is called a frame inversion driving method. However, when the frame inversion driving method is used, the period in which the polarity of the video signal changes becomes a low frequency, and when the display is actually performed, flicker on the screen (video flicker) occurs.
There is a problem that is noticeable. In addition, since the polarity of the video signal and the line signal is the same in one frame, crosstalk caused by the influence of the video signal and the line signal applied to other pixels increases, and the image quality deteriorates. There is.

Next, a driving method of a conventional liquid crystal display device provided to solve the above-mentioned problem will be described.

FIG. 21 is an explanatory view showing another example of a conventional liquid crystal display device. 21, the same parts as those in FIG. 20 are indicated by the same reference numerals. In the liquid crystal display device shown in FIG. 21, the polarity of the video signal is changed for each pixel to drive the liquid crystal display device. A method of driving the liquid crystal display device by changing the polarity of the video signal for each pixel is called a dot inversion driving method. When the dot inversion driving method is used, flicker and crosstalk generated when the frame inversion driving method is used are reduced. However, the frequency at which the polarity of the video signal changes becomes very high, and the power consumption when driving the liquid crystal display device increases. In addition, the number of pixels increases with the recent increase in resolution, the time for applying a video signal to each pixel is shortened, charging failure occurs, and image quality deteriorates.

[0010]

When the above-described frame inversion driving method is used, there is a problem that flicker and crosstalk are conspicuous and image quality is reduced. On the other hand, when the dot inversion driving method is used, there is a problem that power consumption for driving the liquid crystal display device increases, and in a high resolution liquid crystal display device, charging failure occurs and image quality deteriorates. Therefore,
It is difficult to achieve both high image quality and low power consumption.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a driving method of a liquid crystal display device which realizes high image quality by reducing flicker and consumes low power.

[0012]

According to a first aspect of the present invention, there is provided a driving method of a liquid crystal display device, wherein a predetermined video signal is applied to a pixel constituting a selected row among a plurality of pixels arranged in a matrix. A method of driving a liquid crystal display device that displays a predetermined image by dividing a plurality of pixels into a plurality of groups each including at least two pixels in a column direction, and changing a polarity of a video signal for each group. Things.

In this specification, the column direction refers to a direction parallel to a video signal line.

According to a second aspect of the present invention, there is provided a method of driving a liquid crystal display device, wherein pixels constituting each group are changed for each frame.

According to a third aspect of the present invention, there is provided a driving method of a liquid crystal display device, wherein one group includes n pixels.
The boundary between groups is shifted by n-1 pixels for each frame.

According to a fourth aspect of the present invention, in the driving method of the liquid crystal display device, the number of pixels constituting one group in one frame is changed for each group.

Further, in the driving method of a liquid crystal display device according to a fifth aspect of the present invention, the number of pixels constituting the one group is regularly changed.

Further, in the driving method of a liquid crystal display device according to a sixth aspect of the present invention, the number of pixels constituting the one group is changed irregularly.

Further, in the driving method of a liquid crystal display device according to a seventh aspect of the present invention, the number of pixels constituting the one group is limited.

Further, in the driving method of a liquid crystal display device according to the present invention, the number of rows to be simultaneously selected is at least two.
One.

Further, in the driving method of the liquid crystal display device according to the ninth aspect of the present invention, the same row is selected before and after a polarity inversion edge serving as a control reference of a vertical clock signal for controlling a timing of changing the video signal. In such a case, when the polarity of the vertical clock signal changes, a line signal for controlling a selected row is set to a low level in the row.

Further, in the driving method of the liquid crystal display device according to the tenth aspect of the present invention, the polarities of the pixels constituting the simultaneously selected rows are the same in the column direction.

In the driving method of a liquid crystal display device according to the present invention, the number of rows selected simultaneously is at least one, and the polarities of pixels constituting the simultaneously selected rows are the same in the column direction. is there.

According to a twelfth aspect of the present invention, in the method for driving a liquid crystal display device, a predetermined video signal is applied to a pixel constituting a selected row from among a plurality of pixels arranged in a matrix, so that a predetermined video signal is applied. A method of driving a liquid crystal display device for displaying, wherein a plurality of pixels are divided into a plurality of groups each including at least two pixels in a row direction, and the polarity of a video signal is changed for each group.

In this specification, the row direction refers to a direction parallel to a line signal line.

According to a thirteenth aspect of the present invention, in the driving method of the liquid crystal display device, a predetermined video signal is applied to a pixel constituting a selected row among a plurality of pixels arranged in a matrix, so that a predetermined video signal is applied. A method for driving a liquid crystal display device for displaying, wherein a plurality of pixels are divided into a plurality of groups each including at least two pixels in a column direction and a row direction, and the polarity of a video signal is changed for each group. .

According to a fourteenth aspect of the present invention, in the method of driving a liquid crystal display device, a predetermined image is applied by applying a predetermined image signal to pixels constituting a selected row among a plurality of pixels arranged in a matrix. This is a method of driving a liquid crystal display device for displaying a plurality of pixels in a column direction collectively as a plurality of frames, and changing the polarity of a video signal for each set.

In the driving method of a liquid crystal display device according to the present invention, the number of rows selected simultaneously is at least two.

In the method of driving a liquid crystal display device according to the present invention, the same row is selected before and after a polarity inversion edge serving as a control reference of a vertical clock signal for controlling a timing of changing the video signal. In this case, when the polarity of the vertical clock signal changes, a line signal for controlling a selected row is set to a low level in the row.

In the driving method of a liquid crystal display device according to a seventeenth aspect of the present invention, the polarities of the pixels constituting the simultaneously selected rows are the same in the column direction.

In the driving method of a liquid crystal display device according to the present invention, the number of rows selected at a time is at least one, and the polarities of pixels constituting the simultaneously selected rows are the same in the column direction. .

According to a nineteenth aspect of the present invention, in the driving method of the liquid crystal display device, the number of frames constituting the set is regularly changed.

According to a twentieth aspect of the present invention, in the method of driving a liquid crystal display device, the number of frames constituting the set is irregularly changed.

According to a driving method of a liquid crystal display device according to the present invention, a predetermined video signal is applied to a pixel constituting a selected row among a plurality of pixels arranged in a matrix, so that a predetermined video signal is applied. This is a method of driving a liquid crystal display device for displaying, in which a plurality of frames are collectively set in a row direction, and the polarity of a video signal is changed for each set.

In the method of driving a liquid crystal display device according to the present invention, the number of rows selected at a time is at least two.

In the driving method of a liquid crystal display device according to claim 23 of the present invention, the same row is selected before and after a polarity inversion edge serving as a control reference of a vertical clock signal for controlling a timing of changing the video signal. In this case, when the polarity of the vertical clock signal changes, a line signal for controlling a selected row is set to a low level in the row.

In the driving method of a liquid crystal display device according to claim 24 of the present invention, the polarities of the pixels constituting the simultaneously selected rows are the same in the column direction.

In the driving method of a liquid crystal display device according to the twenty-fifth aspect of the present invention, the number of simultaneously selected rows is at least one, and the polarities of pixels constituting the simultaneously selected rows are the same in the column direction. .

According to a driving method of a liquid crystal display device according to claim 26 of the present invention, the number of frames constituting the set is changed regularly.

According to a twenty-seventh aspect of the present invention, in the driving method of the liquid crystal display device, the number of frames constituting the set is changed irregularly.

According to a twenty-eighth aspect of the present invention, a liquid crystal display device includes a signal driving circuit for driving a video signal, a line driving circuit for driving a line signal, and a polarity control signal generating circuit for generating a control signal for changing the polarity of the video signal. The circuit includes at least a circuit, and the polarity of the pixels forming one group is changed for each group by the control signal.

A liquid crystal display device according to a twenty-ninth aspect of the present invention provides a signal driving circuit for driving a video signal, a line driving circuit for driving a line signal, and a polarity control signal generating circuit for generating a control signal for changing the polarity of the video signal. At least a circuit is included, and the number of pixels constituting one group is randomly changed for each group by the control signal.

A liquid crystal display device according to claim 30 of the present invention includes at least a signal drive circuit for driving a video signal, a line drive circuit for driving a line signal, a random pattern generation circuit and a modulation circuit, and the random pattern generation circuit Is modulated through the modulation circuit, thereby limiting the number of pixels constituting one group and changing the number randomly for each group.

[0044]

Next, an embodiment of a method for driving a liquid crystal display device according to the present invention will be described.

Embodiment 1 Embodiment 1 of a method for driving a liquid crystal display device of the present invention will be described with reference to the drawings. In the present embodiment, the plurality of pixels are divided into a plurality of groups each including at least two pixels, and the polarity of the video signal is changed for each group. In the present specification, the polarity of the video signal refers to the polarity of the voltage value of the video signal with respect to the voltage value of the opposite common signal.

FIG. 1 is an explanatory view showing an example of a liquid crystal display device. FIG. 1 is shown for explaining Embodiment 1 of a method for driving a liquid crystal display device of the present invention. In FIG. 1A, reference numeral 8 denotes a polarity control signal generation circuit for generating a control signal for changing the polarity of a video signal. In FIG. 1B, reference numeral 10 denotes a control circuit, and 8a and 8a. 8b indicates a position where the polarity control signal generation circuit can be provided. The same parts as those in FIG. 20 are denoted by the same reference numerals, and are the same as those in the conventional liquid crystal display device. In the liquid crystal display device of FIG. 1, one group is formed by four pixels in the column direction.

For example, 1 is provided on the leftmost side of the drawing.
Two pixels are 1 to 4 and 9 to 12 from the top in the column direction.
The polarity of the video signal applied to the pixel is positive and 5
The polarity of the video signal applied to the eighth to eighth pixels is negative. In the 14 pixels provided on the uppermost side of the paper, the polarity of the video signal changes every pixel in the row direction, and the polarity of the video signal applied to the leftmost pixel is positive.

According to the driving method of the liquid crystal display device of the first embodiment, the period in which the polarity of the video signal changes is higher than that of the frame inversion driving method, and high-quality display with less flicker and crosstalk is realized. it can. Further, the cycle in which the polarity of the video signal changes becomes lower in frequency than in the dot inversion driving method, and the power consumption when driving the liquid crystal display device can be reduced.

The control of the polarity change of the video signal can be realized by adding a control circuit to the signal drive circuit 1 and the line drive circuit 2. For example, the polarity control signal generation circuit 8 is additionally provided to the signal drive circuit in order to change the polarity of the pixels constituting one group for each group. As shown in FIG. 1B, the polarity control signal generation circuit 8 may be provided at a position 8a in the control circuit 10 for controlling the signal drive circuit 1 and the line drive circuit 2, ) May be provided independently, or may be provided at a position 8 b in the signal drive circuit 1 and the line drive circuit 2. In the following description, an example in which the polarity control signal generation circuit is provided independently as shown in FIG. Since the polarity control signal generation circuit 8 is formed by combining logic circuits such as a gate array, for example, the polarity control signal generation circuit 8 controls the output timing of the video signal so that a plurality of pixels form one group. As a result, the polarity change and output timing of the video signal for each pixel can be controlled for each of a plurality of arbitrary pixels. The signal drive circuit 1 and the line drive circuit 2 are provided with a timing controller for adjusting the polarity of a video signal or a line signal. It can also be realized by adding a function of performing control.

In the present embodiment, the number of pixels constituting one group is four, but the number is not limited to this, and one group may be composed of two or more pixels.

Second Embodiment Next, a second embodiment of the method of driving a liquid crystal display device according to the present invention will be described with reference to the drawings. In this embodiment mode, in addition to the method for driving the liquid crystal display device described in Embodiment Mode 1, the pixels forming one group are changed for each frame. Also in this case, as in the first embodiment, a logic circuit is combined with the polarity control signal circuit 8, and the polarity change and output timing of the video signal for each pixel are arbitrarily controlled to control the polarity change of the video signal. .

FIG. 2 is an explanatory view showing another example of the liquid crystal display device. FIG. 2 is shown for explaining Embodiment 2 of the driving method of the liquid crystal display device of the present invention. FIG. 2 (a)
It shows the polarity of the video signal applied to each pixel of the liquid crystal display device in m frames. FIG. 2B shows the polarity of the video signal applied to each pixel of the liquid crystal display device in the (m + 1) th frame. Note that the liquid crystal display device shown in FIG. 2 is the same as the liquid crystal display device of the first embodiment, and the same portions as those in FIG. 1 are denoted by the same reference numerals.

As shown in FIG. 2A, in the m-th frame, four pixels form one group in the column direction. In other words, the 12
In the pixels, the polarity of the video signal applied to the first to fourth and ninth to twelfth pixels from the top in the column direction is positive;
The polarity of the video signal applied to the eighth pixel is negative.
Further, as shown in FIG. 2B, in the (m + 1) th frame, the twelve pixels provided on the leftmost side of the paper are the video signals applied to the first, second and seventh to tenth pixels from the top in the column direction. Is negative, and the polarity of the video signal applied to the third to sixth, eleventh, and twelfth pixels is positive.

According to the driving method of the liquid crystal display device of the second embodiment, the period in which the polarity of the video signal changes becomes higher than that of the frame inversion driving method, and high quality display with less flicker and crosstalk is realized. As well as prevent the deterioration of the liquid crystal. Further, the cycle in which the polarity of the video signal changes becomes lower in frequency than in the dot inversion driving method, and the power consumption when driving the liquid crystal display device can be reduced.

Third Embodiment Next, a third embodiment of the method of driving a liquid crystal display device according to the present invention will be described with reference to the drawings. In this embodiment mode, in addition to the method for driving the liquid crystal display device described in Embodiment Mode 1, one group includes n pixels, and a boundary between groups is shifted by n-1 pixels for each frame. (Where n is 0 or a natural number).

FIG. 3 is an explanatory view showing another example of the liquid crystal display device. FIG. 3 is shown for explaining Embodiment 3 of the driving method of the liquid crystal display device of the present invention. FIG. 3 (a)
It shows the polarity of the video signal applied to each pixel of the liquid crystal display device in m frames. FIG. 3B shows the polarity of the video signal applied to each pixel of the liquid crystal display device in the (m + 1) th frame. Note that the liquid crystal display device shown in FIG. 3 is the same as the liquid crystal display device of the first embodiment, and the same portions as those in FIG. 1 are denoted by the same reference numerals.

As shown in FIG. 3A, in the m frame, four pixels form one group in the column direction. Further, as shown in FIG.
In one frame, the boundary between the groups is shifted downward by three pixels. That is, the 12 pixels provided on the leftmost side of the paper are 1 to 3 and 8 to 8 from the top in the column direction.
The polarity of the video signal applied to the eleventh pixel is negative, and the polarity of the video signal applied to the fourth to seventh and twelfth pixels is positive. The polarity of the video signal applied to the thirteenth to fifteenth pixels (not shown) is the same as the polarity of the video signal applied to the twelfth pixel. Also in this case, as in the first embodiment, a logic circuit is combined with the polarity control signal generation circuit 8 and the polarity change and output timing of the video signal for each pixel are arbitrarily controlled to control the polarity change of the video signal. I have.

According to the liquid crystal display device driving method of the third embodiment, the boundary between groups, that is, the position where the polarity of the video signal changes within one frame changes for each frame. Therefore, flicker can be further reduced, and
High-quality display with little crosstalk can be realized with low power consumption.

In the present embodiment, the boundary between the groups is shifted by three pixels for each frame, but the shift is not limited to three pixels.

Fourth Embodiment Next, a fourth embodiment of the method for driving a liquid crystal display device according to the present invention will be described with reference to the drawings. In this embodiment, in addition to the method for driving the liquid crystal display device described in Embodiment 1, the number of pixels included in one group in one frame is changed for each group.

FIG. 4 is an explanatory view showing another example of the liquid crystal display device. FIG. 4 is shown for explaining Embodiment 4 of the driving method of the liquid crystal display device of the present invention. Note that the liquid crystal display device shown in FIG. 4 is the same as the liquid crystal display device of the first embodiment, and the same portions as those in FIG. 1 are denoted by the same reference numerals. As shown in FIG. 4, the twelve pixels provided on the leftmost side of the paper have four pixels, two pixels, four pixels, and two pixels from the top in the column direction, and the number of pixels forming one group is regular. Has been changed.

For example, 1 is provided on the leftmost side of the drawing.
Two pixels are 1 to 4 and 7 to 10 from the top in the column direction.
The polarity of the video signal applied to the pixel is positive,
The polarities of the video signals applied to the fifth, sixth, eleventh, and twelfth pixels are negative. In order to regularly change the number of pixels constituting one group in this way, a logic circuit is synthesized with the polarity control signal generation circuit 8 to arbitrarily control the polarity change and output timing of the video signal for each pixel. I do.

According to the driving method of the liquid crystal display device of the fourth embodiment, since the period in which the polarity of the video signal changes is dispersed, flicker can be further reduced, and high-quality display with less crosstalk can be achieved. It can be realized with power consumption.

Fifth Embodiment Next, a fifth embodiment of the method of driving a liquid crystal display device according to the present invention will be described with reference to the drawings. In this embodiment, in addition to the driving method of the liquid crystal display device described in Embodiment 1, in one frame, the number of pixels included in one group is randomly changed for each group.

FIG. 5 is an explanatory view showing another example of the liquid crystal display device. FIG. 5 is shown for explaining Embodiment 5 of the driving method of the liquid crystal display device of the present invention. The liquid crystal display device shown in FIG. 5 is the same as the liquid crystal display device of the first embodiment, and the same portions as those in FIG. 1 are denoted by the same reference numerals. As shown in FIG. 5, the 12 pixels provided on the leftmost side of the paper have three, four, two and three pixels from the top in the column direction, and the number of pixels forming one group is irregular. Has been changed.

For example, 1 is provided on the leftmost side of the drawing.
In the two pixels, the polarity of the video signal applied to the first to third, eighth, and ninth pixels from the top in the column direction is negative, and
The polarity of the video signal applied to the seventh and tenth to twelfth pixels is positive. In order to irregularly change the number of pixels constituting one group in this way, a random pattern generation circuit is provided in the polarity control signal generation circuit 8 to irregularly change the polarity and output timing of the video signal for each pixel. To control.

According to the driving method of the liquid crystal display device of the fifth embodiment, the period in which the polarity of the video signal changes is randomly dispersed, so that flicker can be further reduced and high-quality display with little crosstalk can be achieved. Can be realized with low power consumption.

Embodiment 6 Next, a sixth embodiment of the method for driving a liquid crystal display device of the present invention will be described with reference to the drawings. In this embodiment mode, in addition to the method for driving the liquid crystal display device described in Embodiment Modes 1, 2, 3, 4, and 5, a limit is set on the number of pixels included in one group.

FIG. 6 is a block diagram showing an example of a control signal generation circuit used to realize the driving method of the liquid crystal display device of the present invention. In FIG. 6, reference numeral 6 denotes a random pattern generation circuit, and reference numeral 7 denotes a modulation circuit.

As an example of a method for setting a limit on the number of pixels constituting one group, a control signal (hereinafter, referred to as a "signal" used to randomly change the number of pixels constituting one group for each group). Random Pattern Signal ") is converted to MFM (Modified Flequency Modulation)
Alternatively, it can be easily realized by performing modulation using 2-7 RLL (Run Length Limited) modulation or the like.

The random pattern generation circuit 6 is a circuit for generating a random pattern signal, and the modulation circuit 7 is a circuit for modulating the random pattern signal by MFM or 2-7 RLL. MFM and 2-7RLL are general modulation methods used for magnetic disks and the like. Further, the modulation circuit 7 outputs a signal used for controlling the polarity of the video signal (hereinafter, referred to as a “video signal polarity control signal”).

According to the driving method of the liquid crystal display device of the sixth embodiment, the period in which the polarity of the video signal changes is randomly dispersed, so that flicker can be greatly reduced and high image quality with little crosstalk can be obtained. Since display can be realized with low power consumption and the number of pixels constituting one group is limited, it is possible to prevent a video signal of the same polarity from being applied for a long time, further reduce flicker, and deteriorate the liquid crystal. Can be prevented.

Seventh Embodiment Next, a seventh embodiment of the method for driving a liquid crystal display device according to the present invention will be described with reference to the drawings. In this embodiment, in addition to the method for driving the liquid crystal display device described in Embodiments 1, 2, 3, 4, 5, or 6, the number of rows selected at the same time is at least two.

FIG. 7 is a timing chart showing signals used in the seventh embodiment of the method for driving a liquid crystal display device according to the present invention. On the paper, the horizontal direction indicates time, and the vertical direction indicates voltage values. FIG. 7 shows, from the top, a vertical clock signal for controlling the timing of changing a video signal to display a predetermined video, a video signal polarity control signal,
Indicates a line signal. As the line signals, only the line signals applied to certain five line signal lines in the liquid crystal display device are shown, and the line signals applied to the (p−2) -th line signal lines from the top are shown in FIG. In the drawing, a “p−2 line”), a line signal applied to a (p−1) th line signal line (shown as “p−1 line” in the figure), and a p-th line signal line Line signal (shown as “p line” in the figure), a line signal applied to the (p + 1) th line signal line (shown as “p + 1 line” in the figure), and applied to the (p + 2) th line signal line Line signals (in the figure, indicated as “p + 2 lines”) are shown. Note that p is 0 or a natural number.

Each time the vertical clock signal switches from high level to low level, a predetermined line signal line is sequentially selected. TFT connected to selected line signal line
The video signal is applied to the pixel including the pixel via the video signal line. That is, if one line signal line is selected, one row of pixels is selected, and if two line signal lines are selected, two rows of pixels are selected. Note that, here, an example is shown in which a predetermined line signal line is sequentially selected each time the vertical clock signal switches from high level to low level, but every time the vertical clock signal switches from low level to high level. The same applies when the line signal lines are sequentially selected or when the line signal lines are sequentially selected at the bipolar inversion edge such as when the vertical clock signal switches from high level to low level and from low level to high level. The predetermined line signal lines are sequentially selected on the basis of the polarity inversion edge serving as the control reference of the vertical clock signal.

Referring to FIG. 7, at the first timing from the left, when the vertical clock signal switches from high level to low level (hereinafter referred to as “switching timing”), the p-2 line switches to high level. So
The p-2th line signal line is selected (although not shown, at least one line signal other than the p-2 line, the p-1 line, the p line, the p + 1 line, and the p + 2 line has a high level). Has been switched to.) That is, at the first switching timing from the left side, one row of pixels related to the (p−2) th line signal line is selected. Also, at the second switching timing from the left, the p-2 line is continuously at the high level, and the p-1 line is switched to the high level. That is, at the second switching timing from the left, pixels in two rows related to the (p-2) th line signal line and the (p-1) th line signal line are selected.

The polarity of the video signal applied to each pixel is determined by the level of the video signal polarity control signal. In this specification, for example, it is assumed that the polarity of the video signal becomes positive when the video signal polarity control signal is at a high level.
In this case, a positive polarity video signal is applied to the pixels constituting the selected row from the first switching timing from the left to the fourth switching timing from the left. Further, a video signal having a negative polarity is applied to the pixels constituting the selected row from the fourth switching timing from the left to the seventh switching timing from the left.

Therefore, from the first switching timing from the left to the second switching timing from the left, the video signal applied to the pixels related to the other line signal lines to obtain a desired display is changed to the (p-2) th video signal. It can also be applied to pixels related to the line signal line. Further, from the second switching timing from the left to the third switching timing from the left, a video signal for obtaining a desired display can be applied to the pixels related to the (p-2) th line signal line. As a result, the pixel related to the (p−2) th line signal line can preliminarily charge the video signal from the first switching timing from the left to the second switching timing from the left. The driving method shown in FIG. 7 can be performed by synthesizing the logic circuits of the polarity control signal generation circuit.

According to the driving method of the liquid crystal display device of the seventh embodiment, high-quality display with less flicker and crosstalk can be realized with low power consumption, and the charging time for the pixels becomes longer, resulting in higher-quality display. Can be realized.

Eighth Embodiment Next, an eighth embodiment of a method of driving a liquid crystal display device according to the present invention will be described with reference to the drawings.

The eighth embodiment differs from the seventh embodiment in that the video signal is not continuously applied to the pixels related to the same line signal line at the time of the polarity inversion edge serving as the control reference of the vertical clock signal. The other points are the same as those of the seventh embodiment.

In general, a shift register in a line driving circuit is controlled by a polarity inversion edge serving as a control reference of a vertical clock signal, and line signals are sequentially output and selected for each line signal line. Further, in synchronization with this, a predetermined video signal of the pixel of each line is output from the signal drive circuit, and is applied to each pixel via the video signal line and the TFT. At this time, for example, when two line signal lines are selected at the same time, after the pixel related to the next line signal line is precharged by the video signal for the signal line of the previous line, the original video signal is Since the pixels related to the signal lines are charged, the pixels can be sufficiently charged, so that high image quality can be obtained. At this time, there is a case where the output of the signal drive circuit temporarily becomes indefinite when switching from the video signal for the previous line signal line to be precharged to the original video signal.

FIG. 8 is a timing chart showing signals used in the eighth embodiment of the driving method of the liquid crystal display device according to the present invention. On the paper, the horizontal direction indicates time, and the vertical direction indicates voltage values. FIG. 8 shows, from the top, a vertical clock signal, a video signal polarity control signal, p-2 line, p
-1 line, p line, p + 1 line and p + 2 line are shown.

As shown in FIG. 8, the p-2 line is set to the high level from the first switching timing from the left to the third switching timing from the left, and the second switching timing from the left is set. Then p
-2 line is low level. As a result, the video signal is not continuously applied to the pixel when the vertical clock signal switches from the high level to the low level, that is, where the output of the signal drive circuit becomes unstable. The driving method shown in FIG. 8 can be performed by synthesizing the logic circuits of the polarity control signal generation circuit.

According to the driving method of the liquid crystal display device of the eighth embodiment, high-quality display with less flicker and crosstalk can be realized with low power consumption, and the charging time for the pixels becomes longer, resulting in higher-quality display. Display can be realized. Further, a video signal having a predetermined magnitude and polarity voltage value can be applied to each pixel.

Ninth Embodiment Next, a ninth embodiment of a method of driving a liquid crystal display device according to the present invention will be described with reference to the drawings.

In the ninth embodiment, the polarity of the video signal applied to each pixel in order to perform preliminary charging is always the same as the polarity of the video signal applied to each pixel in order to obtain a desired display. This embodiment is different from the eighth embodiment in the point, and the other points are the same as the eighth embodiment.

FIG. 9 is a timing chart showing signals used in the ninth embodiment of the driving method of the liquid crystal display device of the present invention. On the paper, the horizontal direction indicates time, and the vertical direction indicates voltage values. FIG. 9 shows, from the top, a vertical clock signal, a video signal polarity control signal, p-2 line, p
-1 line, p line, p + 1 line and p + 2 line are shown.

For example, referring to the p + 1 line, preliminary charging is performed from the second switching timing from the left to the third switching timing from the left. Therefore, the polarity of the video signal applied when performing preliminary charging is applied during the period from the fifth switching timing from the left to the sixth switching timing from the left in order to obtain a predetermined video. Video signal polarity. The driving method shown in FIG. 9 can be performed by synthesizing the logic circuits of the polarity control signal generation circuit.

According to the driving method of the liquid crystal display device of the ninth embodiment, high-quality display with less flicker and crosstalk can be realized with low power consumption, and the charging time for the pixels becomes longer, resulting in higher-quality display. In addition to realizing display, it is possible to prevent pre-charging by a video signal of the opposite polarity, and prevent poor charging.

Tenth Embodiment Next, a tenth embodiment of the method of driving a liquid crystal display device according to the present invention will be described with reference to the drawings.

In the tenth embodiment, when the polarity of the video signal applied to each pixel for performing preliminary charging is different from the polarity of the video signal applied to each pixel to obtain a desired display, The present embodiment is different from the seventh embodiment in that no special charging is performed, and is otherwise the same as the seventh embodiment.

FIG. 10 is a timing chart showing signals used in the driving method of the liquid crystal display device according to the tenth embodiment of the present invention. On the paper, the horizontal direction indicates time, and the vertical direction indicates voltage values. FIG. 10 shows, from the top, the vertical clock signal, video signal polarity control signal, p-2 line, p-1 line, p line, p + 1 line, and p + line.
Two lines are shown.

The p-line is not at the high level from the third switching timing from the left to the fourth switching timing from the left. That is, the pixels related to the p-th line signal line are not preliminarily charged.
However, according to FIG. 3, in the (m + 1) -th frame, a video signal having the same polarity as that of the (m + 1) -th frame is applied to a pixel having a polarity different from that of the immediately upper pixel, for example, a pixel in the fourth row from the top. . Therefore, no preliminary charging is required for the (m + 1) th frame. The driving method shown in FIG. 10 can be performed by synthesizing the logic circuits of the polarity control signal generation circuit.

Therefore, according to the driving method of the liquid crystal display device of the tenth embodiment, a high-quality display with less flicker and crosstalk can be realized with low power consumption, and the charging time for the pixels becomes longer, resulting in higher image quality. The display of the image quality can be realized, and the preliminary charging by the video signal of the opposite polarity can be prevented, and the charging failure can be prevented.

However, it is more preferable that the video signal of the same polarity is applied to the pixel for which the preliminary charging is not performed in the previous frame since the video signal can be sufficiently charged to all the pixels. .

Embodiment 11 In Embodiments 1 to 10 described above, a plurality of pixels are divided into a plurality of groups each including at least two pixels in the column direction. However, in the row direction, the plurality of pixels may be divided into a plurality of groups each including at least two pixels, and the polarity of the video signal may be changed for each group. Further, in the column direction and the row direction, the plurality of pixels may be divided into a plurality of groups each including at least two pixels, and the polarity of the video signal may be changed for each of the groups. In order to divide a plurality of pixels into a plurality of groups each including at least two pixels in the column direction and / or the row direction, a control circuit for setting the polarity of the video signal to a predetermined polarity may be provided in the signal driving circuit. .

Twelfth Embodiment FIGS. 11, 12 and 13 are explanatory views showing an example of the liquid crystal display device of the present invention, and the reference numerals shown in FIG. For the sake of explanation, only 6 × 2 pixels are shown, and the polarity control signal generation circuit is not shown. FIG. 11 shows the polarity of a video signal applied to each pixel of the liquid crystal display device in a certain frame (m frame). As shown in FIG. 12, from m + 1 frame, m
In a set of k frames up to + k frames, 1
And the second row, the polarity of the video signal applied to all the pixels in order from the left is positive, and as shown in FIG. 13, in the set of k frames from m + k + 1 frame to m + 2k frame, In the first and second rows, the polarities of the video signals applied to all the pixels in order from the left are negative. Here, the third and subsequent rows from the top may have the same polarity as the first and second rows,
The polarity may be opposite, and the polarity of each pixel may be determined according to the driving method described in the first to tenth embodiments.

The number k is a natural number not exceeding m. Here, k may be constant or may be changed. Further, when changing, it may be changed based on a certain rule or may be changed irregularly.

As described above, a plurality of k frames are collectively set, and the polarity of the video signal applied to the pixel is changed for each set. , And the charging time can be extended, so that high-quality display can be realized.

FIGS. 14, 15 and 16 are explanatory views showing another example of the liquid crystal display device of the present embodiment, and the reference numerals shown in the drawings are the same as those in FIGS. FIG. 14 shows the polarity of the video signal applied to each pixel of the liquid crystal display device in a certain frame (m frame). As shown in FIG. 15, in the set of k frames from the (m + 1) th frame to the (m + k) th frame, in the first and second columns from the left, the polarities of the video signals applied to all the pixels in order from the top are positive. As shown in FIG. 16, in the set of k frames from the (m + k + 1) th frame to the (m + 2k) th frame, in the first and second columns from the left, the polarity of the video signal applied to all the pixels in order from the top is negative. is there.

As described above, a plurality of k frames are collectively set, and by changing the polarity of the video signal applied to the pixel for each set, a signal of the same polarity is applied to the same pixel over a plurality of frames. Since the application and charging time can be extended, high-quality display can be realized.

FIGS. 17, 18 and 19 are explanatory views showing still another example of the liquid crystal display device of the present embodiment, and the reference numerals shown in the drawings are common to those in FIGS. FIG. 17 shows the polarity of the video signal applied to each pixel of the liquid crystal display device in a certain frame (m frame). As shown in FIG. 18, in the set of k frames from the (m + 1) th frame to the (m + k) th frame, in the first row from the top,
From the left, the polarity of the video signal applied to each pixel is positive,
In the second row from the top, the polarity of the video signal applied to each pixel is negative, positive,
It alternates between negative and positive. As shown in FIG. 19, in the set from the (m + k + 1) th frame to the (m + 2k) th frame, a polarity exactly opposite to the polarity shown in FIG. 18 is applied.

As described above, in any of the driving methods described in the first to eleventh embodiments, a plurality of k frames are collectively set, and the polarity of the video signal applied to the pixel is changed for each set. be able to. Then, a signal of the same polarity is applied to the same pixel over a plurality of frames, and the charging time can be lengthened, so that high-quality display can be realized.

To control such a change in the polarity of the video signal over a plurality of frames, for example, a logic circuit for calculating a frame unit is added to the polarity control signal generation circuit 8 in the signal drive circuit 1 and the line drive circuit 2. This can be realized by adding a control circuit. The signal drive circuit 1 and the line drive circuit 2 are provided with a timing controller for adjusting the polarity of a video signal or a line signal. It can also be realized by adding a function of controlling a change in the polarity of a signal.

[0106]

According to the driving method of the liquid crystal display device according to the first aspect of the present invention, a predetermined video signal is applied to pixels constituting a selected row among a plurality of pixels arranged in a matrix. This is a driving method of a liquid crystal display device that displays an image, in which a plurality of pixels are divided into a plurality of groups each including at least two pixels in a column direction, and the polarity of a video signal is changed for each group. In addition, high-quality display with less flicker and crosstalk can be realized with low power consumption.

In the driving method of the liquid crystal display device according to the second aspect of the present invention, since the pixels constituting each group are changed for each frame, high-quality display with less flicker and crosstalk is provided. It can be realized with low power consumption.

Further, in the driving method of the liquid crystal display device according to the third aspect of the present invention, one group includes n pixels.
Since the boundary between groups is shifted by n-1 pixels for each frame, flicker can be further reduced and high-quality display with little crosstalk can be realized with low power consumption.

Further, in the driving method of the liquid crystal display device according to the fourth aspect of the present invention, in one frame, the number of pixels constituting one group is changed for each group, so that flicker is further reduced. A high-quality display with little crosstalk can be realized with low power consumption.

Further, in the driving method of the liquid crystal display device according to the fifth aspect of the present invention, since the number of pixels constituting the one group is regularly changed, flicker can be greatly reduced, and In addition, high-quality display with little crosstalk can be realized with low power consumption.

Further, in the driving method of the liquid crystal display device according to the sixth aspect of the present invention, since the number of pixels constituting the one group is changed irregularly, flicker can be greatly reduced, and In addition, high-quality display with little crosstalk can be realized with low power consumption.

Further, in the driving method of the liquid crystal display device according to the seventh aspect of the present invention, the number of pixels constituting the one group is limited, so that flicker can be greatly reduced and cross-talk can be reduced. High-quality display with less talk can be realized with low power consumption, and deterioration of the liquid crystal that occurs when a signal of the same polarity is applied to the pixel for a long time can be prevented.

Further, in the driving method of the liquid crystal display device according to the present invention, the number of rows selected simultaneously is at least two.
Therefore, high-quality display with less flicker and crosstalk can be realized with low power consumption, and the charging time to the pixels is longer, so that higher-quality display can be realized.

Further, in the driving method of a liquid crystal display device according to the ninth aspect of the present invention, the same row is selected before and after a polarity inversion edge serving as a control reference of a vertical clock signal for controlling a timing of changing the video signal. In this case, when the polarity of the vertical clock signal changes, the line signal for controlling the selected row is set to a low level in the row, so that high-quality display with little flicker and crosstalk can be performed with low power consumption. In addition, the charging time for the pixel is increased and a higher quality display can be realized, and a video signal having a voltage value of a predetermined magnitude and polarity can be applied to each pixel.

Further, in the driving method of the liquid crystal display device according to the present invention, since the polarity of the pixels constituting the simultaneously selected rows is the same in the column direction, high image quality with little flicker and crosstalk is obtained. Can be realized with low power consumption, and the charging time for the pixels can be prolonged, so that a higher-quality display can be realized. In addition, insufficient charging caused by charging video signals having different polarities can be reduced.

Further, in the driving method of the liquid crystal display device according to the present invention, the number of rows to be simultaneously selected is at least one, and the polarity of the pixels constituting the simultaneously selected rows is the same in the column direction. Therefore, high-quality display with less flicker and crosstalk can be realized with low power consumption, and insufficient charging caused by charging video signals having different polarities can be reduced.

According to a twelfth aspect of the present invention, in the method for driving a liquid crystal display device, a predetermined video signal is applied to a pixel constituting a selected row among a plurality of pixels arranged in a matrix, so that a predetermined video signal is applied. A method of driving a liquid crystal display device for displaying, in which a plurality of pixels are divided into a plurality of groups each including at least two pixels in a row direction and the polarity of a video signal is changed for each group, And high-quality display with little crosstalk can be realized with low power consumption.

According to a driving method of a liquid crystal display device of the present invention, a predetermined video signal is applied to a pixel constituting a selected row among a plurality of pixels arranged in a matrix, so that a predetermined video is applied. A method for driving a liquid crystal display device for displaying, wherein a plurality of pixels are divided into a plurality of groups each including at least two pixels in a column direction and a row direction, and the polarity of a video signal is changed for each group. Therefore, high-quality display with less flicker and crosstalk can be realized with low power consumption.

According to a driving method of a liquid crystal display device of the present invention, a predetermined video signal is applied by applying a predetermined video signal to pixels constituting a selected row among a plurality of pixels arranged in a matrix. A method of driving a liquid crystal display device for displaying, in which a plurality of pixels are collectively set in a plurality of frames in a column direction and a polarity of a video signal is changed for each set, so that a charging time is increased. High quality display can be realized.

In the liquid crystal display device driving method according to the fifteenth aspect of the present invention, since at least two rows are selected at the same time, high-quality display with little flicker and crosstalk is realized with low power consumption. it can.

In the method of driving a liquid crystal display device according to the present invention, the same row is selected before and after a polarity inversion edge serving as a control reference of a vertical clock signal for controlling a timing of changing the video signal. In this case, when the polarity of the vertical clock signal changes, the line signal for controlling the selected row is set to a low level in the row, so that high-quality display with little flicker and crosstalk can be performed with low power consumption. In addition, the charging time for the pixels is increased, and a higher-quality display can be realized. In addition, a video signal having a voltage value of a predetermined magnitude and polarity can be applied to each pixel.

According to the driving method of the liquid crystal display device of the present invention, since the polarities of the pixels constituting the simultaneously selected rows are the same in the column direction, a high image quality with less flicker and crosstalk is obtained. The display can be realized with low power consumption, the charging time for the pixels is long, and the display with higher image quality can be realized. In addition, the insufficient charging caused by charging the video signals having different polarities can be reduced.

In the liquid crystal display device driving method according to the eighteenth aspect of the present invention, the number of simultaneously selected rows is at least one, and the polarities of pixels constituting the simultaneously selected rows are the same in the column direction. Therefore, high-quality display with less flicker and crosstalk can be realized with low power consumption, and insufficient charging caused by charging video signals having different polarities can be reduced.

In the method of driving a liquid crystal display device according to the nineteenth aspect of the present invention, since the number of frames constituting the set is regularly changed, a high-quality display is realized by prolonging the charging time. it can.

In the driving method of the liquid crystal display device according to the twentieth aspect of the present invention, since the number of frames constituting the set is changed irregularly, a high charging time is realized and a high quality display is realized. it can.

According to a driving method of a liquid crystal display device of the present invention, a predetermined video signal is applied by applying a predetermined video signal to pixels constituting a selected row among a plurality of pixels arranged in a matrix. A method of driving a liquid crystal display device for displaying, in which a plurality of pixels are collectively set in a plurality of frames in a row direction and a polarity of a video signal is changed for each set, so that a charging time is increased. High quality display can be realized.

In the driving method of the liquid crystal display device according to the present invention, since the number of rows to be simultaneously selected is at least two, high-quality display with little flicker and crosstalk is realized with low power consumption. In addition to this, the charging time for the pixels is increased, and higher quality image display can be realized.

In the driving method of a liquid crystal display device according to the twenty-third aspect of the present invention, the same row is selected before and after a polarity inversion edge serving as a control reference of a vertical clock signal for controlling a timing of changing the video signal. In this case, when the polarity of the vertical clock signal changes, a line signal for controlling a selected row is set to a low level in the row, so that high-quality display with little flicker and crosstalk can be performed with low power consumption. In addition, the charging time for the pixels is increased, and a higher-quality display can be realized. In addition, a video signal having a voltage value of a predetermined magnitude and polarity can be applied to each pixel.

According to the driving method of the liquid crystal display device of the present invention, since the polarities of the pixels constituting the simultaneously selected rows are the same in the column direction, high image quality with little flicker and crosstalk is obtained. The display can be realized with low power consumption, the charging time for the pixels is long, and the display with higher image quality can be realized. In addition, the insufficient charging caused by charging the video signals having different polarities can be reduced.

In the method of driving a liquid crystal display device according to the twenty-fifth aspect of the present invention, the number of rows selected simultaneously is at least one, and the polarities of the pixels constituting the simultaneously selected rows are the same in the column direction. Therefore, high-quality display with less flicker and crosstalk can be realized with low power consumption, and insufficient charging caused by charging video signals having different polarities can be reduced.

In the method of driving a liquid crystal display device according to the twenty-sixth aspect of the present invention, since the number of frames constituting the set is regularly changed, a high-quality display is realized by prolonging the charging time. it can.

In the driving method of the liquid crystal display device according to the twenty-seventh aspect of the present invention, since the number of frames constituting the set is changed irregularly, a high charging time is realized to realize a high quality display. it can.

A liquid crystal display device according to a twenty-eighth aspect of the present invention provides a signal driving circuit for driving a video signal, a line driving circuit for driving a line signal, and a polarity control signal generating circuit for generating a control signal for changing the polarity of the video signal. Since at least a circuit is included and the polarity of the pixels forming one group is changed for each group by the control signal, high-quality display with little flicker and crosstalk can be realized with low power consumption.

A liquid crystal display device according to claim 29 of the present invention is a signal drive circuit for driving a video signal, a line drive circuit for driving a line signal, and a polarity control signal generating circuit for generating a control signal for changing the polarity of the video signal. Since at least a circuit is included and the number of pixels constituting one group is randomly changed for each group by the control signal, high-quality display with little flicker and crosstalk can be realized with low power consumption.

A liquid crystal display device according to a thirtieth aspect of the present invention includes at least a signal drive circuit for driving a video signal, a line drive circuit for driving a line signal, a random pattern generation circuit, and a modulation circuit. Is modulated through the modulation circuit, thereby limiting the number of pixels constituting one group and changing the number randomly for each group.
High-quality display with less flicker and crosstalk can be realized with low power consumption.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an example of a liquid crystal display device and illustrating a driving method of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing another example of the liquid crystal display device and illustrating a driving method of the liquid crystal display device according to the second embodiment of the present invention.

FIG. 3 is an explanatory diagram showing another example of the liquid crystal display device and illustrating a driving method of the liquid crystal display device according to the third embodiment of the present invention.

FIG. 4 is an explanatory diagram showing another example of the liquid crystal display device and illustrating the fourth embodiment of the method for driving the liquid crystal display device of the present invention.

FIG. 5 is an explanatory diagram showing another example of the liquid crystal display device and illustrating a driving method of the liquid crystal display device according to the fifth embodiment of the present invention.

FIG. 6 is an explanatory diagram showing another example of the liquid crystal display device and illustrating the sixth embodiment of the method for driving the liquid crystal display device of the present invention.

FIG. 7 is a timing chart showing signals used in a driving method of a liquid crystal display device according to a seventh embodiment of the present invention.

FIG. 8 is a timing chart showing signals used in Embodiment 8 of the method for driving a liquid crystal display device of the present invention.

FIG. 9 is a timing chart showing signals used in a ninth embodiment of a method for driving a liquid crystal display device of the present invention.

FIG. 10 is a timing chart showing signals used in a liquid crystal display device driving method according to a tenth embodiment of the present invention.

FIG. 11 shows another example of the liquid crystal display device.
FIG. 21 is an explanatory diagram shown for explaining Embodiment 12 of the driving method of the liquid crystal display device of the present invention.

FIG. 12 is an explanatory diagram showing another example of the liquid crystal display device and illustrating the twelfth embodiment of the method for driving the liquid crystal display device of the present invention.

FIG. 13 is an explanatory diagram showing another example of the liquid crystal display device and illustrating a driving method of the liquid crystal display device according to the twelfth embodiment of the present invention.

FIG. 14 is an explanatory diagram showing another example of the liquid crystal display device and illustrating the twelfth embodiment of the method for driving the liquid crystal display device of the present invention.

FIG. 15 is an explanatory diagram showing another example of the liquid crystal display device and illustrating the twelfth embodiment of the method for driving the liquid crystal display device of the present invention.

FIG. 16 is an explanatory diagram showing another example of the liquid crystal display device and illustrating the twelfth embodiment of the method for driving the liquid crystal display device of the present invention.

FIG. 17 is an explanatory diagram showing another example of the liquid crystal display device and illustrating the twelfth embodiment of the method for driving the liquid crystal display device of the present invention.

FIG. 18 is an explanatory diagram showing another example of the liquid crystal display device and illustrating the twelfth embodiment of the method for driving the liquid crystal display device of the present invention.

FIG. 19 is an explanatory diagram showing another example of the liquid crystal display device and illustrating the twelfth embodiment of the method for driving the liquid crystal display device of the present invention.

FIG. 20 is an explanatory view showing another example of the liquid crystal display device and showing an example of the conventional liquid crystal display device.

FIG. 21 is an explanatory view showing another example of a conventional liquid crystal display device.

[Explanation of symbols]

1 signal drive circuit, 2 line drive circuit, 3 video signal lines, 4 line signal lines, 5 pixels.

Claims (30)

[Claims] 1. A method for driving a liquid crystal display device that displays a predetermined image by applying a predetermined image signal to pixels constituting a selected row among a plurality of pixels arranged in a matrix, comprising: , A plurality of pixels are divided into a plurality of groups each including at least two pixels, and a polarity of a video signal is changed for each group. 2. The method according to claim 1, wherein the pixels constituting each group are changed for each frame. 3. The driving method for a liquid crystal display device according to claim 1, wherein one group includes n pixels, and a boundary between the groups is shifted by n−1 pixels for each frame. 4. The method according to claim 1, wherein in one frame, the number of pixels forming one group is changed for each group. 5. The driving method for a liquid crystal display device according to claim 4, wherein the number of pixels forming said one group is changed regularly. 6. The driving method for a liquid crystal display device according to claim 4, wherein the number of pixels forming said one group is changed irregularly. 7. The driving method for a liquid crystal display device according to claim 6, wherein the number of pixels constituting one group is limited. 8. The method according to claim 1, wherein the number of rows selected at a time is at least two. 9. When the same row is selected before and after a polarity inversion edge serving as a control reference of a vertical clock signal for controlling a timing of changing the video signal, when the polarity of the vertical clock signal changes, the row is selected. 9. The driving method for a liquid crystal display device according to claim 8, wherein a line signal for controlling a row to be selected is set to a low level. 10. The driving method for a liquid crystal display device according to claim 9, wherein the polarities of pixels constituting the simultaneously selected rows are the same in a column direction. 11. The number of rows selected simultaneously is at least one.
8. The driving method for a liquid crystal display device according to claim 1, wherein the polarities of pixels constituting a row selected at the same time are the same in the column direction. 12. A driving method of a liquid crystal display device for displaying a predetermined image by applying a predetermined image signal to pixels constituting a selected row among a plurality of pixels arranged in a matrix, comprising: , A plurality of pixels are divided into a plurality of groups each including at least two pixels, and a polarity of a video signal is changed for each group. 13. A method for driving a liquid crystal display device, which displays a predetermined image by applying a predetermined image signal to pixels constituting a selected row among a plurality of pixels arranged in a matrix, comprising: And a method of driving a liquid crystal display device in which a plurality of pixels are divided into a plurality of groups each including at least two pixels in a row direction, and a polarity of a video signal is changed for each group. 14. A method of driving a liquid crystal display device that displays a predetermined image by applying a predetermined image signal to pixels constituting a selected row among a plurality of pixels arranged in a matrix, the method comprising: , A method of driving a liquid crystal display device, wherein a plurality of pixels are collectively set in a plurality of frames, and the polarity of a video signal is changed for each set. 15. The number of rows selected simultaneously is at least two.
The method for driving a liquid crystal display device according to claim 14, wherein: 16. When selecting the same row before and after a polarity inversion edge serving as a control reference of a vertical clock signal for controlling the timing of changing the video signal, when the polarity of the vertical clock signal changes, the row is selected. 16. The driving method for a liquid crystal display device according to claim 15, wherein a line signal for controlling a row to be selected is set to a low level. 17. The driving method of a liquid crystal display device according to claim 16, wherein the polarities of the pixels constituting the simultaneously selected rows are the same in the column direction. 18. The method of claim 1, wherein the number of simultaneously selected rows is at least one.
15. The driving method of a liquid crystal display device according to claim 14, wherein the polarities of pixels constituting a row selected at the same time are the same in the column direction. 19. The method according to claim 14, wherein the number of frames forming the set is changed regularly. 20. The method according to claim 14, wherein the number of frames constituting the set is changed irregularly. 21. A method for driving a liquid crystal display device that displays a predetermined image by applying a predetermined image signal to pixels constituting a selected row among a plurality of pixels arranged in a matrix, the method comprising: , A method for driving a liquid crystal display device, wherein a set is composed of a plurality of frames and the polarity of a video signal is changed for each set. 22. The number of rows selected simultaneously is at least two.
22. The method for driving a liquid crystal display device according to claim 21, wherein: 23. When the same row is selected before and after a polarity inversion edge serving as a control reference of a vertical clock signal for controlling a timing of changing the video signal, when the polarity of the vertical clock signal changes, the row is selected. 23. The driving method of a liquid crystal display device according to claim 22, wherein a line signal for controlling a row to be selected is set to a low level. 24. The driving method of a liquid crystal display device according to claim 23, wherein the polarities of pixels constituting the simultaneously selected rows are the same in a column direction. 25. The number of rows selected simultaneously is at least one.
22. The driving method of a liquid crystal display device according to claim 21, wherein the polarities of pixels constituting a row selected at the same time are the same in the column direction. 26. The method according to claim 21, wherein the number of frames forming the set is changed regularly. 27. The method according to claim 21, wherein the number of frames constituting the set is irregularly changed. 28. At least a signal drive circuit for driving a video signal, a line drive circuit for driving a line signal, and a polarity control signal generation circuit for generating a control signal for changing the polarity of the video signal, wherein one of the control signals A liquid crystal display device in which the polarity of the pixels constituting a group is changed for each group. 29. At least one of a signal driving circuit for driving a video signal, a line driving circuit for driving a line signal, and a polarity control signal generating circuit for generating a control signal for changing the polarity of the video signal, wherein one A liquid crystal display device in which the number of pixels constituting a group is randomly changed for each group. 30. A signal drive circuit for driving a video signal, a line drive circuit for driving a line signal, a random pattern generation circuit, and a modulation circuit, wherein an output of the random pattern generation circuit is modulated via the modulation circuit. Thus, a liquid crystal display device in which the number of pixels constituting one group is restricted and the number is randomly changed for each group.