WO2014010010A1 - Device for driving liquid-crystal panel, method for driving liquid-crystal panel, and liquid-crystal display device - Google Patents

Description

Liquid crystal panel driving device, liquid crystal panel driving method, and liquid crystal display device

The present invention relates to a liquid crystal panel driving device, a liquid crystal panel driving method, and a liquid crystal display device.

The background art of the present invention will be described with reference to FIGS. FIG. 8 is a configuration diagram illustrating an example of the liquid crystal display device 200. FIG. 9 is a timing chart showing an example of the generation timing of the vertical scanning timing pulse in the liquid crystal panel 4 of FIG. FIG. 10 is a chart showing an example of the horizontal line scanning order on the liquid crystal panel 4 of FIG. FIG. 11 is an image diagram and a visual image diagram of a moving image in which a vertical line moves from right to left as viewed in the figure. FIG. 12 is an image diagram and a visual image diagram of the moving image in the video wall in which the moving image of FIG. 11 and the moving image of FIG. And FIG. 13 is an image figure at the time of visually recognizing the moving image shown in FIG. 8 to 13 are drawings created by the present applicant in order to explain the background art of the present invention.

The liquid crystal display device 200 shown in FIG. 8 includes a vertical drive circuit 3, a liquid crystal panel 4, a sample hold circuit 5, and a horizontal drive circuit 9. The liquid crystal display device 200 configures, for example, a liquid crystal monitor or a liquid crystal projector. The liquid crystal panel 4 includes a glass substrate, a common electrode, a liquid crystal layer, a polarizing plate, and the like (not shown). The liquid crystal panel 4 further includes a plurality of row electrodes 41 arranged in parallel in the vertical direction (up and down direction in the figure) and a plurality of column electrodes 42 arranged in parallel in the horizontal direction (left and right direction in the figure). And have. A pixel electrode 44 and a thin film transistor 43 are provided at each intersection of the plurality of row electrodes 41 and the plurality of column electrodes 43. The drain terminal of the thin film transistor 43 is connected to the pixel electrode 44. Each pixel (that is, each basic unit for image display) included in the liquid crystal panel 4 is formed by the configuration of the pixel electrode 44, the thin film transistor 43, and the like. The display state of each pixel is controlled by changing the applied voltage between the common electrode facing the pixel electrode 44 by the switching operation of the thin film transistor 43. Each gate terminal of the plurality of thin film transistors 43 arranged in the horizontal direction is commonly connected to one of the plurality of row electrodes 41. Each source terminal of the plurality of thin film transistors 43 arranged in the vertical direction is commonly connected to one of the plurality of column electrodes 43.

The vertical drive circuit 3 selects the row electrode 41 to be driven based on, for example, the horizontal synchronization signal 7 and the vertical synchronization signal 8 input from the outside. The vertical drive circuit 3 drives the row electrode 41 by outputting a vertical scanning timing pulse having a predetermined voltage to the selected row electrode 41. By outputting the vertical scanning timing pulse, each thin film transistor 43 whose gate terminal is connected to the row electrode 41 from which the vertical scanning timing pulse is output is turned on. Each row electrode 41 corresponds to each horizontal line in the horizontal scanning of the liquid crystal panel 4. In this example, horizontal line numbers of 1, 2, 3,..., N−2, n−1, and n shown in parentheses in order from the top are given to the row electrodes 41. However, in this case, n is an integer and is a multiple of 12. Hereinafter, the row electrode 41 may be referred to as a horizontal line.

The horizontal drive circuit 9 selects a column electrode 42 to be driven based on, for example, a horizontal synchronization signal 10 and a clock signal 11 input from the outside, and a predetermined selection signal indicating the selected column electrode 42 is sampled and held by the sample hold circuit 5. Output for. The sample hold circuit 5 has a plurality of registers corresponding to the column electrodes 42 and applies a voltage corresponding to the value stored in each register to each column electrode 42. The plurality of registers included in the sample hold circuit 5 stores, for example, one horizontal line of the video signal 6 input from the outside.

Next, an example of the horizontal line scanning order on the liquid crystal panel 4 in the liquid crystal display device 200 of FIG. 8 will be described with reference to FIGS. In the example shown in FIGS. 9 and 10, in the driving of each row electrode 41 and each column electrode 42 of the liquid crystal panel 4 in FIG. 8, the vertical scanning starts from the upper end of the panel surface of the liquid crystal panel 4, and one horizontal line This is an example that is sequentially performed every time and reaches the lower end. That is, in this example, as shown in FIG. 10, the vertical drive circuit 3 has the same horizontal line number and the horizontal line scanning order on the liquid crystal panel, and each row electrode 41 of the horizontal line numbers 1 to n, that is, The horizontal lines are sequentially scanned in the order of the horizontal line numbers.

FIG. 9 is a timing chart showing vertical scanning timing pulses and the like output from the vertical drive circuit 3 when n pulses are input as the horizontal synchronizing signal 7 during one cycle of the vertical synchronizing signal 8. FIG. 9 shows which horizontal line number of the horizontal line the vertical drive circuit 3 outputs a vertical scanning timing pulse in synchronization with each pulse of the horizontal synchronization signal 7. In the example shown in FIG. 9, n pulses are input to the vertical drive circuit 3 as the horizontal synchronization signal 7 in one cycle of the vertical synchronization signal 8. In synchronism with each pulse of the horizontal synchronization signal 7, the vertical drive circuit 3 selects horizontal lines numbered 1 to n in the order of the numbers, and outputs a vertical scanning timing pulse to the selected horizontal line.

For example, the horizontal line with the horizontal line number 1 is selected in the first scanning order. The horizontal line with the horizontal line number 2 is selected in the second scanning order. The horizontal line with the horizontal line number 3 is selected in the third scanning order. Thereafter, similarly, the horizontal lines with the horizontal line numbers 3 to 8 are selected in the 3rd to 8th scanning order.

Similarly, the horizontal line with the horizontal line number n / 2-3 is selected in the n / 2-3th scanning order. The horizontal line with the horizontal line number n / 2-2 is selected in the n / 2-2th scanning order. The horizontal line with the horizontal line number n / 2-1 is selected in the n / 2-1st scanning order. The horizontal line with the horizontal line number n / 2 is selected in the n / 2th scanning order. The horizontal line number n / 2 + 1 is selected in the (n / 2 + 1) th scanning order. The horizontal line with the horizontal line number n / 2 + 2 is selected in the n / 2 + 2th scanning order. The horizontal line number n / 2 + 3 is selected in the n / 2 + 3th scanning order. The horizontal line of the horizontal line number n / 2 + 4 is selected in the n / 2 + 4th scanning order.

Similarly, the horizontal line with the horizontal line number n-7 is selected in the n-7th scanning order. The horizontal line with the horizontal line number n-6 is selected in the n-6th scanning order. The horizontal line with the horizontal line number n-5 is selected in the n-5th scanning order. The horizontal line with the horizontal line number n-4 is selected in the n-4th scanning order. The horizontal line with the horizontal line number n-3 is selected in the n-3th scanning order. The horizontal line with the horizontal line number n-2 is selected in the (n-2) th scanning order. The horizontal line with the horizontal line number n-1 is selected in the (n-1) th scanning order. Then, the horizontal line with the horizontal line number n is selected in the nth scanning order.

Next, a display example of a moving image on the liquid crystal panel 4 when each horizontal line is scanned in the scanning order described with reference to FIGS. 9 and 10 will be described with reference to FIG. FIG. 11 (reference (a)) represents a moving image represented by the video signal 6 in this display example. The display example shown in FIG. 11 (symbol (a)) is a moving image in which a black background image is displayed on the liquid crystal panel 4 and the two white vertical lines 4a move from right to left. Here, the arrow is a symbol indicating the moving direction, and is not an image displayed on the liquid crystal panel 4. 11 (symbol (b)) is an image of a moving image recognized when the viewer views the liquid crystal panel 4 when the moving image shown in FIG. 11 (symbol (a)) is displayed on the liquid crystal panel 4. That is, it represents a visual image.

In a general liquid crystal panel, it takes a time from several milliseconds to several tens of milliseconds to switch the display state from black to white or from white to black. As described with reference to FIGS. 9 and 10, when each horizontal line is scanned sequentially from top to bottom, the moving image shown in FIG. 11 (reference (a)) is due to the response characteristics of the liquid crystal panel. As shown in FIG. 11 (reference (b)), the viewer will recognize. That is, as shown in FIG. 11 (symbol (a)), in a moving image in which the vertical line 4a moves in the horizontal direction on the screen, as shown in FIG. 11 (symbol (b)), the vertical line 4a The corresponding vertical line 4b appears to move with a delay in the lower part of the screen compared to the upper part of the screen. In the example shown in FIG. 11 (symbol (b)), the vertical line 4 b passes through the horizontal position at the upper end of the liquid crystal panel 4 and then the vertical line 4 b is the same horizontal at the lower end of the liquid crystal panel 4. It shows that the delay time until passing the position in the direction (that is, the difference in display response time) is T1.

Next, with reference to FIG. 12, a display example in which two liquid crystal panels 4 as shown in FIG. 11 are arranged vertically and horizontally and a moving picture as shown in FIG. 11 (reference (a)) is enlarged is described. To do. That is. FIG. 12 shows a visual image of a moving image on a video wall expanded on four sides. Here, the video wall is a display of a plurality of screens of a liquid crystal monitor or a liquid crystal projector arranged vertically and horizontally, and on each screen, a video corresponding to the position and size is displayed. This is a method for displaying an image. FIG. 12 (reference (a)) represents a moving image represented by the video signal 6 in this display example. In the display example shown in FIG. 12 (reference (a)), two white vertical lines 4c move from right to left on a black background image displayed on four liquid crystal panels 4. Shows a video to be played. Here, the arrow is a symbol indicating the moving direction, and is not an image displayed on the liquid crystal panel 4. FIG. 12 (symbol (b)) shows the case where the viewer views the four liquid crystal panels 4 when the moving image shown in FIG. 12 (symbol (a)) is displayed on the four liquid crystal panels 4. Represents a recognized video image. As shown in FIG. 12 (reference (b)), in each liquid crystal panel 4, the vertical line 4d is recognized with a certain delay time at the upper part and the lower part. Therefore, a relatively large shift is recognized in the vertical line 4d at the upper and lower boundary portions indicated by the broken-line circles.

For such an image, for example, the scanning delay of the upper part and the lower part in each liquid crystal panel can be reduced by scanning while skipping horizontal lines every plural lines. Patent Document 1 shows an example of a configuration in the case of scanning while skipping horizontal lines every plural lines. In such a configuration, for example, first, odd-numbered horizontal lines of the liquid crystal panel can be scanned sequentially from the top, and after reaching the bottom, the even-numbered horizontal lines can be scanned in the same manner. According to such a scanning method, the scanning delay between the upper part and the lower part of the screen is halved as compared with the case where scanning is performed in order for each horizontal line, and the display response time difference between the upper part and the lower part of the screen can be reduced visually. . FIG. 13 shows an example of an image image visually recognized when displayed in such a configuration. In FIG. 13, the white vertical lines 4a and 4c are moved from right to left in the black background image on the liquid crystal panel 4 as shown in FIG. 11 (reference (a)) and FIG. 12 (reference (a)). The image of the image visually recognized in the case of In FIG. 13, the visually recognized vertical line is shown as a vertical line 4 e. Moreover, the vertical line 4b shown in FIG. 11 (code | symbol (b)) is shown with the broken line. Here, the display response time difference T2 is the time difference between the upper part and the lower part when the even line and the odd line are scanned twice in the vertical direction. The display response time difference T1 is the time difference between the upper part and the lower part when the horizontal line is scanned in the vertical direction sequentially from top to bottom line by line. As shown in FIG. 13, the display response time difference T2 is as small as about one half of the display response time difference T1.

JP 2002-72977 A

As shown in FIG. 13, if a configuration in which a horizontal line is scanned as described in Patent Document 1 is used, the delay time generated between the upper part and the lower part of the liquid crystal panel can be reduced to some extent. However, in the video wall application, as shown in FIG. 12 (symbol (b)), when an image with a large change in display color, brightness, or the like is moved in the left-right direction of the liquid crystal panel 4, a plurality of screens are displayed. The difference between the upper and lower borders is remarkably visible in the adjacent part. Therefore, it has been a problem to improve the deterioration of the image quality of the moving image caused by this symptom.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a liquid crystal panel driving device, a liquid crystal panel driving method, and a liquid crystal display device capable of improving the image quality of a moving image to be displayed. .

The liquid crystal panel driving device of the present invention is provided at a plurality of intersections of the plurality of row electrodes arranged in parallel, the plurality of column electrodes arranged in parallel, and the plurality of row electrodes and the plurality of column electrodes. In a driving device for a liquid crystal panel having a plurality of pixels, each row electrode belongs to one of a plurality of groups composed of a plurality of adjacent row electrodes, and a predetermined row electrode is placed for each group while changing the group to be selected. And a row electrode selection means for sequentially selecting each row electrode to be driven.

The liquid crystal panel driving method of the present invention is provided at a plurality of intersections of a plurality of row electrodes arranged in parallel, a plurality of column electrodes arranged in parallel, and the plurality of row electrodes and the plurality of column electrodes. In a method for driving a liquid crystal panel having a plurality of pixels, each row electrode belongs to one of a plurality of groups of a plurality of adjacent row electrodes, and a predetermined row electrode is placed for each group while changing the group to be selected. In addition, each row electrode to be driven is sequentially selected.

A liquid crystal display device according to the present invention includes a plurality of row electrodes arranged in parallel, a plurality of column electrodes arranged in parallel, and a plurality of intersections of the plurality of row electrodes and the plurality of column electrodes. In a liquid crystal display device including a liquid crystal panel having pixels, each row electrode belongs to one of a plurality of groups of a plurality of adjacent row electrodes, and a predetermined row electrode is changed for each group while changing a group to be selected. In addition, it is characterized by comprising row electrode selection means for sequentially selecting each row electrode to be driven.

According to the present invention, it is possible to easily increase the degree of dispersion when the horizontal lines are selected by being dispersed as compared with the case where scanning is repeatedly performed in a predetermined direction for each of the plurality of horizontal lines. Thus, according to the present invention, the selection bias of the horizontal line can be reduced, and the display response time difference generated on the screen can be easily reduced.

It is the block diagram which showed the structural example of one embodiment of this invention. 2 is a timing chart showing an example of generation timing of a vertical scanning timing pulse in the liquid crystal panel 4 of FIG. 1. 4 is a chart showing an example of a horizontal line scanning order on the liquid crystal panel 4 of FIG. 1. FIG. 4 is a visual image diagram when a moving image in which a vertical line moves from right to left in the scanning order shown in FIG. 3 in the liquid crystal display device 100 of FIG. 1 is displayed. 6 is a timing chart showing another example of the generation timing of the vertical scanning timing pulse in the liquid crystal panel 4 of FIG. 6 is a chart showing another example of the horizontal line scanning order on the liquid crystal panel 4 of FIG. 1. FIG. 7 is a visual image diagram when a moving image in which a vertical line moves from right to left as viewed in the figure in the liquid crystal display device 100 of FIG. 1 in the scanning order shown in FIG. 6. It is the block diagram which showed an example of the liquid crystal display device. FIG. 9 is a timing chart showing an example of generation timing of a vertical scanning timing pulse in the liquid crystal panel 4 of FIG. 8. FIG. 10 is a chart showing an example of a horizontal line scanning order on the liquid crystal panel 4 of FIG. 8. It is an image figure of the moving image in which a vertical line moves from right to left as viewed in the figure. It is an image figure of the moving image in the video wall which expanded the moving image of FIG. 11 and the moving image of FIG. It is an image figure at the time of visually recognizing the moving image shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a liquid crystal display device as an embodiment of the present invention. 1, the same reference numerals are used for the same components as those shown in FIG. Compared with the liquid crystal display device 200 shown in FIG. 8, the liquid crystal display device 100 of this embodiment newly includes a frame memory 1 and a timing pulse generator 2. The liquid crystal display device 100 also changes the input signal of the vertical drive circuit 3 a corresponding to the vertical drive circuit 3 of FIG. 8 from the horizontal synchronization signal 7 and the vertical synchronization signal 8 to the output signal of the timing pulse generator 2. ing. The liquid crystal display device 100 configures, for example, a liquid crystal monitor or a liquid crystal projector.

In FIG. 1, a frame memory 1 is a memory having a memory capacity for storing video signals 6 for two vertical periods. The frame memory 1 is disposed in front of the sample and hold circuit 5. A video signal 6 is written in the frame memory 1. The video signal read from the frame memory 1 is input to the sample hold circuit 5. The readout timing of the video signal from the frame memory 1 is controlled by a readout timing control signal supplied from the timing pulse generator 2. While the video signal 6 is being written in the half of the frame memory 1, the video signal 6 written in one vertical period can be read from the other half of the memory. By writing and reading the video signal 6 to and from the frame memory 1 in this way, the video signal 6 of an arbitrary horizontal line can be read and stored in the sample and hold circuit 5 regardless of the order of writing. .

The timing pulse generator 2 scans the liquid crystal panel 4 by outputting a vertical scanning timing pulse to an arbitrary horizontal line at the driving timing of each horizontal line based on the horizontal synchronizing signal 7 and the vertical synchronizing signal 8. I do. At that time, the timing pulse generator 2 assigns each horizontal line to one of two groups consisting of a plurality of adjacent horizontal lines, and changes the group to be selected while setting the predetermined horizontal line for each group. Each horizontal line to be driven is sequentially selected. In that case, the timing pulse generator 2 sequentially selects each horizontal line to be driven at predetermined horizontal lines with a certain direction for each group.

Also, the vertical drive circuit 3a outputs a predetermined voltage to the selected horizontal line based on the horizontal line selection signal (ie, vertical scanning timing pulse) output from the timing pulse generator 2.

Here, an example of driving the liquid crystal panel 4 in the liquid crystal display device 100 of the present embodiment shown in FIG. 1 will be described with reference to FIGS. FIG. 2 is a timing chart showing an example of the generation timing of the vertical scanning timing pulse in the liquid crystal panel 4 of FIG. FIG. 3 is a chart showing an example of the horizontal line scanning order on the liquid crystal panel 4 of FIG. FIG. 4 is a visual image diagram when a moving image is displayed on the liquid crystal panel 4 of FIG. 1 in which vertical lines move from right to left as viewed in the figure.

In the present embodiment, n horizontal lines of horizontal line numbers 1 to n selected by the timing pulse generator 2 belong to one of two groups. In addition, the timing pulse generator 2 drives each horizontal line to be driven every other horizontal line in the direction from the central part to the peripheral part in the liquid crystal panel 4 while alternately changing the group to be selected. Are selected in sequence. However, n represents a horizontal line number. Also, n is an integer and is a multiple of 12.

That is, as shown in FIG. 2, in the present embodiment, among the n horizontal lines selected by the timing pulse generator 2, n / 2 horizontal lines with horizontal line numbers 1 to n / 2 are displayed. In addition to belonging to the first group, n / 2 horizontal lines with horizontal line numbers n / 2 + 1 to n are included in the second group. Then, the timing pulse generator 2 selects the horizontal line while alternately changing the selection target group between the first group and the second group.

At that time, in the first group, the timing pulse generator 2 selects a horizontal line every other horizontal line from the central part to the upper peripheral part in the vertical direction of the liquid crystal panel 4. In the first group, as shown by the dashed line arrow in FIG. 2, the selection starts from the n / 2nd horizontal line, and then the n / 2−2th horizontal line placed one horizontal line is selected. select. Thereafter, after selecting the fourth horizontal line, the second horizontal line with one horizontal line is selected. After selecting the second horizontal line, return to the center of the liquid crystal panel 4 again, select the n / 2-1st horizontal line, and then place the n / 2-3th Select a horizontal line. Then, after selecting the third horizontal line, the first horizontal line with one horizontal line is selected. In the next period of the vertical synchronizing signal 8, the timing pulse generator 2 starts selection from the n / 2th horizontal line again.

On the other hand, in the second group, the timing pulse generator 2 selects horizontal lines every other horizontal line from the central part to the lower peripheral part in the vertical direction of the liquid crystal panel 4. In the second group, as indicated by the two-dot chain line arrow in FIG. 2, the selection starts from the (n + 1) th horizontal line, and then selects the (n + 2 + 3) th horizontal line with one horizontal line. To do. Then, after selecting the (n-3) th horizontal line, the (n-1) th horizontal line with one horizontal line is selected. After selecting the (n-1) th horizontal line, the display returns to the center of the liquid crystal panel 4 again, selects the n / 2 + 2th horizontal line, and then places the n / 2 + 4th horizontal line with one horizontal line. Select. Then, after selecting the (n−2) th horizontal line, the nth horizontal line with one horizontal line is selected. In the next period of the vertical synchronizing signal 8, the timing pulse generator 2 starts selection again from the (n / 2 + 1) th horizontal line.

Further, as shown in FIGS. 2 and 3, the timing pulse generator 2 alternately selects the horizontal lines belonging to the first group and the horizontal lines belonging to the second group. That is, as shown in FIG. 3, for example, in the first scanning order, the horizontal line of the horizontal line number n / 2 belonging to the first group is selected. In the next second scanning order, the horizontal line of the horizontal line number n / 2 + 1 belonging to the second group is selected. In the third scanning order, the horizontal line of the horizontal line number n / 2-2 belonging to the first group is selected. In the fourth scanning order, the horizontal line of the horizontal line number n / 2 + 3 belonging to the second group is selected. Thereafter, similarly, the horizontal line belonging to the first group and the horizontal line belonging to the second group are alternately selected. In the first group, the horizontal line of the last horizontal line number 1 is selected for the (n-1) th. Next, in the second group, the nth horizontal line with the last horizontal line number n is selected.

In the driving of the liquid crystal panel 4 of the present embodiment, as shown in FIG. 3, scanning in the vertical direction starts from the n / 2nd horizontal line at the center of the screen, and then the n / 2 + 1th and n / 2−2nd. , Scanning is performed in the vertical direction of the screen every other horizontal line in the order of the n / 2 + 3th horizontal line. Then, after reaching each of the upper and lower ends, scanning is performed every other horizontal line in the same manner in the order of the n / 2-1st, n / 2 + 2nd, n / 2-3th, and n / 2 + 4th horizontal lines.

Referring to FIG. 4, the case of the present embodiment is compared with the case described with reference to FIG. 4 moves the white vertical lines 4a and 4c from right to left in the black background image on the liquid crystal panel 4 as shown in FIG. 11 (reference (a)) and FIG. 12 (reference (a)). The image of the image visually recognized in the case of In FIG. 4, the visually recognized vertical line is shown as a vertical line 4 f. Moreover, the vertical line 4b shown in FIG. 11 (code | symbol (b)) is shown with the broken line. As shown in FIG. 4, the scanning delay time T7 between the uppermost horizontal line and the lowermost horizontal line of the screen of the liquid crystal panel 4 is about one horizontal period (that is, one pulse period of the horizontal synchronizing signal 7). The difference in display response time between the upper and lower parts of the screen can be reduced visually. Further, the upper and lower scanning delay time T8 with respect to the center of the screen becomes about ¼ of the display response time difference T1 shown in FIG. 11 (reference (b)), and the bending of the screen moving image portion can be reduced visually.

Next, another example of driving the liquid crystal panel 4 in the liquid crystal display device 100 of the present embodiment shown in FIG. 1 will be described with reference to FIGS. FIG. 5 is a timing chart showing another example of the vertical scanning timing pulse generation timing in the liquid crystal panel 4 of FIG. FIG. 6 is a chart showing another example of the horizontal line scanning order on the liquid crystal panel 4 of FIG. FIG. 7 is a visual image diagram when a moving image is displayed on the liquid crystal panel 4 of FIG.

In the present embodiment, n horizontal lines of horizontal line numbers 1 to n selected by the timing pulse generator 2 belong to one of two groups. In addition, the timing pulse generator 2 drives each horizontal line that is driven every other horizontal line in the direction from the peripheral part to the central part of the liquid crystal panel 4 for each group while alternately changing the group to be selected. Are selected in sequence. That is, as shown in FIG. 5, in the present embodiment, among the n horizontal lines selected by the timing pulse generator 2, n / 2 horizontal lines with horizontal line numbers 1 to n / 2 are displayed. In addition to belonging to the first group, n / 2 horizontal lines with horizontal line numbers n / 2 + 1 to n are included in the second group. Then, the timing pulse generator 2 selects the horizontal line while alternately changing the selection target group between the first group and the second group.

At that time, in the first group, the timing pulse generator 2 selects horizontal lines every other horizontal line from the upper peripheral portion to the central portion in the vertical direction of the liquid crystal panel 4. In the first group, selection is started from the first horizontal line as shown by the one-dot chain line arrow in FIG. 5, and then the third horizontal line placed by one horizontal line is selected. After that, the n / 2−3th horizontal line is selected, and then the n / 2−1th horizontal line with one horizontal line is selected. After selecting the n / 2-1st horizontal line, return to the upper peripheral portion of the liquid crystal panel 4 again, select the second horizontal line, and then the fourth horizontal line placed one horizontal line Select. After that, the n / 2−2th horizontal line is selected, and then the n / 2th horizontal line placed one horizontal line is selected. In the next period of the vertical synchronizing signal 8, the timing pulse generator 2 starts selection from the first horizontal line again.

On the other hand, in the second group, the timing pulse generator 2 selects horizontal lines every other horizontal line from the lower peripheral part to the central part in the vertical direction of the liquid crystal panel 4. In the second group, as indicated by the two-dot chain line arrow in FIG. 5, selection starts from the nth horizontal line, and then the (n-2) th horizontal line placed one horizontal line is selected. After that, the n / 2 + 4th horizontal line is selected, and then the n / 2 + 2th horizontal line with one horizontal line is selected. After selecting the n / 2 + 2th horizontal line, the display returns to the lower peripheral portion of the liquid crystal panel 4 again, selects the (n-1) th horizontal line, and then puts the 1st horizontal line to the (n-3) th horizontal line. Select the horizontal line. After that, the n / 2 + 3th horizontal line is selected, and then the n / 2 + 1th horizontal line with one horizontal line is selected. In the next period of the vertical synchronizing signal 8, the timing pulse generator 2 starts selection from the nth horizontal line again.

Further, as shown in FIGS. 5 and 6, the timing pulse generator 2 alternately selects the horizontal lines belonging to the first group and the horizontal lines belonging to the second group. That is, as shown in FIG. 6, for example, in the first scanning order, the horizontal line of horizontal line number 1 belonging to the first group is selected. In the next second scanning order, the horizontal line number n belonging to the second group is selected. In the third scanning order, the horizontal line number 3 belonging to the first group is selected. In the fourth scanning order, the horizontal line of the horizontal line number n-2 belonging to the second group is selected. Thereafter, similarly, the horizontal line belonging to the first group and the horizontal line belonging to the second group are alternately selected. In the first group, the horizontal line with the (n-1) th horizontal line number n / 2 is selected. The Next, in the second group, the nth horizontal line with the last horizontal line number n / 2 + 1 is selected.

In the driving of the liquid crystal panel 4 of the present embodiment, as shown in FIG. 6, the vertical scanning starts from the first horizontal line on the screen, and then the nth, third, and n−2th horizontal lines. The scanning is performed from the upper and lower ends of each screen in the center direction every other horizontal line in the line order. Then, after reaching the center of the screen, scanning is performed every other horizontal line in the order of the second, n−1, fourth, and n−3 horizontal lines on the screen.

Referring to FIG. 7, the case of the present embodiment is compared with the case described with reference to FIG. 7 moves the white vertical lines 4a and 4c from right to left in the black background image on the liquid crystal panel 4 as shown in FIG. 11 (reference (a)) and FIG. 12 (reference (a)). The image of the image visually recognized in the case of In FIG. 7, the visually recognized vertical line is shown as a vertical line 4g. Moreover, the vertical line 4b shown in FIG. 11 (code | symbol (b)) is shown with the broken line. As shown in FIG. 7, the scanning delay time T11 between the uppermost horizontal line and the lowermost horizontal line of the screen of the liquid crystal panel 4 is about one horizontal period (that is, one pulse period of the horizontal synchronizing signal 7). The difference in display response time between the upper and lower parts of the screen can be reduced visually. Further, the scanning delay time T12 at the center of the screen with respect to the upper and lower sides of the screen becomes about 1/4 of the display response time difference T1 shown in FIG. 11 (reference (b)), and the bending of the screen moving image portion can be reduced visually.

Each scanning procedure described above is an example of the embodiment of the present invention, and the embodiment of the present invention is not limited to these. For example, the horizontal lines can belong to a plurality of groups of three or more, and the interval for selecting the horizontal lines in each group can be set to two or more horizontal lines instead of one horizontal line.

Further, a program for realizing the function of the timing pulse generator 2 in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read by a computer system and executed. Line selection and timing control may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” includes a medium that holds a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. Alternatively, the program may be stored in a predetermined server, and the program may be distributed (downloaded or the like) via a communication line in response to a request from another device.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within the scope not departing from the gist of the present invention.

In addition, the aspect of this invention can be expressed as the following supplementary notes 1 to 7.

DESCRIPTION OF SYMBOLS 100 Liquid crystal display device 1 Frame memory 2 Timing pulse generator 3a Vertical drive circuit 4 Liquid crystal panel 41 Row electrode (horizontal line)
42 Column electrode 43 Thin film transistor 44 Pixel electrode 5 Sample hold circuit 9 Horizontal drive circuit

Claims (8)

Driving a liquid crystal panel having a plurality of row electrodes arranged in parallel, a plurality of column electrodes arranged in parallel, and a plurality of pixels provided at a plurality of intersections of the plurality of row electrodes and the plurality of column electrodes In the device
Row electrode selection in which each row electrode belongs to one of a plurality of groups of adjacent row electrodes, and each row electrode to be driven is sequentially selected while changing the group to be selected and every predetermined row electrode for each group A liquid crystal panel drive device comprising: means. 2. The liquid crystal panel driving device according to claim 1, wherein the row electrode selection unit sequentially selects the row electrodes to be driven at predetermined row electrodes with a certain direction for each group. . Each row electrode belongs to one of two groups;
The row electrode selection means sequentially drives the row electrodes to be driven at predetermined row electrode positions in the direction from the central portion to the peripheral portion of the liquid crystal panel for each group while alternately changing the group to be selected. The liquid crystal panel driving device according to claim 1, wherein the driving device is selected. Each row electrode belongs to one of two groups;
The row electrode selecting means sequentially changes the groups to be selected and sequentially drives the row electrodes to be driven at predetermined row electrodes in the direction from the peripheral part to the central part of the liquid crystal panel for each group. The drive device for a liquid crystal panel according to claim 1, wherein the drive device is selected and driven. 5. The row electrode selection means selects the row electrode at the upper end of the liquid crystal panel and the row electrode at the lower end of the liquid crystal panel in succession. 5. Liquid crystal panel drive. Driving a liquid crystal panel having a plurality of row electrodes arranged in parallel, a plurality of column electrodes arranged in parallel, and a plurality of pixels provided at a plurality of intersections of the plurality of row electrodes and the plurality of column electrodes In the method
Each row electrode belongs to one of a plurality of groups composed of a plurality of adjacent row electrodes, and each row electrode to be driven is sequentially selected while changing the group to be selected and every predetermined row electrode for each group. A method for driving a liquid crystal panel. A liquid crystal panel having a plurality of row electrodes arranged in parallel, a plurality of column electrodes arranged in parallel, and a plurality of pixels provided at a plurality of intersections of the plurality of row electrodes and the plurality of column electrodes. In the liquid crystal display device
Row electrode selection in which each row electrode belongs to one of a plurality of groups of adjacent row electrodes, and each row electrode to be driven is sequentially selected while changing the group to be selected and every predetermined row electrode for each group A liquid crystal display device comprising: means. The liquid crystal display device according to claim 7, further comprising a plurality of the liquid crystal panels constituting one screen.

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