JPH0868984A - Liquid crystal driving method - Google Patents

Abstract

PURPOSE: To provide a liquid crystal driving method which prevents flickering and flow stripes by reversing scanning directions in the the odd number places and even number places of scanning electrodes. CONSTITUTION: A left scanning side driving circuit SDL1 is connected to the upper half scanning electrodes CL1 to CL239 of the odd number places of a liquid crystal display panel 1 and outputs a carry out signal to a scanning side driving circuit SDL2 when these electrodes are scanned from an upper to a lower direction. The scanning side driving circuit SDL2 are connected to the lower half scanning electrodes CL241 to CL479 of the odd number places and outputs the carry out signal to the right scanning side driving circuit SDR1 when these electrodes are scanned from the upper to the lower direction. The right scanning side driving circuit SDR1 is connected to the lower half scanning electrodes CL242 to CL480 of the even number places and outputs the carry out signal to the right scanning side driving circuit SDR2 when these electrodes are scanned from the upper to the lower direction. The right scanning side driving circuit SDR2 is connected to the upper half scanning electrodes CL2 to CL240 of the even number places and the right scanning side driving circuit SDR2 successively scans these electrodes from the lower to the upper direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal driving method,
More specifically, the present invention relates to a liquid crystal driving method for driving a simple matrix type liquid crystal display panel.

[0002]

2. Description of the Related Art In order to drive a passive matrix (simple matrix) type liquid crystal display panel, conventionally, for example, one liquid crystal display panel of 640 dots × 480 dots is used.
In the case of driving at / 480 duty, as shown in FIG. 6, 480 scanning electrodes are sequentially driven to scan from the first (uppermost) scanning electrode to the 480th (lowermost) scanning electrode. This scanning drive is always performed in the direction from the first scan electrode to the 480th scan electrode as shown by the arrow in FIG.

Further, when the liquid crystal display panel of 640 dots × 480 dots is divided into two upper and lower scanning regions by 640 dots × 240 dots and driven at 1/240 duty, as shown in FIG. From the first scan electrode in the upper scan area to the 240th scan electrode, and from the first scan electrode in the lower scan area to 240th scan electrode.
The scanning electrodes up to the th scanning electrode are always driven in the same direction at the same time, as indicated by the arrows in FIG. In any case,
In the conventional liquid crystal driving method, the scan electrodes are always scan-driven in the same direction.

[0004]

However, in such a conventional liquid crystal driving method, the scanning electrodes are always driven to scan in the same direction regardless of which driving method is used. OA (Offi
When applied to a driving method of a liquid crystal display panel of a device, a phenomenon such as flicker or flow stripes in an oblique direction is likely to occur depending on the type of graphic screen. At that time, there is a problem that flicker and oblique flow stripes are likely to occur.

That is, the flicker phenomenon is likely to occur when the frame frequency is lower than 60 Hz, but when attention is paid to a display area consisting of a small group of arbitrary adjacent pixels,
According to the conventional liquid crystal driving method in which the scanning is driven only in one direction, the image display density is high, but 1 in 1 frame.
Since the scan electrodes are sequentially scanned and driven only in the direction, the afterimage efficiency with respect to human eyes becomes low, and flicker is likely to occur depending on the frame frequency.

Regarding the flow stripe phenomenon in the oblique direction,
When the scanning drive is sequentially performed only in one direction like the conventional liquid crystal driving method, due to the response of the liquid crystal, human eyes remain as an afterimage in a state where the images are overlapped between adjacent scanning electrodes, Stripes are likely to occur.

Therefore, the present invention has been made in view of the above problems, and by making the scanning directions of the odd-numbered scan electrodes and the even-numbered scan electrodes opposite to each other, a predetermined number of scan electrodes are separated from each other. Another object of the present invention is to provide a liquid crystal driving method with good display quality by preventing the occurrence of flicker and diagonal stripes by scanning the scanning electrodes in a predetermined direction.

[0008]

According to another aspect of the present invention, there is provided a liquid crystal driving method, wherein a scan driving signal is supplied to a scan electrode of a liquid crystal display panel in which a plurality of signal electrodes and scan electrodes are formed in a matrix. In a liquid crystal driving method for driving a liquid crystal by driving a scan and supplying a display drive signal corresponding to display data to a signal electrode, an odd scan electrode and an even scan electrode among the plurality of scan electrodes The above-mentioned object is achieved by separately and sequentially driving and scanning both of them in the signal electrode direction.

In this case, for example, as described in claim 2, scanning side drive circuits are arranged on both sides of the liquid crystal display panel, and one side of the liquid crystal display panel of the scanning side drive circuits is arranged. The arranged scanning side drive circuit scans and drives the odd-numbered scan electrodes in a predetermined direction in the signal electrode direction, and the scanning side drive circuit arranged on the other side scans the even-numbered scan electrodes to the odd-numbered scan electrodes. The scanning drive may be performed in the opposite direction to the electrodes in the signal electrode direction.

Further, for example, as described in claim 3, the liquid crystal display panel is divided into a plurality of scanning regions in the scanning direction, and each scanning region is divided into a plurality of scanning regions.
The odd-numbered scan electrodes and the even-numbered scan electrodes may be sequentially scan-dried separately, and both scan directions may be scan-driven in opposite directions in the signal electrode direction.

Further, for example, as described in claim 4, the liquid crystal display panel is divided into a plurality of scanning regions in the scanning direction, and at least the regions are provided on both sides of the liquid crystal display panel. Scanning side driving circuits are arranged by the number of divided scanning areas, and an odd-numbered scanning is performed for each scanning area by the scanning side driving circuit arranged on one side of the liquid crystal display panel among the scanning side driving circuits. The electrodes are scan-driven in a predetermined direction in the signal electrode direction, and the scan-side drive circuit arranged on the other side scans the even-numbered scan electrodes in the opposite direction to the odd-numbered scan electrodes in the signal electrode direction. It may be one that does.

According to a fifth aspect of the present invention, there is provided a liquid crystal driving method, wherein a scan driving signal is supplied to a scan electrode of a liquid crystal display panel in which a plurality of signal electrodes and scan electrodes are formed in a matrix to perform scan driving, and In the liquid crystal driving method for driving the liquid crystal by supplying a display driving signal corresponding to the display data to the scanning electrodes, when the scanning electrodes are continuously scanned, at least a predetermined number of positions away from the scanning electrodes previously scanned are used. The above-mentioned object is achieved by driving the scan electrodes for scanning.

According to a sixth aspect of the present invention, there is provided a liquid crystal driving method, wherein a scan driving signal is supplied to a scan electrode of a liquid crystal display panel in which a plurality of signal electrodes and scan electrodes are formed in a matrix to perform scan driving. By supplying a display drive signal corresponding to display data to the signal electrodes, in a liquid crystal drive method for display driving, the scanning electrodes are sequentially scanned in a predetermined direction in the signal electrode direction at predetermined intervals, and
When the scanning of every predetermined number of scan electrodes is completed in the signal electrode direction, the above-mentioned object is achieved by performing the scanning of every next predetermined number of scan electrodes.

Further, in the liquid crystal driving method according to the present invention, the scan driving signal is supplied to the scan electrodes of the liquid crystal display panel in which the plurality of signal electrodes and the scan electrodes are formed in a matrix to perform scan driving, In a liquid crystal driving method for driving a display by supplying a display drive signal corresponding to display data to the signal electrodes, the scan electrodes are sequentially scanned in a predetermined direction in the signal electrode direction at predetermined intervals, and the scan electrodes When the scanning of every predetermined number of lines is completed in the signal electrode direction, the scanning of every next predetermined number of scanning electrodes is performed in the direction opposite to the scanning direction of the previous scanning electrode in the direction of the signal electrode. Has been achieved.

[0015]

According to the liquid crystal driving method of the invention described in claim 1,
Of the plurality of scan electrodes of the liquid crystal display panel, the odd-numbered scan electrodes and the even-numbered scan electrodes are sequentially driven to be scanned separately, and the odd-numbered scan electrodes and the even-numbered scan electrodes are arranged in the signal electrode direction. Since both scanning directions are driven to be opposite to each other, when attention is paid to a display area composed of a small group of arbitrary adjacent pixels, the frame frequency is doubled, the afterimage efficiency is improved, and the flicker is increased. Can be suppressed.

Further, the odd-numbered scan electrodes and the even-numbered scan electrodes are sequentially driven to scan, and the odd-numbered scan electrodes and the even-numbered scan electrodes are driven to scan in the opposite direction in the signal electrode direction. Therefore, the images of the scanning electrodes adjacent to each other can be scanned without overlapping as an afterimage due to the influence of the response of the liquid crystal, and it is possible to prevent the generation of oblique flow stripes.

In this case, for example, as described in claim 2, among the scanning side driving circuits arranged on both sides of the liquid crystal display panel, the scanning side driving circuit arranged on one side causes an odd number. Scan electrodes are driven in a predetermined direction in the signal electrode direction, and the scan side drive circuit arranged on the other side causes the even-numbered scan electrodes to move in the opposite direction to the odd-numbered scan electrodes in the signal electrode direction. When the scan driving is performed, the odd-numbered scan electrodes and the even-numbered scan electrodes can be sequentially scan-driven separately with a simple circuit configuration, and the odd-numbered scan electrodes and the even-numbered scan electrodes are reversely driven. Can be scan driven.

Further, for example, as described in claim 3, the liquid crystal display panel is divided into a plurality of scanning regions in the scanning direction, and each scanning region has an odd-numbered scanning electrode and an even-numbered scanning electrode. If the scanning electrodes and the scanning electrodes are sequentially driven separately, and both scanning directions in the signal electrode direction are driven in the opposite directions, the frame frequency can be further increased, and flicker can be further generated. Can be suppressed.

Further, for example, as described in claim 4, the liquid crystal display panel is divided into a plurality of scanning regions in the scanning direction, and the scanning regions are divided into at least two regions on both sides of the liquid crystal display panel. The number of scanning side driving circuits is arranged, and the scanning side driving circuit arranged on one side of the scanning side driving circuits drives the odd-numbered scanning electrodes in a predetermined direction in the signal electrode direction for each scanning region. Then, by the scanning side drive circuit arranged on the other side,
If the even-numbered scan electrodes are driven to scan in the direction opposite to the odd-numbered scan electrodes in the signal electrode direction, the odd-numbered scan electrodes and the even-numbered scan electrodes are scanned for each of a plurality of scanning regions with a simple circuit configuration. The electrodes can be sequentially scan-driven separately, and the odd-numbered scan electrodes and the even-numbered scan electrodes can be scan-driven in opposite directions.

According to the liquid crystal driving method of the fifth aspect of the present invention, at the time of continuously scanning the scanning electrodes of the liquid crystal display panel, at least the scanning electrodes at a position apart from the previously scanned scanning electrodes by a predetermined number are driven to scan. Therefore, when focusing on the display area consisting of a small group of adjacent pixels,
The frame frequency can be increased, the afterimage efficiency can be improved, and the occurrence of flicker can be suppressed.

Further, the images of the scanning electrodes adjacent to each other can be scanned by the influence of the response of the liquid crystal without overlapping as an afterimage, and it is possible to prevent the generation of oblique flow stripes.

According to the liquid crystal driving method of the sixth aspect of the invention, the scanning electrodes are sequentially scanned in a predetermined direction in the signal electrode direction at predetermined intervals, and the scanning electrodes are scanned every predetermined number of signal electrodes. When all are completed in the direction, scanning is performed every predetermined number of next scanning electrodes, so that the frame frequency can be increased by a predetermined number of times when attention is paid to the display area including a small group of adjacent pixels. The afterimage efficiency is improved, and the occurrence of flicker can be further suppressed.

Further, it is possible to perform scanning while further preventing the images of the adjacent scanning electrodes from being overlapped as an afterimage due to the influence of the response of the liquid crystal, and further to prevent the generation of diagonal flow stripes. You can

Further, according to the liquid crystal driving method of the present invention, the scanning electrodes are sequentially scanned in the predetermined direction in the signal electrode direction at predetermined intervals, and the scanning electrodes are scanned every predetermined number of signal electrodes. When all of the scanning electrodes are completed in the same direction, scanning is performed every predetermined number of the next scanning electrodes in the direction opposite to the scanning direction in the signal electrode direction of the previous scanning electrodes, so that the scanning electrodes are composed of a small group of adjacent pixels. When paying attention to the display area, the frame frequency can be increased by a predetermined number of times or more, the afterimage efficiency can be further improved, and the occurrence of flicker can be further suppressed.

Further, it is possible to perform scanning while further preventing the images of the adjacent scanning electrodes from being overlapped as an afterimage due to the influence of the response of the liquid crystal, and to further prevent the generation of oblique flow stripes. You can

[0026]

EXAMPLES The present invention will be specifically described below based on examples. 1 to 3 are views showing an embodiment of the liquid crystal driving method of the present invention. In this embodiment, 640 dots × 480
This is applied to a liquid crystal display panel of dots which is driven to display at 1/480 duty. FIG. 1 is a circuit block diagram of a liquid crystal display panel 1 to which the liquid crystal driving method of the present embodiment is applied, its scanning side driving circuits SDR1, SDR2, SDL1, SDL2, and signal side driving circuits CD1 to CDn.

The liquid crystal display panel 1 is a simple matrix type liquid crystal display panel, in which 640 signal electrodes (not shown) are arranged in the vertical direction and scanning electrodes CL1 to CL480 are arranged in the horizontal direction.
Eighty pixels are formed to have a pixel configuration of 640 dots × 480 dots. 1, odd-numbered scan electrodes CL1, CL3, ..., CL479 are indicated by solid lines, and even-numbered scan electrodes CL2, CL4 ,.
480 is indicated by a broken line.

Scanning side driving circuits SDL1 and SDL2 are arranged on the left side of the liquid crystal display panel 1, and scanning side driving circuits SDR1 and SDR2 are arranged on the right side of the liquid crystal display panel 1.

The scanning side drive circuit SDL1 on the left side is
The output terminals from No. 1 to No. 120 are odd-numbered scan electrodes CL1 from the first to 239th of the liquid crystal display panel 1,
The scanning-side drive circuit SDL2 is connected to CL3, ..., CL239, and the scanning-side drive circuit SDL2 has odd-numbered scan electrodes CL241, CL243 ,. , CL479.

The scanning side drive circuit SDR1 on the right side is
The output terminals from 1 to 120 are the 24th of the liquid crystal display panel 1.
Second to 480th even-numbered scan electrodes CL
242, CL246, ..., CL480, and the scanning-side drive circuit SDR2 has even-numbered scan electrodes CL2, CL4, ... .., connected to CL240.

The left scan side drive circuit SDL1 outputs the scan drive signal to the first scan electrode CL1 for sequentially outputting the scan drive signals to the scan electrodes CL1, CL3, ... The first line marker (FLM) signal, which is the trigger signal input to the input terminal, is input, and its carry-out terminal C / O is connected to the input terminal E of the scanning side drive circuit SDL2. The carry-out terminal C / O of the scan side drive circuit SDL2 is connected to the input terminal E of the right scan side drive circuit SDR1, and the carry out terminal C / O of the scan side drive circuit SDR1.
O is connected to the input terminal E of the scan side drive circuit SDR2.

When the FLM signal is input to the input terminal E of the scan side drive circuit SDL1 on the left side, the scan electrode CL1 is connected to the scan electrodes CL1, CL3, ...
From the scan electrode CL239 to the scan electrode CL239, that is, when the scan drive signal is sequentially output from the top to the bottom as shown by the solid line arrow in FIG. The carry-out signal is output from the C / O to the input terminal E of the scan-side drive circuit SDL2, and when the carry-out signal is input, the scan-side drive circuit SDL2 similarly connects the scan electrode CL2 to which it is connected.
41, CL243, ..., From the scan electrode CL241 to the scan electrode CL479, that is, as shown by the solid line arrow in FIG. 1, sequentially outputs the scan drive signal from the top to the bottom to output the last scan electrode CL479. When a scan drive signal is output to the scan-out drive circuit SDR1, the carry-out signal is output from the carry-out terminal C / O.

When the carry-out signal is input from the scanning-side driving circuit SDL2, the scanning-side driving circuit SDR1 is connected to the scanning electrodes CL242, CL244, ...
In the order from scan electrode CL480 to scan electrode CL242,
That is, as indicated by the broken line arrow in FIG. 1, the scan driving signals are sequentially output from the bottom to the top to output the last scan electrode CL.
When the scanning drive signal is output to 242, the carry-out signal is output from the carry-out terminal C / O to the scanning-side drive circuit SD.
When the carry-out signal is input from the scan drive signal 1, the scan side drive circuit SDR2 outputs to the R2, and the scan side drive circuit SDR2 connects the scan electrodes C2, CL4, ...
Scanning drive signals are sequentially output from L240 to the scanning electrode CL2, that is, from bottom to top, as indicated by the dashed arrow in FIG.

The output terminals of the signal side drive circuits CD1 to CDn are sequentially connected to a plurality of signal electrodes formed on the liquid crystal display panel 1 from the left end, and display data input from a control circuit (not shown) is supplied to each of them. Sampling is performed at a timing corresponding to the signal electrode and output as a display drive signal to each signal electrode.

In this case, the signal side drive circuits CD1 to CD
Display data corresponding to the scan electrodes CL1 to CL480 scanned by the scan side drive circuits SDL1 and SD2 and the scan side drive circuits SDR1 and SDR2 are input to the n from a control circuit (not shown), and each signal side drive circuit CD1. ~ CDn
Sample this display data and output it to each signal electrode as a display drive signal.

The control circuit includes, for example, a memory for storing display data for one frame, and after temporarily storing the display data for one frame in this memory, the scan side drive circuits SDL1 and SD2 and the scan side drive circuit. SDR1, SD
The display data corresponding to the scan electrodes CL1 to CL480 scanned by R2 are sequentially read out, and the signal side drive circuit C
Output to D1 to CDn.

When the display drive signal is supplied from the signal side drive circuits CD1 to CDn to the respective signal electrodes, at that time, the scan side drive circuits SDL1 and SD2 and the scan side drive circuit SDR.
1, scan electrodes CL1 to C scanned by SDR2
The pixel formed at the intersection of L480 and the signal electrode is driven for display.

Next, the operation of this embodiment will be described. Scanning side drive circuits SDL1 and SDL2 on the left side of the liquid crystal display panel 1
Is an odd-numbered scan electrode CL1, CL3, ..., CL
479 connected to the scanning side drive circuits SDR1 and SDR on the right side
DR2 is an even-numbered scan electrode CL2, CL4, ...
., Connected to CL480.

When the FLM signal is input to the scanning side drive circuit SDL1, the scanning electrodes CL1, CL3, ..., CL2 are synchronized with the common shift clock as shown in FIG.
39 sequentially outputs a scan drive signal to the odd-numbered scan electrodes CL1 to CL239 sequentially from the first scan electrode CL1 to the 239th scan electrode CL239, and as shown by a solid arrow in FIG. Scanning is driven from the top to the bottom of the display panel 1.

When the scan side drive circuit SDL1 scans to the 239th scan electrode CL239, the scan side drive circuit SDL outputs a carry out signal from the carry out terminal C / O.
When the carry-out signal is input to the scan side drive circuit SDL2, the scan-side drive circuit SDL2 similarly outputs the scan electrode CL24 in synchronization with the common shift clock as shown in FIG.
1, CL243, ..., CL479 are sequentially output the scanning drive signals to the odd-numbered scan electrodes CL241 to CL4.
79 from the 241st scan electrode CL241 to the 479th scan electrode CL241.
Scanning drive is sequentially performed from the top to the bottom of the liquid crystal display panel 1 up to the th scan electrode CL479 as shown by the solid line arrow in FIG. When the scan side drive circuit SDL2 scans up to the 479th scan electrode CL479, the scan driving of the odd scan electrodes CL1 to CL479 is completed.

The scanning side drive circuit SDL2 has a fourth lowermost end.
When the 79th scan electrode CL479 is scan-driven, a carry-out signal is output from the carry-out terminal C / O to the scan-side drive circuit SDR1, and the scan-side drive circuit SDR1.
When the carry-out signal is input, the scan electrode CL4 is synchronized with the common shift clock as shown in FIG.
80, CL 478, ..., CL 242 by sequentially outputting scanning drive signals to scan even-numbered scan electrodes CL 480 to CL 2
42 from the 480th scan electrode CL480 to the 242nd scan electrode CL480.
Up to the second scan electrode CL242, as shown by the broken line arrow in FIG. 3, scanning drive is performed from the bottom to the top of the liquid crystal display panel 1 in the direction opposite to the odd scan direction in the signal electrode direction.

When the scan side drive circuit SDL1 scans to the 242nd scan electrode CL242, the scan side drive circuit SDL outputs a carry out signal from the carry out terminal C / O.
When the carry-out signal is input to the scan side drive circuit SDR2, the scan electrodes CL240 and CL2 are output in synchronization with the common shift clock, as shown in FIG.
38, ..., By outputting a sequential scanning drive signal to CL2,
The even-numbered scan electrodes CL240 to CL2 are changed from the 240th scan electrode CL240 to the second scan electrode CL2.
Up to this point, as shown by the broken line arrow in FIG. 3, the liquid crystal display panel 1 is scan-driven in the direction opposite to the odd-numbered scanning direction in the signal electrode direction.

When the scan side drive circuit SDR2 scans up to the second scan electrode CL2, the even scan electrode CL4
The scan drive of 80 to CL2 is completed. Then, as described above, the scan electrodes CL1 to CL480 of the liquid crystal display panel 1 are odd-numbered scan electrodes CL1, CL3, ..., CL479.
And even-numbered scan electrodes CL2, CL4, ..., CL4
., CL479 and odd-numbered scan electrodes CL1, CL3, ..., CL479 and even-numbered scan electrodes CL2, CL4 ,. In contrast to being driven, as shown in FIG.
Display data corresponding to CL480 is input to the signal side drive circuits CD1 to CDn from a control circuit (not shown), and the signal side drive circuit outputs a display drive signal to the signal electrode based on this display data.

Therefore, in the liquid crystal display panel 1, the odd-numbered scan electrodes CL1, CL3, ..., CL479 and the even-numbered scan electrodes CL2, CL4 ,.
, And display driving is performed separately, and display driving is performed in the opposite direction in the signal electrode direction by the odd-numbered scan electrodes CL1, CL3, ..., CL479 and the even-numbered scan electrodes CL2, CL4 ,. To be done.

As a result, odd-numbered scan electrodes CL1, C
L3, ..., CL479 and even-numbered scan electrodes CL
2, CL4, ..., CL480 as a pair,
Since the scanning is performed twice in one frame, the afterimage efficiency for human eyes can be improved and flicker can be prevented.

Further, the liquid crystal display panel 1 is divided into the odd-numbered scan electrodes CL1, CL3, ..., CL479 and the even-numbered scan electrodes CL2, CL4 ,. Odd scan electrodes CL
, CL479 and the even-numbered scan electrodes CL2, CL4, ..., CL480 are driven in the opposite direction in the signal electrode direction, and therefore, due to the influence of the liquid crystal response of the liquid crystal display panel 1. It is possible to prevent the occurrence of an afterimage due to the overlapping of images between the scanning electrodes CL1 to CL480 adjacent to each other, and it is possible to prevent the generation of diagonal stripes.

As described above, according to this embodiment, of the plurality of scan electrodes CL1 to CL480 of the liquid crystal display panel 1,
Odd scan electrodes CL1, CL3, ..., CL47
9 and even-numbered scan electrodes CL2, CL4, ..., CL
, 480 are sequentially driven separately, and odd-numbered scan electrodes CL1, CL3, ..., CL479 and even-numbered scan electrodes CL2, CL4 ,.
Since and are driven to scan in the opposite direction, when attention is paid to a display area consisting of a small group of arbitrary adjacent pixels, the frame frequency is doubled, the afterimage efficiency is improved, and the occurrence of flicker is suppressed. can do.

In addition, odd-numbered scan electrodes CL1 and CL
3, ..., CL479 and even-numbered scan electrodes CL2,
CL4, ..., CL480 are sequentially driven to scan separately, and odd-numbered scan electrodes CL1, CL3 ,.
.... CL479 and even-numbered scan electrodes CL2 and CL
, ..., CL480 are driven to scan in the opposite direction, so that the images of the adjacent scan electrodes CL1 to CL480 can be scanned without overlapping as an afterimage due to the influence of the response of the liquid crystal, and can be scanned obliquely. It is possible to prevent the occurrence of flow stripes in the direction.

Further, in the present embodiment, the scanning side drive circuits SDL arranged on both sides of the liquid crystal display panel 1 are provided.
Of the 1, SDL2, SDR1 and SDR2, the scan side drive circuits SDL1 and SDL2 arranged on the left side scan-drive the odd-numbered scan electrodes CL1, CL3, ... The scanning side drive circuits SDR1 and SDR2 thus arranged drive the even-numbered scan electrodes CL2, CL4, ..., CL480 in the opposite direction to the odd-numbered scan electrodes CL1, CL3 ,. Therefore, the odd-numbered scan electrodes CL1, CL3, ..., CL479 and the even-numbered scan electrodes CL2, CL4, ..., CL480 can be sequentially and separately driven with a simple circuit configuration. Together with the odd-numbered scan electrodes CL1, CL3, ..., CL479
And even-numbered scan electrodes CL2, CL4, ..., CL4
80 can be easily scan-driven in the opposite direction.

4 and 5 are views showing another embodiment of the liquid crystal driving method of the present invention. In this embodiment, the scanning area of the liquid crystal display panel is divided into two in the signal electrode direction.

In the description of this embodiment, the same components as those in the above embodiment will be designated by the same reference numerals and the description thereof will be omitted. The liquid crystal display panel 10 has 640 signal electrodes and 480 scanning electrodes C as in the above-described embodiment.
L1 to CL480 are formed in a matrix and have a pixel configuration of dots × 480 dots. As will be described later, scanning side drive circuits SDL1, SDL2, SDR1,
On the wiring of the SDR2, with the position shown by the alternate long and short dash line in FIGS. 4 and 5 as the boundary, that is, with the scan electrode CL240 and the scan electrode CL241 as the boundary, the upper scan area AU and the lower scan area A
It is divided into two scan areas L and 2.

Scanning side driving circuits SDL1 and SDL2 and scanning side driving circuits SDR1 and SDR2 for the upper scanning area AU and the lower scanning area AL are arranged on the left side and the right side of the liquid crystal display panel 10 with the liquid crystal display panel 10 interposed therebetween. The scanning side drive circuits SDL1 and SDL2 on the left side are provided with the FLM signal at their input terminals E.

The carry-out terminal C / O of the scan side drive circuit SDL1 for the upper scan area AU on the left side is connected to the input terminal E of the scan side drive circuit SDR2 for the upper scan area AU on the right side. The carry-out terminal C / O of the scan side drive circuit SDL2 for the lower scan area AL is connected to the input terminal E of the scan side drive circuit SDR1 for the lower scan area AL on the right side.

The output terminal of the scan side drive circuit SDL1 has an odd number of scan electrodes CL in the upper scan area AU.
1, CL3, ..., CL239, and the output terminal of the scanning side drive circuit SDL2 is in the lower scanning area A.
L odd scan electrodes CL241, CL243, ...
., Connected to CL479.

The output terminal of the scan side drive circuit SDR1 has an even number of scan electrodes CL24 in the lower scan area AL.
2, CL244, ..., CL480, and the output terminal of the scanning side drive circuit SDR2 is an even-numbered scan electrode CL2, CL4, ... In the upper scan area AU.
., Connected to CL240.

Therefore, when the FLM signal is input to the scanning side drive circuit SDL1 for the left upper scanning area AU,
Odd-numbered scan electrodes CL1, CL3 of the upper scan area AU,
..., CL239 to scan electrode CL1 to scan electrode C
In the order of L239, that is, in the order from the upper side to the lower side of the upper scanning area AU, the scanning drive signal is sequentially output to perform scanning driving, and when the scanning electrode CL239 is scanned, the carry-out terminal C
A carry-out signal is output from / O to the scanning side drive circuit SDR2 for the right upper scanning area AU.

When the carry-out signal is input, the scan side drive circuit SDR2 causes the scan electrode CL240 to the scan electrode CL2 in that order on the even-numbered scan electrodes CL2, CL4, ..., CL480 of the upper scan area AU. That is, the scanning drive signals are sequentially output from the bottom of the upper scanning area AU in the upward direction to drive the scanning.

Therefore, in the upper scanning area AU, the odd-numbered scanning electrodes CL are formed by the scanning side drive circuit SDL1.
1, CL3, ..., CL239 are sequentially scan-driven from the top to the bottom, and then the scan-side drive circuit SDR2 causes the even-numbered scan electrodes CL2, CL4 ,.
The CL 240 is sequentially scan driven from the bottom to the top.

The scanning side drive circuit SDL2 for the lower scanning area AL on the left side receives the FLM signal and receives odd-numbered scanning electrodes CL241, CL24 of the lower scanning area AL.
, ..., CL479 in order from the scan electrode CL241 to the scan electrode CL479, that is, in order from the top to the bottom of the lower scan area AL, sequentially outputs a scan drive signal to perform scan drive, and scans to the scan electrode CL479. , Carry-out signal is output from the carry-out terminal C / O to the scanning side drive circuit SDR1 for the right lower scanning area AL.

When the carry-out signal is input, the scan side drive circuit SDR1 receives even-numbered scan electrodes CL242, CL244, ..., CL480 in the lower scan area AL.
In the order from scan electrode CL480 to scan electrode CL242,
That is, the scanning drive signals are sequentially output from the bottom to the top of the lower scanning area AL to perform scanning driving.

Therefore, in the lower scan area AL, the odd-numbered scan electrodes CL2 are driven by the scan side drive circuit SDL2.
, CL243, ..., CL479 are sequentially scan-driven from the top to the bottom, and then the scan-side drive circuit SDR.
1, the even-numbered scan electrodes CL242, CL2
.., CL480 are sequentially scan driven from the bottom to the top.

On the upper side of the liquid crystal display panel 10,
Signal side driving circuits CDU1 to CDUn connected to the respective signal electrodes of the upper scanning area AU are provided, and signal side driving circuits connected to the respective signal electrodes of the lower scanning area AL are provided below the liquid crystal display panel. The circuits CDL1 to CDLn are arranged.

The signal side drive circuits CDU1 to CDUn are each of the scan electrodes CL scan-driven by the scan side drive circuit SDL1 and the scan side drive circuit SDR2 for the upper scan area AU.
1 to CL240, the display drive signals corresponding to the display data corresponding to the scan timings of 1 to CL240 are output to the respective signal electrodes, and the signal side drive circuits CDL1 to CDLn include the scan side drive circuit SDL2 and the scan side drive circuit for the lower scan area AL. A display drive signal corresponding to the display data corresponding to the scan timing of the scan electrodes CL241 to CL480 that is scan-driven by the SDR1 is output to each signal electrode.

Therefore, in this embodiment, the FLM
The signals are the scanning side driving circuit SDL1 and the scanning side driving circuit SDL.
By being simultaneously input to 2, the scan side drive circuit SDL1 for the upper scan area AU and the scan side drive circuit SDL2 for the lower scan area AL simultaneously start scanning.

The scanning side drive circuit SDL1 has an upper scanning area A
The odd-numbered scan electrodes CL1 to CL239 of U are sequentially driven to scan downward from the scan electrode CL1, and the scan electrode CL2
When scanning is performed up to 39, a carry-out signal is output to the scan side drive circuit SDR2, and the scan side drive circuit SDL2 simultaneously scans the odd-numbered scan electrodes CL241 to CL479 of the lower scan area AL with the scan electrode CL.
The scanning electrode CL4 is sequentially driven to scan downward from 241.
When scanning is performed up to 79, a carry-out signal is output to the scanning side drive circuit SDR1.

When the carry-out signal is input, the scan side drive circuit SDR1 sequentially scans and drives the even-numbered scan electrodes CL242 to CL480 of the lower scan area AL upward from the scan electrode CL480, and the scan side drive circuit SDR2.
When the carry-out signal is input at the same time as the scan-side drive circuit SDR1, the scan electrodes C2, CL4, ..., CL240 of the even-numbered scan electrodes in the upper scan area AU are scanned.
The scanning is sequentially driven upward from L240.

Then, the signal side drive circuits CDU1 to CDUn and the signal side drive circuit CDL1 are synchronized with the scanning drive of the upper scan area AU and the lower scan area AL.
Display drive signal is supplied from CDLn to upper scan area A
U and the lower scan area AL are odd-numbered scan electrodes CL, respectively
1, CL3, ..., CL239 and scan electrode CL24
, CL243, ..., CL479 are simultaneously driven for scanning, and thereafter, even-numbered scan electrodes CL2, CL4 ,.
.... CL240 and scan electrodes CL242, CL244,
.., CL480 are simultaneously driven for scanning, and the upper scanning area AU and the lower scanning area AL are simultaneously driven for display.

Therefore, the liquid crystal display panel 10 can be driven for display at a period twice that of the above-described embodiment, and the odd-numbered scan electrodes CL1, CL3, ..., CL are provided.
479 and even-numbered scan electrodes CL2, CL4, ...
It is possible to drive the CL 480 while scanning and driving the CL 480 in the opposite direction with respect to the signal electrode direction, more effectively prevent the occurrence of flicker, and prevent the occurrence of diagonal flow stripes. it can.

As described above, in this embodiment, the liquid crystal display panel 10 has two scanning areas A in the scanning direction.
It is divided into U and AL, and each scan area is AU and AL.
The odd-numbered scan electrodes CL1, CL3, ...
CL239, scan electrodes CL241, CL243, ...
.., CL479 and even-numbered scan electrodes CL2, CL4,
..., CL240, scan electrodes CL242, CL24
, ..., CL480 are sequentially and separately scan driven, and both scan directions are scan driven in opposite directions in the signal electrode direction, so that the frame frequency can be further increased, and It is possible to further suppress the occurrence of flicker.

Further, in this embodiment, the scanning side drive circuits SDL1 and SDR2 for the upper scanning area AU and the scanning side drive circuits SDL2 and SDR1 for the lower scanning area AL are arranged on both sides of the liquid crystal display panel 10. , The scan side drive circuits SDL1 and SDL2 arranged on the left side scan and drive the odd-numbered scan electrodes CL1, CL3, ..., CL479 from the top to the bottom, and the scan side drive circuit SDR1 arranged on the right side. SDR2 allows even-numbered scan electrodes CL
, CL480 are driven to scan from the bottom to the top in the direction opposite to the signal electrodes in the direction of the signal electrodes of the odd-numbered scan electrodes CL1, CL3 ,. Then, for each scan area AU, AL,
Odd scan electrodes CL1, CL3, ..., CL47
9 and even-numbered scan electrodes CL2, CL4, ..., CL
480 can be sequentially driven separately, and odd-numbered scan electrodes CL1, CL3, ..., C
L479 and even-numbered scan electrodes CL2, CL4, ...
The CL480 and the CL480 can be scan-driven in directions opposite to each other.

Although the present invention has been specifically described based on the preferred embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say.

For example, in each of the above embodiments, the liquid crystal display panels 1 and 10 are connected to the odd-numbered scan electrodes CL1 and CL.
3, ..., CL479 and even-numbered scan electrodes CL2,
Although CL4, ..., CL480 are separately scanned and both scanning directions are opposite to each other, the scanning is not limited to this. For example, scanning electrodes of the liquid crystal display panel are continuously scanned. At this time, at least the scan electrodes at a position distant from the previously-scanned scan electrodes by a predetermined number may be scan-driven, and in this way, when attention is paid to a display region formed of a small group of arbitrary adjacent pixels, The frame frequency can be increased, the afterimage efficiency can be improved, and the occurrence of flicker can be suppressed. Also,
Images of adjacent scan electrodes can be scanned without overlapping as an afterimage due to the influence of the response of liquid crystal.
It is possible to prevent the generation of diagonal flow stripes.

Further, for example, when the scanning electrodes are sequentially scanned in a predetermined direction in the signal electrode direction at predetermined intervals, and when the scanning of the scanning electrodes by the predetermined number is all completed in the signal electrode direction, the next scanning electrode is predetermined. Scanning may be performed every number of lines, which makes it possible to increase the frame frequency by a predetermined number of times and improve the afterimage efficiency when focusing on a display area made up of a small group of arbitrary adjacent pixels. Thus, the occurrence of flicker can be further suppressed. Further, the images of the scanning electrodes adjacent to each other can be scanned while being further influenced by the response of the liquid crystal as an afterimage to prevent the overlapping, and the flow fringes in the oblique direction can be further prevented from occurring.

Further, the scanning electrodes are sequentially scanned in the predetermined direction in the signal electrode direction at predetermined intervals, and when the scanning of the scanning electrodes in the predetermined number is completed in the signal electrode direction, the next scanning electrodes are scanned in the predetermined number. The scanning of may be performed in the opposite direction to the scanning direction in the signal electrode direction of the previous scanning electrode. In this case,
When attention is paid to a display area made up of a small group of arbitrary adjacent pixels, the frame frequency can be increased by a predetermined time or more, the afterimage efficiency is further improved, and the occurrence of flicker can be further suppressed. Further, the images of the adjacent scanning electrodes can be scanned while being further influenced by the response of the liquid crystal as an afterimage to prevent overlapping and further prevent the generation of oblique flow stripes.

[0075]

According to the liquid crystal driving method of the first aspect of the invention, the odd-numbered scan electrodes and the even-numbered scan electrodes of the plurality of scan electrodes of the liquid crystal display panel are sequentially and separately driven. At the same time, since the odd-numbered scan electrodes and the even-numbered scan electrodes are scan-driven in the directions opposite to each other in the signal electrode direction, attention is paid to a display area formed of a small group of adjacent pixels. In this case, the frame frequency is doubled, the afterimage efficiency is improved, and the occurrence of flicker can be suppressed.

Further, the odd-numbered scan electrodes and the even-numbered scan electrodes are sequentially driven to scan, and the odd-numbered scan electrodes and the even-numbered scan electrodes are driven to scan in the opposite directions in the signal electrode direction. Therefore, the images of the scanning electrodes adjacent to each other can be scanned without overlapping as an afterimage due to the influence of the response of the liquid crystal, and it is possible to prevent the generation of oblique flow stripes.

In this case, as described in claim 2, among the scanning side driving circuits arranged on both sides of the liquid crystal display panel, the scanning side driving circuit arranged on one side scans the odd-numbered scanning lines. The electrodes are scan-driven in a predetermined direction in the signal electrode direction, and the scanning-side drive circuit arranged on the other side causes the even-numbered scan electrodes to be opposite to the odd-numbered scan electrodes in the signal electrode direction. When the scan drive is performed in the direction, the odd-numbered scan electrodes and the even-numbered scan electrodes can be sequentially scan-driven separately with a simple circuit configuration, and the odd-numbered scan electrodes and the even-numbered scan electrodes can be driven. The scanning can be driven in the reverse direction.

In addition, as described in claim 3, the liquid crystal display panel is divided into a plurality of scanning regions in the scanning direction, and the odd-numbered scan electrodes and the even-numbered scan electrodes are provided for each of the scanning regions. When the scanning signals are sequentially driven separately and the scanning signals are driven in the opposite direction in the signal electrode direction, the frame frequency can be further increased and the occurrence of flicker can be further suppressed.

Further, as described in claim 4, the liquid crystal display panel is divided into a plurality of scanning regions in the scanning direction, and the number of the scanning regions is divided into at least two regions on both sides of the liquid crystal display panel. Only the scanning side driving circuit is arranged, and among the scanning side driving circuits,
The scan-side drive circuit arranged on one side scans and drives the odd-numbered scan electrodes in a predetermined direction in the signal electrode direction, and the scan-side drive circuit arranged on the other side scans the even-numbered scan electrodes to the odd-numbered scan electrodes. If the scanning drive is performed in the direction opposite to the scanning electrodes in the signal electrode direction, the odd-numbered scanning electrodes and the even-numbered scanning electrodes are sequentially driven separately for each of a plurality of scanning regions with a simple circuit configuration. In addition, it is possible to drive the odd-numbered scan electrodes and the even-numbered scan electrodes in opposite directions.

According to the liquid crystal driving method of the fifth aspect of the present invention, at the time of continuously scanning the scan electrodes of the liquid crystal display panel, at least the scan electrodes at a position separated from the previously scanned scan electrode by a predetermined number are scanned and driven. Therefore, when focusing on the display area consisting of a small group of adjacent pixels,
The frame frequency can be increased, the afterimage efficiency can be improved, and the occurrence of flicker can be suppressed.

Further, the images of the scanning electrodes adjacent to each other can be scanned without overlapping as an afterimage due to the influence of the response of the liquid crystal, and it is possible to prevent the generation of oblique flow stripes.

According to the liquid crystal driving method of the present invention, the scanning electrodes are sequentially scanned in a predetermined direction in the signal electrode direction at predetermined intervals, and the scanning electrodes are scanned every predetermined number of signal electrodes. When all are completed in the direction, scanning is performed every predetermined number of next scanning electrodes, so that the frame frequency can be increased by a predetermined number of times when attention is paid to the display area including a small group of adjacent pixels. The afterimage efficiency is improved, and the occurrence of flicker can be further suppressed.

Further, it is possible to perform scanning while further preventing the images of the adjacent scanning electrodes from being overlapped as an afterimage due to the influence of the response of the liquid crystal, and further to prevent the generation of diagonal flow stripes. You can

Further, according to the liquid crystal driving method of the present invention, the scanning electrodes are sequentially scanned in a predetermined direction in the signal electrode direction at predetermined intervals, and the scanning electrodes are scanned every predetermined number of signal electrodes. When all of the scanning electrodes are completed in the same direction, scanning is performed every predetermined number of the next scanning electrodes in the direction opposite to the scanning direction in the signal electrode direction of the previous scanning electrodes, so that the scanning electrodes are composed of a small group of adjacent pixels. When paying attention to the display area, the frame frequency can be increased by a predetermined number of times or more, the afterimage efficiency can be further improved, and the occurrence of flicker can be further suppressed.

Further, it is possible to perform scanning while further preventing the images of the adjacent scanning electrodes from being overlapped as an afterimage due to the influence of the response of the liquid crystal, and to further prevent the generation of diagonal flow stripes. You can

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a liquid crystal display panel and a driving circuit to which an embodiment of a liquid crystal driving method of the present invention is applied.

FIG. 2 is a timing diagram of a common shift clock, an FLM signal, a scan drive signal supplied to each scan electrode, and display data according to an embodiment of a liquid crystal drive method of the present invention.

FIG. 3 is an operation explanatory view according to an embodiment of a liquid crystal driving method of the present invention.

FIG. 4 is a circuit block diagram of a liquid crystal display panel and a driving circuit to which another embodiment of the liquid crystal driving method of the present invention is applied.

FIG. 5 is an explanatory view of the operation of the liquid crystal driving method of FIG.

FIG. 6 is an explanatory diagram of a conventional liquid crystal driving method in the case of sequentially driving all scan electrodes of a liquid crystal display panel.

FIG. 7 is an explanatory diagram of a conventional liquid crystal driving method in the case where the scanning electrodes in each scanning region of the liquid crystal display panel divided into two are sequentially driven separately.

[Explanation of symbols]

1, 10 Liquid crystal display panel SDL1, SDL2, SDR1, SDR2 Scan side drive circuit CD1 to CDn, CDU1 to CDUn, CDL1 to CD
Ln signal side drive circuit CL1 to CL480 scanning electrode AU upper scanning area AL lower scanning area E input terminal C / O carry-out terminal

Claims (7)

[Claims] 1. A scan driving signal is supplied to a scan electrode of a liquid crystal display panel in which a plurality of signal electrodes and scan electrodes are formed in a matrix to drive scan, and a display drive signal corresponding to display data is supplied to the signal electrode. In the liquid crystal driving method for driving the liquid crystal by supplying the liquid crystal, in the plurality of scan electrodes, the odd-numbered scan electrodes and the even-numbered scan electrodes are sequentially and separately driven to scan, and in the signal electrode direction. A liquid crystal driving method, characterized in that both scanning directions are scan-driven in opposite directions. 2. A scanning side driving circuit is arranged on both sides of the liquid crystal display panel, and the scanning side driving circuit arranged on one side of the liquid crystal display panel among the scanning side driving circuits makes odd-numbered driving circuits. The scan electrodes are scan-driven in a predetermined direction in the signal electrode direction, and the scan side drive circuit arranged on the other side scans the even-numbered scan electrodes in the opposite direction to the odd-numbered scan electrodes in the signal electrode direction. The liquid crystal driving method according to claim 1, wherein the liquid crystal driving method is performed. 3. The liquid crystal display panel is divided into a plurality of scanning regions in the scanning direction, and the odd-numbered scan electrodes and the even-numbered scan electrodes are sequentially arranged in each scanning region. 2. The liquid crystal driving method according to claim 1, wherein the scan driving is performed separately and both scan directions are opposite to each other in the signal electrode direction. 4. The liquid crystal display panel is divided into a plurality of scanning areas in the scanning direction, and the scanning side drive is performed by at least the number of the divided scanning areas on both sides of the liquid crystal display panel. A circuit is arranged, and for each of the scanning regions, a scanning side driving circuit arranged on one side of the liquid crystal display panel among the scanning side driving circuits scans odd-numbered scanning electrodes in a predetermined direction in the signal electrode direction. 2. The driving circuit according to claim 1, wherein the scanning-side driving circuit is driven to scan the even-numbered scan electrodes in a direction opposite to the odd-numbered scan electrodes in the signal electrode direction. LCD driving method. 5. A scan driving signal is supplied to the scan electrodes of a liquid crystal display panel in which a plurality of signal electrodes and scan electrodes are formed in a matrix to perform scan driving, and display drive signals corresponding to display data are supplied to the signal electrodes. In the liquid crystal driving method for driving the liquid crystal by supplying the liquid crystal, at the time of continuously scanning the scanning electrodes, at least the scanning electrodes at a position apart from the previously scanned scanning electrodes by a predetermined number are scanned and driven. LCD driving method. 6. A scan drive signal is supplied to the scan electrodes of a liquid crystal display panel in which a plurality of signal electrodes and scan electrodes are formed in a matrix to drive scan, and a display drive signal corresponding to display data is supplied to the signal electrodes. In the liquid crystal driving method of driving the display by supplying the scanning electrodes, the scanning electrodes are sequentially scanned in a predetermined direction in the signal electrode direction at a predetermined number of times, and the scanning electrodes are scanned at a predetermined number every all in the signal electrode direction. When completed, the liquid crystal driving method is characterized in that scanning is performed every predetermined number of next scanning electrodes. 7. A scan driving signal is supplied to a scan electrode of a liquid crystal display panel in which a plurality of signal electrodes and a scan electrode are formed in a matrix to perform scan driving, and a display drive signal corresponding to display data is supplied to the signal electrode. In the liquid crystal driving method of driving the display by supplying the scanning electrodes, the scanning electrodes are sequentially scanned in a predetermined direction in the signal electrode direction at a predetermined number of times, and the scanning electrodes are scanned at a predetermined number every all in the signal electrode direction. When completed, the liquid crystal driving method is characterized in that the scanning of a predetermined number of next scanning electrodes is performed in a direction opposite to the scanning direction of the previous scanning electrodes in the signal electrode direction.