CN102081909B - Overvoltage drive method and device of liquid crystal display - Google Patents
Overvoltage drive method and device of liquid crystal display Download PDFInfo
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- CN102081909B CN102081909B CN 200910188518 CN200910188518A CN102081909B CN 102081909 B CN102081909 B CN 102081909B CN 200910188518 CN200910188518 CN 200910188518 CN 200910188518 A CN200910188518 A CN 200910188518A CN 102081909 B CN102081909 B CN 102081909B
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- drawing frame
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Abstract
The invention provides an overvoltage drive method and device of a liquid crystal display for compensating the gray scale brightness value of the liquid crystal display. The overvoltage drive method comprises the following steps: the current picture frame data is output by a data buffer unit and then is stored to a picture frame memory unit, and the former picture frame data is output; through the current picture frame data and the former picture frame data, inquire is carried out aiming at a plurality of parameter tables and corresponding to a driving voltage value in one of parameter tables; the current picture frame data is received through a position scanning unit so as to judge the current position; and finally, the corresponding driving voltage value on the current position is output through a multiplexer. Thus the grey scale light values on the upper, middle and lower parts of a display panel are consistent, so as to avoid the generation of ghost phenomenon.
Description
Technical field
The present invention is about a kind of driving method of liquid crystal display and device, refers to especially a kind ofly judge that different display positions are tabled look-up with different overvoltages and drive driving method and the device of liquid crystal display.
Background technology
The mode that the solid of display equipment is inspected is left eye and the right eye demonstration different content the mankind; Particularly, this kind solid is inspected and need to be presented different images to the mankind's left eye and right eye.Inspect type in a kind of special solid, namely in the three-dimensional inspection method of seasonal effect in time series, the image of left eye and right eye is presented in the mode that replaces.
For guaranteeing that complete solid inspects, the alternative expression shutter glasses of usually can arranging in pairs or groups, after putting on the alternative expression shutter glasses, the left eye that can make the user is seen the image on the left side between in due course, right eye is then seen the image on the right.
Please refer to Fig. 1, the sequential chart when being the existing alternative expression shutter glasses use of expression.When the display equipment with the collocation of alternative expression shutter glasses is liquid crystal display, picture frame frequency (Frame Rate) must be risen to 120 hertz (Hz) by tradition 60 hertz (Hz), and increase (Vertical Blanking Interval) VBI between vertical dead space, a right eye drawing frame data R writes the RE of right eye place of alternative expression shutter glasses S, write again the LE of left eye place of alternative expression shutter glasses S with a left eye drawing frame data L, VBI opens the LE of left eye place between vertical dead space, therefore in proper order action is delivered to brain to be combined into stereopsis by human eyes (left eye and right eye) with image according to this.
Please refer to Fig. 2, Fig. 3 A and Fig. 3 B, the curve map of the driving voltage, GTG brightness value and the display position relation that represent respectively existing overvoltage drive, and the corresponding sequential chart of the picture view that on the display panel of liquid crystal display, presents when writing left eye and right eye.Accelerate the reaction of liquid crystal in general traditional overvoltage drive mode, because the display panel P top data P1 of liquid crystal display is written to respectively the left eye place of alternative expression shutter glasses S (as shown in Figure 1) with this drawing frame data F (n) and next drawing frame data F (n+1) and the opening time RT1 at right eye place grows (shown in Fig. 3 B), and cause liquid crystal to react excessive (Over Shooting), its driving voltage value is that D and GTG brightness value (curve) are G1, panel below data P3 is written to respectively the opening time RT2 shorter (shown in Fig. 3 B) at left eye place and the right eye place of alternative expression shutter glasses S (as shown in Figure 1) with this drawing frame data F (n) and next drawing frame data F (n+1), and cause the liquid crystal reaction not as good as (Under Shooting), its driving voltage value also is that D and GTG brightness value (curve) are G3, and the intermediate data P2 of panel is general normal liquid crystal reaction, its driving voltage value still is that D and GTG brightness value (curve) are G2, when wherein opening at the left eye place (or right eye place) of alternative expression shutter glasses S, its driving voltage is D and G1＞G3＞G2 (as shown in Figure 2), because GTG brightness value G1, G2, the inequality of G3, therefore have the not good problem of the quality of image, meaning is namely can produce ghost (Ghosting) and motion blur phenomenon (as shown in Figure 3A) on the light reaction of display panel P.
Summary of the invention
The object of the invention is to provide a kind of overvoltage drive method and device of liquid crystal display, to the different parameter list of different display position inquiries, obtain corresponding overvoltage driving voltage, overvoltage (Over Driving) is carried out in shown position make each zone obtain required brightness, produce ghost and motion blur phenomenon when avoiding showing.
To achieve these goals, the invention provides a kind of overvoltage drive method of liquid crystal display, is the GTG brightness value that compensates a liquid crystal display, said method comprising the steps of:
By data buffer unit output one present drawing frame data;
Deposit described present drawing frame data in a picture frame mnemon, and by described picture frame mnemon output one drawing frame data last time;
By described present drawing frame data and described last time drawing frame data with inquire about for some parameter lists and to should some parameter lists a driving voltage value in one of them;
Receive described present drawing frame data by a position scanning element, to judge a current position; And
Export described driving voltage value by a multiplexer at described current position.
To achieve these goals, the invention provides a kind of overvoltage drive device of liquid crystal display, is the GTG brightness value that compensates a liquid crystal display, and described overvoltage drive device comprises:
One data buffer unit is in order to export a present drawing frame data;
One picture frame mnemon in order to described present drawing frame data is deposited in, and is exported a drawing frame data last time;
Some parameter lists, in order to inquire about by described present drawing frame data and described last time drawing frame data and to should some parameter lists a driving voltage value in one of them;
One position scanning element is in order to receive described present drawing frame data, to judge a current position; And
One multiplexer is in order to export described driving voltage value at described current position.
The present invention be by scanning judging current position, and inquire about the driving voltage value in the corresponding parameter list so that the GTG brightness value is evenly distributed, so can avoid producing ghost (Ghosting) and motion blur phenomenon on the light reaction of display panel P.
Description of drawings
Sequential chart when Fig. 1 uses for the existing alternative expression shutter glasses of expression.
Fig. 2 is the curve map of driving voltage, GTG brightness value and the display position relation of the existing overvoltage drive of expression.
Fig. 3 A is the existing picture view that presents on the display panel of liquid crystal display of expression.
Corresponding sequential chart when Fig. 3 B writes left eye and right eye for expression is existing.
Fig. 4 A is the structure calcspar of the overvoltage drive device and method of expression one embodiment of the invention.
Fig. 4 B is the process flow diagram of the overvoltage drive method of the expression embodiment of the invention.
Fig. 5 is the curve map of driving voltage, GTG brightness value and the display position relation of expression overvoltage drive of the present invention.
The picture view that Fig. 6 A presents on the display panel of liquid crystal display for expression the present invention.
Corresponding sequential chart when Fig. 6 B writes left eye and right eye for expression the present invention.
Fig. 7 A judges the start sequential chart of current position for expression embodiment of the invention position scanning element.
Fig. 7 B judges the start process flow diagram of current position for expression embodiment of the invention position scanning element.
Embodiment
In order to make purpose of the present invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Please refer to Fig. 4 A and 4B, represent respectively the structure calcspar of overvoltage drive device of one embodiment of the invention and the process flow diagram of overvoltage drive.The overvoltage drive device 1 of the present embodiment is the GTG brightness value that compensates a liquid crystal display, liquid crystal display has N bar horizontal scanning line (will in rear detailed description), it comprises a data buffer unit (Data Buffer Unit) 2, one picture frame mnemon (Frame Memory Unit) 3, some parameter lists (Look-Up Table, LUT) 4, one position scanning element (Position Detecting Unit) 5, one multiplexer (Multiplexer, MUX) 6 and a control module (Control Unit) 7.
With data buffer unit 2 output present drawing frame data (This Frame) F (n), deposit in picture frame mnemon 3 present drawing frame data F (n) again, and export last time drawing frame data F (n-1), reaching last time by present drawing frame data F (n), drawing frame data F (n-1) inquires about and corresponding parameter list 4 one of them interior driving voltage value D (256 * 256), receive present drawing frame data F (n) by position scanning element 5 again, to judge current position, at last with multiplexer 6 outputting drive voltage value D on current position, wherein, each parameter list 4 (comprises LUT1 as shown in Figure 4, ..., LUTn) and driving voltage value D be stored in static random access memory (Static Random Access Memory, SRAM) or the flash memory (Flash); In addition, control module 7 reading, writing present drawing frame data F (n) and storing its address (Address) for control picture frame mnemon 3.
The implementation method of its overvoltage drive device 1 is as follows:
Step S1: by data buffer unit 2 outputs one present drawing frame data F (n);
Step S2: deposit present drawing frame data F (n) in picture frame mnemon 3, and by picture frame mnemon 3 output one drawing frame data F (n-1) last time;
Step S3: by present drawing frame data F (n) and last time drawing frame data F (n-1) to inquire about for all parameter lists 4 and corresponding all parameter lists driving voltage value D in one of them;
Step S4: receive present drawing frame data F (n) by position scanning element 5, to judge a current position; And
Step S5: export its corresponding driving voltage value D at current position by multiplexer 6.
Wherein, driving voltage value D is the GTG brightness value on the corresponding display panel that goes out liquid crystal display.
Refer again to Fig. 7 A and 7B, represent respectively start sequential chart and the process flow diagram of embodiment of the invention position scanning element judgement current position.Its step comprises:
Step S41: N bar horizontal scanning line is distinguished at least two zones;
Step S42 a: data enable signal (Data Enable) DE is transformed into height by hanging down;
Step S43: start the N bar horizontal scanning line that a sequential counter CLK counted and scanned liquid crystal display;
Step S44: when counting and scanning in when zone wherein at least two zones, position scanning element 5 judges that namely current position is a zone wherein at least two zones; And
Step S45: when counting and scanning in another when zone at least two zones, position scanning element 5 judges that namely current position is another zone.
Wherein, in the present embodiment at least two zones are divided into the upper, middle and lower Three regions.
Particularly, when data enable signal DE from low to high, and when sequential counter CLK count down to 1-K, position scanning element 5 namely notifies multiplexer 6 to adopt the first parameter list 4 (LUT1) to do output; When sequential counter CLK count down to (K+1)-2K, position scanning element 5 namely notified multiplexer 6 to adopt the second parameter list 4 (LUT2) to do output, and the rest may be inferred; Wherein, the K value is counted N less than the horizontal scanning line of display panel, and K is positive integer.
For instance, if the resolution of display panels is 1920 * 1080 (M * N), and be divided into the trizonal words in upper, middle and lower, then horizontal scanning line N=1080 and K=360, therefore the display panel upper area is 1-360 (horizontal scanning line is from top to bottom counted), zone line is 361-720, and lower zone then is 721-1080; So corresponding at display panel upper area (horizontal scanning line 1-360) is the first parameter list LUT1, and display panel zone line (horizontal scanning line 361-720) corresponding be the second parameter list LUT2, the rest may be inferred to n parameter list LUTn, and wherein OD represents overvoltage drive (Over Driving).Certainly, display panels can be divided into a plurality of zones, is not limited with the upper, middle and lower Three regions.
Refer again to Fig. 5, Fig. 6 A and Fig. 6 B, the curve map that represents respectively driving voltage, GTG brightness value and the display position relation of overvoltage drive of the present invention, and the corresponding sequential chart of the picture view that on the display panel of liquid crystal display, presents when writing left eye and right eye.Carry such as aforementioned existing technology, to do overvoltage drive with intermediate data P2 to table look-up to carry out the GTG brightness adjustment, therefore intermediate data P2 is less with respect to the impact of top data P1 and below data P3, thus aftermentioned embodiment of the present invention be above number formulary according to P1 and below the larger part of data P3 impact describe; And compared to aforementioned existing technology, the display panel P top data P1 of the liquid crystal display of embodiments of the invention is written to respectively the left eye place of alternative expression shutter glasses S (as shown in Figure 1) with this drawing frame data F (n) and next drawing frame data F (n+1) and the opening time RT1 at right eye place grows (shown in Fig. 6 B), and cause the liquid crystal reaction excessive, therefore the driving voltage value D in the parameter list 4 that corresponds to a little less than, to revise the reaction velocity of liquid crystal, such as driving voltage value D1 ' and GTG brightness value (curve) G1 ' of Fig. 5; Panel below data P3 is written to respectively the opening time RT2 shorter (shown in Fig. 6 B) at left eye place and the right eye place of alternative expression shutter glasses S (as shown in Figure 1) with this drawing frame data F (n) and next drawing frame data F (n+1), and cause the liquid crystal reaction too late, therefore the driving voltage value D2 ' in the parameter list 4 that corresponds to is strong (being overvoltage), to revise the reaction velocity of liquid crystal, such as driving voltage value D3 ' and GTG brightness value (curve) G3 ' of Fig. 5; And the intermediate data P2 of panel is general normal liquid crystal reaction, its driving voltage value is that D2 ' and GTG brightness value (curve) are G2 ', when wherein opening at the left eye place (or right eye place) of alternative expression shutter glasses S, D3 '＞D2 '＞D1 ' and G1 '=G2 '=G3 ' (as shown in Figure 5).
Because the present invention is to judge current position by scanning, and inquire about driving voltage value D in the corresponding optimal parameter table 4 (D1 ', D2 ', D3 '), so that being evenly distributed of GTG brightness value G1 ', G2 ', G3 ', so can avoid producing ghost (Ghosting) and motion blur phenomenon (as shown in Figure 6A) on the light reaction of display panel P.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the overvoltage drive method of a liquid crystal display is the GTG brightness value that compensates a liquid crystal display, it is characterized in that, said method comprising the steps of:
By data buffer unit output one present drawing frame data;
Deposit described present drawing frame data in a picture frame mnemon, and by described picture frame mnemon output one drawing frame data last time;
By described present drawing frame data and described last time drawing frame data with inquire about for some parameter lists and to should some parameter lists a driving voltage value in one of them;
Receive described present drawing frame data by a position scanning element, to judge a current position; And
Export described driving voltage value by a multiplexer at described current position.
2. the overvoltage drive method of liquid crystal display as claimed in claim 1 is characterized in that, described liquid crystal display has N bar horizontal scanning line, receives described present drawing frame data by a position scanning element, to judge the step of a current position, comprising:
Described N bar horizontal scanning line is distinguished at least two zones;
One data enable signal is transformed into height by hanging down;
Start a sequential counter and count and scan described N bar horizontal scanning line;
When counting and scanning in one of them when zone in described at least two zones, described position scanning element judges that namely described current position is one of them zone in described at least two zones; And
When counting and scanning in another when zone in described at least two zones, described position scanning element judges that namely described current position is another zone.
3. the overvoltage drive method of liquid crystal display as claimed in claim 2 is characterized in that, described at least two zones are the upper, middle and lower Three regions.
4. the overvoltage drive method of liquid crystal display as claimed in claim 1 is characterized in that, described method also comprises by a control module to control the step of described picture frame mnemon.
5. the overvoltage drive method of liquid crystal display as claimed in claim 4 is characterized in that, described control module be the described picture frame mnemon of control read, write described present drawing frame data and address thereof.
6. the overvoltage drive device of a liquid crystal display is the GTG brightness value that compensates a liquid crystal display,
It is characterized in that, described overvoltage drive device comprises:
One data buffer unit is in order to export a present drawing frame data;
One picture frame mnemon in order to described present drawing frame data is deposited in, and is exported a drawing frame data last time;
Some parameter lists, in order to inquire about by described present drawing frame data and described last time drawing frame data and to should some parameter lists a driving voltage value in one of them;
One position scanning element is in order to receive described present drawing frame data, to judge a current position; And
One multiplexer is in order to export described driving voltage value at described current position.
7. the overvoltage drive device of liquid crystal display as claimed in claim 6, it is characterized in that, described overvoltage drive device also comprises a sequential counter, described liquid crystal display has N bar horizontal scanning line, described N bar horizontal scanning line is distinguished at least two zones, be transformed into when high by low in a data enable signal, start described sequential counter and count and scan described N bar horizontal scanning line, when counting and scanning one of them when zone in described at least two zones, described position scanning element judges that namely described current position is one of them zone in described at least two zones, when counting and scanning in another when zone in described at least two zones, described position scanning element judges that namely described current position is another zone.
8. the overvoltage drive device of liquid crystal display as claimed in claim 7 is characterized in that, described at least two zones are the upper, middle and lower Three regions.
9. the overvoltage drive device of liquid crystal display as claimed in claim 6, described overvoltage drive device also comprises a control module, in order to control described picture frame mnemon.
10. the overvoltage drive device of liquid crystal display as claimed in claim 9 is characterized in that, described control module be the described picture frame mnemon of control read, write described present drawing frame data and address thereof.
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| CN 200910188518 CN102081909B (en) | 2009-11-30 | 2009-11-30 | Overvoltage drive method and device of liquid crystal display |
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| CN 200910188518 CN102081909B (en) | 2009-11-30 | 2009-11-30 | Overvoltage drive method and device of liquid crystal display |
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| CN102081909B true CN102081909B (en) | 2013-01-02 |
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| CN105575352A (en) * | 2016-03-02 | 2016-05-11 | 京东方科技集团股份有限公司 | Grid driving method, grid driving circuit and display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101083065A (en) * | 2006-05-30 | 2007-12-05 | 株式会社东芝 | Liquid crystal display device and driving method thereof |
| CN101251991A (en) * | 2008-03-20 | 2008-08-27 | 友达光电股份有限公司 | Image speedup drive apparatus and image speedup drive control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101083065A (en) * | 2006-05-30 | 2007-12-05 | 株式会社东芝 | Liquid crystal display device and driving method thereof |
| CN101251991A (en) * | 2008-03-20 | 2008-08-27 | 友达光电股份有限公司 | Image speedup drive apparatus and image speedup drive control method |
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Effective date of registration: 20130704 Address after: 350000, No. 6 West Road, Mawei District, Fujian, Fuzhou Patentee after: CPT DISPLAY TECHNOLOGY (SHENZHEN)CO., LTD. Patentee after: Chunghwa Picture Tubes Ltd. Address before: 518000, Guangming hi tech Industrial Park, Shenzhen, Guangdong, No. 9, Ming Tong Road, Baoan District Patentee before: CPT Display Technology Shenzhen Ltd. Patentee before: Chunghwa Picture Tubes Ltd. |
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