CN101533614B - Liquid crystal display device and drive method thereof - Google Patents
Liquid crystal display device and drive method thereof Download PDFInfo
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- CN101533614B CN101533614B CN 200810085277 CN200810085277A CN101533614B CN 101533614 B CN101533614 B CN 101533614B CN 200810085277 CN200810085277 CN 200810085277 CN 200810085277 A CN200810085277 A CN 200810085277A CN 101533614 B CN101533614 B CN 101533614B
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Abstract
The invention relates to a liquid crystal display device and a drive method thereof, which can supply different weighted white balanced codes and weighted over driven values aiming at each data wire and amend each image signal supplied to each pixel unit in a liquid crystal panel by matching with drive units with the same or different resistance values. Therefore, the invention not only can improve the uniformity of brightness of the liquid crystal panel, but also has no effect on transmittivity even under the condition of insufficient charging.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator signal of video signal compensation technique, particularly relate to a kind of liquid crystal indicator and driving method thereof that improves the liquid crystal panel lightness uniformity.
Background technology
Along with panel size strengthens, add the impact of height pressure side temperature and lighting tube brightness, so that panel is when low gray scale, naked eyes namely can be observed partially bright but the phenomenon that panel central authorities are partially dark in panel both sides, that is the uniformity of panel luminance is obviously not good when low gray scale; And along with the raising (120Hz) of the inhomogeneous variation of increase, the process component spacing (cell gap) of panel size and resolution, frame rate (frame rate), so that resistance-capacitance type load (resistive-capacitive loading in data volume increase, the manageable time shorten of data and the panel, RC loading) more aobvious serious for the impact of distorted signals, cause the not good phenomenon of the panel luminance uniformity more obvious.
Before for this phenomenon, the optical engineer only can just be scanned wave mode and do idio-morphosis, as passing through to reduce positive gate voltage (gate high-voltage, VGH) and cut the angle reduce scanning wave mode height, allow the undercharge of bilateral turntable driving input with Dimming, the partially bright phenomenon in panel both sides when reducing low gray scale, but the brightness of panel central authorities and both sides has different still unavoidablely; And such mode also can remote-effects to the charging of zone line, because generally speaking, the larger then thin-film transistor of positive gate voltage drain current is larger, charging rate is also just faster, the phenomenon that does not more have undercharge or reduce transmissivity occurs, if therefore reduce positive gate voltage, may cause the undercharge of zone line; So in order whole transmissivity not to be caused too large impact, reduce positive gate voltage and cut the angle still having certain limit.
In addition, generally also can and overdrive for white balance adjusts, but owing to only adjust the brightness of whole panel with one group of white balance code and one group of over-drive value, and can't adjust thus the luminance uniformity of promoting panel integral body.
In view of this, the present invention is directed to above-mentioned puzzlement, propose a kind of liquid crystal indicator and driving method thereof, to improve above-mentioned defective.
Summary of the invention
Main purpose of the present invention, provide a kind of liquid crystal indicator and driving method thereof, it provides after the different weighting over-drive value behind the white balance code and weighting for each data wire, and be combined with the driver element of identical or different resistance, the signal of video signal of inputting each pixel cell is made brightness adjustment, to solve the not good phenomenon of the panel luminance uniformity.
Another object of the present invention, provide a kind of liquid crystal indicator and driving method thereof, it need not sacrifice positive gate voltage for the contribution of thin-film transistor drain current charging rate, can improve positive gate voltage, reach the purpose of quick charge, can not affect because of undercharge the performance of transmissivity.
For achieving the above object, the present invention proposes a kind of driving method of liquid crystal indicator, be used for adjusting a plurality of signal of video signal that offer liquid crystal panel, described signal of video signal is sent to the interior a plurality of pixel cells of described liquid crystal panel through a plurality of driver elements and coupled a plurality of data wires, and the driving method of described liquid crystal indicator comprises the following steps:
(a) provide the white balance code;
(b) give described white balance code different a plurality of the first weighted values, obtain white balance code after a plurality of weightings;
(c) provide over-drive value;
(d) give described over-drive value different a plurality of the second weighted values, obtain over-drive value after a plurality of weightings, wherein said the second weighted value corresponding to described weighting after the white balance code; And
(e) choose after the required described weighting of each described data wire behind the white balance code and described weighting after the over-drive value, output to described driver element, be used for adjusting the described signal of video signal of each described pixel cell of input.
According to a further aspect in the invention, a kind of driving method of liquid crystal indicator is provided, be used for adjusting a plurality of signal of video signal that offer liquid crystal panel, described signal of video signal is sent to the interior a plurality of pixel cells of described liquid crystal panel through a plurality of driver elements and coupled a plurality of data wires, and the driving method of described liquid crystal indicator comprises the following steps:
The white balance code is provided;
Give described white balance code different a plurality of the first weighted values, obtain white balance code after a plurality of weightings;
Over-drive value is provided;
Give described over-drive value different a plurality of the second weighted values, obtain delivering to multiplexer in conjunction with over-drive value after a plurality of weightings of white balance code after the described weighting; And
Use circuit to choose the unit, choose after the required described weighting of each described data wire behind the white balance code and described weighting after the over-drive value from described multiplexer, output to described driver element, be used for adjusting the described signal of video signal of each described pixel cell of input.
In accordance with a further aspect of the present invention, provide a kind of driving method of liquid crystal indicator, be used for driving liquid crystal indicator, described liquid crystal indicator comprises a plurality of driver elements and coupled a plurality of data wires, and described driving method comprises:
Receive a plurality of signal of video signal;
According to described signal of video signal, obtain the white balance signal of video signal;
For the position of the described data wire of difference, described white balance signal of video signal is changed into white balance signal of video signal after the weighting;
For white balance signal of video signal after different described data wires and the described weighting, obtain the over-drive image signal; And
Use the described liquid crystal indicator of described over-drive image signal driver.
Below by by reference to the accompanying drawings in detail explanation of specific embodiment, when the effect that is easier to understand purpose of the present invention, technology contents, characteristics and reaches.
Description of drawings
Fig. 1 is the structural representation of the liquid crystal indicator of first embodiment of the invention;
Fig. 2 is the flow chart of the driving method of first embodiment of the invention;
Fig. 3 is the structural representation of the liquid crystal indicator of second embodiment of the invention;
Fig. 4 is the flow chart of the driving method of second embodiment of the invention.
Embodiment
Liquid crystal indicator disclosed by the invention and driving method thereof, its capable of regulating offers the signal of video signal to each pixel cell of liquid crystal panel, to reach the purpose that improves the liquid crystal panel lightness uniformity.
Liquid crystal indicator of the present invention has two kinds of execution modes, wherein the first embodiment as shown in Figure 1, liquid crystal indicator 10, comprise liquid crystal panel 12, driver element 14 and image process unit 16, the pixel cell 123 that has mutually perpendicular data wire 121 and scan line 122 on the liquid crystal panel 12 and be positioned at both intervening portions, driver element 14 are coupled to data wire 121 and image process unit 16.
Wherein, image process unit 16 comprises white balance code generation unit 18, be coupled to white balance code generation unit 20 after the weighting of white balance code generation unit 18, be coupled to the first multiplexer 22 of white balance code generation unit 20 after the weighting, be coupled to the over-drive value generation unit 24 of the first multiplexer 22, be coupled to over-drive value generation unit 26 after the weighting of over-drive value generation unit 24, and the second multiplexer 28 that is coupled to over-drive value generation unit 26 and driver element 14 after the weighting, other has circuit to choose unit 30, and it is coupled to the first multiplexer 22 and the second multiplexer 28.
The driving method flow process of the first embodiment of the present invention as shown in Figure 2, and as follows in conjunction with reference to Fig. 1 in detail its action being described in detail, at first, shown in step S10, provide the white balance code by white balance code generation unit 18, then, shown in step S12, white balance code generation unit 20 (can be the first multiplier) gives the first different weighted value of the white balance code after utilizing weighting, obtain delivering to the first multiplexer 22 behind the white balance code after the different weightings, provide over-drive value such as step S14 by over-drive value generation unit 24, over-drive value generation unit 26 (can be the second multiplier) gives the second different weighted value of over-drive value after utilizing weighting such as step S16, obtain delivering to the second multiplexer 28 after the over-drive value after the different weightings, utilize circuit to choose unit 30 such as step S18, choose after the required weighting of each data wire 121 over-drive value behind the white balance code and weighting from the first multiplexer 22 and the second multiplexer 28, allow after the required weighting of the first multiplexer 22 and the second multiplexer 28 selectivity output behind the white balance code and weighting over-drive value to driver element 14, be used for adjusting each signal of video signal that is input to each pixel cell 123, the signal of video signal after the adjustment can utilize driver element 14 and data wire 121 to drive corresponding pixel cell 123 at last.
Because the pixel cell 123 shown brightness at liquid crystal panel 12 centers are low than the both sides, therefore, if take the brightness of the pixel cell 123 of data wire 121 correspondences at liquid crystal panel 12 centers as benchmark (the first weighted value is as 1), then 121 of other data wires need to select the first weighted value greater than 0 and less than white balance code after 1 the weighting; In like manner, the reaction speed of the pixel cell 123 of available a certain data wire 121 correspondences is benchmark (the second weighted value is 1), then 121 of other data wires need to select the second weighted value greater than 0 and less than over-drive value after 1 the weighting, but the visual demand of the resistance sizes that should be noted driver element 14 adopts identical or different, if do not wish that the numerical value of the first weighted value or the second weighted value and 1 gap are excessive, optional with the different driver element 14 of resistance, it is different when at this moment, required the first weighted value of each pixel cell 123 and the second weighted value can the driver element 14 identical from cooperating resistance use.
The second embodiment of liquid crystal indicator of the present invention as shown in Figure 3, image process unit 16 comprises white balance code generation unit 18, be coupled to white balance code generation unit 20 (can be the first multiplier) after the weighting of white balance code generation unit 18, over-drive value generation unit 24, be coupled to over-drive value generation unit 26 (can be the second multiplier) after the weighting of white balance code generation unit 20 and this over-drive value generation unit 24 after this weighting, the circuit that is coupled to the multiplexer 32 of over-drive value generation unit 26 and driver element 14 after the weighting and is coupled to multiplexer 32 is chosen unit 30.
The driving method flow process of the second embodiment of the present invention is with reference to shown in Figure 4, and as follows in conjunction with reference to Fig. 3 in detail its action being described in detail, at first, such as step 20, provide the white balance code by white balance code generation unit 18, shown in step S22, white balance code generation unit 20 gives the first different weighted value of the white balance code after utilizing weighting, obtain white balance code after the different weightings, provide over-drive value such as step S24 by over-drive value generation unit 24, over-drive value generation unit 26 gives the second different weighted value of over-drive value after utilizing weighting such as step S26, obtain delivering to multiplexer 32 after the over-drive value after the different weightings, use circuit to choose unit 30 such as step S28, over-drive value after multiplexer 32 is chosen white balance code after the required weighting of each data wire 121 and corresponding its weighting, allow multiplexer 32 selectivity export after the required weighting of each data wire 121 behind the white balance code and weighting over-drive value to driver element 14, be used for adjusting each signal of video signal that is input to each pixel cell 123, the signal of video signal after the adjustment can utilize driver element 14 and data wire 121 to drive corresponding pixel cell 123 at last; And the first weighted value and the second weighted value are the numerical value between 0 to 1, and driver element 14 visual demands are used identical or different, and its reason is described as the first embodiment.
Generally, liquid crystal display apparatus driving circuit of the present invention makes liquid crystal indicator receive first signal of video signal, for the position of different pieces of information line, signal of video signal is changed into the rear signal of video signal of correction again, use at last and revise rear signal of video signal driving liquid crystal indicator.More particularly, liquid crystal display apparatus driving circuit of the present invention makes liquid crystal indicator receive first signal of video signal, obtain the white balance signal of video signal according to this signal of video signal, again for the position of different pieces of information line, the white balance signal of video signal is changed into white balance signal of video signal after the weighting, for white balance signal of video signal after different pieces of information line and the weighting, obtain the over-drive image signal afterwards, use at last over-drive image signal driver liquid crystal indicator.
The above is by embodiment characteristics of the present invention to be described, its purpose makes those skilled in the art can understand content of the present invention and is implementing according to this, and non-limiting claim of the present invention, therefore all other do not break away from spirit disclosed in this invention and the equivalence finished is modified or revised, must be included in the appended claim scope.
Claims (7)
1. the driving method of a liquid crystal indicator, be used for adjusting a plurality of signal of video signal that offer liquid crystal panel, described signal of video signal is sent to the interior a plurality of pixel cells of described liquid crystal panel through a plurality of driver elements and coupled a plurality of data wires, and the driving method of described liquid crystal indicator comprises the following steps:
(a) provide the white balance code;
(b) give described white balance code different a plurality of the first weighted values, obtain white balance code after a plurality of weightings;
(c) provide over-drive value;
(d) give described over-drive value different a plurality of the second weighted values, obtain over-drive value after a plurality of weightings, wherein said the second weighted value corresponding to described weighting after the white balance code; And
(e) choose after the required described weighting of each described data wire behind the white balance code and described weighting after the over-drive value, output to described driver element, be used for adjusting the described signal of video signal of each described pixel cell of input.
2. the driving method of liquid crystal indicator as claimed in claim 1, wherein in step (b), giving different described the first weighted value of described white balance code is to utilize the first multiplier to realize.
3. the driving method of liquid crystal indicator as claimed in claim 1 or 2, wherein, the numerical value of described the first weighted value is between 0 to 1.
4. the driving method of liquid crystal indicator as claimed in claim 1, wherein in step (d), giving different described the second weighted value of described over-drive value is to utilize the second multiplier to realize.
5. such as the driving method of claim 1 or 4 described liquid crystal indicators, wherein, the numerical value of described the second weighted value is between 0 to 1.
6. the driving method of a liquid crystal indicator, be used for adjusting a plurality of signal of video signal that offer liquid crystal panel, described signal of video signal is sent to the interior a plurality of pixel cells of described liquid crystal panel through a plurality of driver elements and coupled a plurality of data wires, and the driving method of described liquid crystal indicator comprises the following steps:
The white balance code is provided;
Give described white balance code different a plurality of the first weighted values, obtain white balance code after a plurality of weightings;
Over-drive value is provided;
Give described over-drive value different a plurality of the second weighted values, obtain delivering to multiplexer in conjunction with over-drive value after a plurality of weightings of white balance code after the described weighting; And
Use circuit to choose the unit, choose after the required described weighting of each described data wire behind the white balance code and described weighting after the over-drive value from described multiplexer, output to described driver element, be used for adjusting the described signal of video signal of each described pixel cell of input.
7. the driving method of a liquid crystal indicator is used for driving liquid crystal indicator, and described liquid crystal indicator comprises a plurality of driver elements and coupled a plurality of data wires, and described driving method comprises:
Receive a plurality of signal of video signal;
According to described signal of video signal, obtain the white balance signal of video signal;
For the position of the described data wire of difference, described white balance signal of video signal is changed into white balance signal of video signal after the weighting;
For white balance signal of video signal after different described data wires and the described weighting, obtain the over-drive image signal; And
Use the described liquid crystal indicator of described over-drive image signal driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810085277 CN101533614B (en) | 2008-03-10 | 2008-03-10 | Liquid crystal display device and drive method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810085277 CN101533614B (en) | 2008-03-10 | 2008-03-10 | Liquid crystal display device and drive method thereof |
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| Publication Number | Publication Date |
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| CN101533614A CN101533614A (en) | 2009-09-16 |
| CN101533614B true CN101533614B (en) | 2013-03-06 |
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| CN 200810085277 Expired - Fee Related CN101533614B (en) | 2008-03-10 | 2008-03-10 | Liquid crystal display device and drive method thereof |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201218151A (en) * | 2010-10-19 | 2012-05-01 | Chimei Innolux Corp | Overdriving apparatus and over driving value generating method |
| CN112992036B (en) * | 2021-02-26 | 2022-05-31 | 北海惠科光电技术有限公司 | Display panel driving method and device and display equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1428757A (en) * | 2001-12-26 | 2003-07-09 | Lg.飞利浦Lcd有限公司 | Data driving device and method for liquid crystal display |
| TW200620235A (en) * | 2004-12-13 | 2006-06-16 | Himax Tech Inc | Line compensated overdriving circuit of color sequential display and line compensated overdriving method thereof |
| CN1936654A (en) * | 2005-09-21 | 2007-03-28 | 晨星半导体股份有限公司 | Liquid crystal display control circuit and method thereof |
| CN1996457A (en) * | 2006-01-06 | 2007-07-11 | 晨星半导体股份有限公司 | LCD drive device and drive method therefor |
-
2008
- 2008-03-10 CN CN 200810085277 patent/CN101533614B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1428757A (en) * | 2001-12-26 | 2003-07-09 | Lg.飞利浦Lcd有限公司 | Data driving device and method for liquid crystal display |
| TW200620235A (en) * | 2004-12-13 | 2006-06-16 | Himax Tech Inc | Line compensated overdriving circuit of color sequential display and line compensated overdriving method thereof |
| CN1936654A (en) * | 2005-09-21 | 2007-03-28 | 晨星半导体股份有限公司 | Liquid crystal display control circuit and method thereof |
| CN1996457A (en) * | 2006-01-06 | 2007-07-11 | 晨星半导体股份有限公司 | LCD drive device and drive method therefor |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平11-168748A 1999.06.22 |
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