CN101334968A - Driving method of liquid crystal display - Google Patents
Driving method of liquid crystal display Download PDFInfo
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- CN101334968A CN101334968A CNA2007101262622A CN200710126262A CN101334968A CN 101334968 A CN101334968 A CN 101334968A CN A2007101262622 A CNA2007101262622 A CN A2007101262622A CN 200710126262 A CN200710126262 A CN 200710126262A CN 101334968 A CN101334968 A CN 101334968A
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Abstract
The invention relates to a driving method of a liquid crystal display (LCD). The driving method includes the following steps: a liquid crystal reacting time and a light displaying time of which a first display switch passes a first picture time is conducted till the end of the appearance of a reset time. Simultaneously, a second write switch is conducted to pre-transmit a pixel signal relevant to a second picture to a second storage capacitor. In the duration of the reset time of the first picture, when the first display switch and the second display switch are both closed up with the first write switch and the second write switch, a reset switch is conducted and a reset voltage signal is provide to a pixel electrode, wherein, the reset voltage signal is a voltage level in a first phase, and is a second voltage level in a second phase. By the method, the brightness of the display can be enhanced and a picture residual effect thereof can be reduced.
Description
Technical field
The present invention relates to a kind of driving method of display, and particularly relate to a kind of driving method of LCD.
Background technology
Sequential color display (Color Sequential Display) has advantages such as high brightness, high resolving power and high chroma, and (Light Emitting Diode is LED) to reach reduced volume and light-weighted purpose to use light emitting diode on light source.Yet, for to make redness (Red, R), green (Green, G), blue (Blue, image B) can superpositions and reach the mixed purpose of color, need to use liquid crystal or less thickness of liquid crystal layer faster on technology, to improve the reaction velocity of liquid crystal.
Fig. 1 is the driving circuit figure of available liquid crystal display.Fig. 2 is the sequential chart of the circuit operation of Fig. 1.Please also refer to Fig. 1 and Fig. 2, this LCD 100 comprises a plurality of liquid crystal cells.With liquid crystal cells 101 is example, and it comprises transistor MAw11, MBw11, MAd11, MBd11 and Mr11, memory capacitance CA11 and CB11, pixel electrode M11 and data line CH1.This LCD 100 shows first and second picture at first and second image time, and each first and second image time comprises that more liquid crystal reaction time, light show time and replacement time.This circuit is accelerated in order to make the reaction velocity of liquid crystal when GTG is changed, and adds a reset voltage signal Vrst to quicken the conversion of liquid crystal.Reset voltage signal Vrst is sent to pixel electrode M11 via transistor Mr11 in the replacement time.Because the coupling effect between pixel electrode M11 and capacitor C A11, CB11, influence is stored in the picture element signal in the electric capacity, cause the display brightness distortion, and, and then influence display quality also because the accumulation of residual charge causes image retention effects (ImageSticking Effect) on the pixel electrode.
Summary of the invention
One of purpose of the present invention is a kind of driving method of liquid crystal cells to be provided, can to get rid of the residual charge on the pixel electrode, so that circuit is not subjected to capacitance coupling effect, and then reduces the luminance distortion of its demonstration.
One of purpose of the present invention is that a kind of driving method of LCD is being provided, and makes circuit not be subjected to capacitance coupling effect, can reduce the luminance distortion of display, and reduces its image retention effects.
The invention provides a kind of driving method of liquid crystal cells, this liquid crystal cells comprises first switch, be relevant to first electric capacity of first switch, be relevant to the second switch of first electric capacity and be relevant to the pixel electrode of second switch.This driving method comprises the following steps: that conducting first switch is to transmit picture element signal to the first electric capacity.Provide the reset voltage signal to pixel electrode, wherein, the reset voltage signal is first voltage level between the first phase, is second voltage level in the second phase.First switch is opened circuit and the conducting second switch, make win electric capacity and pixel electrode electric connection.
The invention provides a kind of driving method of LCD, but but but but but this LCD comprise first and second write switch, be relevant to first and second write switch first and second memory capacitance, be relevant to first and second memory capacitance first and second display switch, be relevant to the pixel electrode of first and second display switch and be relevant to the data line of first and second write switch.This LCD shows first and second picture at first and second image time, and wherein, each first and second image time more includes the liquid crystal reaction time, a light shows time and a replacement time.
But this driving method comprises the following steps: this first display switch of conducting and shows the time through the liquid crystal reaction time and the light of first image time, before the replacement time finishes.In the liquid crystal reaction time and light demonstration time of first image time, but second write switch of conducting simultaneously is to transmit picture element signal to the second memory capacitance that is relevant to second picture in advance.In the replacement time of first image time, but and first display switch when still but but conducting and second display switch and second write switch are all closed, but this first write switch of conducting, and provide the reset voltage signal to pixel electrode by data line, wherein, the reset voltage signal is first voltage level between the first phase, is second voltage level in the second phase.
The present invention provides a kind of driving method of LCD in addition, but but but but but but this LCD comprise first and second write switch, be relevant to first and second write switch first and second memory capacitance, be relevant to first and second memory capacitance first and second display switch, be relevant to first and second display switch pixel electrode, be relevant to the data line of first and second write switch and be relevant to the reset switch of first and second display switch.This LCD shows first and second picture at first and second image time, and wherein, each first and second image time more includes the liquid crystal reaction time, a light shows time and a replacement time.
But this driving method comprises the following steps: conducting first display switch and shows the time through the liquid crystal reaction time and the light of first image time, finishes before the replacement time occurs.In the liquid crystal reaction time and light demonstration time of first image time, but second write switch of conducting simultaneously is to transmit picture element signal to the second memory capacitance that is relevant to second picture in advance.In the replacement time of first image time, but but and first and second display switch and first and second write switch when all closing, the conducting reset switch also provides the reset voltage signal to pixel electrode, wherein, the reset voltage signal is first voltage level between the first phase, is second voltage level in the second phase.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment of the present invention cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the driving circuit figure of available liquid crystal display.
Fig. 2 is the sequential chart of the circuit operation of Fig. 1.
Fig. 3 is the driving circuit figure of the liquid crystal cells of first embodiment of the invention.
Fig. 4 is the sequential chart according to Fig. 3.
Fig. 5 is the driving circuit figure of the LCD of second embodiment of the invention.
Fig. 6 is the sequential chart according to Fig. 5.
Fig. 7 is the driving circuit figure of the LCD of third embodiment of the invention.
Fig. 8 is the sequential chart according to Fig. 7.
The reference numeral explanation
100,500,700: LCD
101,300,501,701: liquid crystal cells
MAw11-MAw22, MBw11-MBw22, MAd11-MAd22, MBd11-MBd22, Mr11-Mr22: transistor
CA11-CA22, CB11-CB22: memory capacitance
M11-M22: pixel electrode
CH1-CH2: data line
DA, DB: display signal line
RST: reset signal line
Vrst: reset voltage signal
S1: first switch
S2: second switch
C1: first electric capacity
Srst, Tr11-Tr22: reset switch
WA: sweep trace
DA1: first display signal line
DB1: second display signal line
WA1-WA2: first sweep trace
WB1-WB2: second sweep trace
A11-A22: first common joint
B11-B22: second common joint
TAw11-TAw22, TBw11-TBw22: but first and second write switch
CsA11-CsA22, CsB11-CsB22: first and second memory capacitance
TAd11-TAd22, TBd11-TBd22: but first and second display switch.
Embodiment
First embodiment
Fig. 3 is the driving circuit figure of the liquid crystal cells of first embodiment of the invention.Switch is to implement it with transistor in the present embodiment, and each transistor has a grid, a drain electrode and an one source pole.Please refer to Fig. 3, this liquid crystal cells 300 comprises first switch S 1, first capacitor C 1, second switch S2, pixel electrode M11 and reset switch Srst.The grid of first switch S 1 is coupled to sweep trace WA, and its source electrode is coupled to data line CH1, and its drain electrode is coupled to first end of first capacitor C 1.Second end of first capacitor C 1 is coupled to earth terminal GND.The grid of second switch S2 is coupled to display signal line DA, and its source electrode is coupled to first end of first capacitor C 1, and its drain electrode is coupled to pixel electrode M11.The grid of reset switch Srst is coupled to reset signal line RST, and its source electrode receives a reset voltage signal Vrst, and its drain electrode is coupled to pixel electrode M11.
Fig. 4 is the sequential chart according to Fig. 3.Below explanation please also refer to Fig. 3 and Fig. 4.At first, after reset signal line RST enables, make reset switch Srst conducting and provide a reset voltage signal Vrst to pixel electrode M11.This reset voltage signal Vrst is that (first voltage level can determine according to picture element signal first voltage level among the Tres (during the Tres among the figure) between the first phase, for example be a common voltage), in second phase Tsc (during the Tsc among the figure) second voltage level (for example being set at a ground voltage), by this reset voltage signal Vrst, on the pixel electrode M11 remaining electric charge will be excluded.Behind reset signal line RST forbidden energy, when the voltage on the sweep trace WA is high level, first switch S, 1 conducting this moment, data line CH1 transmits picture element signal to the first capacitor C 1, and the voltage on display signal line DA is low level simultaneously, so not conducting of second switch S2.Afterwards, after picture element signal is stored in first capacitor C 1, first switch S 1 opens circuit with reset switch Srst, and the voltage on the display signal line DA transfers high level to and makes second switch S2 conducting, making the capacitor C 1 of winning electrically connect and drive pixel electrode M11 with pixel electrode M11 and showing this picture element signal.
In the present embodiment, also can carry out the replacement of pixel electrode M11 and the charging of first capacitor C 1 simultaneously, drive pixel electrode M11 again, or carry out the charging of first capacitor C 1 earlier, and then carry out the replacement of pixel electrode M11 and drive pixel electrode M11.As long as before next picture element signal exports pixel electrode M11 to, the replacement of carrying out pixel electrode M11 gets final product with the remaining electric charge of getting rid of among the pixel electrode M11.
Second embodiment
Fig. 5 is the driving circuit figure of the LCD of second embodiment of the invention.Switch is to implement it with transistor in the present embodiment, and each transistor has a grid, a drain electrode and an one source pole.Please refer to Fig. 5, this LCD 500 comprises a plurality of liquid crystal cells.With liquid crystal cells 501 is example, but but it comprises first and second write switch TAw11 and TBw11, first and second memory capacitance CsA11 and CsB11, first and second display switch TAd11 and TBd11, pixel electrode M11 and data line CH1.Wherein, this LCD 500 shows first and second picture at first and second image time, and each first and second image time comprises that more liquid crystal reaction time, light show time and replacement time.
But the grid of the first write switch TAw11 is coupled to the first sweep trace WA1, its source electrode is coupled to data line CH1, and its drain electrode is coupled to the first common joint A11.But the grid of the second write switch TBw11 is coupled to the second sweep trace WB1, its source electrode is coupled to data line CH1, and its drain electrode is coupled to the second common joint B11.First end of the first memory capacitance CsA11 is coupled to the first common joint A11, and its second end is coupled to earth terminal GND.First end of the second memory capacitance CsB11 is coupled to the second common joint B11, and its second end is coupled to an earth terminal GND.But the grid of the first display switch TAd11 is coupled to the first display signal line DA1, and its source electrode is coupled to the first common joint A11, and its drain electrode is coupled to pixel electrode M11.But the grid of the second display switch TBd11 is coupled to the second display signal line DB1, and its source electrode is coupled to the second common joint B11, and its drain electrode is coupled to pixel electrode M11.
Fig. 6 is the sequential chart according to Fig. 5, and below explanation please also refer to Fig. 5 and Fig. 6.In the driving process, with liquid crystal cells 501 is example, and the first memory capacitance CsA11 and the second memory capacitance CsB11 are staggered to drive pixel electrode M11, but when the first display switch TAd11 conducting, the second memory capacitance CsB11 can charge, with pre-loaded next picture element signal.Otherwise, but when the second display switch TBd11 conducting, the first memory capacitance CsA11 can charge, with pre-loaded next picture element signal.
In the present embodiment, be the example explanation with the first image time F1 and the second image time F2 respectively, the second image time F2 is after the first image time F1.At the liquid crystal of the first image time F1 in the reaction time, but first write switch (as TAw11, TAw12, TAw21, TAw22) but close all earlier and the first display signal line DA1 enables with conducting first display switch (as TAd11, TAd12, TAd21, TAd22).First memory capacitance (as CsA11, CsA12, CsA21, CsA22 etc.) but be electrically connected to pixel electrode (as M11, M12, M21, M22) driving liquid crystal via first display switch, and in the light demonstration time, show first picture.Simultaneously, in the write time of the first image time F1, second sweep trace (as WB1, WB2) can enable in regular turn to transmit picture element signal to the second memory capacitance (as CsB11, CsB12, CsB21, CsB22 etc.) that is relevant to second picture by data line (as CH1, CH2) in advance.
In the replacement time of the first image time F1, but first display switch keeps conducting, but and second display switch (as TBd11, TBd12, TBd21, TBd22) but all close with second write switch (as TBw11, TBw12, TBw21, TBw22).First sweep trace this moment (as WA1, WA2) enables to transmit a reset voltage signal Vrst by data line to pixel electrode, in order to the switching of acceleration liquid crystal, and the residual charge on the removing pixel electrode.Wherein, reset voltage signal Vrst Tres between the first phase is first voltage level, and second phase Tsc is second voltage level.Tres is uninevitable continuous with second phase Tsc between the first phase.
After the electric charge on the pixel electrode is reset, then enter the second image time F2.At this moment, at the liquid crystal of the second image time F2 in the reaction time, the first display signal line DA1 forbidden energy and the second display signal line DB1 enables made second memory capacitance electrically connect pixel electrode driving liquid crystal, and show second picture in the light demonstration time.Afterwards, carry out the operating process in write time and replacement time as the above-mentioned first image time F1.In the present embodiment, utilize two memory capacitance that liquid crystal cells is carried out the driving of alternative expression, and comprise the replacement time in latter stage, so that liquid crystal cells is reset at each image time.In addition, the above-mentioned first image time F1 and the second image time F2 only decide for distinguishing the picture display timing generator, there is no the restriction of sequencing.
The 3rd embodiment
Fig. 7 is the driving circuit figure of the LCD of third embodiment of the invention.Switch is to implement it with transistor in the present embodiment, and each transistor has a grid, a drain electrode and an one source pole.Please refer to Fig. 7, this LCD 700 comprises a plurality of liquid crystal cells.With liquid crystal cells 701 is example, but but it comprises first and second write switch TAw11 and TBw11, first and second memory capacitance CsA11 and CsB11, first and second display switch TAd11 and TBd11, pixel electrode M11, data line CH1 and reset switch Tr11.Wherein, this LCD 700 shows first and second picture at first and second image time, and each first and second image time comprises that more liquid crystal reaction time, light show time and replacement time.
But the grid of the first write switch TAw11 is coupled to the first sweep trace WA1, its source electrode is coupled to data line CH1, and its drain electrode is coupled to the first common joint A11.But the grid of the second write switch TBw11 is coupled to the second sweep trace WB1, its source electrode is coupled to data line CH1, and its drain electrode is coupled to the second common joint B11.First end of the first memory capacitance CsA11 is coupled to the first common joint A11, and its second end is coupled to earth terminal GND.First end of the second memory capacitance CsB11 is coupled to the second common joint B11, and its second end is coupled to an earth terminal GND.But the grid of the first display switch TAd11 is coupled to the first display signal line DA1, and its source electrode is coupled to the first common joint A11, and its drain electrode is coupled to pixel electrode M11.But the grid of the second display switch TBd11 is coupled to the second display signal line DB1, and its source electrode is coupled to the second common joint B11, and its drain electrode is coupled to pixel electrode M11.The grid of reset switch Tr11 is coupled to reset signal line RST, and its source electrode receives a reset voltage signal Vrst, and its drain electrode is coupled to pixel electrode M11.
Fig. 8 is the sequential chart according to Fig. 7, and below explanation please also refer to Fig. 7 and Fig. 8.In the driving process, with liquid crystal cells 701 is example, and the first memory capacitance CsA11 and the second memory capacitance CsB11 are staggered to drive pixel electrode M11, but when the first display switch TAd11 conducting, the second memory capacitance CsB11 can charge, with pre-loaded next picture element signal.Otherwise, but when the second display switch TBd11 conducting, the first memory capacitance CsA11 can charge, with pre-loaded next picture element signal.
In the present embodiment, be the example explanation with the first image time F1 and the second image time F2 respectively, the second image time F2 is after the first image time F1.At the liquid crystal of the first image time F1 in the reaction time, but first write switch (as TAw11, TAw12, TAw21, TAw22) but all close and the first display signal line DA1 enables with conducting first display switch (as TAd11, TAd12, TAd21, TAd22).First memory capacitance (as CsA11, CsA12, CsA21, CsA22 etc.) but be electrically connected to pixel electrode (as M11, M12, M21, M22) driving liquid crystal via first display switch, and in the light demonstration time, show first picture.Simultaneously, in the write time of the first image time F1, second sweep trace (as WB1, WB2) can enable in regular turn to transmit picture element signal to the second memory capacitance (as CsB11, CsB12, CsB21, CsB22 etc.) that is relevant to second picture by data line (as CH1, CH2) in advance.
In the replacement time of the first image time F1, but but but first display switch, first write switch, second display switch (as TBd11, TBd12, TBd21, TBd22) but all close with second write switch (as TBw11, TBw12, TBw21, TBw22).This moment, reset signal line RST enabled to transmit a reset voltage signal Vrst to pixel electrode with conducting reset switch (as Tr11, Tr12, Tr21, Tr22) and by reset switch, in order to the switching of acceleration liquid crystal, and the residual charge on the removing pixel electrode.Wherein, reset voltage signal Vrst Tres between the first phase is first voltage level, and second phase Tsc is second voltage level.Tres is uninevitable continuous with second phase Tsc between the first phase.
After the electric charge on the pixel electrode is reset, then enter the second image time F2.At this moment, at the liquid crystal of the second image time F2 in the reaction time, the first display signal line DA1 forbidden energy and the second display signal line DB1 enables made second memory capacitance electrically connect pixel electrode driving liquid crystal, and show second picture in the light demonstration time.Afterwards, carry out the operating process in write time and replacement time as the above-mentioned first image time F1.In the present embodiment, utilize two memory capacitance that liquid crystal cells is carried out the driving of alternative expression, and comprise the replacement time in latter stage, so that liquid crystal cells is reset at each image time.In addition, the above-mentioned first image time F1 and the second image time F2 only decide for distinguishing the picture display timing generator, there is no the restriction of sequencing.
Compare the foregoing description and existing circuit, reset voltage signal Vrst Tres between the first phase of the foregoing description is first voltage level (for example being common voltage or dark attitude voltage), and be second voltage level (for example ground voltage) at second phase Tsc, wherein, Tres and second phase Tsc are continuously uninevitable between the first phase.So way can be between the first phase Tres accelerate the reaction velocity of liquid crystal, second phase Tsc can remove on the pixel electrode remaining electric charge.And the reset voltage signal Vrst of available circuit can only accelerate the reaction velocity of liquid crystal, but makes the display brightness distortion owing to capacitance coupling effect influence is stored in picture element signal in the electric capacity.Significantly, driving method proposed by the invention can eliminate capacitance coupling effect effectively and eliminate in the pixel electrode electric capacity remaining electric charge, therefore, can recover the due brightness of display and alleviate the image retention effects that causes because of the electric charge accumulation.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any affiliated technical field has knows the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining of the present invention.
Claims (17)
1. the driving method of a liquid crystal cells, this liquid crystal cells comprises one first switch, be relevant to one first electric capacity of this first switch, be relevant to a second switch of this first electric capacity and be relevant to a pixel electrode of this second switch, and this driving method comprises the following steps:
This first switch of conducting is to transmit a picture element signal to this first electric capacity;
Provide a reset voltage signal to this pixel electrode, wherein, this reset voltage signal is one first voltage level between a first phase, is one second voltage level in a second phase; And
This first switch is opened circuit and this second switch of conducting, make this first electric capacity and this pixel electrode electrically connect.
2. driving method as claimed in claim 1, wherein, this second phase is less than between this first phase.
3. driving method as claimed in claim 1, wherein, this first voltage level is set to according to this picture element signal and determines.
4. driving method as claimed in claim 1, wherein, this first voltage level is set to a common voltage.
5. driving method as claimed in claim 1, wherein, this second voltage level is set to a ground voltage.
6. driving method as claimed in claim 1, wherein, this reset voltage signal is to provide by a reset switch.
7. driving method as claimed in claim 6, wherein, discontinuous between this first phase with this second phase.
8. the driving method of a LCD, but this LCD comprises first and second write switch, but one is relevant to first and second memory capacitance of this first and second write switch, but one is relevant to first and second display switch of this first and second memory capacitance, but one is relevant to a pixel electrode of this first and second display switch, but and be relevant to a data line of this first and second write switch, this LCD shows first and second picture at first and second image time, wherein, each this first and second image time more includes the liquid crystal reaction time, one light shows time and a replacement time, and this driving method comprises the following steps:
(a) but this first display switch of conducting shows the time through this liquid crystal reaction time of this first image time with this light, before this replacement time end;
(b) in this liquid crystal reaction time and this light demonstration time of this first image time, but this second write switch of conducting simultaneously is relevant to a picture element signal of this second picture to this second memory capacitance to transmit in advance; And
(c) in this replacement time of this first image time, but and this first display switch when still but but conducting and this second display switch and this second write switch are all closed, but this first write switch of conducting, and provide a reset voltage signal to this pixel electrode by this data line, wherein, this reset voltage signal is one first voltage level between a little first phase, is one second voltage level in a second phase.
9. driving method as claimed in claim 8, wherein, this first voltage level is to determine according to this picture element signal.
10. driving method as claimed in claim 8, wherein, this first voltage level is set to a common voltage.
11. driving method as claimed in claim 8, wherein, this second voltage level is set to a ground voltage.
12. driving method as claimed in claim 8, wherein, this second phase is less than between this first phase.
13. the driving method of a LCD, but this LCD comprises first and second write switch, but one is relevant to first and second memory capacitance of this first and second write switch, but one is relevant to first and second display switch of this first and second memory capacitance, but one is relevant to a pixel electrode of this first and second display switch, but one is relevant to a data line of this first and second write switch, but and be relevant to a reset switch of this first and second display switch, this LCD shows first and second picture at first and second image time, wherein, each this first and second image time more includes the liquid crystal reaction time, one light shows time and a replacement time, and this driving method comprises the following steps:
(a) but this first display switch of conducting shows the time with this light, end before this replacement time occurs through this liquid crystal reaction time of this first image time;
(b) in this liquid crystal reaction time and this light demonstration time of this first image time, but this second write switch of conducting simultaneously is relevant to a picture element signal of this second picture to this second memory capacitance to transmit in advance; And
(c) in this replacement time of this first image time, but but and this first and second display switch and this first and second write switch when all closing, this reset switch of conducting also provides a reset voltage signal to this pixel electrode, wherein, this reset voltage signal is one first voltage level between a first phase, is one second voltage level in a second phase.
14. driving method as claimed in claim 13, wherein, this first voltage level determines according to this picture element signal.
15. driving method as claimed in claim 13, wherein, this first voltage level is set to a common voltage.
16. driving method as claimed in claim 13, wherein, this second voltage level is set to a ground voltage.
17. driving method as claimed in claim 13, wherein, this second phase is less than between this first phase.
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| CNA2007101262622A CN101334968A (en) | 2007-06-26 | 2007-06-26 | Driving method of liquid crystal display |
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| CNA2007101262622A CN101334968A (en) | 2007-06-26 | 2007-06-26 | Driving method of liquid crystal display |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1501343A (en) * | 2002-11-15 | 2004-06-02 | 奇景光电股份有限公司 | Drive circuit for liquid crystal unit structure and control method thereof |
| US20050253796A1 (en) * | 2004-05-17 | 2005-11-17 | Park Jun-Ho | Liquid crystal display and a driving method thereof |
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- 2007-06-26 CN CNA2007101262622A patent/CN101334968A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1501343A (en) * | 2002-11-15 | 2004-06-02 | 奇景光电股份有限公司 | Drive circuit for liquid crystal unit structure and control method thereof |
| US20050253796A1 (en) * | 2004-05-17 | 2005-11-17 | Park Jun-Ho | Liquid crystal display and a driving method thereof |
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Application publication date: 20081231 |