CN1949347A - Driving method for liquid crystal display - Google Patents
Driving method for liquid crystal display Download PDFInfo
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- CN1949347A CN1949347A CN 200510100353 CN200510100353A CN1949347A CN 1949347 A CN1949347 A CN 1949347A CN 200510100353 CN200510100353 CN 200510100353 CN 200510100353 A CN200510100353 A CN 200510100353A CN 1949347 A CN1949347 A CN 1949347A
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- liquid crystal
- driving method
- pixel
- display time
- crystal indicator
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Abstract
The invention relates to a driving method to drive display device to display image data. The device includes backlight module and plural liquid crystal pixels. And the backlight module contains plural light emitting brightness levels. The driving method includes following steps: separating the image display section to plural sub-display sections, when liquid crystal open or close at the display section, the backlight would open or close at the sub-display section, controlling the switch state of the liquid crystal pixel and light emitting brightness level of backlight module and light emitting time to realize gray scale display. The invention could make the image of LCD device equal.
Description
[technical field]
The present invention relates to a kind of driving method of liquid crystal indicator.
[background technology]
Because liquid crystal indicator has advantages such as in light weight, thin thickness, power consumption are little, thereby is widely used in modernized information equipments such as TV, notebook computer, mobile phone, personal digital assistant.
A kind of liquid crystal indicator of prior art can be consulted Fig. 1, this liquid crystal indicator 100 comprises the capable scan electrode parallel to each other 101 of n, m row parallel to each other and with n line scanning electrode 101 vertically insulated crossing data electrodes 102, and a plurality of thin film transistor (TFT) (Thin Film Transistor, TFT) 104 that drive pixel electrode 103 as on-off element.These a plurality of thin film transistor (TFT)s 104 are positioned at the intersection of this scan electrode 101 and this data electrode 102, and the grid 1040 of this thin film transistor (TFT) 104 is connected to scan electrode 101, and source electrode 1041 is connected to data electrode 102, and drain electrode 1042 is connected to pixel electrode 103.Each scan line comprises m pixel electrode 103, and this pixel electrode 103 forms an electric capacity 107 with public electrode 105.
The drive waveforms figure of this liquid crystal indicator 100 sees also Fig. 2 (a) and (b) and reaches (c), Fig. 2 (a) is the grid 1040 waveform voltage signal figure of thin film transistor (TFT) 104, Fig. 2 (b) is the source electrode 1041 waveform voltage signal figure of thin film transistor (TFT) 104, and Fig. 2 (c) is pixel electrode 103 waveform voltage signal figure.
During the first frame picture, i.e. t
1～t
3During this time, t
1Constantly, gate drive apparatus (figure does not show) provides scan voltage V
gThe grid 1040 of drive thin film transistors 104, thin film transistor (TFT) 104 is opened, and source electrode driving device (figure does not show) provides a driving voltage V simultaneously
d Source electrode 1041, drain electrode 1042 by thin film transistor (TFT) 104 offer pixel electrode 103, and the voltage of pixel electrode 103 is with driving voltage V
dVariation become the voltage V of same amplitude
P1t
2Constantly, at scanning voltage V
gUnder the control, thin film transistor (TFT) 104 cuts out, this voltage V
P1Kept by electric capacity 107, up to this thin film transistor (TFT) 104 at t
3Till opening once more constantly.
In like manner, during the second frame picture shows, t
3Constantly, at scanning voltage V
gUnder the control, the voltage of pixel electrode 103 is because this driving voltage-V
dVariation and become the voltage V of another amplitude
P2t
4Constantly, at scanning voltage V
gUnder the control, thin film transistor (TFT) 104 cuts out, this voltage V
P2Kept by electric capacity 107.
Conventional ADS driving voltage V
dCorresponding one by one with image gray-scale level, show that the identical image data need apply identical driving voltage V
dConsider this liquid crystal indicator 100 general twisted-nematic (Twist Nematic that use, TN) type liquid crystal, the difference of manufacture method can cause the pixel capacitance 107 of different pixels on this liquid crystal panel 100 different, and time that different pixels electric capacity 107 discharges and recharges and the electric current that discharges and recharges are all different.At different pixels, even apply the last pixel capacitance sustaining voltage V of institute of same drive voltage Vd with different pixels electric capacity 107
pAlso different, cause the penetrance of last pixel different, different pixels can produce different-effect when showing the identical image data, so these liquid crystal indicator 100 pictures show inhomogeneous.
[summary of the invention]
Show uneven problem in order to solve the liquid crystal indicator picture, be necessary to provide a kind of liquid crystal indicator picture that makes to show uniform driving method.
A kind of driving method is used to drive liquid crystal indicator with the display image data.This liquid crystal indicator comprises a module backlight and a plurality of liquid crystal pixel.This method comprises the steps: a picture display time interval is divided into a plurality of sub-display time intervals, and this liquid crystal pixel is opened or closed at this sub-display time interval, and this module backlight is opened or closed at this sub-display time interval, and this module backlight has a plurality of luminosity grades; Control the on off state of this liquid crystal pixel simultaneously and open duration, luminous brightness degree and the luminous duration of this module backlight, make this pixel corresponding with the GTG of required display image data, realize that GTG shows at the integration of a picture display time interval iuuminting amount.
Compared to prior art, in this driving method, because only having at this sub-display time interval, this liquid crystal pixel opens or closes two states, driving voltage only need have two kinds of states, liquid crystal display is dark attitude when this driving voltage is zero, promptly closes, and liquid crystal display was bright attitude when this driving voltage was higher than a threshold values, transmittance is identical, promptly opens.By the on off state and unlatching duration, luminous brightness degree and the luminous duration of this module backlight of controlling this liquid crystal pixel, make this liquid crystal pixel corresponding with the GTG of required display image data, realize that GTG shows at the integration of a picture display time interval iuuminting amount.Even manufacture method is variant, different pixels has different pixel capacitances, and when this driving method drove different pixels, the penetrance of different pixels was identical, display effect unanimity when then different pixels shows the identical image data, and then picture is shown evenly.
[description of drawings]
Fig. 1 is the synoptic diagram of prior art liquid crystal indicator.
Fig. 2 (a) is the scan electrode voltage V of liquid crystal indicator shown in Figure 1
gThe waveform synoptic diagram.
Fig. 2 (b) is the data electrode voltage V of liquid crystal indicator shown in Figure 1
dThe waveform synoptic diagram.
Fig. 2 (c) is the pixel electrode voltage V of liquid crystal indicator shown in Figure 1
pThe waveform synoptic diagram.
Fig. 3 is the liquid crystal indicator synoptic diagram that driving method of the present invention drove.
Fig. 4 (a) is a liquid crystal indicator scan electrode voltage waveform view of the present invention.
Fig. 4 (b) is a liquid crystal indicator data electrode voltage waveform view of the present invention.
Fig. 4 (c) is a liquid crystal indicator pixel electrode voltage waveform synoptic diagram of the present invention.
Fig. 4 (d) is a liquid crystal indicator of the present invention module brightness backlight synoptic diagram.
Fig. 4 (e) is the light transmittance waveform synoptic diagram of liquid crystal indicator liquid crystal pixel of the present invention.
[embodiment]
See also Fig. 3, be the liquid crystal indicator 200 that driving method of the present invention drove.This liquid crystal indicator 200 comprises the capable scan electrode parallel to each other 201 of n, m row parallel to each other and with n line scanning electrode 201 vertically insulated crossing data electrodes 202, a plurality of public electrodes 205 a plurality ofly drive the thin film transistor (TFT) 204 and of pixel electrode 203 as the module backlight (figure do not show) that planar light is provided as on-off element.These a plurality of thin film transistor (TFT)s 204 are positioned at the intersection of scan electrode 201 and data electrode 202, and its grid 2040 is connected to scan electrode 201, and its source electrode 2041 is connected to data electrode 202, and its drain electrode 2042 is connected to pixel electrode 203.Each scan line comprises m pixel electrode 203, and each this pixel electrode 203 forms an electric capacity 207 with each public electrode 205.
Please reach (e) with reference to figure 4 (a) and (b), (c), (d) in the lump, be the synoptic diagram of liquid crystal display apparatus driving circuit of the present invention.Fig. 4 (a) is thin film transistor (TFT) 204 grids 2040 waveform voltage signal figure, Fig. 4 (b) is thin film transistor (TFT) 204 source electrodes 2041 waveform voltage signal figure, Fig. 4 (c) is the waveform voltage signal figure of pixel electrode 203, Fig. 4 (d) is the brightness synoptic diagram of module backlight, and Fig. 4 (e) is the light transmittance oscillogram of liquid crystal pixel.
Liquid crystal display apparatus driving circuit of the present invention is as follows: a picture display time interval is divided into a sub-display time interval T
0～T
A-1, the luminosity grade of module backlight is divided into b rank L
0～L
B-1, a and b can be any number in 8,16,32 or 64, a and b can be identical, also can be different.A plurality of liquid crystal pixels that this picture display time interval shows only have at this sub-display time interval opens or closes two states, each duration of opening can less than, be equal to or greater than this sub-display time interval, this module backlight is opened or is closed at this sub-display time interval, this module backlight is luminous to have a plurality of brightness degrees, each duration of opening can less than, be equal to or greater than this sub-display time interval.
For convenience of description, with a=8, b=8 is an example, and a picture display time interval (F) is divided into 8 sub-display time interval T
0～T
7, the luminosity grade of module backlight is divided into 8 rank L
0～L
7
At T
0During this time, t
0Constantly, gate drive apparatus (figure does not show) provides scan voltage V
gThe grid 2040 of drive thin film transistors 204, thin film transistor (TFT) 204 is opened; Source electrode driving device (figure does not show) provides a driving voltage V simultaneously
s Source electrode 2041, drain electrode 2042 by thin film transistor (TFT) 204 are applied to pixel electrode 203, and pixel voltage is with driving voltage V
sBecome the voltage V of same amplitude
pt
0' constantly, at scanning voltage V
gUnder the control, this thin film transistor (TFT) 204 cuts out, pixel voltage V
pKept by electric capacity 207.At T
0During this time, module backlight provides L simultaneously
0Brightness degree backlight, at this moment, pixel is at pixel voltage V
pEffect is lighted by module backlight down, changes bright attitude into by initial dark attitude, promptly opens.
At T
1During this time, t
1Constantly, gate drive apparatus (figure does not show) provides scan voltage V
gThe grid 2040 of drive thin film transistors 204, thin film transistor (TFT) 204 is opened; Source electrode driving device (figure does not show) provides a driving voltage V simultaneously
s Source electrode 2041, drain electrode 2042 by thin film transistor (TFT) 204 are applied to pixel electrode 203, and pixel voltage is with driving voltage V
sBecome the voltage V of same amplitude
pt
1' constantly, at scanning voltage V
gUnder the control, this thin film transistor (TFT) 204 cuts out, pixel voltage V
pKept by electric capacity 207.At T
1During this time, module backlight provides L simultaneously
1Brightness degree backlight, at this moment, pixel is lighted by module backlight, continues as bright attitude.
At T
2During this time, t
2Constantly, gate drive apparatus (figure does not show) provides scan voltage V
gThe grid 2040 of drive thin film transistors 204, thin film transistor (TFT) 204 is opened; Source electrode driving device (figure does not show) provides a recovery voltage V simultaneously
h Source electrode 2041, drain electrode 2042 by thin film transistor (TFT) 204 are applied to pixel electrode 203, and pixel voltage becomes the voltage V of same amplitude with recovery voltage Vh
h'; t
2' constantly, at scanning voltage V
gUnder the control, this thin film transistor (TFT) 204 cuts out, pixel voltage V
h' kept by electric capacity 207.At T
2During this time, module backlight provides L simultaneously
2Brightness degree backlight, at this moment, though module backlight provides light source, pixel is at pixel voltage V
h' effect transfers dark attitude to by bright attitude down, promptly closes.
At T
3During this time, t
3Constantly, gate drive apparatus (figure does not show) provides scan voltage V
gThe grid 2040 of drive thin film transistors 204, thin film transistor (TFT) 204 is opened; Source electrode driving device (figure does not show) provides a driving voltage V simultaneously
s Source electrode 2041, drain electrode 2042 by thin film transistor (TFT) 204 are applied to pixel electrode 203, and pixel voltage is with driving voltage V
sBecome the voltage V of same amplitude
pt
3' constantly, at scanning voltage V
gUnder the control, this thin film transistor (TFT) 204 cuts out, pixel voltage V
pKept by electric capacity 207.At T
3During this time, module backlight provides L simultaneously
3Brightness degree backlight, at this moment, pixel is at pixel voltage V
pEffect is lighted by module backlight down, changes bright attitude into by dark attitude.
The rest may be inferred, at T
7During this time, t
7Constantly, gate drive apparatus (figure does not show) provides scan voltage V
gThe grid 2040 of drive thin film transistors 204, thin film transistor (TFT) 204 is opened; Source electrode driving device (figure does not show) provides a driving voltage V simultaneously
s Source electrode 2041, drain electrode 2042 by thin film transistor (TFT) 204 are applied to pixel electrode 203, and pixel voltage is with driving voltage V
sBecome the voltage V of same amplitude
pt
7' constantly, at scanning voltage V
gUnder the control, this thin film transistor (TFT) 204 cuts out, pixel voltage V
pKept by electric capacity 207.At T
7During this time, module backlight provides L simultaneously
7Brightness degree backlight, at this moment, pixel is lighted by module backlight, continues as bright attitude.Arrive this, a picture display time interval finishes.
Because this driving method has relatively high expectations to the reaction velocity of liquid crystal, so this liquid crystal indicator can adopt reaction velocity liquid crystal faster, and as ferroelectric liquid crystals, its reaction velocity can reach the microsecond grade.Present ferroelectric liquid crystals can be divided into two kinds, a kind of is surface-stable ferroelectric liquid crystals (Surface StabilizedFerroelectric Liquid Crystal, SSFLC), another kind then be gentle formula ferroelectric liquid crystals (Soft Mode Ferroelectric Liquid Crystal, SMFLC).The former liquid crystal has only two stable states, makes penetrance have only two kinds of variations, and then (Twist Nematic, TN) liquid crystal of type has multiple stable state to the latter, therefore can show multiple penetrance as twisted-nematic.For fear of the image of multiple penetrance, can adopt the surface-stable ferroelectric liquid crystals to the picture show uniformity.
By controlling opening (On) or closing the unlatching duration (t) of (Off) state (A), this liquid crystal pixel, luminosity grade (L) and four parameters of the luminous duration of this module backlight (T) of this module backlight of this liquid crystal pixel, make this pixel corresponding with the GTG of the image document of required demonstration, realize that GTG shows in the integration of a picture display time interval iuuminting amount.Therefore, the GTG that just can reach image document by the combination of controlling above-mentioned several variablees shows, that is:
Total light transmission amount=∫ LTAtdt
The opening of this liquid crystal pixel (On) or (Off) state of closing (A) are 1 when opening, and are 0 when closing.
Because this liquid crystal pixel only has unlatching or closes two states in this sub-display time interval, driving voltage only needs two states, and liquid crystal display is dark attitude when this driving voltage is zero, and liquid crystal display was bright attitude when this driving voltage was higher than a threshold values, and transmittance is identical.Even manufacture method is variant, different pixels has different pixel capacitances, and when this driving method drove different pixels, the penetrance of different pixels was identical, and then different pixels shows identical image document display effect unanimity, and then picture is shown evenly.
In order to improve the dynamic display effect of picture, also can make a certain or a plurality of sub-display time intervals in the picture display time interval as black plug period Tr, during black plug period Tr, close pixel or module backlight all the time, also can the two close simultaneously.Simultaneously, the unlatching duration of luminosity grade, the luminous duration of module backlight or the liquid crystal pixel of other sub-display time interval module backlight that also can this picture display time interval of corresponding increase is to increase the total light transmission amount of this picture display time interval.
This picture display time interval can be the time that shows that a plurality of related pixels are used, perhaps shows delegation or used time of a row pixel, perhaps shows a plurality of used times of row or column pixel.
Wherein, this driving method can show by the luminous realization GTG of a cold cathode ray tube light emitting source, a LED source or an incandescent light source in this module backlight of control, can also or increase colored filter by a plurality of colorful light-emitting diode light-sources of control and realize colored the demonstration.
Claims (10)
1. the driving method of a liquid crystal indicator, wherein this liquid crystal indicator comprises a module backlight and a plurality of liquid crystal pixel, and this module backlight luminous has a plurality of brightness degrees, and this method comprises the steps:
One picture display time interval is divided into a plurality of sub-display time intervals, and a plurality of liquid crystal pixels that this picture display time interval shows are opened or are closed at this sub-display time interval, and this module backlight is opened or closed at this sub-display time interval;
Control the on off state and luminosity grade and the luminous duration of opening duration, this module backlight of this liquid crystal pixel simultaneously, make this liquid crystal pixel corresponding with the GTG of required display image data, show to realize GTG at the integration of this picture display time interval iuuminting amount.
2. the driving method of liquid crystal indicator according to claim 1 is characterized in that: this liquid crystal pixel total light transmission amount and the on off state (A) of this liquid crystal pixel, the unlatching duration (t) of this liquid crystal pixel, the luminosity grade (L) of this module backlight and luminous duration (T) of this module backlight in this picture display time interval meet following funtcional relationship:
Total light transmission amount=∫ LTAtdt.
3. the driving method of liquid crystal indicator as claimed in claim 1 is characterized in that: the luminous of this module backlight realizes by control one cold cathode ray tube.
4. the driving method of liquid crystal indicator as claimed in claim 1 is characterized in that: this method realizes colored the demonstration by colored filter.
5. the driving method of liquid crystal indicator as claimed in claim 1 is characterized in that: this GTG can be a kind of in 8 rank, 16 rank, 32 rank and 64 rank, and this sub-display time interval number is identical with this ash exponent number.
6. the driving method of liquid crystal indicator as claimed in claim 1, it is characterized in that: these a plurality of sub-display time intervals comprise a black plug period.
7. the driving method of liquid crystal indicator as claimed in claim 6, it is characterized in that: this liquid crystal pixel was closed all the time in this black plug period.
8. the driving method of liquid crystal indicator as claimed in claim 6, it is characterized in that: this module backlight is closed in the period all the time at this black plug.
9. the driving method of liquid crystal indicator as claimed in claim 1 is characterized in that: this liquid crystal pixel employing surface-stable ferroelectric liquid crystals.
10. the driving method of liquid crystal indicator as claimed in claim 1 is characterized in that: this picture display time interval is for showing delegation or used time of a row pixel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510100353XA CN100498911C (en) | 2005-10-14 | 2005-10-14 | Driving method for liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510100353XA CN100498911C (en) | 2005-10-14 | 2005-10-14 | Driving method for liquid crystal display |
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| Publication Number | Publication Date |
|---|---|
| CN1949347A true CN1949347A (en) | 2007-04-18 |
| CN100498911C CN100498911C (en) | 2009-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510100353XA Expired - Fee Related CN100498911C (en) | 2005-10-14 | 2005-10-14 | Driving method for liquid crystal display |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359123B (en) * | 2007-07-31 | 2012-02-01 | 奇美电子股份有限公司 | Backlight module, liquid crystal display and control method thereof |
| CN102449685A (en) * | 2009-06-10 | 2012-05-09 | 索尼公司 | Image display device, image display observing system, image display method, and program |
| CN102804257A (en) * | 2009-06-16 | 2012-11-28 | 索尼公司 | Image display device, image display method, and program |
| CN102830521A (en) * | 2012-09-14 | 2012-12-19 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN104423104A (en) * | 2013-09-06 | 2015-03-18 | 三星显示有限公司 | Liquid crystal display device |
| CN107145009A (en) * | 2017-07-18 | 2017-09-08 | 京东方科技集团股份有限公司 | A kind of down straight aphototropism mode set and its driving method, liquid crystal display device |
| CN109946880A (en) * | 2019-04-09 | 2019-06-28 | 深圳康佳电子科技有限公司 | A kind of Mini-LED backlight liquid crystal mould group, display methods and TV |
| CN111028810A (en) * | 2019-12-25 | 2020-04-17 | 上海天马微电子有限公司 | Display method of display device |
| CN113077762A (en) * | 2021-03-17 | 2021-07-06 | Tcl华星光电技术有限公司 | Driving method and driving circuit of Mini LED backlight module and display device |
-
2005
- 2005-10-14 CN CNB200510100353XA patent/CN100498911C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359123B (en) * | 2007-07-31 | 2012-02-01 | 奇美电子股份有限公司 | Backlight module, liquid crystal display and control method thereof |
| CN102449685A (en) * | 2009-06-10 | 2012-05-09 | 索尼公司 | Image display device, image display observing system, image display method, and program |
| CN102804257A (en) * | 2009-06-16 | 2012-11-28 | 索尼公司 | Image display device, image display method, and program |
| CN102830521A (en) * | 2012-09-14 | 2012-12-19 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN102830521B (en) * | 2012-09-14 | 2015-07-15 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN104423104A (en) * | 2013-09-06 | 2015-03-18 | 三星显示有限公司 | Liquid crystal display device |
| CN107145009A (en) * | 2017-07-18 | 2017-09-08 | 京东方科技集团股份有限公司 | A kind of down straight aphototropism mode set and its driving method, liquid crystal display device |
| CN109946880A (en) * | 2019-04-09 | 2019-06-28 | 深圳康佳电子科技有限公司 | A kind of Mini-LED backlight liquid crystal mould group, display methods and TV |
| CN111028810A (en) * | 2019-12-25 | 2020-04-17 | 上海天马微电子有限公司 | Display method of display device |
| CN111028810B (en) * | 2019-12-25 | 2021-08-24 | 上海天马微电子有限公司 | Display method of display device |
| CN113077762A (en) * | 2021-03-17 | 2021-07-06 | Tcl华星光电技术有限公司 | Driving method and driving circuit of Mini LED backlight module and display device |
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