CN102867496A - Public electrode voltage compensation circuit, array substrate and display - Google Patents
Public electrode voltage compensation circuit, array substrate and display Download PDFInfo
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- CN102867496A CN102867496A CN2012103582838A CN201210358283A CN102867496A CN 102867496 A CN102867496 A CN 102867496A CN 2012103582838 A CN2012103582838 A CN 2012103582838A CN 201210358283 A CN201210358283 A CN 201210358283A CN 102867496 A CN102867496 A CN 102867496A
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Abstract
The invention discloses a public electrode voltage compensation circuit, an array substrate and a display and relates to the technical field of liquid crystal displays. Automatic compensative regulation of public electrode voltage is achieved, manual regulation is not required, and accordingly man hour is reduced. The public electrode voltage compensation circuit comprises a deviation calculation unit and a voltage compensation unit. The deviation calculation unit is connected with a grid line, a data line and a pixel electrode and is used for calculating a deviation value of voltage of the data line minus voltage of the pixel electrode when the grid line outputs a closing signal. The voltage compensation unit is used for using preset public electrode voltage to minus the deviation value to acquire compensated public electrode voltage. The array substrate comprises the public electrode voltage compensation circuit, the grid line, the data line and the pixel electrode, wherein the grid line, the data line and the pixel electrode are connected to the public electrode voltage compensation circuit. The display comprises the array substrate.
Description
Technical field
The present invention relates to the LCD Technology field, relate in particular to a kind of common electrode voltage compensation circuit, array base palte and display device.
Background technology
Liquid crystal display is to control the liquid crystal anglec of rotation by the voltage difference between public electrode and the pixel electrode, pixel electrode voltage is to be provided by the AC signal that data line provides, yet, because the impact of stray capacitance on the array base palte, so that actual pixel electrode voltage is less than data line voltage, as shown in Figure 1, it is the moment of shutdown signal at grid voltage Vgate, produce the deviate Δ Vp between actual pixels electrode voltage Vpixel and the data line voltage Vdata, so that the AC signal maximal value of actual pixels electrode voltage and minimum value are different from absolute voltage difference between the default public electrode voltages Vcom ', cause the angle of liquid crystal rotation different, thereby produce flicker, namely flicker is bad.
In the manufacture process of liquid crystal display, owing to technique existence fluctuation, cause the deviate Δ Vp on the different panels different, therefore need to manually regulate respectively the generation of avoiding flicker bad to each panel, thereby caused the increase of production hour, had a strong impact on production capacity.
Summary of the invention
Embodiments of the invention provide a kind of common electrode voltage compensation circuit, array base palte and display device, realize automatically public electrode voltages being compensated adjusting, need not manually to regulate, thereby have reduced man-hour.
For solving the problems of the technologies described above, embodiments of the invention adopt following technical scheme:
A kind of common electrode voltage compensation circuit comprises:
Be connected in the deviation computing unit of grid line, data line and pixel electrode, be used for when described grid line output shutdown signal, calculating described data line voltage and deduct the deviate that described pixel electrode voltage obtains;
Voltage compensation unit, the public electrode voltages that is used for presetting deducts the public electrode voltages after described deviate is compensated.
Described deviation computing unit comprises:
Be connected in the A/D converter of described data line and pixel electrode, be used for described data line voltage and described pixel electrode voltage are converted into digital signal by simulating signal;
Be connected in the subtracter of described A/D converter, be used for calculating described data line voltage and the pixel electrode voltage that is converted into after the digital signal and subtract each other the deviate that obtains;
Be connected in the trigger of described grid line, subtracter and A/D converter, be used for when described grid line output shutdown signal, triggering described A/D converter and subtracter work;
Described voltage compensation unit comprises the public electrode voltages register, and the public electrode voltages that is used for presetting deducts the public electrode voltages after described deviate is compensated.
A kind of array base palte comprises:
Above-mentioned common electrode voltage compensation circuit;
Be connected in grid line, data line and the pixel electrode of described common electrode voltage compensation circuit.
Described pixel electrode is the pixel electrode in the middle of the first row.
A kind of display device comprises above-mentioned array base palte.
Common electrode voltage compensation circuit, array base palte and display device in the embodiment of the invention, come the deviate of computational data line voltage and actual pixels electrode voltage by the deviation computing unit, and public electrode voltages is compensated by voltage compensation unit according to this deviate, realize automatically public electrode voltages being compensated adjusting, compare with manually each panel being regulated respectively in the prior art, need not manually to regulate, thereby reduced man-hour, improved production capacity.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is for producing the waveform schematic diagram of deviate Δ Vp;
Fig. 2 is the schematic diagram of a kind of common electrode voltage compensation circuit in the embodiment of the invention;
Fig. 3 is the schematic diagram of another kind of common electrode voltage compensation circuit in the embodiment of the invention;
Fig. 4 is the structural representation of a kind of array base palte in the embodiment of the invention.
Description of reference numerals:
1-deviation computing unit; The 11-A/D converter; The 12-subtracter; The 13-trigger; The 2-voltage compensation unit; 21-public electrode voltages register; 3-common electrode voltage compensation circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
As shown in Figure 2, the embodiment of the invention provides a kind of common electrode voltage compensation circuit, comprising:
Be connected in the deviation computing unit 1 of grid line gate, data line data and pixel electrode pixel, deduct the deviate Δ Vp that pixel electrode voltage Vpixel obtains for computational data line voltage Vdata when grid line gate exports shutdown signal;
Particularly, grid line gate, data line data and pixel electrode pixel are connected to grid, source electrode and the drain electrode of thin film transistor (TFT) TFT.
Below specify common electrode voltage compensation circuit in the present embodiment as an example of the Compensation Regulation method of public electrode voltages example.
For example default public electrode voltages Vcom ' is 4v, data line voltage Vdata is the AC signal of 2～6v, the absolute voltage difference of liquid crystal rotation this moment should for | 4-2|=2v and | 6-4|=2v, but because the impact of stray capacitance, produce the deviate Δ Vp between actual pixels electrode voltage Vpixel and the data line voltage Vdata, Δ Vp is 1v, therefore actual pixels electrode voltage Vpixel is 1～5v, when the AC signal minimum value of actual pixels electrode voltage and maximal value, the absolute voltage difference of actual liquid crystal rotation is respectively | 4-1|=3v and | 5-4|=1v, thus it is bad to produce flicker.The compensation method of the present embodiment deducts the deviate Δ Vp that pixel electrode voltage Vpixel obtains by deviation computing unit computational data line voltage Vdata when grid line gate exports shutdown signal, Δ Vp=Vdata-Vpixel=6-5=2-1=1v, voltage compensation unit is connected in public electrode, the default public electrode voltages Vcom that can obtain to store, deduct public electrode voltages Vcom after deviate Δ Vp is compensated, Vcom=Vcom '-Δ Vp=4-1=3v by voltage compensation unit with default public electrode voltages Vcom '.Behind the public electrode voltages Vcom after the output compensation, the absolute voltage difference of actual liquid crystal rotation is | 3-1|=|5-3|=2v, thus avoided the bad generation of flicker.
Need to prove, owing to determining that the capacitance of electric capacity under different GTGs of deviate Δ Vp is different, therefore be preferably the Compensation Regulation of under flicker pattern, carrying out above-mentioned public electrode voltages.
Common electrode voltage compensation circuit in the embodiment of the invention, come the deviate of computational data line voltage and actual pixels electrode voltage by the deviation computing unit, and public electrode voltages is compensated by voltage compensation unit according to this deviate, realize automatically public electrode voltages being compensated adjusting, compare with manually each panel being regulated respectively in the prior art, need not manually to regulate, thereby reduced man-hour, improved production capacity.
As shown in Figure 3, particularly, the deviation computing unit comprises:
Be connected in the A/D converter 11 of data line data and pixel electrode pixel, be used for data line voltage Vdata and pixel electrode voltage Vpixel are converted into digital signal by simulating signal;
Particularly, wire and data line data between pixel electrode pixel and the A/D converter 11 are produced on the same layer, and are connected in pixel electrode pixel by via hole.
Be connected in the subtracter 12 of A/D converter 11, be used for calculate the data line voltage Vdata and the pixel electrode voltage Vpixel that are converted into after the digital signal and subtract each other the deviate Δ Vp that obtains;
Be connected in the trigger 13 of grid line gate, subtracter 12 and A/D converter 11, be used for when grid line gate output shutdown signal, triggering A/D converter 11 and subtracter 12 work;
Because TFT is generally high level and opens, this moment, 13 on trigger was the negative edge trigger.Particularly, as shown in Figure 1, because grid line gate output signal becomes low level by high level, namely above-mentioned TFT turn-offs and can produce above-mentioned deviate Δ Vp when making, and therefore triggers A/D converter 11 collection signals and subtracter 12 calculation deviation value Δ Vp when grid line gate output shutdown signal.
Voltage compensation unit comprises public electrode voltages register 21, and the public electrode voltages Vcom ' that is used for presetting deducts the public electrode voltages Vcom after deviate Δ Vp is compensated.Store default public electrode voltages in the public electrode voltages register 21, and be connected in public electrode, therefore namely may be output to public electrode behind the public electrode voltages Vcom after being compensated, regulate with the output that realizes public electrode voltages Vcom value, thereby avoided the bad generation of flicker.
Above-mentioned A/D converter 11, subtracter 12, trigger 13 and public electrode voltages register 21 can be integrated on the drive IC of existing array base palte.
Common electrode voltage compensation circuit in the embodiment of the invention, come the deviate of computational data line voltage and actual pixels electrode voltage by the deviation computing unit, and public electrode voltages is compensated by voltage compensation unit according to this deviate, realize automatically public electrode voltages being compensated adjusting, compare with manually each panel being regulated respectively in the prior art, need not manually to regulate, thereby reduced man-hour, improved production capacity.
Further, as shown in Figure 4, the embodiment of the invention also provides a kind of array base palte, comprises by several pixel electrodes of number row grid line and the definition of ordered series of numbers data line intersection, also comprises: above-mentioned common electrode voltage compensation circuit 3; Common electrode voltage compensation circuit 3 is connected in grid line gate, data line data and pixel electrode pixel wherein; Grid line gate and data line data are connected in pixel electrode pixel by thin film transistor (TFT) TFT.Grid line gate, data line data and pixel electrode pixel are connected to grid, source electrode and the drain electrode of thin film transistor (TFT) TFT.
Further, pixel electrode pixel is preferably the middle pixel electrode of the first row.Because the wiring of this part is relatively loose, but and be positioned at the edge of viewing area, but and common electrode voltage compensation circuit 3 is preferably and is produced on outside the viewing area, and the line between this pixel electrode is convenient.Connecting line between common electrode voltage compensation circuit 3 and the grid line gate can be made at same layer with grid line, and the connecting line between common electrode voltage compensation circuit 3 and data line data and the pixel electrode pixel can be made at same layer with data line.
The Compensation Regulation method of the structure of common electrode voltage compensation circuit and public electrode voltages is same as the previously described embodiments particularly, does not repeat them here.
Array base palte in the embodiment of the invention, come the deviate of computational data line voltage and actual pixels electrode voltage by the deviation computing unit in the common electrode voltage compensation circuit, and public electrode voltages is compensated by voltage compensation unit according to this deviate, realize automatically public electrode voltages being compensated adjusting, compare with manually each panel being regulated respectively in the prior art, need not manually to regulate, thereby reduced man-hour, improved production capacity.
The embodiment of the invention also provides a kind of display device, comprises above-mentioned array base palte.
Array base-plate structure is same as the previously described embodiments particularly, does not repeat them here.
Display device in the embodiment of the invention, come the deviate of computational data line voltage and actual pixels electrode voltage by the deviation computing unit in the common electrode voltage compensation circuit on the array base palte, and public electrode voltages is compensated by voltage compensation unit according to this deviate, realize automatically public electrode voltages being compensated adjusting, compare with manually each panel being regulated respectively in the prior art, need not manually to regulate, thereby reduced man-hour, improved production capacity.
Through the above description of the embodiments, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware, can certainly pass through hardware, but the former is better embodiment in a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium that can read, floppy disk such as computing machine, hard disk or CD etc., comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; be the specific embodiment of the present invention only, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (5)
1. a common electrode voltage compensation circuit is characterized in that, comprising:
Be connected in the deviation computing unit of grid line, data line and pixel electrode, be used for when described grid line output shutdown signal, calculating described data line voltage and deduct the deviate that described pixel electrode voltage obtains;
Voltage compensation unit, the public electrode voltages that is used for presetting deducts the public electrode voltages after described deviate is compensated.
2. common electrode voltage compensation circuit according to claim 1 is characterized in that,
Described deviation computing unit comprises:
Be connected in the A/D converter of described data line and pixel electrode, be used for described data line voltage and described pixel electrode voltage are converted into digital signal by simulating signal;
Be connected in the subtracter of described A/D converter, be used for calculating described data line voltage and the pixel electrode voltage that is converted into after the digital signal and subtract each other the deviate that obtains;
Be connected in the trigger of described grid line, subtracter and A/D converter, be used for when described grid line output shutdown signal, triggering described A/D converter and subtracter work;
Described voltage compensation unit comprises the public electrode voltages register, and the public electrode voltages that is used for presetting deducts the public electrode voltages after described deviate is compensated.
3. an array base palte is characterized in that, comprising:
Common electrode voltage compensation circuit as claimed in claim 1 or 2;
Be connected in grid line, data line and the pixel electrode of described common electrode voltage compensation circuit.
4. array base palte according to claim 3 is characterized in that,
Described pixel electrode is the pixel electrode in the middle of the first row.
5. a display device is characterized in that, comprises such as claim 3 or 4 described array base paltes.
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| CN105469767A (en) * | 2016-01-05 | 2016-04-06 | 京东方科技集团股份有限公司 | Common voltage compensation circuit, compensation method, display panel and display device |
| CN105913824A (en) * | 2016-06-30 | 2016-08-31 | 京东方科技集团股份有限公司 | Common electrode control method, common electrode control circuit and display device |
| WO2017133042A1 (en) * | 2016-02-01 | 2017-08-10 | 深圳市华星光电技术有限公司 | Method for driving liquid crystal display panel |
| CN108269544A (en) * | 2018-01-31 | 2018-07-10 | 京东方科技集团股份有限公司 | Flicker drift optimization circuit and display panel, display device |
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| CN105913824B (en) * | 2016-06-30 | 2019-02-12 | 京东方科技集团股份有限公司 | Public electrode control method and circuit, display device |
| CN108269544A (en) * | 2018-01-31 | 2018-07-10 | 京东方科技集团股份有限公司 | Flicker drift optimization circuit and display panel, display device |
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| CN102867496B (en) | 2014-07-30 |
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Owner name: JINGDONGFANG SCIENCE AND TECHNOLOGY GROUP CO., LTD Free format text: FORMER OWNER: BEIJING BOE PHOTOELECTRICITY SCIENCE + TECHNOLOGY CO., LTD. Effective date: 20141205 Owner name: BEIJING BOE PHOTOELECTRICITY SCIENCE + TECHNOLOGY Effective date: 20141205 |
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Effective date of registration: 20141205 Address after: 100015 Jiuxianqiao Road, Beijing, No. 10, No. Patentee after: BOE Technology Group Co., Ltd. Patentee after: Beijing BOE Photoelectricity Science & Technology Co., Ltd. Address before: 100176 Beijing economic and Technological Development Zone, West Central Road, No. 8 Patentee before: Beijing BOE Photoelectricity Science & Technology Co., Ltd. |