CN106847226B - The best method for adjusting common voltage of 3T pixel - Google Patents
The best method for adjusting common voltage of 3T pixel Download PDFInfo
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- CN106847226B CN106847226B CN201710241084.1A CN201710241084A CN106847226B CN 106847226 B CN106847226 B CN 106847226B CN 201710241084 A CN201710241084 A CN 201710241084A CN 106847226 B CN106847226 B CN 106847226B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
Abstract
The present invention provides a kind of best method for adjusting common voltage of 3T pixel.The best method for adjusting common voltage of 3T pixel includes: step 10, adjustment primary area, keeps its feed-trough voltage as small as possible, primary area common voltage is made to be in a high position；Step 20 adjusts time area, keeps its feed-trough voltage as small as possible, and the area Shi Ci common voltage is in a high position；Step 30, adjustment public electrode current potential, the best common voltage in the area Shi Ci are promoted；Step 40 is gradually increased primary area feed-trough voltage, declines primary area common voltage, finally makes primary area consistent with time common voltage in area.The best method for adjusting common voltage of 3T pixel of the present invention, which is easy to the best common voltage balance in adjustment primary area and secondary area, improves crosstalk phenomenon so that the common voltage of entire panel is consistent.
Description
Technical field
The present invention relates to field of liquid crystal more particularly to a kind of best method for adjusting common voltage of 3T pixel.
Background technique
Liquid crystal display panel usually by colored filter substrate, thin-film transistor array base-plate and is configured between two substrates
Liquid crystal layer constituted, and respectively two substrates relative inner be arranged pixel electrode, public electrode, pass through apply voltage control
Liquid crystal molecule changes direction, and the light refraction of backlight module is come out and generates picture.Liquid crystal display includes twisted-nematic (TN)
The plurality of display modes such as mode, birefringent (ECB) mode of electronic control, vertical orientation (VA), wherein VA mode is that one kind has
High contrast, wide viewing angle, the common display pattern without advantages such as friction matchings.But since VA mode is using the liquid vertically rotated
The diversity ratio of crystalline substance, liquid crystal molecule birefringence is larger, causes colour cast (color shift) problem under big visual angle than more serious.
With the development of LCD technology, show that the size of screen is increasing, conventionally employed 4domain (4 farmland)
PSVA (polymer stabilizing vertical orientation) pixel can highlight the bad performance of visual angle colour cast.In order to promote the performance of panel visual angle, 3T_
The PSVA pixel of 8domain (8 farmland, 3 transistor) is gradually applied to the design of large size TV panel, makes the same sub-pixel
4 farmlands in main area (main) and the rotational angle of the liquid crystal molecule on 4 farmlands in time area (sub) are different in (sub pixel), from
And improve colour cast.As shown in Figure 1, it is the circuit diagram of existing 3T dot structure.Multiple sub- pictures in liquid crystal display panel
Element is arranged in array, and each sub-pixel can be divided into main area (main) Qu Heci (sub), including primary area thin film transistor (TFT) TFT_m,
Primary area liquid crystal capacitance Clc_m, primary area storage capacitance Cst_m, secondary area's thin film transistor (TFT) TFT_s, secondary area's liquid crystal capacitance Clc_s are secondary
A scanning is respectively set in area storage capacitance Cst_s and shared thin film transistor (TFT) TFT_share, corresponding every a line sub-pixel
A data line Data is respectively set in line Gate, corresponding each column sub-pixel；The grid connection of primary area thin film transistor (TFT) TFT_m is swept
Line Gate is retouched, source/drain connects data line Data, between its drain/source and public electrode A_com (or C_com)
It is connected in parallel primary area liquid crystal capacitance Clc_m and primary area storage capacitance Cst_m；The grid connection of secondary area's thin film transistor (TFT) TFT_s is swept
Line Gate is retouched, source/drain connects data line Data, between its drain/source and public electrode A_com (or C_com)
It is connected in parallel time area liquid crystal capacitance Clc_s and time area storage capacitance Cst_s；The grid of shared thin film transistor (TFT) TFT_share connects
Scan line Gate is met, source electrode and drain electrode is separately connected the drain/source and public electrode A_ of secondary area's thin film transistor (TFT) TFT_s
com.It will be understood by those skilled in the art that although public electrode A_com and C_com title is different, in practical liquid crystal surface
Usually current potential is identical both in plate, can only be indicated with public electrode A_com；For thin film transistor (TFT), due to its source electrode and
The characteristic of drain electrode is the same, therefore its source electrode and drain electrode is not particularly limited in circuit；In the solid of liquid crystal display panel
In structure, the two poles of the earth of liquid crystal capacitance and storage capacitance usually respectively correspond pixel electrode and (or identical with pixel electrode current potential deposit
Storage pole) and public electrode.
And as panel refresh frequency is continuously improved, primary area and time best common voltage in area (best Vcom) debugging are
One inevitable problem flashes (Flicker) phenomenon to improve.Best common voltage is public electrode needed for pixel
(com) voltage can have crosstalk (cross_talk) and image retention when the best common voltage in primary area or secondary area is different
(IS) the problems such as (issue).And the public electrode A_com of pixel is because be connected directly with sub-pixel, common electrical
The current potential of pole A_com directly affects common voltage (Vcom) performance of sub-pixel.
Image residue generate the main reason for be due to the thin film transistor (TFT) in liquid crystal display drive circuit (as shown in figure 1
TFT_s) there are parasitic capacitance (Cgs).During the display of liquid crystal display, when the voltage of scan line conveying changes
When, feedthrough (Feed Through) voltage Vft will be generated on parasitic capacitance Cgs, when this makes data line carry out polarity reversion
It cannot be that intermediate value carries out symmetrically, and then generates direct current residual effect with common voltage (Vcom).In the influence of direct current residual effect
Under, if keeping liquid crystal for a long time, polar plate voltage size is constant up and down, and remaining removable ion is in same direction in liquid crystal molecule
It is easily collected on the same side of molecule in electric field, internal electric field is formed, when the picture of liquid crystal display is switched to low ash by high gray
When rank, the electric field of the internal electric field and bottom crown on liquid crystal is cancelled out each other, so that liquid crystal is unable to reach expected deflection angle, finally
Generate image retention.
In actual application, flashing (Flicker) value of the display picture of liquid crystal display can be used as measurement and work as
The preceding whether serious standard of direct current residual effect.The reason is that the positive and negative pole tension of exchange driving and the pressure difference of public electrode voltages
When unequal namely generation direct current residual effect, if data line carries out polarity reversion, picture brightness is changed in turn
So that film flicker, wherein the size of film flicker degree depends on the size of flicker value, therefore, it can be deduced that flicker value is got over
The more serious conclusion of big direct current residual effect.In order to reduce direct current residual effect and then reduce image retention, it will usually logical
The flicker value of liquid crystal display while crossing adjustment common voltage under monitoring specific grey-scale voltage, when flicker value minimum, this
When common voltage be identified as best common voltage, direct current residual effect at this time is minimum.
Existing feed-trough voltage calculation formula (1) is as follows:
Wherein, Vft is feed-trough voltage, and Cgs is parasitic capacitance,
Cst is storage capacitance, and Clc is liquid crystal capacitance, and Vpp is scanning voltage, i.e., scan line open and close thin film transistor (TFT) when electricity
Pressure difference.
Referring to fig. 2, the schematic diagram of common voltage Vcom is influenced for feed-trough voltage Vft.In Fig. 2, Vcom is common voltage,
Vp is the voltage that data line is applied to pixel electrode.Due to the influence of feed-trough voltage Vft, Vp, which deviates, becomes V+ or V-.From Fig. 2
In it can also be seen that Vft (red sub-pixel R) > Vft (green sub-pixels), this is because the parasitic capacitance of different colours sub-pixel
Caused by Cgs is different.
Fig. 3 is the schematic diagram of the best common voltage in different public electrode A_com current potentials area's next time, and horizontal axis indicates public electrode
A_com current potential, the longitudinal axis indicate best common voltage.Illustrating public electrode A_com current potential size influences time best common electrical in area
The best common voltage value of the analog result trend of pressure and secondary area is positively correlated as the value of public electrode A_com current potential is presented
Property.
Summary of the invention
Therefore, the purpose of the present invention is to provide a kind of best method for adjusting common voltage of 3T pixel, in order to adjust master
The best common voltage balance in area and secondary area.
To achieve the above object, the present invention provides a kind of best method for adjusting common voltage of 3T pixel, the 3T pixels
Each sub-pixel be divided into primary area and time area, including primary area thin film transistor (TFT), primary area liquid crystal capacitance, primary area storage capacitance, secondary area
Thin film transistor (TFT), secondary area's liquid crystal capacitance, secondary area's storage capacitance and shared thin film transistor (TFT), comprising:
Step 10, adjustment primary area, make its feed-trough voltage become smaller as far as possible, primary area common voltage are made to become larger in opposite height
Position；
Step 20 adjusts time area, so that its feed-trough voltage is become smaller as far as possible, the area Shi Ci common voltage becomes larger in opposite height
Position；
Step 30, adjustment public electrode current potential, the area Shi Ci common voltage are promoted；
Step 40 is gradually increased primary area feed-trough voltage, declines primary area common voltage, finally makes the public of primary area and time area
Voltage is consistent.
Wherein, primary area feed-trough voltage is adjusted by adjusting primary area parasitic capacitance in step 10.
Wherein, primary area feed-trough voltage is adjusted by adjusting primary area storage capacitance in step 10.
Wherein, primary area feed-trough voltage is adjusted by adjusting scanning signal delay in step 10.
Wherein, primary area feed-trough voltage is adjusted by adjusting secondary area's parasitic capacitance in step 20.
Wherein, primary area feed-trough voltage is adjusted by adjusting secondary area's storage capacitance in step 20.
Wherein, feed-trough voltage is adjusted according to the following formula:
Wherein, Vft is feed-trough voltage, and Cgs is parasitic electricity
Hold, Cst is storage capacitance, and Clc is liquid crystal capacitance, and Vpp is scanning voltage.
Wherein, the pixel is PSVA pixel.
To sum up, the best method for adjusting common voltage of 3T pixel of the present invention is easy to adjustment primary area and the best common voltage in secondary area
Balance improves crosstalk phenomenon so that the common voltage of entire panel is consistent.
Detailed description of the invention
With reference to the accompanying drawing, by the way that detailed description of specific embodiments of the present invention, technical solution of the present invention will be made
And other beneficial effects are apparent.
In attached drawing,
Fig. 1 is the circuit diagram of existing 3T dot structure；
Fig. 2 is the schematic diagram that feed-trough voltage Vft influences common voltage Vcom；
Fig. 3 is the schematic diagram of the best common voltage in different public electrode A_com current potentials area's next time；
Fig. 4 is the schematic illustration of the best method for adjusting common voltage of 3T pixel of the present invention；
Fig. 5 is the flow chart of the best method for adjusting common voltage of 3T pixel of the present invention.
Specific embodiment
It is the flow chart of the best method for adjusting common voltage of 3T pixel of the present invention referring to Fig. 5.Each of described 3T pixel
Sub-pixel is divided into primary area and time area, including primary area thin film transistor (TFT), primary area liquid crystal capacitance, primary area storage capacitance, secondary area's film crystalline substance
Body pipe, secondary area's liquid crystal capacitance, secondary area's storage capacitance and shared thin film transistor (TFT), this method specifically include that
Step 10, adjustment primary area, make its feed-trough voltage become smaller as far as possible, primary area common voltage are made to become larger in opposite height
Position；
Step 20 adjusts time area, so that its feed-trough voltage is become smaller as far as possible, the area Shi Ci common voltage becomes larger in opposite height
Position；
Step 30, adjustment public electrode current potential, the area Shi Ci common voltage are promoted；
Step 40 is gradually increased primary area feed-trough voltage, declines primary area common voltage, finally makes the public of primary area and time area
Voltage is consistent.
The present invention can adjust the common voltage in primary area and secondary area according to aforesaid voltage formula (1), so that entire panel
Common voltage it is consistent, improve crosstalk phenomenon.
Fig. 4 is the schematic illustration of the best method for adjusting common voltage of 3T pixel of the present invention, further in conjunction with Fig. 4 and Fig. 5
It illustrates the present invention.
Primary area is adjusted first, can reduce Cgs, is increased Cst, is kept its Vft as small as possible, primary area common voltage demand is in
High-value.
Time area is adjusted, can reduce Cgs, increases Cst, keeps its Vft as small as possible, promotes time area's common voltage value.
By adjusting public electrode A_com current potential, the area Shi Ci common voltage is promoted.
It is gradually increased primary area Vft, declines its common voltage, final primary area and time area are subequal flat in one
Weighing apparatus value.It can reduce Cst by increasing primary area Cgs, adjust scanning signal delay (Gate delay) etc. modes to increase primary area
Vft declines primary area common voltage Vcom from a high position, and according to maximum (max), the trend of average (Avg) to minimum (min) becomes
Change, it is consistent with time area up to being changed to, keep primary area consistent with time best common voltage in area.
The best method for adjusting common voltage of 3T pixel of the present invention is easy to the best common voltage balance in adjustment primary area and secondary area,
So that the common voltage of entire panel is consistent, improve crosstalk phenomenon.
The above for those of ordinary skill in the art can according to the technique and scheme of the present invention and technology
Other various corresponding changes and modifications are made in design, and all these change and modification all should belong to the appended right of the present invention
It is required that protection scope.
Claims (8)
1. a kind of best method for adjusting common voltage of 3T pixel, each sub-pixel of the 3T pixel is divided into primary area and time area, packet
Primary area thin film transistor (TFT) is included, primary area liquid crystal capacitance, primary area storage capacitance, secondary area's thin film transistor (TFT), secondary area's liquid crystal capacitance, secondary area deposits
Storage holds and shared thin film transistor (TFT) characterized by comprising
Step 10, adjustment primary area, make its feed-trough voltage become smaller as far as possible, primary area common voltage are made to become larger in an opposite high position；
Step 20 adjusts time area, so that its feed-trough voltage is become smaller as far as possible, the area Shi Ci common voltage becomes larger in an opposite high position；
Step 30, adjustment public electrode current potential, the area Shi Ci common voltage are promoted；
Step 40 is gradually increased primary area feed-trough voltage, declines primary area common voltage, finally makes the common voltage in primary area and time area
Unanimously.
2. the best method for adjusting common voltage of 3T pixel as described in claim 1, which is characterized in that in step 10 by adjusting
Primary area parasitic capacitance adjusts primary area feed-trough voltage.
3. the best method for adjusting common voltage of 3T pixel as described in claim 1, which is characterized in that in step 10 by adjusting
Primary area storage capacitance adjusts primary area feed-trough voltage.
4. the best method for adjusting common voltage of 3T pixel as described in claim 1, which is characterized in that in step 10 by adjusting
Scanning signal delay adjusts primary area feed-trough voltage.
5. the best method for adjusting common voltage of 3T pixel as described in claim 1, which is characterized in that in step 20 by adjusting
Secondary area's parasitic capacitance adjusts time area's feed-trough voltage.
6. the best method for adjusting common voltage of 3T pixel as described in claim 1, which is characterized in that in step 20 by adjusting
Secondary area's storage capacitance adjusts time area's feed-trough voltage.
7. the best method for adjusting common voltage of 3T pixel as described in claim 1, which is characterized in that adjust according to the following formula
Feed-trough voltage:
, wherein Vft is feed-trough voltage, and Cgs is parasitic capacitance, Cst
For storage capacitance, Clc is liquid crystal capacitance, and Vpp is scanning voltage.
8. the best method for adjusting common voltage of 3T pixel as described in claim 1, which is characterized in that the pixel is PSVA picture
Element.
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| CN107464540B (en) | 2017-09-26 | 2020-03-27 | 京东方科技集团股份有限公司 | Liquid crystal display, display panel and VCOM voltage control method and device thereof |
| CN107783345A (en) * | 2017-10-30 | 2018-03-09 | 深圳市华星光电半导体显示技术有限公司 | Dot structure circuit and liquid crystal display circuit |
| CN109509448B (en) * | 2018-12-19 | 2021-03-16 | 惠科股份有限公司 | Method and device for eliminating shutdown ghost on panel |
| CN110111753B (en) * | 2019-04-10 | 2020-10-27 | 深圳市华星光电半导体显示技术有限公司 | Driving method and device of display panel |
| CN111665988B (en) * | 2020-06-08 | 2023-08-18 | 京东方科技集团股份有限公司 | Method for improving optical performance of display screen, touch display panel and display device |
| CN114299891B (en) * | 2021-12-23 | 2023-04-25 | 长沙惠科光电有限公司 | Display panel driving method, driver and display device |
| CN114387937B (en) * | 2022-02-17 | 2023-05-02 | 深圳市华星光电半导体显示技术有限公司 | Pixel structure and display panel |
| CN115035868B (en) * | 2022-05-26 | 2023-05-30 | Tcl华星光电技术有限公司 | Control method of display panel and display module |
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| TW588183B (en) * | 2002-06-07 | 2004-05-21 | Hannstar Display Corp | A method and an apparatus for decreasing flicker of a liquid crystal display |
| TWI409791B (en) * | 2010-02-25 | 2013-09-21 | Chunghwa Picture Tubes Ltd | Multi-domain pixel driving circuit and method of the same |
| CN101866604B (en) * | 2010-03-19 | 2012-08-22 | 华映视讯（吴江）有限公司 | Multi-partition pixel drive circuit and method thereof |
| CN103558692A (en) * | 2013-10-12 | 2014-02-05 | 深圳市华星光电技术有限公司 | Polarizing type three-dimensional display panel and pixel units of polarizing type three-dimensional display panel |
| CN105529008B (en) * | 2016-02-01 | 2018-03-30 | 深圳市华星光电技术有限公司 | The driving method of liquid crystal display panel |
| CN106249498B (en) * | 2016-10-18 | 2019-07-16 | 深圳市华星光电技术有限公司 | A kind of dot structure and liquid crystal display panel |
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Effective date of registration: 20171026 Address after: 518132 No. 9-2 Ming Avenue, Gongming street, Guangming District, Guangdong, Shenzhen Applicant after: Shenzhen Huaxing photoelectric semiconductor display technology Co., Ltd. Address before: 518132 9-2, Guangming Road, Guangming New District, Guangdong, Shenzhen Applicant before: Shenzhen Huaxing Optoelectronic Technology Co., Ltd. |
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