CN106023927A - Method of correcting Gamma voltages and white dots of replacement RGBW panel - Google Patents
Method of correcting Gamma voltages and white dots of replacement RGBW panel Download PDFInfo
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- CN106023927A CN106023927A CN201610562357.8A CN201610562357A CN106023927A CN 106023927 A CN106023927 A CN 106023927A CN 201610562357 A CN201610562357 A CN 201610562357A CN 106023927 A CN106023927 A CN 106023927A
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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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention relates to a method of correcting Gamma voltages and white dots of a replacement RGBW panel. The method of correcting Gamma voltages and white dots of a replacement RGBW panel comprises the steps as follows: S10, adjusting the Gamma voltage of an RGB sub-pixel on a gray scale n; S20, adjusting the Gamma voltage of a W sub pixel on the gray scale n; and S30, adjusting the RGBW digital compensation data of the W sub pixel on the gray scale n. The method of correcting Gamma voltages and white dots of a replacement RGBW panel is simple and easy to implement, makes up for the defect that color bias of a W sub pixel cannot be corrected by adjusting the Gamma voltage only in the traditional method, is suitable for adjusting a panel which is over specification due to process difference to the range of specification in production, and can reduce loss to factories.
Description
Technical field
The present invention relates to field of liquid crystal, particularly relate to a kind of Gamma voltage correcting alternative type RGBW panel and the method for white point.
Background technology
Along with development and the raising of people's quality of life of science and technology, liquid crystal display device has been seen everywhere in life, and people are more and more higher to the requirement of liquid crystal display device, starts to pursue big display picture, fast response speed and higher resolution.
In current RGB display floater, with R (red) sub-pixel, G (green) sub-pixel and B (blue) sub-pixel one pixel of composition.By controlling the grey decision-making (i.e. rgb value) of each sub-pixel, blend required color to show image.Along with people's high permeability to display floater, low-power consumption, the increase of the demand that image quality is good, occur in that by R sub-pixel, G sub-pixel, B sub-pixel and the display floater of W (white) sub-pixel one pixel of composition, be also called RGBW display floater.
AMOLED (active matrix organic light-emitting diode) large size panel usually uses the display mode of RGBW.By increasing W sub-pixel (sub-pixel), originally the white needing RGB simultaneously to light realization when showing picture can realize by the way of the brightest W sub-pixel, this prior art is usually the minima of rgb value using input as the W value of output, thus effectively reduces the power consumption of display.As it is shown in figure 1, its a kind of common RGBW display algorithm schematic diagram that is prior art, i.e. substitute (Replacement) mode.This algorithm employing classical formulas (1):
Wo=min{R, G, B}；
Ro=Ri-Wo；
Go=Gi-Wo；
Bo=Bi-Wo.
This white presented by RGB of pixel Central Plains as the W value of output, is extracted, substitutes display with W sub-pixel by this algorithm by the minima of the RGB sub-pixel value of input.The brightest W sub-pixel when RGBW shows GTG (Gray) picture; but the relation due to current processing procedure; usually can there is colour cast problem in W sub-pixel; being unable to reach correction GTG white point coordinates purpose by the way of simple adjustment Gamma voltage (gamma reference voltage), therefore tradition is no longer suitable for, with automatic gamma reference voltage (Auto Gamma) method adjusting Gamma voltage, the panel that RGBW shows.
Summary of the invention
Therefore, it is an object of the invention to propose method that is simple and that easily realize and realize the RGBW panel Gamma voltage to alternate algorithm and white point is corrected, make up traditional method and only adjust Gamma voltage and can not correct the deficiency of W sub-pixel colour cast.
For achieving the above object, the present invention provides a kind of Gamma voltage correcting alternative type RGBW panel and the method for white point, including:
Step 10, adjustment RGB sub-pixel Gamma voltage on GTG n；
Step 20, adjustment W sub-pixel Gamma voltage on GTG n；
Step 30, adjustment W sub-pixel RGBW numerical digit offset data on GTG n.
Wherein, step 10 includes: RGB sub-pixel is lighted, W sub-pixel does not works, now show white picture, by adjusting the brightness that the Gamma Voltage Cortrol RGB sub-pixel of RGB sub-pixel three shows, make GTG n brightness reach object brightness, adjust the brightness proportioning of RGB sub-pixel so that white point coordinates is in the specification of target simultaneously.
Wherein, step 20 includes: RGB sub-pixel does not works, and W sub-pixel is lighted, and now shows white picture, by adjusting the brightness that the Gamma Voltage Cortrol W sub-pixel of W sub-pixel shows so that GTG n brightness reaches object brightness.
Wherein, step 30 includes: choose specific n GTG, by adjusting the grey decision-making of RGBW sub-pixel in GTG so that the brightness of GTG and chromaticity correction, to goal standard, compensate W sub-pixel by RGB sub-pixel numerical digit, finally set up the look-up table that W sub-pixel numerical digit compensates.
Wherein, in step 10, according to G sub-pixel, B sub-pixel, the order of R sub-pixel is sequentially adjusted in corresponding Gamma voltage, and the Gamma voltage adjusting G sub-pixel is used for adjusting brightness, the Gamma voltage adjusting B sub-pixel is used for adjusting colourity, the Gamma voltage adjusting R sub-pixel is used for adjusting colourity, and the parameter adjusted the most at last all adjusts to the deviation threshold of target, if brightness and colourity cannot be adjusted to target and can realize by the way of circulation repeatedly restrains by a process simultaneously.
Wherein, step 10 use binary chop adjust Gamma voltage.
Wherein, step 30 also includes that choosing W sub-pixel numerical digit compensates type.
Wherein, according to W sub-pixel, B sub-pixel, the order of R sub-pixel makes to show that the brightness of picture and colourity meet goal standard by the way of adjusting numerical digit grey decision-making, if brightness and colourity cannot be adjusted to target and can realize by the way of circulation repeatedly restrains by a process simultaneously.
Wherein, choosing specific N number of GTG, try to achieve the numerical digit offset of this N number of specific grey-scale, the numerical digit offset of remaining GTG is tried to achieve according to this N number of specific grey-scale linear interpolation.
Wherein, the value of N is chosen according to the linear characteristic of this RGBW panel.
To sum up, the method of Gamma voltage and white point that the present invention corrects alternative type RGBW panel simply and easily realizes, make up traditional method only to adjust Gamma voltage and can not correct the deficiency of W sub-pixel colour cast, it is applicable to be adjusted to specification by the panel of the super rule degradation caused due to processing procedure difference aborning, factory's loss can be reduced.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings, by the detailed description of the invention of the present invention is described in detail, technical scheme and other beneficial effects will be made apparent.
In accompanying drawing,
Fig. 1 is a kind of common RGBW display algorithm schematic diagram of prior art；
Fig. 2 is that the present invention corrects the Gamma voltage of alternative type RGBW panel and the flow chart of the method for white point；
Fig. 3 is that the present invention corrects the flow chart correcting Gamma voltage in the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point；
Fig. 4 is that the present invention corrects the schematic diagram of binary chop adjustment Gamma voltage in the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point；
Fig. 5 is the schematic diagram that the present invention corrects that in the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point, W sub-pixel numerical digit compensation type is chosen；
Fig. 6 is that the present invention corrects Δ WRB type W sub-pixel numerical digit compensation schematic diagram in the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point；
Fig. 7 is that the present invention corrects Δ WRB type W sub-pixel numerical digit compensation flow chart in the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point；
Fig. 8 is that the present invention corrects and shows process schematic (as a example by Δ WRB type) in the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point；
Fig. 9 is that the present invention corrects compensation effect contrast schematic diagram in the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point.
Detailed description of the invention
Seeing Fig. 2, it corrects the Gamma voltage of alternative type RGBW panel and the flow chart of the method for white point for the present invention.The method is divided into two stages of analog voltage sum digit compensation adjustment, specifically includes that
Step 10, adjustment RGB sub-pixel Gamma voltage on GTG n；
Step 20, adjustment W sub-pixel Gamma voltage on GTG n；
Step 30, adjustment W sub-pixel RGBW numerical digit offset data on GTG n.
The present invention's, it is important that introduce the colour cast of the method compensation W sub-pixel that numerical digit compensates, combines with the analog form adjusting Gamma voltage, Gamma voltage and the white point coordinates of the RGBW panel of alternate algorithm is corrected to target.
For the RGBW panel (referring to Fig. 1 and formula (1)) of replacement display mode, shown in the target component such as formula (2) that panel of the present invention adjusts, the present invention presets target maximum brightness LvTWith white point coordinates (xT,yT), the target in conjunction with Gamma voltage can be calculated object brightness Lv corresponding to each GTG nTn.Owing to alternative is the white that W substitutes RGB, therefore the adjustment of RGB separates with the adjustment of W, and final target is that RGB sub-pixel showing, the gray-scale intensity shown with W sub-pixel and white point are all adjusted in goal standard.
Formula (2):
LvR+LvG+LvB=Lvw=LvT；
(x,y)RGB=(x, y)W=(xT,yT)；
The simulation gamma electric voltage metamorphosis stage:
RGB sub-pixel is lighted, and W sub-pixel does not works, and now shows white picture.By adjusting the brightness that the Gamma Voltage Cortrol RGB of RGB sub-pixel three shows so that GTG n brightness reaches object brightness, i.e. LvRn+LvGn+LvBn=LvTn.Adjust the brightness proportioning of RGB sub-pixel so that white point coordinates is at target (x simultaneouslyT,yT) specification in.
RGB sub-pixel does not works, and W sub-pixel is lighted, and now shows white picture.By adjusting the brightness that the Gamma Voltage Cortrol W sub-pixel of W sub-pixel shows so that GTG n brightness reaches object brightness, i.e. Lvwn=LvTn。
W sub-pixel colour cast numerical digit compensated stage:
Choose specific n GTG, by adjusting the grey decision-making of RGBW in GTG so that the brightness of GTG and chromaticity correction, to goal standard, i.e. compensate W sub-pixel by RGB sub-pixel numerical digit, finally set up the look-up table (LUT, Look up table) that W sub-pixel compensates.
Seeing Fig. 3, it corrects the flow chart correcting Gamma voltage in the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point for the present invention.Wherein T1 is luminance deviation threshold value, and it is currency and target Lv that T2, T3 are respectively the deviation threshold of colourity x and y, △ Lv, △ x and △ yT、xT、yTDeviation.It is sequentially adjusted in corresponding Gamma voltage according to the order of G → B → R, the Gamma voltage adjusting G is used for adjusting brightness Lv, the Gamma voltage adjusting B is used for adjusting chromaticity y, the Gamma voltage adjusting R is used for adjusting colourity x, the parameter (Lv or x or y) adjusted the most at last all adjusts to the deviation threshold of target, if brightness and colourity cannot be adjusted to target and can realize by the way of circulation repeatedly restrains by a process simultaneously.
As shown in Figure 4, during it corrects the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point for the present invention, binary chop adjusts the schematic diagram of Gamma voltage.Adjust Gamma voltage and can use binary chop, owing to the relation of parameter (Lv or x or y) Yu Gamma voltage meets monotonicity, Gamma voltage seeking scope L1～U1 can be chosen in advance, take its corresponding point midway M1, measure value of consult volume corresponding to M1, can determine whether out that target (Target) is in the interval still lower half of upper half interval, the point midway continuing to take residing half-interval repeats aforesaid operations, choose Gamma voltage seeking scope L2～U2, take its corresponding point midway M2, measure value of consult volume corresponding to M2, until the deviation of parameter and target converges in threshold value, so can realize quickly adjusting Gamma voltage makes parameter converge in targets threshold.
As it is shown in figure 5, it corrects W sub-pixel numerical digit in the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point for the present invention compensates the schematic diagram that type is chosen.Theory analysis understands, it is only necessary to two components in RGB just can realize the compensation to W color dot.As it is shown in figure 5, can draw out Δ WGB, Δ WRB, Δ WRG delta-shaped region by the respective color point coordinates of RGBW measured, which delta-shaped region is target color point be positioned at, so that it may by three vertex component synthesis target color point of corresponding triangle.Owing to necessarily there being W component in three vertex component, i.e. W component can synthesize target color point plus two components in RGB.The present invention here illustrates as a example by Δ WRB.
As shown in Figure 6, during it corrects the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point for the present invention, Δ WRB type W sub-pixel numerical digit compensates schematic diagram.Normal condition grey menu has only to light W sub-pixel, but in order to compensate the colour cast of W sub-pixel, needs to light R and B sub-pixel again.Now the Gamma voltage of RGBW has been adjusted and has been fixed, and can only change the brightness proportioning of W, R, B by adjusting the numerical digit grey decision-making of W, R, B.
As it is shown in fig. 7, it corrects Δ WRB type W sub-pixel numerical digit in the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point for the present invention compensates flow chart.Lv, x, the y showing picture is made to meet goal standard by the way of adjusting numerical digit grey decision-making according to the order of W → B → R.GTG 1～255 can be sequentially adjusted in the way of numerical digit compensation, the LUT (Look Up Table look-up table) constituting the compensation of W sub-pixel numerical digit of W, R, B GTG digit value corresponding to final GTG 1～255, as shown in table 1 below.Due to colourity basicly stable of RGBW, therefore compensation table should meet linear characteristic, can choose specific N number of GTG, it is only necessary to tries to achieve the offset W of these specific grey-scalecN、RcN、BcN, remaining GTG can be tried to achieve by this N number of specific grey-scale linear interpolation, be improve the speed of adjustment, further raising efficiency.The value of N can be chosen according to the linear characteristic of panel.
Table 1, Δ WRB type W sub-pixel numerical digit compensate LUT
As shown in Figure 8, it shows process schematic (as a example by Δ WRB type) correct the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point for the present invention in.RGB sub-pixel data first passes around alternate algorithm and is extracted by white content in RGB and represent by W sub-pixel data.W sub-pixel data compensate the WRB data after LUT mode obtains compensation through W sub-pixel numerical digit.The most all of RGBW compositional data is synthesized together output display and i.e. completes whole display process.
As it is shown in figure 9, it corrects compensation effect contrast schematic diagram in the Gamma voltage of alternative type RGBW panel and method one preferred embodiment of white point for the present invention.Before in Fig. 9, left side is for compensating, after right side is for compensating, it is seen that the present invention can cannot correct the deficiency of W sub-pixel colour cast in the way of only adjusting Gamma voltage to make up tradition, can be effectively improved the display performance of RGBW panel.
To sum up, the method of Gamma voltage and white point that the present invention corrects alternative type RGBW panel simply and easily realizes, make up traditional method only to adjust Gamma voltage and can not correct the deficiency of W sub-pixel colour cast, it is applicable to be adjusted to specification by the panel of the super rule degradation caused due to processing procedure difference aborning, factory's loss can be reduced.
The above, for the person of ordinary skill of the art, can conceive according to technical scheme and technology and make other various corresponding changes and deformation, and all these change and deformation all should belong to the protection domain of appended claims of the present invention.
Claims (10)
1. correcting Gamma voltage and the method for white point of alternative type RGBW panel, it is special
Levy and be, including:
Step 10, adjustment RGB sub-pixel Gamma voltage on GTG n；
Step 20, adjustment W sub-pixel Gamma voltage on GTG n；
Step 30, adjustment W sub-pixel RGBW numerical digit offset data on GTG n.
2. the Gamma voltage correcting alternative type RGBW panel as claimed in claim 1 and white point
Method, it is characterised in that step 10 includes: RGB sub-pixel is lighted, and W sub-pixel does not works, now
Show white picture, show by adjusting the Gamma Voltage Cortrol RGB sub-pixel of RGB sub-pixel three
The brightness shown so that GTG n brightness reaches object brightness, the brightness simultaneously adjusting RGB sub-pixel is joined
Ratio so that white point coordinates is in the specification of target.
3. the Gamma voltage correcting alternative type RGBW panel as claimed in claim 1 and white point
Method, it is characterised in that step 20 includes: RGB sub-pixel does not works, and W sub-pixel is lighted, now
Show white picture, by adjusting the brightness that the Gamma Voltage Cortrol W sub-pixel of W sub-pixel shows,
GTG n brightness is made to reach object brightness.
4. the Gamma voltage correcting alternative type RGBW panel as claimed in claim 1 and white point
Method, it is characterised in that step 30 includes: choose specific n GTG, by adjusting in GTG
The grey decision-making of RGBW sub-pixel so that the brightness of GTG and chromaticity correction, to goal standard, use RGB
Sub-pixel numerical digit compensates W sub-pixel, finally sets up the look-up table that W sub-pixel numerical digit compensates.
5. the Gamma voltage correcting alternative type RGBW panel as claimed in claim 2 and white point
Method, it is characterised in that in step 10, according to G sub-pixel, B sub-pixel, R sub-pixel suitable
Sequence is sequentially adjusted in corresponding Gamma voltage, and the Gamma voltage adjusting G sub-pixel is used for adjusting brightness,
The Gamma voltage adjusting B sub-pixel is used for adjusting colourity, adjusts the Gamma voltage of R sub-pixel
For adjusting colourity, the parameter adjusted the most at last all adjusts to the deviation threshold of target, if one
Brightness and colourity cannot be adjusted to target simultaneously and can realize by the way of circulation repeatedly restrains by secondary process.
6. the Gamma voltage correcting alternative type RGBW panel as claimed in claim 1 and white point
Method, it is characterised in that in step 10 use binary chop adjust Gamma voltage.
7. the Gamma voltage correcting alternative type RGBW panel as claimed in claim 4 and white point
Method, it is characterised in that step 30 also includes choosing W sub-pixel numerical digit and compensates type.
8. the Gamma voltage correcting alternative type RGBW panel as claimed in claim 7 and white point
Method, it is characterised in that according to W sub-pixel, B sub-pixel, the order of R sub-pixel is by adjusting
The mode of numerical digit grey decision-making makes to show that the brightness of picture and colourity meet goal standard, if a process
Brightness and colourity cannot be adjusted to target simultaneously can realize by the way of circulation repeatedly restrains.
9. the Gamma voltage correcting alternative type RGBW panel as claimed in claim 4 and white point
Method, it is characterised in that choose specific N number of GTG, try to achieve this N number of specific grey-scale numerical digit compensate
Value, the numerical digit offset of remaining GTG is tried to achieve according to this N number of specific grey-scale linear interpolation.
10. the Gamma voltage of correction alternative type RGBW panel as claimed in claim 9 is with white
The method of point, it is characterised in that the value of N is chosen according to the linear characteristic of this RGBW panel.
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| CN109752869A (en) * | 2019-01-24 | 2019-05-14 | 四川长虹电器股份有限公司 | The method for detecting liquid crystal WRGB screen optical property |
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| CN113241030A (en) * | 2021-04-27 | 2021-08-10 | 广东小天才科技有限公司 | Display screen brightness compensation method and device and electronic equipment |
| CN113284473A (en) * | 2021-05-27 | 2021-08-20 | 深圳市华星光电半导体显示技术有限公司 | White point correction method and device of display panel |
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| CN108492772A (en) * | 2018-03-30 | 2018-09-04 | 京东方科技集团股份有限公司 | A kind of Gamma adjusting methods and Gamma regulating systems |
| CN109752869A (en) * | 2019-01-24 | 2019-05-14 | 四川长虹电器股份有限公司 | The method for detecting liquid crystal WRGB screen optical property |
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| CN106023927B (en) | 2018-11-23 |
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