CN102779491B - Method and device for compensating field sequential backlight color - Google Patents
Method and device for compensating field sequential backlight color Download PDFInfo
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Abstract
The invention discloses a method and a device for compensating a field sequential backlight color. The method and the device are used for solving the technical problems that the present common field sequential backlight technology is poor in color expressive force and inferior in color saturation. According to a twice compensating technology adopted by the invention, a first compensating calculation for an image signal is utilized to decompose an image signal into a screen image and a backlight luminance distribution, and then the screen image is compared with an original image, and finally the screen image is compensated for the second time. After the twice compensation is performed, the color saturation of the field sequential backlight technology is increased, the color expressive force is improved and the display effect of a frame is promoted.
Description
Technical field
The present invention relates to the backlight of liquid crystal display, relate in particular to the color compensation method of order backlight and a device.
Background technology
The field order principle of work of regular display is by controlling backlight RGB tri coloured lantern, light successively according to time sequencing, due to the persistence of vision effect of human eye, realize temporal colour mixture, Fig. 1 is that display effect is a kind of the order backlit display principle of work of 60Hz, wherein mark region is 1. the deflection period of pixel liquid crystal molecule, and mark white space is 2. the pixel liquid crystal molecule retention time, and mark region is 3. that homochromy backlight LED is lighted the time.It should be noted that the deflection period of liquid crystal pixel and the response time of pixel are not identical, this is because of the image difference showing, liquid crystal molecule needs the angle of deflection just different, completes and specifies the time of deflection angle just different, by the deflection control color of liquid crystal, realize final picture disply.
Fig. 2 is the image displaying principle figure of common order backlight technology, wherein the signal of screen picture comes from image source, common image source has TV, computer and DVD etc., image source shows on screen with the form of picture one by one, Here it is screen picture, just forms the various images of playing on the display device that spectators see through continual frame picture disply.It should be noted that any image can show with red-green-blue, screen picture also embodies by rgb pixels.Any one image can be used three representation in components of RGB, being presented on screen by Circuits System is exactly the anglec of rotation difference by three sub-pixel liquid crystals of RGB of all pixels on screen, and three color components are embodied according to certain ratio.In common order backlight design, as long as redgreenblue LED lamp is opened with equal proportion, the color relation that backlight shows is white.If the opening degree of red light, green light and blue lamp is all 100%, backlight is white, and when RGB lamp opening degree is all 50%, backlight be also white, unique luminance difference that is not both.
In common order is backlight, the heterochromia that shows image is that the liquid crystal anglec of rotation of three sub-pixels of RGB by controlling screen pixels realizes, and the liquid crystal anglec of rotation is realized by voltage signal control.The voltage signal of sub-pixel image is to be determined by the RGB component value of image corresponding pixel points essentially.For instance, common order is backlight as follows: if the GTG value of image any point is RGB (r1, g1, b1), the pixel gray level value RGB that shows the corresponding point of image on screen is also (r1, g1, b1), backlight is all opened by 100% brightness order according to RGB lamp.
The advantage of order backlight technology is to remove color filter film, and significantly conservation cost becomes pixel size original 1/3rd, significantly improves resolution.But the color saturation of existing order backlight technology and expressive force and regular display also have very large deviation, can not reach and meet the degree that ordinary consumer requires.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of order backlight color compensation method and device, not good for solving existing common order backlight technology color representation power, the technical matters that color saturation is poor.
For achieving the above object, technical scheme of the present invention is achieved in that
Based on the embodiment of the present invention, the invention provides the compensation method of a kind of order backlight color, the method comprises:
According to penalty function or compensation relationship table, original image is decomposed into screen picture and two parts of backlight illumination distribution, distributes and jointly show described original image by the screen picture after compensation and backlight illumination.
Further, the compensation method of described order backlight color also comprises the steps:
To decompose the screen picture and the original image that obtain according to penalty function or compensation relationship table and contrast, to can not with backlight color one to one screen picture part compensate for the second time, obtain the screen picture after compensating for the second time.
Further, before carrying out described decomposition, also comprise the following step of setting up described penalty function or compensation relationship table:
S1, measurement RGB backlight are all opened by an order with 100% brightness, the chromaticity coordinates of demonstration image when the various GTG values of liquid crystal display red green and blue combine corresponding screen picture;
S2, measure under liquid crystal display display white screen picture state, when the chromaticity coordinates of the demonstration image that the chromaticity coordinates that shows image obtains for step S1, the brightness ratio that corresponding RGB backlight is opened;
The brightness ratio of RGB backlight unlatching in S3, RGB GTG value by showing the screen picture that in the chromaticity coordinates associated steps S1 of image, liquid crystal display shows and step S2, thus set up described compensation relationship table or set up described penalty function by matched curve method.
Further, an order backlight color compensation method also comprises:
Screen picture after described compensation is for the second time exported to time schedule controller, and the backlight illumination that described decomposition is obtained afterwards distributes and exports to an order backlight control circuit.
Further, an order backlight color compensation method is applied in straight-down negative and side-light type field order backlight display system.
Based on the embodiment of the present invention, the present invention also provides a kind of order backlight color compensation system, comprising:
Memory module, for storing penalty function or compensation relationship table;
Compensating module for the first time, is decomposed into screen picture and two parts of backlight illumination distribution according to penalty function or compensation relationship table by original image, is distributed and is jointly shown described original image by the screen picture after compensation and backlight illumination.
Further, described order backlight color compensation system also comprises:
Compensating module for the second time, for by described through for the first time compensation screen picture and original image contrast, to can not with backlight color one to one screen picture part compensate for the second time, output through for the second time compensate after screen picture.
Further, described compensating module for the first time receives original image signal from machine core board, original image is compensated for the first time, and will export to compensating module for the second time through the screen picture of compensation for the first time, the backlight illumination through compensation is for the first time distributed and exports to an order backlight control circuit; Compensating module will be exported to time schedule controller through the screen picture of compensation for the second time for the second time.
Further, described field order backlight color compensation system and machine core board and/or time schedule controller and/or an order backlight control circuit are integrated on a circuit board; Or be integrated on independent circuit board.
Further, described order backlight color compensation system is applied in straight-down negative and side-light type field order backlight display system.
The present invention carries out the compensation of two aspects to backlight and screen picture respectively, promote a saturated object of color of order display frame backlight thereby reach, preferably the present invention adopts second compensation technology, be that screen picture and backlight illumination distribute by compensation operation for the first time by source images signal decomposition, and then by the comparison to screen picture and source images, screen picture is carried out to second compensation, after twice compensation, further improve the color saturation of an order backlight technology, improved the display effect of picture.
Brief description of the drawings
Fig. 1 is the fundamental diagram of existing order backlight;
Fig. 2 is the displaying principle figure based on existing order backlight;
The process flow diagram of the field order backlight color compensation method that Fig. 3 provides for the embodiment of the present invention;
The field order backlight color compensation method that Fig. 4 provides for the embodiment of the present invention adopts double compensation field order backlight technology to show the schematic diagram of image;
Fig. 5 is existing order backlight circuit theory diagrams;
Fig. 6 is the field order backlight circuit theory diagrams that comprise provided by the invention order backlight color compensation system provided by the invention.
Embodiment
Basic thought of the present invention is: the compensation of screen picture two aspects that show by the brightness to single LED lamp of backlight (comprising red light, green light, blue lamp) with to liquid crystal display, reach and promote an object for the color saturation of order backlight technology, thereby it is not good to solve a color representation power of order technology, the problem that color saturation is poor.
For making the object, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 3 is provided by the invention order backlight color compensation method realization flow figure, and the method is by adopting the mode of twice compensation to promote a color saturation for order backlight technology, and concrete steps are as follows:
Step 301, by measuring and data fitting is set up for penalty function y=f (x) or the compensation relationship table of compensation operation for the first time;
Described penalty function or compensation relationship table show in the definite situation of the chromaticity coordinates of image for being reflected in, corresponding relation between the brightness ratio that under the GTG value of the RGB sub-pixel of the screen picture that liquid crystal display shows and specific liquid crystal display response frequency, backlight RGB backlight is opened, the method for setting up penalty function and compensation relationship table is specially:
Step S1, measurement are according to existing common order principle of work backlight, and RGB backlight is all opened in order with 100% brightness, the chromaticity coordinates of demonstration image when the various GTG values of liquid crystal display red green and blue combine corresponding screen picture;
Step S2, measurement liquid crystal display display white screen picture are under white picture state, while showing the chromaticity coordinates of the demonstration image that the chromaticity coordinates of image obtains for step S1, corresponding RGB backlight is opened brightness ratio, the electric current dutycycle that RGB backlight is corresponding;
The electric current dutycycle of described RGB backlight has determined brightness ratio, and then has determined chromaticity coordinates;
The brightness ratio of RGB backlight unlatching in step S3, RGB GTG value by showing the screen picture that in the chromaticity coordinates associated steps S1 of image, liquid crystal display shows and step S2, thus set up described compensation relationship table or set up described penalty function by matched curve method.
In theory, the various GTG value combinations of RGB have 256*256*256 kind combined situation, and measurement data amount is larger, so in actual applications, can a measure portion data set up penalty function, or set up compensation relationship table by methods such as data interpolatings, to reduce the number of times of measurement.No matter set up penalty function or set up compensation relationship table, all only need to measure once, application in calculation that just can be afterwards.
Below illustrate the process of establishing of penalty function and compensation relationship table:
Set up RGB GTG combination (255 in penalty function initial value or compensation relationship table, 0,0) offset, when measurement field order backlight red, green and blue LED lamp is all opened in order with 100% brightness, screen picture RGB GTG value is (255,0,0) chromaticity coordinates time is (0.68,0.23); Then, when measuring screen picture and being white picture, when the chromaticity coordinates that shows image be (0.68,0.23), backlight RGB lamp unlatching brightness ratio is (100%, 0%, 0%); Completed the measurement of value in a penalty function initial value or compensation relationship table by measurement above, be (0.68 at the chromaticity coordinates that shows image, 0.23) time, the RGB GTG value (255 of screen picture, 0,0) brightness ratio (100% of corresponding backlight RGB lamp, 0%, 0%), after multiple respective value complete, can find fitting function by methods such as fitting of a polynomials, or between multiple respective value, carry out the method for interpolation, set up penalty function or compensation relationship table.
After the penalty function completing or compensation relationship table, be stored in the chip of control circuit, for the original image of input is compensated, then the result after compensation passed to backlight and liquid crystal display simultaneously.
Step 302, according to penalty function or compensation relationship table, original image is compensated for the first time, obtain through the screen picture of compensation for the first time and backlight illumination two parts that distribute by single compensation computing;
In this step, according to penalty function or compensation relationship table, original image is decomposed into screen picture and backlight illumination two parts that distribute, jointly shows original image by two-part compensation that screen picture and backlight illumination are distributed.The i.e. process of compensation for the first time of the step of described decomposition, compensates screen picture and backlight respectively, compares the mode that existing common order backlight technology only compensates screen picture, can further promote the color saturation of display frame.Screen image signal is exported to liquid crystal display by time schedule controller; Backlight illumination distribution refers to the Luminance Distribution of the red, green and blue LED backlight of screen picture corresponding region.
Further, screen picture through compensation for the first time likely can not be corresponding one by one with zones of different backlight color, therefore need carrying out second compensation through the screen picture of compensation for the first time, further to promote the color saturation of display frame, the method compensating is for the second time as described in step 303.
Step 303, will through for the first time compensation screen picture and original image contrast, to can not with backlight color one to one screen picture part compensate for the second time, obtain through for the second time compensate after screen picture;
Described compensation for the second time can adopt one or more in image processing method: mean value method, maximum value process, Fourier transform, wavelet analysis method etc.
Step 304, the screen picture after twice compensation is exported to time schedule controller, time schedule controller output screen picture signal is to liquid crystal display; Backlight illumination after single compensation is distributed and exports to an order backlight control circuit, and an order backlight control circuit is exported control signal again to driving circuit, drives backlight by driving circuit; After the stack backlight that the screen picture that liquid crystal display shows and backlight produce, obtain final demonstration image.
Fig. 4 is that the compensation method of provided by the invention order backlight color adopts double compensation field order backlight technology to show the displaying principle figure of image, as seen from the figure, original image is made up of RGB component, by method and apparatus provided by the invention, original image is carried out to twice compensation, obtaining the screen picture after twice compensation and the backlight illumination after single compensation distributes, described screen picture is made up of pixel, each pixel is made up of three sub-pixels of RGB again, the compensation of screen picture is adjusted each sub-pixel of the each pixel that forms screen picture, described field order is backlight to be made up of with an order backlight control circuit the LED lamp of tri-kinds of colors of RGB and the driving circuit of LED lamp, order backlight control circuit is lighted tri-kinds of color LED of RGB time and duration signal according to RGB or red bluish-green or blue red green or bluish-green red or green red indigo plant or turquoise red order, pass to driving circuit, driving circuit lightening LED lamp, described demonstration image is distributed by screen picture and backlight illumination, and stack output is rear to be formed.
Based on order backlight color provided by the invention compensation method, the present invention also provides a kind of order backlight color compensation system, and this device comprises: relationship storage module, for the first time compensating module and compensating module for the second time;
Relationship storage module, for storing penalty function or compensation relationship table;
Compensating module for the first time, for according to penalty function or compensation relationship table, original image being compensated for the first time, obtains screen picture and two parts of backlight illumination distribution through compensation for the first time by compensation operation;
Compensating module for the second time, for by described through for the first time compensation screen picture and original image contrast, to can not with backlight color one to one picture part compensate for the second time, output through for the second time compensate after screen picture.
Described compensating module for the first time receives original image signal from machine core board, will export to compensating module for the second time through the screen picture of compensation for the first time, and the backlight illumination through compensation is for the first time distributed and exports to an order backlight control circuit; Compensating module will be exported to time schedule controller through the screen picture of compensation for the second time for the second time.
Field order backlight technology has two kinds of backlights, and a kind of is straight-down negative, and another kind is side-light type, and above-mentioned two kinds of field order backlight technology method and apparatus provided by the invention are all suitable for, identical for the compensation principle of two kinds of backlights.
Taking direct-light-type backlight as example, the circuit theory that uses provided by the invention order backlight color compensation system in the display system that adopts direct-light-type backlight is described below.Fig. 5 is the displaying principle figure of common order backlight technology, and Fig. 6 is the field order backlight technology displaying principle figure that comprises provided by the invention order backlight color compensation system provided by the invention.By relatively finding, in display system provided by the invention, between machine core board, time schedule controller, an order backlight control circuit, increase provided by the invention order backlight color compensation system, this device will be exported to time schedule controller through the screen image signal of compensation, and the field order backlight illumination through compensation is distributed and exports to an order backlight control circuit.
Order backlight color compensation system provided by the invention can be integrated on a circuit board with machine core board and/or time schedule controller and/or an order backlight control circuit, also can make separately circuit board.
The present invention is in the time setting up compensation relationship table or penalty function, can select the GTG value interval of step-length 5 as a metrophia compensation relation, select 0, 5, 10, 15, 20, 25, ..., 255 as basic data, select r=(0, 5, 10, 15, 20, ..., 255), g=(0, 5, 10, 15, 20, ..., 255), b=(0, 5, 10, 15, 20, ..., 255), brightness value while measuring corresponding backlight unlatching, the data that three kinds of colors need to be measured are so altogether 51*51*51 group, 153 data, complete the foundation of penalty function table by method of interpolation, by pre-stored penalty function table in order backlight color compensation system provided by the invention, compensating the application of tabling look-up while calculating.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (9)
1. a field order backlight color compensation method, is characterized in that, the method comprises:
According to penalty function or compensation relationship table, original image is compensated for the first time, by described compensation operation for the first time, original image is decomposed into screen picture and two parts of backlight illumination distribution, distributes and jointly show described original image by the screen picture after compensation and backlight illumination;
Wherein, described penalty function or compensation relationship table show in the definite situation of the chromaticity coordinates of image for being reflected in, the corresponding relation under the GTG value of the RGB sub-pixel of the screen picture that liquid crystal display shows and specific liquid crystal display response frequency between the brightness ratio of backlight RGB backlight unlatching;
Before carrying out described decomposition, also comprise the following step of setting up described penalty function or compensation relationship table:
S1, measurement RGB backlight are all opened by an order with 100% brightness, the chromaticity coordinates of demonstration image when the various GTG values of liquid crystal display red green and blue combine corresponding screen picture;
S2, measure under liquid crystal display display white screen picture state, when the chromaticity coordinates of the demonstration image that the chromaticity coordinates that shows image obtains for step S1, the brightness ratio that corresponding RGB backlight is opened;
The brightness ratio of RGB backlight unlatching in S3, RGB GTG value by showing the screen picture that in the chromaticity coordinates associated steps S1 of image, liquid crystal display shows and step S2, thus set up described compensation relationship table or set up described penalty function by matched curve method.
2. method according to claim 1, is characterized in that, described method also comprises:
To decompose the screen picture and the original image that obtain according to penalty function or compensation relationship table and contrast, to can not with backlight color one to one screen picture part compensate for the second time, obtain the screen picture after compensating for the second time.
3. method according to claim 2, is characterized in that, described method also comprises:
Screen picture after described compensation is for the second time exported to time schedule controller, and the backlight illumination that described decomposition is obtained afterwards distributes and exports to an order backlight control circuit.
4. method according to claim 1, is characterized in that, described method is applied in straight-down negative and side-light type field order backlight display system.
5. a field order backlight color compensation system, is characterized in that, this device comprises:
Memory module, for storing penalty function or compensation relationship table;
Compensating module for the first time, according to penalty function or compensation relationship table, original image is compensated for the first time, by described compensation operation for the first time, original image is decomposed into screen picture and two parts of backlight illumination distribution, distributes and jointly show described original image by the screen picture after compensation and backlight illumination;
Wherein, described penalty function or compensation relationship table show in the definite situation of the chromaticity coordinates of image for being reflected in, the corresponding relation under the GTG value of the RGB sub-pixel of the screen picture that liquid crystal display shows and specific liquid crystal display response frequency between the brightness ratio of backlight RGB backlight unlatching;
Before carrying out described decomposition, also comprise the following step of setting up described penalty function or compensation relationship table:
S1, measurement RGB backlight are all opened by an order with 100% brightness, the chromaticity coordinates of demonstration image when the various GTG values of liquid crystal display red green and blue combine corresponding screen picture;
S2, measure under liquid crystal display display white screen picture state, when the chromaticity coordinates of the demonstration image that the chromaticity coordinates that shows image obtains for step S1, the brightness ratio that corresponding RGB backlight is opened;
The brightness ratio of RGB backlight unlatching in S3, RGB GTG value by showing the screen picture that in the chromaticity coordinates associated steps S1 of image, liquid crystal display shows and step S2, thus set up described compensation relationship table or set up described penalty function by matched curve method.
6. device according to claim 5, is characterized in that, described device also comprises:
Compensating module for the second time, for by described through for the first time compensation screen picture and original image contrast, to can not with backlight color one to one screen picture part compensate for the second time, output through for the second time compensate after screen picture.
7. device according to claim 6, is characterized in that,
Described compensating module for the first time receives original image signal from machine core board, original image is compensated for the first time, and will export to compensating module for the second time through the screen picture of compensation for the first time, the backlight illumination through compensation is for the first time distributed and exports to an order backlight control circuit;
Compensating module will be exported to time schedule controller through the screen picture of compensation for the second time for the second time.
8. device according to claim 5, is characterized in that, described device and machine core board and/or time schedule controller and/or an order backlight control circuit are integrated on a circuit board; Or be integrated on independent circuit board.
9. device according to claim 5, is characterized in that, described application of installation is in straight-down negative and side-light type field order backlight display system.
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| CN105357505B (en) * | 2015-11-11 | 2018-07-10 | 广东威创视讯科技股份有限公司 | Digital optical processor core color compensation method, system and signal processing chip |
| US10600213B2 (en) | 2016-02-27 | 2020-03-24 | Focal Sharp, Inc. | Method and apparatus for color-preserving spectrum reshape |
| CN110114819A (en) * | 2016-09-30 | 2019-08-09 | 夏普株式会社 | Field sequence type image display device and image display method |
| TWI729322B (en) * | 2018-11-08 | 2021-06-01 | 財團法人工業技術研究院 | Information display system and information display method |
| CN109935206B (en) * | 2019-04-15 | 2021-08-20 | 京东方科技集团股份有限公司 | Neural network-based display device brightness compensation method, device and equipment |
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