CN102930842A - Color track compensating method of liquid crystal display - Google Patents
Color track compensating method of liquid crystal display Download PDFInfo
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- CN102930842A CN102930842A CN2012104245070A CN201210424507A CN102930842A CN 102930842 A CN102930842 A CN 102930842A CN 2012104245070 A CN2012104245070 A CN 2012104245070A CN 201210424507 A CN201210424507 A CN 201210424507A CN 102930842 A CN102930842 A CN 102930842A
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Abstract
The invention relates to a color track compensating method of a liquid crystal display. According to the color track compensating method, backlight of an LED (Light Emitting Diode) backlight source and a liquid crystal display panel corresponding to the backlight of the LED backlight source are arranged; the method comprises the steps of: firstly, dividing the backlight into a plurality of blocks in the horizontal direction, wherein each block has a corresponding color compensation lookup list; measuring colors and brightness displayed by panels of the blocks, and calculating and filling the corresponding color compensation lookup lists according to the measured colors and brightness; aiming at an input display signal, determining the block of the panel which the input display signal belongs to, and determining the corresponding color compensation lookup list; and finally, outputting the value of the color compensation lookup list. The block color compensation is used for effectively improving the problem that a display panel of a liquid crystal display device displays different colors due to different distances between LED light bar light sources and the display panel so as to break the color uniformity of a displayed image.
Description
Technical field
The present invention relates to a kind of color track compensation method of liquid crystal display look, be specifically related to a kind of LED of employing as the compensation method of the liquid crystal display color of backlight source module.
Background technology
Existing liquid crystal indicator mostly provides light source as backlight as liquid crystal indicator take light emitting diode (light-emitting diode, LED).At present, in LED-backlit source in large-sized liquid crystal indicator usually have two-way or more LED lamp bars, wherein every paths of LEDs lamp bar utilizes respectively one tunnel corresponding driving circuit to drive, and realize that by the electric current in every paths of LEDs lamp bar of taking a sample the electric current in each paths of LEDs lamp bar equates, to satisfy the requirement of liquid crystal indicator display frame.As shown in Figure 1, because light guide plate can absorb short wavelength's light, it is different that liquid crystal indicator display panel 100 presents color from the nearly display panel with the distant place of LED lamp bar light source 200 in the LED-backlit of large scale side-light type lamp bar design, color indigo plant partially close to the light source; Color is partially yellow red away from the light source.Destroyed the homogeneity of display frame color.
Summary of the invention
The present invention is upper because light guide plate absorbs short wavelength's light in order to overcome, and has destroyed the homogeneity problem that makes liquid crystal indicator display frame color.
The invention provides a kind of color locus compensation method of liquid crystal display, the color by the backlight compensation liquid crystal display comprises the steps:
Step 1: on horizontal direction, be distinguished into a plurality of blocks with backlight, and each block has a corresponding color compensating to table look-up;
Step 2: color and brightness to the Display panel of each block measure, and calculate and fill in corresponding color according to the color that measures and brightness and compensate and table look-up;
Step 3: to the input display, then the block of panel under determining determines that the color compensating of correspondence is tabled look-up;
Step 4: export the value that above-mentioned color compensating is tabled look-up.
Wherein, color compensating corresponding to described each block tabled look-up and comprised that red color compensation is tabled look-up, green color compensating is tabled look-up and blue color compensating is tabled look-up.
Further, the described color compensating bit number of tabling look-up is higher than the bit number of input display.
Further, carry out the display conversion by FRC after the value output that described color compensating is tabled look-up.
Further, described each block has a corresponding multiplexer.
Further, convert signal to the bit data by demoder after the described input display input.
Beneficial effect: the present invention adopts and is distinguished on horizontal direction individual block backlight, by to the multi-tiling color compensation, has effectively improved display panels display frame color homogeneity problem.
Description of drawings
Fig. 1 is the LED-backlit device of side-light type lamp bar design;
Fig. 2 is synoptic diagram of the present invention;
Fig. 3 is the initial optical data of block 2 of the present invention;
Fig. 4 is the variation tendency of colourity or colour temperature in 0 to 255 GTG of 4 blocks of the present invention;
Fig. 5 is the color compensating of the block 2 among the present invention RGB_LUT2 that tables look-up;
Fig. 6 is compensation principle figure of the present invention.
Among the figure 100, display panel, 200, LED lamp bar light source.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
In the liquid crystal display of light emitting diode (light-emitting diode, LED) as backlight of large scale side-light type lamp bar design, at first on horizontal direction, be distinguished into a plurality of blocks with backlight.Present embodiment is distinguished into four blocks with backlight on horizontal direction, or with the display panel 100 of whole liquid crystal display along corresponding four blocks that on horizontal direction, are divided into backlight, as shown in Figure 2, be respectively block 1, block 2, block 3 and block 4.(this patent is not limited in being distinguished into four blocks and left side lamp bar 200 light source frameworks) decides the number of block of the division of block according to side-light type lamp bar position and light guide plate characteristic.And each block has the corresponding color compensating RGB_LUT that tables look-up, i.e. block 1 corresponding color compensation RGB_LUT1, the compensation of block 2 corresponding color RGB_LUT2, the compensation of block 3 corresponding color RGB_LUT3 and the compensation of the block 4 corresponding color RGB_LUT4 that tables look-up that tables look-up that tables look-up that tables look-up.
Each color compensating is tabled look-up and is comprised red color compensation R_LUT, green color compensation G_LUT and the blue color compensating B_LUT that tables look-up that tables look-up that tables look-up.Be that the block 1 corresponding color compensation RGB_LUT1 that tables look-up comprises red color compensation R_LUT1, green color compensation G_LUT1 and the blue color compensating B_LUT1 that tables look-up that tables look-up that tables look-up; The block 2 corresponding color compensation RGB_LUT2 that tables look-up comprises red color compensation R_LUT2, green color compensation G_LUT2 and the blue color compensating B_LUT2 that tables look-up that tables look-up that tables look-up; The block 3 corresponding color compensation RGB_LUT3 that tables look-up comprises red color compensation R_LUT3, green color compensation G_LUT3 and the blue color compensating B_LUT3 that tables look-up that tables look-up that tables look-up; The block 4 corresponding color compensation RGB_LUT4 that tables look-up comprises red color compensation R_LUT4, green color compensation G_LUT4 and the blue color compensating B_LUT4 that tables look-up that tables look-up that tables look-up.Measure respectively each GTG optical data of red R in each block, green G and blue B with optical instrument (CA210), obtain matrix form panel initial optical data.Because display panel is divided into four blocks, can obtain four groups of data.Take block 2 as example, measure respectively red green and blue each GTG optical data with optical instrument (CA210) in the block 2, show data instance (this patent is not limited and shown data in 8bit) with 8bit, can obtain matrix form panel initial optical data as shown in Figure 3, whole display panel is divided four blocks, can obtain altogether four groups as Fig. 3 data (not looking in other three picture groups).With four groups as data shown in Figure 3 with diagrammatic representation as shown in Figure 4, we know and know that in 0 to 255 GTG, the colourity of four blocks or colour temperature are all not identical from Fig. 4.The brightness of target contrast and the colourity that will present according to display panel, to in block 2, matrix form panel initial optical data pass through the red R that calculating can obtain one group of the best, green G, making up with blue B is to meet our brightness of target contrast and colourity, the color compensating that namely the obtains block 2 red color compensation of the RGB_LUT2 R_LUT2 that tables look-up that tables look-up, table look-up G_LU2T and blue color compensating of green color compensation tabled look-up B_LUT2 as shown in Figure 5, whole display panel is divided four blocks, can obtain altogether four groups as data shown in Figure 5 (not looking in other three picture groups), other three groups is respectively the color compensating of block 1 RGB_LUT1 that tables look-up, the color compensating of block 3 color compensating of RGB_LUT3 and block 4 RGB_LUT4 that tables look-up that tables look-up.
After the color compensating that obtains each block is tabled look-up, shown in compensation principle figure as shown in Figure 6, after receiver is received the LVDS display, demoder is decoded into this signal the image data of bit system of units, describe as an example of 8bit example, after decoding, generate the 8bit image data, these data are exported to the color compensating table LUT of each block and shown the Data Position detecting device, to judge through showing the Data Position detecting device color exceptions area that shows is to be in which block at present, and the data actuating signal from image data (DE)/line synchronizing signal (Hsync)/information such as field sync signal (Vsync) which pixel can determine present image data be in, be belong to the panel horizontal direction which block as shown in Figure 2.Determining present image data is after belonging to which block, and the Data Position detecting device starts the multiplexer MUX of affiliated this block, and multiplexer MUX will start corresponding the table look-up value of LUT of color compensating of answering in this block position of output.
Each block has a corresponding multiplexer MUX.For example at present image data belongs to block 2, decoded 8bit image data will be input to second color compensating LUT2 that tables look-up, and red image data is inputted respectively the red color compensation R_LUT2 that tables look-up; Green image data is inputted respectively green color and is compensated the G_LUT2 that tables look-up; Blue image data is inputted respectively the blue color compensating B_LUT2 that tables look-up.Through compensation data, can obtain one group of corresponding picture image 10bit data, after multiplexer MUX2 starts with the 10bit image data output of the color compensating table LUT2 of block 2, pass through again the DTU (Data Transfer unit) FRC of the time and space, the 10bit image data is converted to the 8bit image data and exports to converter, convert again the 8bit image data to the LVDS display, export to source electrode driver.
The color of the block type backlight compensation liquid crystal display by this programme has effectively improved display panels display frame color homogeneity problem.
Claims (6)
1. the color locus compensation method of a liquid crystal display, the color by the backlight compensation liquid crystal display is characterized in that: comprise the steps:
Step 1: on horizontal direction, be distinguished into a plurality of blocks with backlight, and each block has a corresponding color compensating to table look-up;
Step 2: color and brightness to the Display panel of each block measure, and calculate and fill in corresponding color according to the color that measures and brightness and compensate and table look-up;
Step 3: to the input display, then the block of panel under determining determines that the color compensating of correspondence is tabled look-up;
Step 4: export the value that above-mentioned color compensating is tabled look-up.
2. the according to claim 1 color locus compensation method of described a kind of liquid crystal display is characterized in that: color compensating corresponding to described each block tabled look-up and comprised that red color compensation is tabled look-up, green color compensating is tabled look-up and blue color compensating is tabled look-up.
3. the according to claim 1 color locus compensation method of described a kind of liquid crystal display is characterized in that: the bit number that described color compensating is tabled look-up is higher than the bit number of input display.
4. the according to claim 1 color locus compensation method of described a kind of liquid crystal display is characterized in that: carry out the display conversion by FRC after the value output that described color compensating is tabled look-up.
5. the according to claim 1 color locus compensation method of described a kind of liquid crystal display, it is characterized in that: described each block has a corresponding multiplexer.
6. the according to claim 1 color locus compensation method of described a kind of liquid crystal display is characterized in that: convert signal to the bit data by demoder after the described input display input.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105023268A (en) * | 2014-04-28 | 2015-11-04 | 郭文贵 | Emotional color representation system |
| CN109448653A (en) * | 2018-12-21 | 2019-03-08 | 惠科股份有限公司 | Method, collocation structure and the display device of display device compensation calculation |
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| CN101149908A (en) * | 2006-09-19 | 2008-03-26 | 三星电子株式会社 | Liquid crystal display |
| US20080111782A1 (en) * | 2006-11-11 | 2008-05-15 | Samsung Electronics Co., Ltd. | Liquid crystal display device and method for driving the same |
| CN102332242A (en) * | 2011-04-29 | 2012-01-25 | Geo半导体有限公司 | Be used to improve the color of backlight LCD display and the system and method for brightness uniformity |
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| US6243059B1 (en) * | 1996-05-14 | 2001-06-05 | Rainbow Displays Inc. | Color correction methods for electronic displays |
| CN101149908A (en) * | 2006-09-19 | 2008-03-26 | 三星电子株式会社 | Liquid crystal display |
| US20080111782A1 (en) * | 2006-11-11 | 2008-05-15 | Samsung Electronics Co., Ltd. | Liquid crystal display device and method for driving the same |
| CN101256749A (en) * | 2006-11-11 | 2008-09-03 | 三星电子株式会社 | Liquid crystal display and driving method thereof |
| CN102332242A (en) * | 2011-04-29 | 2012-01-25 | Geo半导体有限公司 | Be used to improve the color of backlight LCD display and the system and method for brightness uniformity |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105023268A (en) * | 2014-04-28 | 2015-11-04 | 郭文贵 | Emotional color representation system |
| CN109448653A (en) * | 2018-12-21 | 2019-03-08 | 惠科股份有限公司 | Method, collocation structure and the display device of display device compensation calculation |
| CN109448653B (en) * | 2018-12-21 | 2021-02-09 | 惠科股份有限公司 | Display device compensation calculation method, compensation structure and display device |
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Application publication date: 20130213 |