CN101697271A - Direct-type LED backlight color uniformity correction system and direct-type LED backlight color uniformity correction method - Google Patents
Direct-type LED backlight color uniformity correction system and direct-type LED backlight color uniformity correction method Download PDFInfo
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- CN101697271A CN101697271A CN200910218546A CN200910218546A CN101697271A CN 101697271 A CN101697271 A CN 101697271A CN 200910218546 A CN200910218546 A CN 200910218546A CN 200910218546 A CN200910218546 A CN 200910218546A CN 101697271 A CN101697271 A CN 101697271A
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Abstract
The invention relates to a direct-type LED backlight color uniformity correction system and a direct-type LED backlight color uniformity correction method. The direct-type LED backlight color uniformity correction system is characterized by comprising an LED backlight source liquid crystal display module (2) and a color testing device (1) optically connected with the LED backlight liquid crystal display module mutually, wherein the LED backlight source liquid crystal display module (2) comprises an LED backlight source unit, an LED backlight source driving control unit for driving the LED backlight source unit and a liquid crystal display screen; and the color testing device (1) tests the color data of the LED backlight source liquid crystal display module (2) through an optical lens and matched testing software and stores the data, and the stored data is analyzed to obtain a correction coefficient. The system and the adopted method have simple implementation and low cost, and are suitable to be used in mass production.
Description
Technical field
The present invention relates to the backlight of LCD technical field, be specifically related to a kind of direct LED backlight color uniformity corrective system and method.
Background technology
The LCD display technique need realize Presentation Function by backlight as a kind of non-self luminous display technique.Along with the continuous development of lcd technology, the LCD particularly application of colour liquid crystal display device is also constantly being widened.Spurred by the market of LCD, the backlight industry also presents a scene of prosperity.The LED-backlit source has great researching value and meaning as a kind of backlight with development potentiality.Yet color and brightness uniformity become the focal issue that faces when using color LED backlight.Color and brightness uniformity problem will directly influence the quality of LCD image.Therefore provide the bearing calibration of a kind of direct LED backlight color uniformity to become assistant officer's problem to be solved.
The method of prior art three-color LED backlight colour correction adopts feedback system to carry out the correction of color.This technology is the total system complexity comparatively speaking, and needing increases extra device (temperature sensor, chromaticity transducer or the like), and its cost is higher.
Summary of the invention
The purpose of this invention is to provide a kind of direct LED backlight color uniformity corrective system and method, this method is implemented simple, and is with low cost, is fit to use of large-scale production.
The objective of the invention is to realize that by following technical proposals a kind of direct LED backlight color uniformity corrective system is characterized in that: comprise LED-backlit liquid crystal display module and the color proving installation that is connected with its mutual light;
Described this LED-backlit source liquid crystal display module comprises the LED-backlit source unit and is used for the LED-backlit source driving control unit and the LCDs of driving LED backlight unit; Color data and storage that colour measuring device records LED-backlit source liquid crystal display module by optical lens and supporting testing software, the data of storage are handled by analysis and are obtained correction coefficient.
Colour measuring device of the present invention adopts the YC tester, and the LCDs of LED-backlit source liquid crystal display module adopts the LCD of three-color LED backlight.Described LED-backlit source unit adopts three-color LED light to form.Described LED-backlit source unit is according to the dynamic partition of a LED unit of red, green, blue grouping formation, and each LED unit can be lighted respectively and extinguish.
Direct LED backlight color uniformity of the present invention bearing calibration specifically comprises the steps:
1) obtains the chromaticity coordinate value of each LED-backlit unit by colour measuring device; And store the chromaticity coordinate value of this each LED unit that obtains;
2) judge that color uniformity is whether in specialized range, if correction coefficient is 1; If not, then proofread and correct; Its bearing calibration is: the RGB numerical value according to chromaticity coordinates transition matrix acquisition three-color LED obtains a matrix of coefficients according to each regional RGB numerical relation; The acquisition of matrix of coefficients will be benchmark with the color of central LED; And recently obtain the correction of color consistency according to the duty that the color correction coefficient that generates is adjusted the pulse-width signal of each area L ED.
3) color of selecting LED-backlit source central authorities zoning unit is adjusted other subregional color in the backlight, and is calculated one group of RGB correction coefficient as standard;
4) store the correction coefficient of this acquisition;
When 5) the liquid crystal display displays color uniformity is improper, call this correction coefficient.
The correction of carrying out color with respect to the method employing feedback system of prior art three-color LED backlight colour correction exists system complex, needs to increase extra device, cost problem of higher, the bearing calibration that the present invention proposes does not need to increase senser element, and cost reduces.Implementation method only needs a color proving installation and fairly simple analytical calculation just can finish simultaneously, is suitable for use of large-scale production.
The present invention proposes this direct LED backlight color uniformity bearing calibration obtains each LED unit, LED-backlit source by measurement mechanism chromaticity coordinates, calculate each regional correction coefficient according to predefined standard meter then, the correction coefficient that storage obtains is in storer.When adopting three-color LED LCD backlight in normal the demonstration, the back light unit of each subregion all calls the correction coefficient of self.Color uniformity bearing calibration provided by the invention, implementation method is simple, and is with low cost, is fit to use of large-scale production.
Description of drawings
Fig. 1 is a LED-backlit source color uniformity corrective system.
Fig. 2 LED-backlit source color uniformity bearing calibration process flow diagram.
Embodiment
As shown in Figure 1, system of the present invention comprises colour measuring device 1 and the LED-backlit source liquid crystal display module 2 that is connected with its mutual light.Wherein, this LED-backlit source liquid crystal display module 2 comprises the LED-backlit source unit and is used for the LED-backlit source driving control unit and the LCDs of driving LED backlight unit; Color data and storage that colour measuring device 1 records LED-backlit source liquid crystal display module 2 by optical lens and supporting testing software, the data of storage are handled by analysis and are obtained correction coefficient.
Each LED-backlit source unit all multiply by correction coefficient during the LCD operate as normal on the basis of original algorithm statistics, obtains the data of backlight reality.To realize the consistance of backlight color.
Colour measuring device 1 of the present invention adopts the YC tester, and the LCDs of LED-backlit source liquid crystal display module 2 adopts the LCD of three-color LED backlight.The LED-backlit source unit adopts three-color LED light to form.The LED-backlit source unit is according to the dynamic partition of a LED unit of red, green, blue grouping formation, and each LED unit can be lighted respectively and extinguish.The LED unit can be lighted respectively and extinguish is the measurement of carrying out each regional color for convenience.
Shown in Figure 2 is the concrete implementation step schematic block diagram of color uniformity bearing calibration.This method specifically comprises the steps:
1) installs the chromaticity coordinate value that obtains each LED-backlit unit by color measurements 1; And store the chromaticity coordinate value of this each LED unit that obtains; LED-backlit is divided into 75 zones, and each zone is controlled respectively by pulse-width signal independently.The dutycycle of each pulse-width signal is smaller or equal to 1 simultaneously.
2) the color proving installation is tested the chromaticity coordinates value of each LED-backlit source unit.As backlight being divided into 75 zones that can control respectively, then need by the color proving installation test respectively the chromaticity coordinates value that obtains 75 zones (L, x, y).Analyze the color uniformity in LED-backlit source according to the chromaticity coordinates value that obtains, according to predefined standard (as homogeneity greater than 90%), judge color uniformity whether in specialized range, if the standard that backlight obtains setting, then correction coefficient is 1.
Proofread and correct if the look homogeneity is lower than established standards then needs, its bearing calibration is: according to the RGB numerical value of chromaticity coordinates transition matrix acquisition three-color LED, obtain a matrix of coefficients of one 75 row 3 row according to each regional RGB numerical relation.The acquisition of matrix of coefficients will be benchmark with the color of central LED.The duty of adjusting the pulse-width signal of each area L ED according to the color correction coefficient that generates recently obtains the correction of color consistency.
Above-mentioned color correction coefficient can obtain by ProMetric brightness, illumination, the colour measurement equipment that adopts U.S. Radiant Imaging company.
3) select the color of LED-backlit source central authorities zoning unit as standard, adjust other subregional color in the backlight, and calculate one group of RGB correction coefficient, the RGB correction coefficient is on the basis of the color correction coefficient that generates, and is that benchmark 1 carries out the normalization aftertreatment and obtains with LED-backlit source central authorities correction coefficient;
4) store the RGB correction coefficient of this acquisition;
When 5) the liquid crystal display displays color uniformity is improper, call this correction coefficient.
In sum, can realize the color consistency of direct-light type LED backlight by method of the present invention.
Claims (6)
1. a direct LED backlight color uniformity corrective system is characterized in that: comprise LED-backlit liquid crystal display module (2) and the color proving installation (1) that is connected with its mutual light;
Described this LED-backlit source liquid crystal display module (2) comprises the LED-backlit source unit and is used for the LED-backlit source driving control unit and the LCDs of driving LED backlight unit; Color data and storage that colour measuring device (1) records LED-backlit source liquid crystal display module (2) by optical lens and supporting testing software, the data of storage are handled by analysis and are obtained correction coefficient.
2. direct LED backlight color uniformity corrective system according to claim 1, it is characterized in that: described colour measuring device (1) is the YC tester, and the LCDs of LED-backlit source liquid crystal display module (2) adopts the LCD of three-color LED backlight.
3. direct LED backlight color uniformity corrective system according to claim 1 is characterized in that: described LED-backlit source unit adopts three-color LED light to form.
4. direct LED backlight color uniformity corrective system according to claim 1, it is characterized in that: described LED-backlit source unit is according to the dynamic partition of a LED unit of red, green, blue grouping formation, and each LED unit can be lighted respectively and extinguish.
5. direct LED backlight color uniformity bearing calibration is characterized in that: described this method comprises the steps:
1) obtains the chromaticity coordinate value of each LED-backlit unit by colour measuring device (1); And store the chromaticity coordinate value of this each LED unit that obtains;
2) judge that color uniformity is whether in specialized range, if correction coefficient is 1; If not, then proofread and correct;
3) color of selecting LED-backlit source central authorities zoning unit is adjusted other subregional color in the backlight, and is calculated one group of RGB correction coefficient as standard;
4) store the RGB correction coefficient of this acquisition;
When 5) the liquid crystal display displays color uniformity is improper, call this correction coefficient.
6. direct LED backlight color uniformity according to claim 5 bearing calibration, it is characterized in that: described judgement color uniformity is not in specialized range, its bearing calibration is: the RGB numerical value according to chromaticity coordinates transition matrix acquisition three-color LED obtains a matrix of coefficients according to each the regional RGB numerical relation of color correction coefficient that generates; The acquisition of matrix of coefficients will be benchmark with the color of central LED; And recently obtain the correction of color consistency according to the duty that the color correction coefficient that generates is adjusted the pulse-width signal of each area L ED.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877217A (en) * | 2010-06-29 | 2010-11-03 | 彩虹集团公司 | Color correction method for LED liquid crystal display device |
| CN103983427A (en) * | 2014-05-22 | 2014-08-13 | 广东威创视讯科技股份有限公司 | Correction method based on LED lamp plate evenness |
| CN104236854A (en) * | 2013-06-17 | 2014-12-24 | 展晶科技(深圳)有限公司 | Light-emitting diode light source array simulating system and simulating method |
| WO2016101391A1 (en) * | 2014-12-22 | 2016-06-30 | 深圳市华星光电技术有限公司 | Method for improving brightness uniformity of liquid crystal module |
| CN107507560A (en) * | 2017-08-21 | 2017-12-22 | 杭州视芯科技有限公司 | Brightness correcting method and system for LED display |
| CN109000886A (en) * | 2018-05-23 | 2018-12-14 | Oppo广东移动通信有限公司 | A kind of light source detection method and device thereof, equipment and storage medium |
| CN110070829A (en) * | 2013-11-29 | 2019-07-30 | 乐金显示有限公司 | Organic LED display device and its brightness change compensation method |
| CN110796996A (en) * | 2018-08-02 | 2020-02-14 | Oppo（重庆）智能科技有限公司 | Color temperature calibration method and device for mobile terminal, electronic equipment and storage medium |
| CN113267928A (en) * | 2021-04-29 | 2021-08-17 | 北京京东方显示技术有限公司 | Backlight module, display module, color correction method, system and equipment |
-
2009
- 2009-10-27 CN CN200910218546A patent/CN101697271A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877217A (en) * | 2010-06-29 | 2010-11-03 | 彩虹集团公司 | Color correction method for LED liquid crystal display device |
| CN104236854A (en) * | 2013-06-17 | 2014-12-24 | 展晶科技(深圳)有限公司 | Light-emitting diode light source array simulating system and simulating method |
| CN110070829A (en) * | 2013-11-29 | 2019-07-30 | 乐金显示有限公司 | Organic LED display device and its brightness change compensation method |
| CN103983427A (en) * | 2014-05-22 | 2014-08-13 | 广东威创视讯科技股份有限公司 | Correction method based on LED lamp plate evenness |
| WO2016101391A1 (en) * | 2014-12-22 | 2016-06-30 | 深圳市华星光电技术有限公司 | Method for improving brightness uniformity of liquid crystal module |
| CN107507560A (en) * | 2017-08-21 | 2017-12-22 | 杭州视芯科技有限公司 | Brightness correcting method and system for LED display |
| CN109000886A (en) * | 2018-05-23 | 2018-12-14 | Oppo广东移动通信有限公司 | A kind of light source detection method and device thereof, equipment and storage medium |
| CN110796996A (en) * | 2018-08-02 | 2020-02-14 | Oppo（重庆）智能科技有限公司 | Color temperature calibration method and device for mobile terminal, electronic equipment and storage medium |
| CN110796996B (en) * | 2018-08-02 | 2021-03-16 | Oppo（重庆）智能科技有限公司 | Color temperature calibration method and device for mobile terminal, electronic equipment and storage medium |
| CN113267928A (en) * | 2021-04-29 | 2021-08-17 | 北京京东方显示技术有限公司 | Backlight module, display module, color correction method, system and equipment |
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Open date: 20100421 |