CN101996586A - Multi-sensor zone control LED backlight brightness system and method - Google Patents
Multi-sensor zone control LED backlight brightness system and method Download PDFInfo
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- CN101996586A CN101996586A CN 201010533580 CN201010533580A CN101996586A CN 101996586 A CN101996586 A CN 101996586A CN 201010533580 CN201010533580 CN 201010533580 CN 201010533580 A CN201010533580 A CN 201010533580A CN 101996586 A CN101996586 A CN 101996586A
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Abstract
The invention discloses a multi-sensor zone control LED backlight brightness system and a multi-sensor zone control LED backlight brightness method. A brightness sensor is mounted in each zone. The driving circuit in each zone is also independent. The brightness sensor collects the brightness data of each zone. The driving circuit controls an LED backlight of each zone. The system is electrified to light the backlight by specified data. A controller collects the data of the sensor, normalizes the collected data to eliminate difference and sampling error between sensors, compares the data of each zone with a set standard value to see whether the data is the same as the standard value, if the collected data is bigger than the standard value, reduces the brightness-driven data of the zone, if smaller, increases the brightness-driven data of the zone. The system of the invention has a simple and reliable circuit, independent LED backlight of each zone, which does not interference with each other, avoids the phenomenon of nonuniform brightness generated by the LED backlight, and is high in efficiency and accuracy.
Description
Technical field
The present invention relates to brilliance control field, LED-backlit source, be specifically related to a kind of multisensor subregion control LED-backlit brightness system and method.
Background technology
Liquid crystal itself is not luminous, must backrest optical mode group provide light source to work.In the past, the LCD backlight is mainly based on CCFL (Cold-Cathode Fluorescent Lamps), it has characteristics such as linear luminous, that brightness is high, light source is even, but it is short also to exist the life-span, the shortcoming that colour rendering is relatively poor relatively, Comparatively speaking, the LED-backlit source has that color rendition is good, power saving, life-span are long, pollute little (not containing mercury), reliability advantages of higher, use the LED-backlit source can make the LCD color range improve one times nearly, the backlight response speed significantly improves.Because LED has these advantages, has received increasing concern.Now, adopted LED as backlight on a lot of net books and the HDTV, but the LED lamp is because be subjected to the influence of factors such as temperature, service time, brightness decay in various degree appears, and its brightness also can be different because of drive current, can occur the phenomenon of brightness irregularities after long-time the use.
Summary of the invention
The purpose of this invention is to provide a kind of multisensor subregion control LED-backlit brightness system and method, improve the efficient and the accuracy of the backlight white balance adjustment of redgreenblue light emitting diode.
Technical scheme of the present invention is as follows:
A kind of multisensor subregion is controlled LED-backlit brightness system, form by controller, a plurality of luminance sensor, a plurality of brightness data Acquisition Circuit, multizone LED-backlit lamp and a plurality of driving circuit, it is characterized in that: described a plurality of luminance sensors insert the signal input part of described controller respectively with after described a plurality of brightness data Acquisition Circuit link to each other in twos; Described LED multizone backlight inserts the signal output part of described controller with after described a plurality of driving circuits link to each other in twos.
Each luminance sensor is gathered the brightness data of each area L ED backlight respectively, each brightness data acquisition process circuit is handled individual luminance sensor output signal, controller carries out analysis and judgement to the brightness data of each area L ED backlight, control each area L ED backlight dim signal, each backlight drive circuit carries out processing and amplifying to the dim signal of controller output, to drive each regional LED-backlit lamp.
A kind of multisensor subregion control LED-backlit brightness method, it is characterized in that: it specifically may further comprise the steps:
(1), with a plurality of luminance sensors with after a plurality of brightness data Acquisition Circuit link to each other in twos, the signal input part of access controller respectively; Again with the multizone backlight with after a plurality of driving circuits link to each other in twos, the signal output part of access controller powers on then respectively, lights the LED-backlit lamp;
(2), each luminance sensor gathers the brightness data of each area L ED backlight respectively, and after correspondence sends into each brightness data Acquisition Circuit and handle, sends into controller again;
(3), controller reads the brightness data of the LED-backlit lamp that each brightness data Acquisition Circuit sends into, and obtains the brightness value of each area L ED backlight after handling;
(4), controller will be compared by the brightness value of each area L ED backlight of step (3) gained and the standard value of setting, if the brightness value of each area L ED backlight of gained is bigger than the standard value of setting, then reduce the brightness of respective regions LED-backlit lamp, return the brightness data that step (2) reads each area L ED backlight of each brightness data Acquisition Circuit collection again then, carry out next one circulation, progressively operate again according to above-mentioned steps; If the brightness value of each area L ED backlight of gained is littler than the standard value of setting, then increase the brightness of respective regions LED-backlit lamp, return the brightness data that step (2) reads each area L ED backlight of each brightness data Acquisition Circuit collection again then, carry out next one circulation, progressively operate again according to above-mentioned steps; If the brightness value of each area L ED backlight of gained equates with the standard value of setting, then directly return the brightness data that step (2) reads each area L ED backlight of each brightness data Acquisition Circuit collection again, carry out next one circulation, progressively operate again according to above-mentioned steps.
Beneficial effect of the present invention:
Circuit system of the present invention is simple and reliable, and separate between each area L ED backlight, do not disturb mutually, has solved the brightness irregularities phenomenon that the LED-backlit source produces, and efficient height, accuracy height.
Description of drawings
Fig. 1 is a system principle diagram of the present invention.
Fig. 2 is a method flow diagram of the present invention.
Embodiment
Referring to Fig. 1,2, a kind of multisensor subregion is controlled LED-backlit brightness system, form by controller, a plurality of luminance sensor, a plurality of brightness data Acquisition Circuit, multizone LED-backlit lamp and a plurality of driving circuit, a plurality of luminance sensors are with after a plurality of brightness data Acquisition Circuit link to each other in twos, respectively the signal input part of access controller; LED multizone backlight is with after a plurality of driving circuits link to each other in twos, the signal output part of access controller.
Each luminance sensor is gathered the brightness data of each area L ED backlight respectively, each brightness data acquisition process circuit is handled individual luminance sensor output signal, controller carries out analysis and judgement to the brightness data of each area L ED backlight, control each area L ED backlight dim signal, each backlight drive circuit carries out processing and amplifying to the dim signal of controller output, to drive each regional LED-backlit lamp.
A kind of multisensor subregion control LED-backlit brightness method specifically may further comprise the steps:
(1), with a plurality of luminance sensors with after a plurality of brightness data Acquisition Circuit link to each other in twos, the signal input part of access controller respectively; Again with the multizone backlight with after a plurality of driving circuits link to each other in twos, the signal output part of access controller powers on then respectively, lights the LED-backlit lamp;
(2), each luminance sensor gathers the brightness data of each area L ED backlight respectively, and after correspondence sends into each brightness data Acquisition Circuit and handle, sends into controller again;
(3), controller reads the brightness data of the LED-backlit lamp that each brightness data Acquisition Circuit sends into, and obtains the brightness value of each area L ED backlight after handling;
(4), controller will be compared by the brightness value of each area L ED backlight of step (3) gained and the standard value of setting, if the brightness value of each area L ED backlight of gained is bigger than the standard value of setting, then reduce the brightness of respective regions LED-backlit lamp, return the brightness data that step (2) reads each area L ED backlight of each brightness data Acquisition Circuit collection again then, carry out next one circulation, progressively operate again according to above-mentioned steps; If the brightness value of each area L ED backlight of gained is littler than the standard value of setting, then increase the brightness of respective regions LED-backlit lamp, return the brightness data that step (2) reads each area L ED backlight of each brightness data Acquisition Circuit collection again then, carry out next one circulation, progressively operate again according to above-mentioned steps; If the brightness value of each area L ED backlight of gained equates with the standard value of setting, then directly return the brightness data that step (2) reads each area L ED backlight of each brightness data Acquisition Circuit collection again, carry out next one circulation, progressively operate again according to above-mentioned steps.
The present invention is further illustrated below in conjunction with accompanying drawing:
Fig. 1 has shown the system principle diagram of multisensor subregion control LED-backlit brightness, in each zone of being divided a luminance sensor is installed all, and each regional driving circuit also is independently.The luminance sensor collection is the brightness data in zone separately, and driving circuit control is the LED-backlit lamp in zone separately.
Fig. 2 has shown the method flow diagram of multisensor subregion control LED-backlit brightness, system powers on, light backlight with specific data, controller pick-up transducers data, the data of gathering are done normalized to eliminate difference and the sampling error between the sensor, respectively the standard value of each area data and setting is made comparisons, whether identically see, if the data overgauge value of gathering then reduce this regional brightness driving data is if the data of gathering are less than standard value then increase this regional brightness driving data.
Claims (2)
1. a multisensor subregion is controlled LED-backlit brightness system, form by controller, a plurality of luminance sensor, a plurality of brightness data Acquisition Circuit, multizone LED-backlit lamp and a plurality of driving circuit, it is characterized in that: described a plurality of luminance sensors insert the signal input part of described controller respectively with after described a plurality of brightness data Acquisition Circuit link to each other in twos; Described LED multizone backlight inserts the signal output part of described controller with after described a plurality of driving circuits link to each other in twos.
2. a multisensor subregion is controlled LED-backlit brightness method, and it is characterized in that: it specifically may further comprise the steps:
(1), with a plurality of luminance sensors with after a plurality of brightness data Acquisition Circuit link to each other in twos, the signal input part of access controller respectively; Again with the multizone backlight with after a plurality of driving circuits link to each other in twos, the signal output part of access controller powers on then respectively, lights the LED-backlit lamp;
(2), each luminance sensor gathers the brightness data of each area L ED backlight respectively, and after correspondence sends into each brightness data Acquisition Circuit and handle, sends into controller again;
(3), controller reads the brightness data of the LED-backlit lamp that each brightness data Acquisition Circuit sends into, and obtains the brightness value of each area L ED backlight after handling;
(4), controller will be compared by the brightness value of each area L ED backlight of step (3) gained and the standard value of setting, if the brightness value of each area L ED backlight of gained is bigger than the standard value of setting, then reduce the brightness of respective regions LED-backlit lamp, return the brightness data that step (2) reads each area L ED backlight of each brightness data Acquisition Circuit collection again then, carry out next one circulation, progressively operate again according to above-mentioned steps; If the brightness value of each area L ED backlight of gained is littler than the standard value of setting, then increase the brightness of respective regions LED-backlit lamp, return the brightness data that step (2) reads each area L ED backlight of each brightness data Acquisition Circuit collection again then, carry out next one circulation, progressively operate again according to above-mentioned steps; If the brightness value of each area L ED backlight of gained equates with the standard value of setting, then directly return the brightness data that step (2) reads each area L ED backlight of each brightness data Acquisition Circuit collection again, carry out next one circulation, progressively operate again according to above-mentioned steps.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102194422A (en) * | 2011-06-10 | 2011-09-21 | 中航华东光电有限公司 | Control circuit of backlight module and control method thereof |
| CN103474032A (en) * | 2013-03-25 | 2013-12-25 | 彩虹集团公司 | Method and apparatus for adjusting white balance of direct-type three-color LED backlight |
| CN103561504A (en) * | 2013-08-23 | 2014-02-05 | 苏州康华净化系统工程有限公司 | Lighting system |
| CN105472848A (en) * | 2015-12-21 | 2016-04-06 | 天津焜日科技开发有限公司 | Brightness control apparatus |
| CN103500566B (en) * | 2013-09-29 | 2016-10-05 | 京东方科技集团股份有限公司 | Display device, display brightness inequality improve device and ameliorative way |
| CN106710565A (en) * | 2017-03-30 | 2017-05-24 | 国网福建省电力有限公司 | Correction method for liquid crystal display screen array |
| WO2020224387A1 (en) * | 2019-05-06 | 2020-11-12 | 京东方科技集团股份有限公司 | Drive method, drive apparatus, display device, and computer-readable medium |
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| CN101281730A (en) * | 2008-03-20 | 2008-10-08 | 青岛海信电器股份有限公司 | Liquid crystal display method |
| EP2141687A1 (en) * | 2007-04-23 | 2010-01-06 | Sony Corporation | Backlight apparatus, backlight control method, and liquid crystal display device |
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| CN1949037A (en) * | 2005-10-12 | 2007-04-18 | 三星电子株式会社 | Display apparatus and control method of the same |
| EP2141687A1 (en) * | 2007-04-23 | 2010-01-06 | Sony Corporation | Backlight apparatus, backlight control method, and liquid crystal display device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102194422A (en) * | 2011-06-10 | 2011-09-21 | 中航华东光电有限公司 | Control circuit of backlight module and control method thereof |
| CN103474032A (en) * | 2013-03-25 | 2013-12-25 | 彩虹集团公司 | Method and apparatus for adjusting white balance of direct-type three-color LED backlight |
| CN103561504A (en) * | 2013-08-23 | 2014-02-05 | 苏州康华净化系统工程有限公司 | Lighting system |
| CN103500566B (en) * | 2013-09-29 | 2016-10-05 | 京东方科技集团股份有限公司 | Display device, display brightness inequality improve device and ameliorative way |
| US9536498B2 (en) | 2013-09-29 | 2017-01-03 | Boe Technology Group Co., Ltd. | Apparatus and method for improving display device and uneven display brightness |
| CN105472848A (en) * | 2015-12-21 | 2016-04-06 | 天津焜日科技开发有限公司 | Brightness control apparatus |
| CN106710565A (en) * | 2017-03-30 | 2017-05-24 | 国网福建省电力有限公司 | Correction method for liquid crystal display screen array |
| WO2020224387A1 (en) * | 2019-05-06 | 2020-11-12 | 京东方科技集团股份有限公司 | Drive method, drive apparatus, display device, and computer-readable medium |
| US11270657B2 (en) | 2019-05-06 | 2022-03-08 | Beijing Boe Optoelectronics Technology Co., Ltd. | Driving method, driving apparatus, display device and computer readable medium |
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Application publication date: 20110330 |