CN100411008C - Method and device for adjusting display device brightness - Google Patents
Method and device for adjusting display device brightness Download PDFInfo
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- CN100411008C CN100411008C CNB2005100661912A CN200510066191A CN100411008C CN 100411008 C CN100411008 C CN 100411008C CN B2005100661912 A CNB2005100661912 A CN B2005100661912A CN 200510066191 A CN200510066191 A CN 200510066191A CN 100411008 C CN100411008 C CN 100411008C
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Abstract
The present invention provides a method and a device for adjusting brightness of a display device. The method comprises the following steps: firstly, collecting the brightness distribution of received partial picture image in the mode of statistic; then, judging the partial picture image is darker or lighter; afterwards, comparing backlight brightness with default value according to the darker partial picture image or the lighter partial picture image, which is used for adjusting the backlight brightness of the display device.
Description
Technical field
The present invention relates to a kind ofly, refer to a kind of method and device thereof of controlling display brightness especially about the flat-panel screens technical field.
Background technology
Along with the prosperity of electronic industry, portable type electronic product is full of gradually in life, for example: mobile phone, PDA(Personal Digital Assistant), MP3 player etc. at present.And in these portable type electronic products, can have a small display screen usually, its panel may be LCD (LCD), organic light emission flat-panel screens (OLED) or other common flat-panel screens.Yet the battery electric quantity of these portable type electronic products is limited usually, increases in order to make the battery Use Limitation, the brightness of display can be done appropriateness adjustment usually, to increase total system service time.
Generally speaking, the shown brightness of flat-panel screens is healed strong, represents institute's consumed current just big more.With the LCD is example, if under same GTG, brightness Qiang Ze more represents institute backlight consumed current big more; And for the organic light emission flat-panel screens, if under the single display pixel, required current sinking then can increase.
At present common method for controlling display brightness has following several: (a) reach power saving to count brightness reduction that automatically will be backlight after certain interruption service time or to close, but this kind mode can directly influence the picture overall brightness, and only can power saving when not operation; And the Luminance Distribution of (b) adding up picture in operation period, for example: when playing video,, then reduce backlight illumination if most GTG value of whole image concentrates on the dark partially zone of image (for example: GTG value major part is less than GTG value 50); Otherwise, if the GTG value of broadcasting pictures concentrates on the bright partially zone of image, then backlight illumination is kept normal condition, so that the human eye unsusceptibility reduces the image quality variation that is produced to brightness, yet this kind way is except needs statistics Luminance Distribution at present, still needing will see through picture frame impact damper (frame buffer) and store whole image, will make that so circuit design relative complex and system cost are higher.
Summary of the invention
The purpose of this invention is to provide a kind of method and device thereof of controlling display brightness, dynamically adjusting image contrast and brightness according to the Luminance Distribution of input image.
The purpose of this invention is to provide a kind of method and device thereof of controlling display brightness, so that brightness can gradually progressively be adjusted, to avoid the phenomenon of scene brightness flicker that discontinuous picture is produced.
The purpose of this invention is to provide a kind of method and device thereof of controlling display brightness, store whole image, so that circuit design is comparatively simple and can reduce system cost can need not to use picture to keep in impact damper (frame buffer).
According to a characteristic of the present invention, be to propose a kind of method of controlling display brightness, comprise following step: a receiving step is to receive a part of picture image; One statistics step is the Luminance Distribution of this part picture image of statistics; One comparison step is Luminance Distribution and the backlight illumination according to this part picture image, obtains a comparative result; And one adjust the backlight illumination step, is the backlight illumination of adjusting this display according to this comparative result.
According to another characteristic of the present invention, be to propose a kind of device of controlling display brightness, comprise: an imaging data stream statistic unit is to receive a part of picture image, and the Luminance Distribution of adding up this part picture image; One dynamic area computing module is to judge the brightness of this part picture image according to the Luminance Distribution of this part picture image, and judges whether backlight illumination meets this part picture image, to obtain a control signal; And a backlight pulse width modulation signaling control unit, be the backlight illumination of adjusting this display according to this control signal.
Because modern design of the present invention can provide on the industry and utilize, and truly have the enhancement effect, so apply for patent of invention in accordance with the law.
Description of drawings
Fig. 1 is the functional block diagram of preferred embodiment of the present invention.
Fig. 2 is the process flow diagram of a preferred embodiment of the present invention.
Fig. 3 is the process flow diagram of another preferred embodiment of the present invention.
The figure number explanation
Imaging data stream statistic unit 110 dynamic area computing modules 120
Backlight pulse width modulation signaling control unit 130
Digital analog converter 140 backlight modules 150
Embodiment
The present invention utilizes the high-brightness region ratio of statistics part image to reach.Just,, then turn down backlight illumination gradually, reduce to save power consumption backlight when the pixel quantity of continuous horizontal sweep trace hi-lite during less than a setting value.
Relevant preferred embodiment explanation of the present invention, please be with reference to the functional block diagram of Fig. 1 demonstration, it is to comprise imaging data stream statistic unit (video stream histogram unit) 110, dynamic area computing module (dynamic range calculation module) 120, backlight pulse width modulation signaling control unit 130, digital to analog converter (DAC) 140, backlight module 150 and contrast reinforcement unit 160.
Imaging data stream statistic unit 110 be in order to receive image information (R, G, B), for the part picture is carried out statistical treatment, to obtain the result who meets default value in the picture partly.120 of dynamic area computing modules receive the statisticses of imaging data stream statistic unit 110, and whether adjust processing backlight according to statistics, to obtain a control signal.Backlight pulse width modulation signaling control unit 130 is width (PW) of adjusting a PM signal (PWM) according to the control signal that dynamic area computing module 120 is exported, to adjust backlight illumination.140 PM conversion of signals with numeral of digital analog converter become simulating signal, with the brightness of control backlight module 150.Contrast reinforcement unit 160 is the R in order to the adjustment pixel, G, and the B value is to strengthen the contrast of picture.
In addition, it is a selectivity function unit that unit 160 is strengthened in contrast, in other embodiments, also can not add this function square.Again, in other embodiments, digital analog converter 140 also can be low pass filtering device, and (Low Pass Filter LPF) replaces.
Relevant of the present invention further specifying please be in the lump with reference to Fig. 1 and Fig. 2, and wherein Fig. 2 is the process flow diagram for a preferred embodiment of the present invention.At first, in step S205, imaging data stream statistic unit 110 receives partly picture image information.In present embodiment, partly picture image information is meant single horizontal scanning line.In other embodiments, partly picture image information can for half bar horizontal scanning line, plurality of pixels (for example: 200 points), some continuous horizontal sweep traces or section picture.In step S210, imaging data stream statistic unit 110 is the R that can find out each pixel, G, and the maximal value among the B (L), for example: the R of a certain pixel, G, the B value is respectively 50,100,160, then represents the maximum R of this pixel, G, B value (L) is 160.
In step S215, imaging data stream statistic unit 110 judges whether less than first default value (for example: 64), less than first default value, then represent this pixel dark partially as if this L value the L value.Number to inclined to one side dark pixel in step S220 is added up, to obtain a dark partially accumulated value SUM.Otherwise, if the L value greater than first default value, is then proceeded step S210.
In step S225, judge whether to finish the statistical treatment of this part image, if do not finish as yet, then continue to get back to step S210, to proceed the statistics of the dark partially number of pixel.Otherwise, if finished this partly statistics of image, then execution in step S230.
In step S230, dynamic area computing module 120 is to judge that whether the dark partially number SUM that adds up is greater than the second default value S
TH(for example: 500) and the width of this PM signal whether (minimum is allowed backlight illumination, for example: 88) greater than the 3rd default value PWmin.If, execution in step S235 then, if not, execution in step S240 then.
In step S235, represent that the inclined to one side dark pixel of this part picture image surpasses the second default value S
TH(500), and the width of PM signal greater than the 3rd default value PWmin.Just partly picture image is dark partially, but backlight illumination is brighter, therefore backlight illumination can be turned down a little.Reduce the width of PM signal this moment, to reduce the brightness of backlight module 150.
In step S240, judge that whether the dark partially number SUM that adds up is less than the second default value S
TH(500) and the width of this PM signal whether less than the 4th default value PWmax.If, execution in step S245 then, if not, execution in step S250 then.
In step S245, represent that the inclined to one side dark pixel of this part picture image does not surpass the second default value S
TH(500), and the width of PM signal less than the 4th default value PWmax.Just partly picture image is bright partially, but backlight illumination is darker, therefore backlight illumination can be increased a little.Increase the width of PM signal this moment, to promote the brightness of backlight module 150.
At last, behind the width of adjusting the PM signal, be execution in step S250, to export the PM signal, with the brightness of control backlight module 150 to digital analog converter 140.So can reach difference, and can dynamically adjust backlight illumination, and reach the power consumption of reduction system with the broadcasting pictures influence.
The above embodiments are main based on the dim spot number in the statistics part image, certainly in other embodiments, also can utilize the bright spot number in the statistics part image to be the basis.
Fig. 3 is the process flow diagram of another preferred embodiment of the present invention.Wherein step S305～S325, S350～S360 major part be with Fig. 2 in step S205～S225, S230～S250 similar, therefore no longer be illustrated at this.But in this embodiment, step S330 judges whether greater than the 5th default value (for example: 196), greater than the 5th default value, then represent this pixel bright partially as if the L value L value.So step S330 is the number of the inclined to one side bright spot of statistics.
In step S340, judge the dark partially number SUM1 add up whether greater than the bright partially number SUM2 that adds up, the partially secretly number SUM that adds up whether greater than the second default value S
TH(500) and the width of this PM signal whether greater than the 3rd default value PWmin.If all set up, represent that the number of the inclined to one side dim spot of this part image is more, reduce the width of PM signal this moment, to reduce the brightness (step S350) of backlight module 150.
In step S345, judge the bright partially number SUM2 add up whether greater than the partially secretly number SUM1 that adds up, the bright partially number SUM2 that adds up whether greater than the second default value S
TH(500) and the width of this PM signal whether less than the 4th default value PWmax, if all set up, represent that the number of the inclined to one side bright spot of this part image is more, increase the width of PM signal this moment, with the brightness (step S355) of lifting backlight module 150.
By above explanation as can be known, the present invention dynamically adjusts image contrast and brightness according to the Luminance Distribution of input image, in addition, be to adopt progressively to adjust when adjusting backlight illumination, the picture brightness flicker takes place in the time of so can avoiding scene discontinuous, and the present invention need not to use the temporary impact damper of picture just can reach above-mentioned effect, makes that not only comparatively simple the and cost of circuit can be lower.
Above-mentioned preferred embodiment only is to give an example for convenience of description, and the protection domain that the present invention advocated should be as the criterion so that claim of the present invention is described certainly, but not only limits to the foregoing description.
Claims (18)
1. a method of controlling display brightness is characterized in that, comprises following step:
One receiving step receives a part of picture image;
One statistics step, the Luminance Distribution of adding up this part picture image;
One comparison step, Luminance Distribution and backlight illumination according to this part picture image obtain a comparative result, and wherein this backlight illumination is with the width means of a PM signal; And
One adjusts the backlight illumination step, adjusts the backlight illumination of this display according to this comparative result.
2. the method for claim 1 is characterized in that, this part picture image is a plurality of pixels.
3. the method for claim 1 is characterized in that, this part picture image is a section picture.
4. the method for claim 1 is characterized in that, in this statistic procedure, adds up the dim spot number of this part picture image.
5. the method for claim 1 is characterized in that, in this statistic procedure, adds up the bright spot number of this part picture image.
6. the method for claim 1 is characterized in that, in this statistic procedure, also comprises the maximum R that finds out each pixel, G, and the B value then relatively should maximum R, G, B value and one first default value.
7. the method for claim 1 is characterized in that, in this comparison step, comes comparison one second default value according to the Luminance Distribution of this part picture image, to judge the brightness of this part picture image.
8. method as claimed in claim 7 is characterized in that, if the Luminance Distribution of this part picture image is dark partially, and this backlight illumination is then adjusted in backlight illumination step the reduction backlight illumination in this greater than one the 3rd default value.
9. method as claimed in claim 7 is characterized in that, if the Luminance Distribution of this part picture image is bright partially, and this backlight illumination is then adjusted in backlight illumination step the increase backlight illumination in this less than one the 4th default value.
10. a device of controlling display brightness is characterized in that, comprises:
One imaging data stream statistic unit receives a part of picture image, and adds up the Luminance Distribution of this part picture image;
One dynamic area computing module, judge the brightness of this part picture image according to the Luminance Distribution of this part picture image, and judge whether backlight illumination meets this part picture image, to obtain a control signal, wherein this backlight illumination is with the width means of a PM signal; And
One backlight pulse width modulation signaling control unit is adjusted the backlight illumination of this display according to this control signal.
11. device as claimed in claim 10 is characterized in that, this part picture image is a plurality of pixels.
12. device as claimed in claim 10 is characterized in that, this part picture image is a section picture.
13. device as claimed in claim 10 is characterized in that, this imaging data stream statistic unit is added up the dim spot number of this part picture image.
14. device as claimed in claim 10 is characterized in that, this imaging data stream statistic unit is added up the bright spot number of this part picture image.
15. device as claimed in claim 10 is characterized in that, this imaging data stream statistic unit is found out the maximum R of each pixel by this part picture image, G, and the B value then relatively should maximum R, G, B value and one first default value.
16. device as claimed in claim 10 is characterized in that, this dynamic area computing module comes comparison one second default value according to the Luminance Distribution of this part picture image, to judge the brightness of this part picture image.
17. device as claimed in claim 16 is characterized in that, if partly the Luminance Distribution of picture image is dark partially for this, and this backlight illumination is greater than one the 3rd default value, and then this dynamic area computing module output one reduces the control signal of backlight illumination.
18. device as claimed in claim 16 is characterized in that, if partly the Luminance Distribution of picture image is bright partially for this, and this backlight illumination is less than one the 4th default value, and then this dynamic area computing module output one increases the control signal of backlight illumination.
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| CNB2005100661912A CN100411008C (en) | 2005-04-21 | 2005-04-21 | Method and device for adjusting display device brightness |
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| CNB2005100661912A CN100411008C (en) | 2005-04-21 | 2005-04-21 | Method and device for adjusting display device brightness |
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| CN100411008C true CN100411008C (en) | 2008-08-13 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295467B (en) * | 2007-04-29 | 2011-06-01 | 瑞昱半导体股份有限公司 | Contrast control device and control method thereof |
| CN101463963B (en) | 2007-12-21 | 2010-09-29 | 富士迈半导体精密工业（上海）有限公司 | Illumination system |
| CN101686590B (en) * | 2008-09-27 | 2013-01-30 | 比亚迪股份有限公司 | LED dynamic backlight source control algorithm |
| CN102290035B (en) * | 2011-08-01 | 2013-05-08 | 深圳创维－Rgb电子有限公司 | Method and device for dynamically adjusting backlight of television screen, and television |
| CN104064163B (en) * | 2014-06-24 | 2017-09-01 | 中科创达软件股份有限公司 | The control method and device of a kind of brightness of display screen |
| CN106293059B (en) * | 2016-07-21 | 2020-01-10 | Oppo广东移动通信有限公司 | Control method and control device |
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| WO2004010208A1 (en) * | 2002-07-19 | 2004-01-29 | Samsung Electronics Co., Ltd. | A liquid crystal display |
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| US6144359A (en) * | 1998-03-30 | 2000-11-07 | Rockwell Science Center | Liquid crystal displays utilizing polymer dispersed liquid crystal devices for enhanced performance and reduced power |
| EP1223570A2 (en) * | 2000-12-29 | 2002-07-17 | Samsung Electronics Co. Ltd. | Apparatus and method for automatic brightness control of the backlight for use in a liquid crystal display device |
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Effective date of registration: 20180103 Address after: No. 9, 2 gate, 41 floor, North Tower, Linxi long Jiangxi Li machine factory, Guye District, Tangshan City, Hebei Patentee after: Ban Xiuqin Address before: Science and Industry Park, Taiwan, Hsinchu, China, No. 19 Patentee before: Sunplus Technology Co.,Ltd. |
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Effective date of registration: 20220906 Address after: 101d1-7, 1st floor, building 1, No. 6, Shangdi West Road, Haidian District, Beijing 100085 Patentee after: Beijing Dajia Internet Information Technology Co.,Ltd. Address before: 063100 No.9, door 2, 41 / F, North building, Jiangxi Liji factory, linxilong, Guye District, Tangshan City, Hebei Province Patentee before: Ban Xiuqin |
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