CN100527205C - Lighteness adjusting apparatus and method thereof - Google Patents
Lighteness adjusting apparatus and method thereof Download PDFInfo
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- CN100527205C CN100527205C CNB2006100682059A CN200610068205A CN100527205C CN 100527205 C CN100527205 C CN 100527205C CN B2006100682059 A CNB2006100682059 A CN B2006100682059A CN 200610068205 A CN200610068205 A CN 200610068205A CN 100527205 C CN100527205 C CN 100527205C
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- backlight
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Abstract
This invention relates to one brightness adjust device in small display system to adjust input visual frequency sequence and to send the ith image frame to output brightness, which comprises light sense module, memory unit, image process module and aphototropism module, wherein, the light sensor module is to sense current environment light; memory unit is to store comparison list to record multiple environment lights with each one responding multiple brightness rate and multiple aphototropism adjust parameters; the image process module is to compute ith image frame brightness express rate.
Description
Technical field
The present invention relates to a kind of brightness adjusting device and method thereof, particularly adjust the brightness adjusting device and the method thereof of the output brightness of the input video sequence (Video sequence) in the display system (Display system).
Background technology
(Liquid crystal display, brightness LCD) is to be produced by backlight module to the available liquid crystal display, by reversing of control liquid crystal, can change transmissivity backlight, with the brightness of decision video.At present, (Cold cathode fluorescent lamp is main CCFL) to the display packing of LCD with cathode fluorescent tube mostly.When the user under darker surround lighting, when using LCD to view and admire bright picture, can be too strong, and make eyes not feel well because of light.When using LCD to view and admire dark picture, because brightness backlight is constant brightness, so the contrast of whole picture can descend.
Formerly in the skill, existing LCD utilizes optical sensor (Light sensor) sense ambient light, and then along with backlight illumination is adjusted in the variation of surround lighting.Yet above-mentioned Prior Art is only adjusted backlight at surround lighting, and the bright of groundless picture secretly adjusts.Also partially secretly the time, contrast still can descend, and then influences the display effect of video for dark and picture when surround lighting.
Therefore, category of the present invention is to provide a kind of brightness adjusting device and method thereof, to address the above problem.
Summary of the invention
One of category of the present invention is to provide a kind of brightness adjusting device and method thereof, and this brightness adjusting device is bright dark according to the variation of surround lighting and picture frame simultaneously, adjusts the output backlight illumination of picture frame.By this, can obtain preferable video quality.
According to a preferred embodiment, in display system (Display system) input one input video sequence (Video sequence), this input video sequence comprises N picture frame (Image frame), and N is a natural number.Brightness adjusting device of the present invention is in order in display system, adjusts the output backlight illumination of i picture frame in the input video sequence, and i is the integer index in 1 to the N scope.Brightness adjusting device comprises optical sensing module (Light sensing module), storage unit (Memory unit), image processing module (Image processing module) and backlight module (Backlightmodule).
In the above-described embodiment, optical sensing module is in order to the present surround lighting of sensing (Environmentallight).Storage unit is in order to store the table of comparisons (Look-up table), this table of comparisons is noted down a plurality of surround lightings, each surround lighting corresponds respectively to a plurality of brightness representation rates (Brightness ratio) and a plurality of adjustment parameters backlight (Parameter), and all one of them is corresponding with these brightness representation rates for each adjustment parameter backlight.Image processing module is in order to receiving present surround lighting, to calculate the present brightness representation rate of i picture frame, and according to present surround lighting, the brightness representation rate and the table of comparisons at present, decision and the corresponding adjustment parameter backlight of brightness representation rate at present.Backlight module is in order to the backlight adjustment parameter of reception corresponding to present brightness representation rate, and adjusts the output backlight illumination of i picture frame according to this.
Therefore, brightness adjusting device of the present invention is bright dark according to the variation of surround lighting and picture frame simultaneously, adjusts the output backlight illumination of picture frame, and then, can effectively improve picture and contrast when dark and picture is also dark partially at surround lighting.By this, can obtain preferable video quality.
Can be further understood by the following detailed description and accompanying drawings about the advantages and spirit of the present invention.
Description of drawings
Fig. 1 is the functional block diagram that illustrates according to the brightness adjusting device of a preferred embodiment of the present invention;
Fig. 2 is the synoptic diagram that illustrates the table of comparisons among Fig. 1; And
Fig. 3 is the process flow diagram according to the luminance regulating method of a preferred embodiment of the present invention.
The reference numeral explanation
1: brightness adjusting device 10: input video sequence
12: optical sensing module 14: A/D converter
16: storage unit 160: the table of comparisons
18: image processing module 20: D/A
22: backlight module 24: display module
EL
1-EL
16: surround lighting BR
1-BR
6: the brightness representation rate
P
11-P
16, P
21-P
26, P
161-P
166: adjustment parameter backlight
S100-S106: process step.
Embodiment
See also Fig. 1, Fig. 1 is the functional block diagram that illustrates according to the brightness adjusting device 1 of a preferred embodiment of the present invention.In this embodiment, input video sequence (Video sequence) can input to display system (Display system) (not shown), and wherein, input video sequence comprises N picture frame (Image frame), and N is a natural number.Brightness adjusting device 1 of the present invention is in order in the display system (not shown), adjusts the output backlight illumination of i picture frame in the input video sequence 10, and i is the integer index in 1 to the N scope.Input video sequence 10 is to meet rgb color space or other color space.
As shown in Figure 1, brightness adjusting device 1 comprises optical sensing module (Light sensing module) 12, A/D converter (Analog to digital converter, AD converter) 14, storage unit (Memory unit) 16, image processing module (Image processing module) 18, D/A (Digital to analog converter, DA converter) 20, backlight module (Backlightmodule) 22 and display module (Display module) 24.
In this embodiment, optical sensing module 12 is in order to the present surround lighting of sensing (Environmentallight).Because the present surround lighting of 12 sensings of optical sensing module is a simulating signal, A/D converter 14 is in order to being digital signal with present surround lighting by analog signal conversion.
See also Fig. 2, Fig. 2 is the synoptic diagram that illustrates the table of comparisons 160 among Fig. 1.Storage unit 16 is in order to store the table of comparisons (Look-up table) 160.The a plurality of surround lighting EL# of the table of comparisons 160 records, each surround lighting EL# corresponds respectively to a plurality of brightness representation rates (Brightness ratio) BR# and a plurality of adjustment parameters backlight (Parameter) P#, and all one of them is corresponding with these brightness representation rates BR# for each adjustment parameter P# backlight.As shown in Figure 2,16 surround lighting EL of the table of comparisons 160 records
1-EL
16, each surround lighting EL
1-EL
16Correspond respectively to 6 brightness representation rates (Brightness ratio) BR
1-BR
6And 6 adjustment parameters backlight (Parameter) P
11-P
16, P
21-P
26..., P
161-P
166
Image processing module 18 is in order to receive the present surround lighting after A/D converter 14 conversions.Simultaneously, the present brightness representation rate of i picture frame of input video sequence 10 is calculated in image processing module 18 meetings, and determines and the present corresponding adjustment parameter backlight of brightness representation rate according to the present surround lighting that receives, present brightness representation rate and the table of comparisons 160.Because the adjustment parameter backlight that image processing module 18 is determined is a digital signal, so D/A 20 can be converted to simulating signal by digital signal with adjustment parameter backlight.Backlight module 22 is in order to the backlight adjustment parameter of the correspondence of reception after D/A 20 conversions in present brightness representation rate, and adjusts the output backlight illumination of i picture frame according to this.At last, display module 24 shows i picture frame of input video sequence 10 by adjusted output backlight illumination.
For example, if the present surround lighting that optical sensing module 12 senses is EL
2, and the present brightness representation rate of i picture frame is BR
4, then image processing module 18 can be according to present surround lighting EL
2, present brightness representation rate BR
4And the table of comparisons 160, decision and present brightness representation rate BR
4Corresponding adjustment parameter P backlight
24Then, backlight module 22 can be according to adjustment parameter P backlight
24Adjust the output backlight illumination of i picture frame.At last, display module 24 shows i picture frame of input video sequence 10 by adjusted output backlight illumination.By this, brightness adjusting device 1 of the present invention be can be simultaneously bright dark according to the variation of surround lighting and picture frame, adjust the output backlight illumination of picture frame, and then when dark and picture is also dark partially, can effectively improves picture and contrast at surround lighting.
In some display system, the picture frame of input video sequence 10 can be earlier through the Gamma conversion, to strengthen the contrast of picture before being shown in display module 24.
See also Fig. 3, Fig. 3 is the process flow diagram according to the luminance regulating method of a preferred embodiment of the present invention.See also Fig. 1 to Fig. 2, luminance regulating method of the present invention is to be used in the display system, adjusts the output backlight illumination of i picture frame in the input video sequence.According to the first above-mentioned preferred embodiment, luminance regulating method of the present invention comprises the following step:
Step S100: the present surround lighting of sensing;
Step S102: calculate the present brightness representation rate of i picture frame, and according to present surround lighting, present brightness representation rate and the table of comparisons 160, decision and the present corresponding adjustment parameter backlight of brightness representation rate;
Step S104:, adjust the output backlight illumination of i picture frame according to adjustment parameter backlight corresponding to present brightness representation rate;
Step S106:, show i picture frame of input video sequence by adjusted output backlight illumination.
Compared to Prior Art, brightness adjusting device of the present invention be can be simultaneously bright dark according to the variation of surround lighting and picture frame, adjust the output backlight illumination of picture frame, and then when dark and picture is also dark partially, can effectively improves picture and contrast at surround lighting.By this, can obtain preferable video quality.
By the above detailed description of preferred embodiments, be to wish to know more to describe feature of the present invention and spirit, and be not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category of claim of being arranged in of various changes and tool equality institute of the present invention desire application.Therefore, the category of the claim that the present invention applied for should be done the broadest explanation according to above-mentioned explanation, contains the arrangement of all possible change and tool equality to cause it.
Claims (10)
1. brightness adjusting device, import an input video sequence in a display system, this input video sequence comprises N picture frame, this brightness adjusting device is in order in this display system, adjust an output backlight illumination of i picture frame in this input video sequence, N is a natural number, and i is the integer pointer in 1 to the N scope, and this brightness adjusting device comprises:
One optical sensing module is in order to sensing one present surround lighting;
One storage unit, in order to store comparison list, this table of comparisons is noted down a plurality of surround lightings, and each described surround lighting corresponds respectively to a plurality of brightness representation rates and a plurality of adjustment parameter backlight, and all one of them is corresponding with described brightness representation rate for each described adjustment parameter backlight;
One image processing module, in order to receive this present surround lighting, calculate a present brightness representation rate of this i picture frame, and according to this present surround lighting, this present brightness representation rate and this table of comparisons, and determine and corresponding this adjustment parameter backlight of this present brightness representation rate; And
One backlight module in order to receiving this adjustment parameter backlight corresponding to this present brightness representation rate, and is adjusted this output backlight illumination of this i picture frame according to this.
2. brightness adjusting device as claimed in claim 1, further comprise an A/D converter, be coupled between this optical sensing module and this image processing module, this A/D converter is a digital signal in order to the analog signal conversion with this optical sensing module output.
3. brightness adjusting device as claimed in claim 1, further comprise a D/A, be coupled between this image processing module and this backlight module, this D/A is converted to a simulating signal in order to the digital signal with this image processing module output.
4. brightness adjusting device as claimed in claim 1 further comprises a display module, in order to show this i picture frame of this input video sequence by this adjusted output backlight illumination.
5. brightness adjusting device as claimed in claim 4, wherein, this i picture frame can be earlier through the Gamma conversion, to strengthen the contrast of picture before being shown in this display module.
6. brightness adjusting device as claimed in claim 1, wherein, this input video sequence meets rgb color space.
7. luminance regulating method, import an input video sequence in a display system, this input video sequence comprises N picture frame, this luminance regulating method is in order in this display system, adjust an output backlight illumination of i picture frame in this input video sequence, N is a natural number, and i is the integer pointer in 1 to the N scope, and this luminance regulating method comprises the following step:
Sensing one present surround lighting;
Calculate a present brightness representation rate of this i picture frame and according to this present surround lighting, this present brightness representation rate and comparison list, decision and this present brightness representation rate corresponding one adjustment parameter backlight, wherein, this table of comparisons is noted down a plurality of surround lightings, each described surround lighting corresponds respectively to a plurality of brightness representation rates and a plurality of adjustment parameter backlight, and all one of them is corresponding with described brightness representation rate for each described adjustment parameter backlight; And
According to this adjustment parameter backlight, adjust this output backlight illumination of this i picture frame corresponding to this present brightness representation rate.
8. luminance regulating method as claimed in claim 7 further comprises the following step:
By this adjusted output backlight illumination, show this i picture frame of this input video sequence.
9. luminance regulating method as claimed in claim 8, wherein, this i picture frame can be earlier through the Gamma conversion, to strengthen the contrast of picture before being shown.
10. luminance regulating method as claimed in claim 7, wherein, this input video sequence meets rgb color space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100682059A CN100527205C (en) | 2006-03-20 | 2006-03-20 | Lighteness adjusting apparatus and method thereof |
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|---|---|---|---|
| CNB2006100682059A CN100527205C (en) | 2006-03-20 | 2006-03-20 | Lighteness adjusting apparatus and method thereof |
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| CN100527205C true CN100527205C (en) | 2009-08-12 |
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| US8400385B2 (en) | 2007-12-21 | 2013-03-19 | Hong Kong Applied Science and Technology Research Institute Company Limited | Method for enhancing an image displayed on an LCD device |
| WO2009086742A1 (en) * | 2008-01-11 | 2009-07-16 | Hong Kong Applied Science and Technology Research Institute Co. Ltd | Method and apparatus for enhancing an image displayed on an lcd device |
| US8400393B2 (en) * | 2008-03-27 | 2013-03-19 | Himax Technologies Limited | Method of controlling backlight module, backlight controller and display device using the same |
| CN101833926A (en) | 2009-03-13 | 2010-09-15 | 群康科技(深圳)有限公司 | Back light adjusting system and method |
| US8890793B2 (en) * | 2010-03-26 | 2014-11-18 | Hong Kong Applied Science and Technology Research Institute, Co. Ltd. | Adjusting a brightness level of a backlight of a display device |
| CN104240678B (en) * | 2013-06-17 | 2017-12-29 | 华为终端（东莞）有限公司 | Adjust the method and apparatus and terminal of screen backlight brightness |
| CN103345907A (en) * | 2013-07-19 | 2013-10-09 | 国家电网公司 | Automatic regulator of LED backlight optical parameters based on ambient light detection |
| KR102076312B1 (en) * | 2013-08-21 | 2020-03-18 | 삼성디스플레이 주식회사 | Display device |
| CN103531174B (en) * | 2013-10-29 | 2017-12-08 | 京东方科技集团股份有限公司 | Brightness adjusting device and method |
| CN104078012A (en) * | 2014-07-25 | 2014-10-01 | 上海工程技术大学 | Brightness adjustment circuit based on Raspberry Pi |
| CN105528998B (en) * | 2014-09-28 | 2019-07-26 | 联想(北京)有限公司 | Bias light drive module and electronic equipment |
| CN104318912B (en) * | 2014-10-23 | 2017-02-01 | 赵辉 | Method and device for detecting environmental light brightness |
| CN104882097B (en) * | 2015-06-08 | 2017-11-21 | 西安电子科技大学 | Method for displaying image and system based on ambient light |
| CN105489192B (en) * | 2016-01-25 | 2018-02-23 | 明基电通有限公司 | Display and its image regulating method with image self-optimization function |
| TWI568266B (en) | 2016-01-27 | 2017-01-21 | 明基電通股份有限公司 | Image adjusting method and related displaying apparatus |
| CN105489193B (en) * | 2016-01-29 | 2018-08-24 | 明基智能科技（上海）有限公司 | Image regulating method and display equipment |
| CN105632447B (en) * | 2016-03-31 | 2018-05-18 | 青岛海信移动通信技术股份有限公司 | The display brightness method of adjustment and device of a kind of liquid crystal display |
| CN106782402A (en) * | 2017-01-20 | 2017-05-31 | 合肥市传秀声光科技有限公司 | A kind of LCDs of optoelectronic integration |
| US10770028B2 (en) * | 2017-04-12 | 2020-09-08 | Lenovo (Singapore) Pte. Ltd. | Display brightness adjustment based on ambient light level |
| CN108845779B (en) * | 2018-06-19 | 2021-08-20 | 环鸿电子（昆山）有限公司 | Electronic device for adjusting brightness based on image gray scale and brightness adjusting method thereof |
| CN109243383B (en) * | 2018-11-09 | 2021-12-17 | 珠海格力电器股份有限公司 | Backlight brightness adjusting method of display screen and display screen device |
| CN109739609B (en) * | 2019-01-03 | 2021-01-15 | 腾讯科技（深圳）有限公司 | Image processing method, image processing device, computer-readable storage medium and computer equipment |
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