CN101673530A - Method for integrally adjusting light of LED backlight and device thereof - Google Patents
Method for integrally adjusting light of LED backlight and device thereof Download PDFInfo
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- CN101673530A CN101673530A CN200910309165A CN200910309165A CN101673530A CN 101673530 A CN101673530 A CN 101673530A CN 200910309165 A CN200910309165 A CN 200910309165A CN 200910309165 A CN200910309165 A CN 200910309165A CN 101673530 A CN101673530 A CN 101673530A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention relates to a method for integrally adjusting the light of an LED backlight, which is characterized of comprising the steps of: firstly presetting the light-adjusting distortion degree ofthe backlight, and compressing the image dynamic range according to the distortion degree to be limited in a small area; secondly stretchy compensating the image, and counting backlight compensatingfactor with a predict method; and finally integrally judging the outer illumination and the backlight compensating factor to output backlight light-adjusting parameters. According to the method, the invention also provides a device for integrally adjusting the light of the LED backlight, comprising an LED backlight light-adjusting parameters setting interface, wherein the device is characterized in that the interface is sequentially connected with a video acquiring unit and an image preprocessing unit, an image dynamic compressing unit and a stretchy processing unit, and a backlight illumination judging unit and a backlight light adjusting unit. The invention can control the illumination of the LED backlight according to the characteristic of the display image, thereby not only having higher display quality, but also having good energy saving effect.
Description
Technical field
The present invention relates to liquid crystal indicator, particularly a kind of method and device thereof that is used for the LED-backlit source integrally adjusting light of liquid crystal indicator belongs to field of liquid crystal display and backlight field, also belongs to video image and handles and the control field.
Background technology
The LED-backlit source has long (100,000 hours), excitation height, color reproduction rate height, brightness height of life-span, is not afraid of low temperature, advantages such as adaptability is strong, good reliability, no mercury pollution, will occupy critical role in the LCD in future backlight field.At present the small size liquid crystal panel widespread use LED as backlight, day by day ripe at back light source structure such as the design of aspects such as leaded light, diffuse reflection.But in the liquid crystal display module, the highest more than 50% of total power consumption that accounts for of the power consumption of backlight.Especially in showing product such as mobile phone, portable sets such as PDA, MP3 below 10 inches, adopt powered battery substantially, power problems is particularly outstanding.
At present also there is not perfect solution in the LED-backlit source aspect drives, and the research that improves image quality and aspect such as energy-conservation in dynamic modulation etc. simultaneously as yet not deeply and has not influenced the development of this technology and perfect.Have only minority major company such as Philip, Sony, Samsung, CPTF etc. to grasp the partial monopoly technology at present.Especially dynamic backlight modulation is the technology that present liquid crystal panel factory generally drops into focus development, also is a technological growth point in LED-backlit source.The dynamic distinguishing image of this technology utilization allows the picture full wafer become brighter or darker, improves contrast.It is reported, use this technology, can make correlative value rise to 10,000: 1, also can reduce consumed power simultaneously.Be to realize more outstanding complete machine performance, begun to obtain people's attention based on the backlight light-adjusting method of image processing method.Its objective is do not lose on the basis of human eye to the display image perceived effect as far as possible,, reduce backlight illumination as far as possible, thereby realize better energy-efficient performance according to shown image self characteristics.
Summary of the invention
Deficiency in view of above-mentioned technology, a purpose of the present invention provides the method for a kind of LED-backlit source integrally adjusting light, another purpose provides a kind of LED-backlit source integrally adjusting light device of realizing according to said method, its function is at the side LED-backlit backlight source or end LED-backlit backlight source, and the realization energy-conservation while of backlight is not reduced image displaying quality.
For achieving the above object, the present invention adopts following scheme to realize: the method for a kind of LED-backlit source integrally adjusting light is characterized in that: at first default backlight light-adjusting degree of distortion, according to degree of distortion dynamic range of images is compressed, and make it to be limited in than the zonule; Image carried out stretch compensation, and adopt Forecasting Methodology to calculate backlight compensating factor thereafter; Extraneous brightness of last comprehensive distinguishing and backlight compensating factor, the output backlight light-adjusting parameters.
A kind of LED-backlit source integrally adjusting light device of realizing according to said method, comprise that light modulation parameter in LED-backlit source is provided with interface, is characterized in that: described LED-backlit source light modulation parameter is provided with interface and is connected with that video obtains and image pretreatment unit, image dynamic compression and stretch processing unit, back light source brightness judgement unit and backlight light-adjusting unit in turn; The input end of described back light source brightness judgement unit is connected with extraneous brightness collecting unit, and one of its output terminal is connected with image dynamic compression and stretch processing unit.
The invention has the beneficial effects as follows: the present invention carries out brilliance control according to the characteristics of display image to the LED-backlit source, compression degree to dynamic range of images when dark images is bigger, can obtain bigger stretching yardstick, corresponding back light source brightness can reduce by a relatively large margin, realizes purpose of energy saving; In addition, the present invention also to external world brightness detect, keep brighter back light source brightness in the time of, the more difficult recognition image of human eye higher when extraneous brightness, make image totally present display quality preferably.
Above-mentioned and other features of the present invention, advantage do to describe in further detail by the following drawings and embodiment.
Description of drawings
Fig. 1 forms logic diagram for LED-backlit of the present invention source integrally adjusting light device.
Fig. 2 obtains for video of the present invention and the image pretreatment unit is formed logic diagram.
Fig. 3 is a LED-backlit of the present invention source integrally adjusting light process flow diagram.
Embodiment
In preferred embodiment of the present invention, the invention provides the method for a kind of LED-backlit source integrally adjusting light, it is characterized in that: at first default backlight light-adjusting degree of distortion, according to degree of distortion dynamic range of images is compressed, make it to be limited in than the zonule; Image carried out stretch compensation, and adopt Forecasting Methodology to calculate backlight compensating factor thereafter; Extraneous brightness of last comprehensive distinguishing and backlight compensating factor, the output backlight light-adjusting parameters.
The method of described compression comprises reduced overall method or high-brightness region compression method.The present invention herein takes the background luminance factor into account when image being compressed and stretch, utilize bright area and the dark areas relative insensitivity of human eye to image background, and to the more sensitive characteristic of medium luminance area, many reservation human eyes sensitizing range pixel, and remove the pixel in the insensitive zone of human eye more.
The different grey-scale composition that comprises in the precipitous image histogram peak region is less, and low frequency component is than horn of plenty.Otherwise, in the histogram comparatively flat portions normally comprise the high complexity image-region that enriches gray level, they have abundant edge and lines, are the visual focuses of human eye.Therefore the present invention keeps histogram flat site pixel more when dynamic range of images being compressed and stretch, and removes the pixel in precipitous zone more.
In calculating, backlight compensating factor adds prediction link backlight, according to the compensating factor of current compensating factor prediction next frame image.
Please refer to Fig. 1, Fig. 1 forms logic diagram for LED-backlit of the present invention source integrally adjusting light device, this device is the LED-backlit source integrally adjusting light device of realizing according to said method, comprise that light modulation parameter in LED-backlit source is provided with interface, is characterized in that: described LED-backlit source light modulation parameter is provided with interface 11 and is connected with that video obtains and image pretreatment unit 12, image dynamic compression and stretch processing unit 13, back light source brightness judgement unit 15 and backlight light-adjusting unit 16 in turn; The input end of described back light source brightness judgement unit 15 is connected with extraneous brightness collecting unit 14, and one of its output terminal is connected with image dynamic compression and stretch processing unit 13.
The user is provided with interface 11 by LED-backlit source light modulation parameter and selects degree of distortion and algorithm types.The degree of distortion parameter can be selected backlight is carried out manually or automatically regulating, and algorithm types can be selected reduced overall method and high-brightness region compression method.Obtain and image pretreatment unit 12 obtains video image by video, after pre-service, send into image dynamic compression and stretch processing unit 13.Processing unit 13 is handled image according to the parameter that interface 11 is set, and output light modulation parameter is to back light source brightness judgement unit 15.Extraneous brightness collecting unit 14 is gathered the external environment luminance brightness, and output ambient light brightness degree is to back light source brightness judgement unit 15.Back light source brightness judgement unit 15 carries out comprehensive distinguishing according to the output of processing unit 13 and processing unit 14, if do not satisfy preset requirement, then feed back to processing unit 13 and recomputate, then export backlight light-adjusting unit 16 to and carry out the LED-backlit brightness degree and regulate if meet the demands.
Concrete, light modulation parameter in LED-backlit source is provided with the selection that interface 11 provides degree of distortion and algorithm types.Degree of distortion is selected to select manual mode or automatic mode.The degree of distortion of the predeterminable backlight of manual mode, wherein degree of distortion is defined as compressed number of pixels and total pixel number purpose ratio in the dynamic range of images; The implementation method of automatic mode is for getting compromise between degree of distortion and display quality, concrete value is a degree of distortion with the variation of the image dynamic compression scope maximum point of transferring.The selection that 11 pairs of algorithm types of interface are set comprises reduced overall method and high-brightness region compression method, if select the reduced overall method for use, carries out simultaneously from image high-brightness region and low brightness area when then dynamic range of images compresses; If select the high-brightness region compression method for use, then the compression of dynamic range of images only limits to high-brightness region.
Video obtains and image pretreatment unit 12 provides the acquisition function of video and carry out pre-service to gathering video image.Wherein the Flame Image Process object comprises R, G, B three looks in the colour-video signal, and various conversion are preferred object with this look disposal route of distortion minimum.Video obtain and the image pretreatment unit by device hardware system real-time implementation, as shown in Figure 2, specific implementation comprises a video acquisition unit 21, the numeral of reception main frame output or analog video signal, pixel synchronizing signal, field sync signal, line synchronizing signal, vision signal deposits frame memory 22 or 23 under the synchronizing signal effect.Frame memory 22 and 23 is taked two buffer memory switching modes, and promptly every video deposits a storer in, and another storer is used for exporting simultaneously a field picture to dynamic range of images arithmetical unit 24.Native system is realized quasi real time transmission of video images and processing, because the dynamic range conversion of video image is often comparatively slow, takes Twin Cache Architecture to help keeping the previous frame image in addition, and to realize the feedback arrangement among Fig. 1, therefore quasi real time system is rational.Image operation device 24 receives image digitization dot matrix and computed image dynamic range, through transferring to image dynamic compression and stretch processing unit 13 after the digitized filtered pre-service.
Image dynamic compression and stretch processing unit 13 compress dynamic range of images according to the image fault degree, algorithm flow chart as shown in Figure 3, wherein degree of distortion is defined as compressed number of pixels and total pixel number purpose ratio in the image, and its image is limited in than the zonule.Concrete grammar comprises reduced overall method and high-brightness region compression method, by LED-backlit source light modulation parameter interface 11 is set and selects.If select the reduced overall method for use, then the compression of dynamic range of images is carried out simultaneously by high-brightness region and low brightness area, and moves after compression to low brightness area; If select the high-brightness region compression method for use, then the compression to dynamic range of images only limits to high-brightness region, does not carry out integral image and moves.Dynamic range of images is stretched to full amplitude in the stretch processing step, and calculates the backlight compensating factor in conjunction with performance prediction, and compensating factor is directly proportional with stretch range.Forecasting Methodology specifically takes the Kalman to predict or the particle filter method.The backlight compensating factor exports back light source brightness judgement unit 15 to.
Extraneous brightness collecting unit 14 is gathered the external environment luminance brightness, is divided into some grades such as high light, intermediate light, faint light, exports back light source brightness judgement unit 15 to.
Back light source brightness judgement unit 15 carries out comprehensive distinguishing according to the output of processing unit 13 and processing unit 14, and the differentiation process can be embodied as shown in Figure 3.If regulate automatically, if then external environment light is high light, the reduction of LED-backlit brightness will influence visual effect, then close the LED-backlit brightness control function; If ambient light is an intermediate light, then LED-backlit source brightness degree is regulated according to the output of processing unit 13; If ambient light is a faint light, then strengthens the dynamic range compression degree, is back to processing unit 13, carry out image dynamic compression and stretching again.
Backlight light-adjusting unit 16 receives the output of back light source brightness judgement unit 15, carries out the LED-backlit brightness degree and regulates, and control method comprises current amplitude modulation method, width modulation method etc.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. the method for a LED-backlit source integrally adjusting light is characterized in that: at first preset the backlight light-adjusting degree of distortion, according to degree of distortion dynamic range of images is compressed, make it to be limited in than the zonule; Image carried out stretch compensation, and calculate backlight compensating factor thereafter; Extraneous brightness of last comprehensive distinguishing and backlight compensating factor, the output backlight light-adjusting parameters.
2. the method for LED-backlit according to claim 1 source integrally adjusting light is characterized in that: the method for described compression comprises reduced overall method or high-brightness region compression method.
3. the method for LED-backlit according to claim 1 source integrally adjusting light, it is characterized in that: when image being compressed and stretch, the background luminance factor is taken into account, utilize bright area and the dark areas relative insensitivity of human eye to image background, and to the more sensitive characteristic of medium luminance area, many reservation human eyes sensitizing range pixel, and remove the pixel in the insensitive zone of human eye more.
4. the method for LED-backlit according to claim 1 source integrally adjusting light is characterized in that: many reservation histogram flat site pixels when dynamic range of images being compressed and stretch, and remove the pixel in precipitous zone more.
5. the method for LED-backlit according to claim 1 source integrally adjusting light is characterized in that: add prediction link backlight in backlight compensating factor is calculated, according to the compensating factor of current compensating factor prediction next frame image.
6. LED-backlit source integrally adjusting light device of realizing according to said method, comprise that light modulation parameter in LED-backlit source is provided with interface, is characterized in that: described LED-backlit source light modulation parameter is provided with interface and is connected with that video obtains and image pretreatment unit, image dynamic compression and stretch processing unit, back light source brightness judgement unit and backlight light-adjusting unit in turn; The input end of described back light source brightness judgement unit is connected with extraneous brightness collecting unit, and one of its output terminal is connected with image dynamic compression and stretch processing unit.
7. LED-backlit according to claim 6 source integrally adjusting light device, it is characterized in that: in LED-backlit source light modulation parameter the light modulation parameter described in the interface is set and comprises image fault degree and algorithm types, wherein the image fault degree is manually pre-if choose automatically, can be converted into compressed number of pixels and total pixel number purpose ratio in the image.
8. LED-backlit according to claim 6 source integrally adjusting light device is characterized in that: described image dynamic compression and stretch processing unit adopt reduced overall method or high-brightness region compression method; Wherein image range is stretched to full amplitude, and calculates the backlight compensating factor, and compensating factor is directly proportional with stretch range.
9. LED-backlit according to claim 6 source integrally adjusting light device is characterized in that: in the backlight light-adjusting unit, backlight light-adjusting is the integrally adjusting light formula.
10. LED-backlit according to claim 6 source integrally adjusting light device, it is characterized in that: video obtain and the image pretreatment unit in, the Flame Image Process object comprises R, G, B three looks in the colour-video signal, and various conversion are preferred object with this look disposal route of distortion minimum.
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| CN2009103091656A CN101673530B (en) | 2009-10-30 | 2009-10-30 | Method for integrally adjusting light of LED backlight and device thereof |
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| CN2009103091656A CN101673530B (en) | 2009-10-30 | 2009-10-30 | Method for integrally adjusting light of LED backlight and device thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104239585A (en) * | 2014-10-16 | 2014-12-24 | 福州大学 | Display problem analysis method based on human eye visual perception |
| CN110677593A (en) * | 2017-04-11 | 2020-01-10 | 福建捷宇电脑科技有限公司 | Intelligent dimming method for eliminating brightness and darkness flicker of picture |
| CN110969995A (en) * | 2019-12-13 | 2020-04-07 | 湖南国科微电子股份有限公司 | Display method and device, electronic equipment and readable storage medium |
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2009
- 2009-10-30 CN CN2009103091656A patent/CN101673530B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104239585A (en) * | 2014-10-16 | 2014-12-24 | 福州大学 | Display problem analysis method based on human eye visual perception |
| CN110677593A (en) * | 2017-04-11 | 2020-01-10 | 福建捷宇电脑科技有限公司 | Intelligent dimming method for eliminating brightness and darkness flicker of picture |
| CN110677593B (en) * | 2017-04-11 | 2021-03-23 | 福建捷宇电脑科技有限公司 | Intelligent dimming method for eliminating brightness and darkness flicker of picture |
| CN110969995A (en) * | 2019-12-13 | 2020-04-07 | 湖南国科微电子股份有限公司 | Display method and device, electronic equipment and readable storage medium |
| CN110969995B (en) * | 2019-12-13 | 2021-03-19 | 湖南国科微电子股份有限公司 | Display method and device, electronic equipment and readable storage medium |
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