CN101751874B - LCD TV intelligent dynamic backlight control method - Google Patents
LCD TV intelligent dynamic backlight control method Download PDFInfo
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- CN101751874B CN101751874B CN 200810217674 CN200810217674A CN101751874B CN 101751874 B CN101751874 B CN 101751874B CN 200810217674 CN200810217674 CN 200810217674 CN 200810217674 A CN200810217674 A CN 200810217674A CN 101751874 B CN101751874 B CN 101751874B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 10
- 238000005286 illumination Methods 0.000 claims description 19
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000001792 White test Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Abstract
Aiming at solving the backlight dynamic control problem of a liquid crystal display television (LCD TV), the invention provides a simple and easy LCD TV intelligent dynamic backlight control method, including the following steps: building up an analog function relationship between the current image brightness value and the desired backlight brightness value according to eye comfortableness of a watcher; reading the average brightness value of all frames of images from an image chip, and calculating the current image brightness value through the average brightness value; working out the desired backlight brightness value according to the function relationship between the current image brightness value and the desired backlight brightness value; and finally changing the backlight brightness of the screen of the LCD TV to be the desired backlight brightness value. The method is simple, easy and mature and can substantially improve the image dynamic contrast ratio of the LCD TV and reach the purposes of reducing the average brightness of the image, improving the eye comfortableness, saving energy and reducing energy consumption.
Description
Technical field
The present invention relates to a kind of LCD TV backlight control method, relate to particularly a kind of LCD TV intelligent dynamic backlight control method.
Background technology
Existing LCD TV user is the bright degree by the human eye perceives television image, then by the method for manual adjustment backlight intensity screen intensity is suitably adjusted, television system receives regulating command backlight and the backlight brightness values that the user sends, system carries out this order and changes screen backlight brightness, realizes the backlight control function.Existing this backlight control is secretly adjusted because human eye judgement image frame background is bright, is easier to lose the gray shade scale of image, thereby has also reduced image quality.Because backlight illumination does not change with the bright dark variation of picture background, and backlight illumination is constant, energy consumption is larger simultaneously.
Summary of the invention
The present invention provides a kind of simple LCD TV intelligent dynamic backlight control method for addressing the above problem.
The present invention realizes that the technical scheme that goal of the invention adopts is, a kind of LCD TV intelligent dynamic backlight control method is at first according to the human eye comfort level, for current picture brightness value and backlight brightness value are set up the analog function relation; Then read the average brightness value of every two field picture from image chip, definition is as the relative former frame picture brightness of former frame average brightness value value weight ratio Q, its operation relation is: current picture brightness value=Q * current average brightness value+(1-Q) * previous picture brightness value, Q is [0,1], calculates current picture brightness value by average brightness value; Funtcional relationship according to current picture brightness value and backlight brightness value obtains backlight brightness value again; Change at last the liquid crystal television screen backlight illumination, make it the backlight brightness value for obtaining.Adopt the mode of gradual change when changing backlight illumination, the each variable quantity that changes backlight illumination of definition is X, and the time interval of adjustment is T, adjusts backlight illumination by the value of adjusting T/X.
The present invention uses television system to detect every frame picture average brightness value cleverly, comparison by front and back frame picture average brightness value, calculate current picture brightness value, by changing backlight brightness value and current picture brightness graph of a relation, realize the non-linear backlight brightness of not same frame picture brightness.Change speed and degree of strength according to different television image background light and shades, allow the user in intelligence adjusting menu option backlight, arrange, automatically adjust respectively T, X and Q to realize best regulating effect backlight; System can reduce backlight illumination automatically when picture background brightness is dimmed, reaches energy-saving and cost-reducing purpose.
The invention has the beneficial effects as follows, the method is simple, ripe, and the picture dynamic contrast of LCD TV is significantly improved, can reach reduce the picture mean flow rate, improve the human eye comfort level, energy-saving and cost-reducing purpose.
Description of drawings
Fig. 1, current picture brightness value-backlight brightness value function relation figure.
Among the figure, B backlight brightness value, the current picture brightness value of Y.
Embodiment
A kind of LCD TV intelligent dynamic backlight control method, at first according to the human eye comfort level, for current picture brightness value and backlight brightness value are set up the analog function relation, as shown in Figure 1, Ymax/Ymid/Ymin is defined as respectively that the brightness of every frame picture is maximum, middle, minimum value; Bmax/Bmin is defined as respectively backlight illumination target maximum, minimum value; TP and Ymid determine that two sections change slope; Dly_L/Dly_M/Dly_H is respectively every corresponding every step required period of whole backlight illumination, and generally speaking, backlight brightness value increases with the increase of current picture brightness value; Then read the average brightness value of every two field picture from image chip, definition is as the relative former frame picture brightness of former frame average brightness value value weight ratio Q, its operation relation is: current picture brightness value=Q * current average brightness value+(1-Q) * previous picture brightness value, Q is [0,1], calculates current picture brightness value by average brightness value; Have consistance because the liquid crystal display of same model shows, specific design can be measured actual liquid crystal display brightness value by the brightness measurement analytical instrument, changes the liquid crystal display brightness value by the adjusting backlight luminance value.Liquid crystal display brightness theoretical value 500cd/m for example
2(the general 400cd/m of actual measurement
2), in design process, send into one secondary 50% complete white test signal and show, the LCD TV image parameter is arranged standard, the adjusting backlight luminance value is until the brightness of measurement liquid crystal display is 250cd/m again
2, this backlight brightness values is defined as TP.
Funtcional relationship according to current picture brightness value and backlight brightness value obtains backlight brightness value again; Change at last the liquid crystal television screen backlight illumination, make it the backlight brightness value for obtaining.
Adopt the mode of gradual change when changing backlight illumination, the each variable quantity that changes backlight illumination of definition is X, and the time interval of adjustment is T, adjusts backlight illumination by the value of adjusting T/X.
Specifically can implement like this: television set intelligently setup menu backlight has three, " change intensity backlight " option is set represents X (high, medium and low), and it is X[0 that backlight illumination is regulated actual value, 255], ' height ' arranges X=100, ' in ' X=50 is set, ' low ' arranges X=1; " response backlight " pick list is set is shown T (fast, in, slow), ' soon ' is set to T＜20ms, ' in ' be set to 20MS＜T＜40MS, ' slowly ' is set to T〉60MS; " front frame picture brightness impact relation " pick list is shown Q (important, general, slight), and ' important ' arranges Q=0.2, and ' generally ' arranges Q=0.5, ' slightly '=0.8.The user can suitably regulate according to the scene of television image.Existing domestic television program per second 25 frame pictures, every frame picture interval time is 40MS, and general 20MS of major cycle cycle of common TV system, an instruction cycle is 1us, television system has the sufficient time to process the corresponding LCD screen backlight illumination of every frame picture.
Claims (2)
1. LCD TV intelligent dynamic backlight control method, its step comprises:
A is according to the human eye comfort level, for current picture brightness value and backlight brightness value are set up the analog function relation;
B reads the average brightness value of every two field picture from image chip, definition is as the relative former frame picture brightness of former frame average brightness value value weight ratio Q, its operation relation is: current picture brightness value=Q * when former frame average brightness value+(1-Q) * former frame picture brightness value, Q is [0,1], calculates current picture brightness value by average brightness value;
C obtains backlight brightness value according to the funtcional relationship of current picture brightness value and backlight brightness value;
D changes the liquid crystal television screen backlight illumination, makes it the backlight brightness value for obtaining.
2. a kind of LCD TV intelligent dynamic backlight control method according to claim 1, it is characterized in that: in described d step, mode with gradual change changes the liquid crystal television screen backlight illumination, the each variable quantity that changes backlight illumination of definition is X, the time interval of adjusting is T, adjusts backlight illumination by the value of adjusting T/X.
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| CN 200810217674 CN101751874B (en) | 2008-11-28 | 2008-11-28 | LCD TV intelligent dynamic backlight control method |
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| CN 200810217674 CN101751874B (en) | 2008-11-28 | 2008-11-28 | LCD TV intelligent dynamic backlight control method |
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| CN101751874A CN101751874A (en) | 2010-06-23 |
| CN101751874B true CN101751874B (en) | 2013-03-06 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102402970B (en) * | 2011-12-21 | 2014-08-20 | Tcl王牌电器(惠州)有限公司 | Method and device for adjusting contrast of display screen |
| CN103051812B (en) * | 2013-01-14 | 2015-02-25 | 成都西可科技有限公司 | Method for realizing energy saving through automatically adjusting backlight brightness of mobile phone screen |
| CN105869577A (en) * | 2015-11-25 | 2016-08-17 | 乐视致新电子科技（天津）有限公司 | Display device image processing method and system |
| CN105657301B (en) * | 2016-02-22 | 2019-06-11 | 深圳市华星光电技术有限公司 | Show the method and device of image |
| CN105761267B (en) * | 2016-03-08 | 2019-08-06 | 重庆邮电大学 | A kind of method and device of image procossing |
| CN111583875A (en) * | 2020-04-27 | 2020-08-25 | 安徽康佳电子有限公司 | Television energy efficiency control method for improving image quality effect |
| CN112689107B (en) * | 2020-12-16 | 2022-02-08 | 四川长虹电器股份有限公司 | Method for dynamically adjusting backlight |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007046320A1 (en) * | 2005-10-18 | 2007-04-26 | Sharp Kabushiki Kaisha | Liquid crystal display |
| WO2007091505A1 (en) * | 2006-02-08 | 2007-08-16 | Sharp Kabushiki Kaisha | Liquid crystal display device |
| CN101202023A (en) * | 2006-11-30 | 2008-06-18 | 夏普株式会社 | Liquid crystal display with area adaptive backlight |
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- 2008-11-28 CN CN 200810217674 patent/CN101751874B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007046320A1 (en) * | 2005-10-18 | 2007-04-26 | Sharp Kabushiki Kaisha | Liquid crystal display |
| WO2007091505A1 (en) * | 2006-02-08 | 2007-08-16 | Sharp Kabushiki Kaisha | Liquid crystal display device |
| CN101202023A (en) * | 2006-11-30 | 2008-06-18 | 夏普株式会社 | Liquid crystal display with area adaptive backlight |
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