LED backlight brightness dynamic control method and system adopting same
A backlight brightness and dynamic control technology, applied in optics, nonlinear optics, static indicators, etc., can solve problems such as image contrast drop, TV image contrast drop, image signal gray value difference, etc., to reduce power consumption, improve The effect of image dynamic contrast
Active Publication Date: 2012-09-26
HISENSE VISUAL TECH CO LTD
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However, since the rule of this partition control method is to pre-divide the image according to the position on the display screen, and then map the image to the corresponding area for partition control, this partition control of the LED backlight panel has inherent defects: due to the backlight area It is a pre-divided fixed area, and the gray value of the image signal in the same backlight area may vary greatly, which will inevitably lead to a decrease in the contrast of the TV image
The disadvantage is that the backlight area is pre-allocated according to the display screen, so that the gray value in the same backlight area may not be exactly the same, resulting in a decrease in image contrast and poor image quality
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[0032] The present invention provides a backlight control method. By detecting the brightness of the full-screen backlight, the change of the brightness of the full-screen backlight is controlled to improve the brightness of the screen and avoid light leakage defects. At the same time, the control of the brightness also improves the overall Subjective effects, and dynamic contrast.
[0033] figure 1 Shown in is a schematic diagram of an embodiment of using the method of the present invention to partition the brightness of the backlight. In the figure, it is shown that the backlight area of the entire display image is divided into N×N (N is a natural number greater than 1) first-level control areas, each A first-level control area can be divided into M×M (M is a natural number greater than 1) second-level control areas, and the brightness control signal corresponding to each control area is represented as C 11 , C 12 ......C NN And the second-level control area in the firs...
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The invention relates to an LED backlight brightness dynamic control method and a system adopting the same, in particular to an LED backlight brightness control method and a system adopting the backlight brightness control method. The method comprises the following steps of: dividing an LED backlight area into control areas, and predetermining the threshold values of image gray contrast difference coefficients in the control areas; respectively calculating the image gray contrast difference coefficients in different control areas, and respectively comparing calculating results with the threshold values; if the calculating results are smaller than the threshold values, displaying the same backlight brightness in the control areas by adopting a single control mode; and if the calculating results are larger than the threshold values, displaying different backlight brightness in the control areas by adopting multiple control modes. Thus, the invention provides the LED backlight brightnessdynamic control method of achieving the goals of improving the image dynamic contrast and reducing power consumption by utilizing an image information dynamic allocation backlight area.
Description
technical field [0001] The invention relates to a light emission control method using liquid crystal and controlling light emission from an independent light source for displaying images, in particular to a dynamic control method of LED backlight brightness, and also to a system for realizing the backlight brightness control method. Background technique [0002] With the continuous development of TV technology, LED, as a new type of backlight for LCD TVs, has the characteristics of wide color gamut and low power consumption compared with the CCFL backlight used in LCDs. At the same time, the appearance of LED backlight makes it possible for people to dynamically control the brightness of the backlight according to the image, so the current LED backlight technology has been widely used in the field of TV manufacturing. [0003] In order to further improve the performance of LED TVs, obtain higher image contrast, and achieve lower power consumption, dynamic control of LED back...
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IPC IPC(8): G09G3/34G02F1/13357
Inventor 徐志强
Owner HISENSE VISUAL TECH CO LTD