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Method for controlling dynamic backlight of LED of liquid crystal display based on dynamic threshold

A dynamic backlight control, liquid crystal display technology, applied in static indicators, instruments, etc., can solve problems such as power consumption not meeting design requirements, and achieve the effect of improving picture quality, simple algorithm, and less distortion

Active Publication Date: 2013-01-30
中航华东光电有限公司
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Problems solved by technology

Obviously, the problem of power consumption cannot meet the design requirements, and it also runs counter to the current national policy of energy saving and emission reduction

Method used

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Embodiment Construction

[0013] For each frame of image, we first extract the maximum value of each pixel RGB of the image through MATLAB programming (this can reduce the number of pixels overflowing and distorted after pixel compensation), and divide the matrix composed of the maximum value into 12×16, a total of 192 Then, program to get the maximum value Imax and the average value Iaverage of the gray value of each region, and calculate the brightness corresponding to the gray value, that is, the maximum brightness max=(Imax / 255) of the region r , average brightness average=(Iaverage / 255) r , r=2.2. Using MATLAB programming to obtain the maximum threshold T of the variance between classes, and binarize the image, the pixel value greater than T is 1, and the pixel value smaller than T is 0, and the number of pixel values ​​1 in each area is counted as M1( represents the details of the image), the number of pixel values ​​of 0 is recorded as M0 (representing the background of the image), according to...

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Abstract

The invention provides a method for controlling dynamic backlight of an LED (Light-Emitting Diode) of a liquid crystal display based on a dynamic threshold, comprising the following steps of: firstly, obtaining a threshold T which maximizes the interclass variance between the background and a target by a threshold dichotomization method; calculating the backlight brightness change coefficient of each region; putting the backlight brightness change coefficient K (m, n) in a formula BL (m, n)=average (m, n)+K (m, n)*(max(m, n)-average (m, n)), thereby obtaining the backlight brightness of each region. The method is characterized in that the algorithm dynamically increases the backlight brightness according to the proportion of image details on the basis of the average image brightness, the proportion of the image details is obtained by the Otsu method, the algorithm is simple, and the image quality of the liquid crystal display is improved while the power consumption is reduced.

Description

technical field [0001] The invention relates to an LED backlight control method, in particular to an LED dynamic backlight control method. Background technique [0002] With the continuous improvement of people's quality of life, LCD TVs are developing in the direction of large size, ultra-thin, wide color gamut, and high contrast. LED backlight LCD TV is gradually moving towards the research field and application market along with people's needs, and in the LED backlight LCD TV technology, LED area dynamic backlight LCD TV is the focus of current LCD research. The dynamic backlight main luminance extraction algorithm has gradually become an important research object of various LCD TV manufacturers and institutions because it involves reducing the power consumption of the backlight to the greatest extent while ensuring the display image quality. [0003] Significance of this technical research: (1) Improving the picture display quality. We know that the closer the LCD TV b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/36
Inventor 章小兵刘波朱标陈文明赵小珍
Owner 中航华东光电有限公司
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