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Side-in-type LED backlight source liquid crystal display dynamic dimming method and device

A technology of LED backlight and liquid crystal display, applied in static indicators, cathode ray tube indicators, instruments, etc., can solve the problems of increasing the difficulty of dimming in side-entry structures, uneven diffusion of backlight, and difficulty in accurately controlling the brightness of backlight, etc.

Active Publication Date: 2014-01-15
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, in the side-type backlight structure, when the light guide plate and the reflector guide the light emitted by the LED backlight group to each area of ​​the screen, the optical attenuation is relatively serious, and the light emitted by different LED backlight groups overlaps each other. As a result, the backlight is unevenly diffused, and the brightness of the backlight is difficult to control precisely. These problems will increase the difficulty of dimming the side-entry structure

Method used

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  • Side-in-type LED backlight source liquid crystal display dynamic dimming method and device
  • Side-in-type LED backlight source liquid crystal display dynamic dimming method and device
  • Side-in-type LED backlight source liquid crystal display dynamic dimming method and device

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Experimental program
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Effect test

Embodiment 1

[0134] for Figure 10 as shown in the picture, Figure 11 It is the picture displayed without dimming. After four-step dimming, the brightness of the final 16 groups of LED backlight groups is obtained, which are 53, 61, 15, 15, 240, 226, 189, 193, 185, 196, 255, 204, 118, 58, 95, 93, the power consumption is reduced to 53.82% of that without dimming, and the final backlight is as follows Figure 12 As shown, the display image after dimming is as follows Figure 13 shown.

Embodiment 2

[0136] for Figure 14 In the picture shown, the center and the lower left corner are marked contrast test points, which are not shown in the actual picture. The contrast is the ratio of the brightness of the center test point to the brightness of the test point in the lower left corner. Figure 15 It is an undimmed display image. After four-step dimming, the brightness of the final 16 groups of LED backlight groups is obtained, which are 0, 0, 57, 84, 255, 255, 230, 239, 227, 245, 255, 255 , 43, 78, 0, 0, the power consumption is reduced to 54.49% of that without dimming; the final backlight is as follows Figure 16 As shown, the display image after dimming is as follows Figure 17 shown. The contrast ratio is 1115:1 when undimmed, and increases to 24000:1 after four-step dimming.

[0137] It can be seen from the above two embodiments that the proposed dimming method can effectively reduce the power consumption of the backlight, and improve the contrast of the picture, ther...

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Abstract

Provided is a side-in-type LED backlight source liquid crystal display dynamic dimming method and device. A face plate is divided into m*n rectangular logic zones; then each rectangular logic zone is affiliated to an LED backlight lamp set which has the largest diffusion ratio on the rectangular logic zone; input image data are stored in a storage, and meanwhile target backlight of each rectangular logic zone is computed through input images; the brightness of each LED backlight lamp sets is determined through the four dimming steps. According to the method and the device, the four steps of a dimming algorithm are used, backlight power loss can be effectively lowered, and meanwhile image quality is enhanced, the brightness of each LED backlight lamp set is obtained, the four dimming steps are easy to achieve, for different side-in-type backlight types, an algorithm can be achieved flexibly by dividing the logic zones, and universality is strong.

Description

technical field [0001] The invention belongs to the technical field of dynamic dimming of LED backlight sources, and relates to a dynamic dimming method and device for a side-entry LED backlight liquid crystal display. Background technique [0002] The liquid crystal display includes two parts, the backlight module and the liquid crystal panel. For the conventional method, the backlight of the liquid crystal display is always bright, and the gray scale is realized by changing the transmittance of the liquid crystal. The disadvantage is that the backlight consumes a lot of power, even if the input image is very dark. The power consumption will not be reduced, and the contrast of the screen will also be reduced due to the natural light leakage of the liquid crystal; dynamic dimming is to dynamically adjust the brightness of the backlight according to the displayed screen and reduce the backlight in dark areas, thereby reducing the power consumption of the backlight , At the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/36G09G5/10
Inventor 张小宁杨雷屠震涛梁志虎李纯怀李浩何振伟朱立伟
Owner XI AN JIAOTONG UNIV
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