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A LED backlight dead pixel repair method based on liquid crystal pixel compensation

A liquid crystal pixel and repair method technology, applied in the field of LED backlight dead pixel repair, can solve problems such as affecting the uniformity of the backlight module, affecting the display of video image effects, etc., so as to improve the light passing rate, reduce the impact, and avoid complex and uncertain effects.

Active Publication Date: 2019-10-25
TIANJIN UNIV
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Problems solved by technology

Single or multiple LED dead pixels will affect the uniformity of the entire backlight module, which in turn will affect the display of video image effects

Method used

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  • A LED backlight dead pixel repair method based on liquid crystal pixel compensation
  • A LED backlight dead pixel repair method based on liquid crystal pixel compensation
  • A LED backlight dead pixel repair method based on liquid crystal pixel compensation

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example

[0063] This example uses LG40-inch BL5610-CD series as the experimental platform, the screen ratio is 16:9, the diagonal length of the 40-inch screen is 40×2.54=101.6cm, and the area parameter of the backlight is 885.6*498.15mm. The light source of the backlight is provided by common white LEDs, and each LED has a luminous flux of 150 lumens. The horizontal LED spacing is 2.6cm, the vertical spacing is 1.3cm, the LED light mixing distance is 3.6cm, the gap between the film layers is set to 0.1mm, and the total number of LEDs used in the backlight system is 1292. The LED dead pixel repair process is as follows:

[0064] 1. Optical Research Associates is selected The Light Tools optical software designed by the company builds the backlight module, and uses the drawing tools of the AutoCAD (Autodesk Computer Aided Design) software to build the backlight model of the backlight module, including drawing the basic three-dimensional model of the backlight cavity and the basic three...

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Abstract

The invention discloses an LED backlight defective pixel repair method based on liquid crystal pixel compensation. The repair method comprises the following steps: constructing a backlight module model under a normal light source situation and a backlight module model under a defective pixel situation via drawing tools of optical simulation software and AutoCAD software; determining defective pixels of an LED light source in the backlight module model under the defective pixel situation; determining a backlight brightness value of a receiving surface of the backlight module model under the normal light source situation; determining a backlight brightness value of a receiving surface of the backlight module model under the defective pixel situation; normalizing the two backlight brightnessvalues to 0-255 orders; and implementing liquid crystal compensation. According to the repair method provided by the invention, the display effect of an entire liquid crystal display system under a backlight defect situation can be guaranteed to the greatest extent, so that the influence of the LED defective pixels in a backlight board on the entire liquid crystal display system is effectively reduced. Problems of a backlight diffusion model which is complicated and variable, difficult in calculation and the like can be effectively avoided via a liquid crystal compensating factor determined bythe optical simulation software.

Description

technical field [0001] The invention relates to a method for repairing dead pixels of LED backlights. In particular, it relates to a LED backlight dead point repair method based on liquid crystal pixel compensation to realize a small number of dead pixels in a high dynamic range backlight for multi-region high-precision control LEDs. Background technique [0002] 1. Brief introduction of dynamic LED backlight technology [0003] According to the collocation of optical components, liquid crystal display can be divided into two parts: liquid crystal display module and backlight film group. The backlight module is mainly composed of backlight source, light guide plate, brightness enhancement film, diffusion film, reflective film and other parts. The backlight module is an important part of the liquid crystal display. The backlight concentrates 80% of the thickness of the LCD, 70% of the power consumption, and 40% of the material cost. At the same time, the surface light emitte...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34G09G3/36
CPCG09G3/3413G09G3/36G09G2320/0626
Inventor 张涛邱亮潘希豪
Owner TIANJIN UNIV
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