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Dynamic dimming method of liquid crystal display LED backlight

A technology of LED backlight and LED backlight, applied in static indicators, instruments, etc., can solve the problems of low contrast and high power consumption of the display, and achieve the effect of avoiding flickering.

Inactive Publication Date: 2014-05-07
DIHAO ELECTRONICS YANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the always full brightness of the backlight and the light leakage of the liquid crystal light valve, the traditional liquid crystal display has high power consumption and low contrast ratio

Method used

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  • Dynamic dimming method of liquid crystal display LED backlight
  • Dynamic dimming method of liquid crystal display LED backlight
  • Dynamic dimming method of liquid crystal display LED backlight

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: The LED backlight is a direct type LED backlight, including M×N LED backlight partitions. In step (1), the liquid crystal panel is divided into M×1 rectangular partitions, and the i-th rectangular partition corresponds to (i, 1), (I, 2)...(i, N) LED backlight group, i=1, 2, 3...M.

Embodiment 2

[0027] Embodiment 2: The LED backlight is an edge-type LED backlight, and M LED backlight groups are arranged on the left or right side of the liquid crystal panel. In step (1), the liquid crystal panel is divided into M×1 rectangular partitions. The i-th rectangular partition corresponds to the i-th LED backlight group on the left or right side, i=1, 2, 3...M.

Embodiment 3

[0028] Embodiment 3: The LED backlight is an edge-type LED backlight, and M LED backlight groups are arranged on the left and right sides of the liquid crystal panel. In step (1), the liquid crystal panel is divided into M×1 rectangular partitions , The i-th rectangular partition corresponds to the i-th LED backlight group on the left and right side, i=1, 2, 3...M.

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Abstract

The invention discloses a dynamic dimming method of a liquid crystal display LED (Light Emitting Diode) backlight. The dynamic dimming method comprises the following steps that: (1) a liquid crystal panel is divided into M*1 rectangular zones; (2) a central control module receives the RGB (Red, Green, Blue) signal of each frame of image and obtains a liquid crystal signal value and an LED backlight gray level value BL through a dynamic dimming algorithm; (3) the central control module sends the liquid crystal signal value to a liquid crystal driver module and the liquid crystal driver module controls the deflection of liquid crystal molecules of the liquid crystal panel according to the liquid crystal signal value; and (4) when all liquid crystal molecules of the ith rectangular zone of the liquid crystal panel are completely deflected through the time of ti according to the liquid crystal signal value, a zone time sequence control module sends an LED starting signal to an LED driver module, and the LED driver module drives the LED backlight corresponding to the ith zone to begin emitting light according to the LED stating signal, wherein the light emitting time is in linear relation with the corresponding LED backlight gray level value. The dynamic dimming method is capable of effectively solving the problem of screen flickering.

Description

Technical field [0001] The invention relates to a dynamic dimming method for a liquid crystal display LED backlight source, and belongs to the technical field of liquid crystal display screens. Background technique [0002] Liquid crystal display (LCD) has become the most widely used flat panel display device due to its high resolution, light weight, and good color expression. The liquid crystal display mainly includes two parts: LED backlight and liquid crystal panel. The LED backlight of the traditional liquid crystal display keeps full brightness to provide a constant backlight for the liquid crystal panel, while the liquid crystal controls the light transmittance by deflecting at different angles to achieve gray levels and achieve the purpose of displaying images. Because the backlight is always on and the liquid crystal light valve has light leakage, the traditional liquid crystal display has high power consumption and low contrast. [0003] The dynamic dimming technology dy...

Claims

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Application Information

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IPC IPC(8): G09G3/36G09G3/34
Inventor 张小宁杨孝泉杨雷李超
Owner DIHAO ELECTRONICS YANGZHOU
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