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LED backlight control system of liquid crystal display

A liquid crystal display and backlight control technology, applied to static indicators, instruments, etc., can solve problems such as low contrast and poor display effect

Inactive Publication Date: 2015-06-17
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, in the large-screen LED backlight, a light guide plate is used to control the backlight in the entire liquid crystal display area, and the light of the liquid crystal display screen is uniform. The same, that is, on the LCD screen, some areas display brighter video content, and some areas display darker video content. Therefore, the use of uniform light is easy to cause low contrast in a certain area and poor display effect.

Method used

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  • LED backlight control system of liquid crystal display
  • LED backlight control system of liquid crystal display
  • LED backlight control system of liquid crystal display

Examples

Experimental program
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Embodiment 1

[0025] Such as figure 1 As shown, this embodiment provides an LED backlight control system for a liquid crystal display, the LED backlight control system includes an LED backlight module and a control module, and the control module is used to control each LED light-emitting unit in the LED backlight module , so that the liquid crystal display screen has better backlight display effect.

[0026] Wherein, the LED backlight module includes two or more LED lighting units and two or more light guide plates, and the number of light guide plates can be determined according to the size of the liquid crystal display and the shape of the light guide plates And size selection, each light guide plate is correspondingly provided with one or more LED light-emitting units, each LED light-emitting unit is used as the light source of the LED backlight module, and each light guide plate is used as a surface light source for emitting light from the point light source of the LED light-emitting un...

Embodiment 2

[0035] Such as figure 2As shown, on the basis of the above examples, in the LED backlight control system of the liquid crystal display provided by this embodiment, each set of backlight brightness adjustment data includes red LED backlight brightness adjustment data, green LED backlight brightness adjustment data and The brightness adjustment data of the blue LED backlight, and each control sub-module is correspondingly provided with a red control area, a green control area and a blue control area, which are used to respectively control the red LED, blue LED and green LED in each LED light-emitting unit. LED.

[0036] In each control sub-module, the red control area receives the red LED backlight brightness adjustment data, and adjusts the control signal in the red control area according to the red backlight brightness adjustment data, and sends the adjusted control signal Control the red LED in the corresponding light guide plate; the green control area receives the brightn...

Embodiment 3

[0040] Such as image 3 As shown, on the basis of the above examples, in the LED backlight control system of the liquid crystal display provided by this embodiment, the control signal input terminal includes a master control signal input terminal and one or more slave control signal input terminals, , the master control signal input terminal is used to receive the master control signal, and the slave control signal input is used to receive the slave control signal, the master control signal and the slave control signal can be the same control signal, that is, the slave control signal is the A backup of the master control signal described above.

[0041] When each control sub-module is working, it receives the master control signal and the slave control signal respectively, and then judges whether the master control signal is wrong, and when the master control signal input is normal, selects the master control signal, and, by The received backlight brightness adjustment data i...

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Abstract

The invention discloses an LED backlight control system of a liquid crystal display, which comprises an LED backlight module and a control module. The LED backlight module comprises at least two LED light-emitting units and at least two light guide plates; grooves of the LED light-emitting units are arranged at the centers of the light guide plates; the control module is provided with a redundant sub module, a brightness analysis sub module, a data distribution sub module and at least two control sub modules; the redundant sub module is provided with two video signal input interfaces and receives and selects one of the video signals; the brightness analysis sub module analyzes the video signal and generates backlight brightness data according to the analysis result; the data distribution sub module groups the data according to the backlight brightness data and sends the data groups to the control sub modules; and the control sub modules control the brightness of the LED light-emitting units according to the grouped backlight brightness data. The liquid crystal display which adopts the LED backlight control system has consistent backlight contrast in all the display areas, strong video mobility and good display effect.

Description

technical field [0001] The invention relates to a control system of an LED lighting device, in particular to an LED backlight control system of a liquid crystal display screen. Background technique [0002] With the development of society, flat-panel displays will become more and more popular, especially in the TV field. The development trend of LCD TVs is already obvious. In the future, LCD TVs will become the leading role of large-screen flat-panel TVs. [0003] LEDs have long been used as backlights in small-sized LCD screens, such as 1.5-inch to 7-inch screens such as mobile phones, PDAs, PMPs, and GPSs. Now they are gradually developing into larger-sized screens to erode the CCFL market. For example, the LCD backlight of notebook computers has begun to be gradually replaced by LEDs. In the application of these small screens, most of them directly use white LEDs as backlights. Compared with CCFLs, LEDs have many significant advantages, such as no mercury, long life, lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34G09G3/36
Inventor 黄兴利李闻白李虎雄
Owner WENZHOU UNIVERSITY
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