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LED backlight module used for liquid crystal display

A liquid crystal display and backlight module technology, applied in optics, nonlinear optics, instruments, etc., can solve the problem of insufficient uniformity of the backlight of the liquid crystal display

Inactive Publication Date: 2010-08-18
深圳市中庆微科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the LED backlight module of the liquid crystal display generally uses a light guide plate to distribute the light source evenly, but because the LED light is directional, the backlight of the liquid crystal display is still not uniform enough in the case of less use of LEDs.

Method used

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  • LED backlight module used for liquid crystal display
  • LED backlight module used for liquid crystal display
  • LED backlight module used for liquid crystal display

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Such as figure 1 As shown, this embodiment provides an LED backlight module for a liquid crystal display. The LED backlight module includes four or more LED light-emitting units 103, a light guide plate 101, and a control unit 102. Each LED light-emitting unit 103 is used as the light source of the LED backlight module; the light guide plate 101 is used to uniformly export the light emitted by each LED light-emitting unit; the control unit 102 is used to adjust and control each LED light-emitting unit so that each The LED light-emitting unit can emit light, and realize various functional effects, such as white light, brightening, and darkening.

[0027] Each LED light-emitting unit 103 is provided with a red LED, a blue LED and a green LED, wherein the ratio of each LED light-emitting unit with red, blue, and green LEDs is 1:1:1; or, each LED light-emitting unit 103 is provided with red and blue The ratio of the green LEDs is 1:1:2. For example, each LED light emitting un...

Embodiment 2

[0035] Such as figure 2 As shown, on the basis of the above examples, in the LED backlight module for liquid crystal display provided by this embodiment, the light guide plate 101 is provided with eight or more LED light-emitting units, such as the guide The light plate 101 is provided with eight LED light-emitting units, that is, in addition to the four LED light-emitting units provided at the four top corners of the light guide plate, the light guide plate is also provided with four LED light-emitting units, which can be It is arranged on each side surface or each side surface of the light guide plate, generally corresponding to a rectangular light guide plate, which has two side surfaces and four side surfaces, and the first side surface of the light guide plate is its light-emitting surface. The first side emits light as incident light from the backlight module of the liquid crystal display.

[0036] For example, the four side surfaces of the light guide plate also have LED ...

Embodiment 3

[0038] Such as image 3 As shown, on the basis of the above examples, in the LED backlight module for liquid crystal display provided in this embodiment, the control unit is also provided with a temperature detection module. For example, a temperature sensor can be provided to sense the The temperature of the liquid crystal display can be used to detect the temperature of the liquid crystal display. The temperature of the liquid crystal display refers to the temperature of the backlight module and the liquid crystal panel. Each liquid crystal display can be equipped with multiple sensors, The temperature is the average value of the temperatures sensed by the multiple sensors.

[0039] The temperature detection module is connected to the PWM modulator, and the temperature detection module detects the temperature of the liquid crystal display screen, and generates first adjustment data according to the temperature, and sends it to the PWM modulator. The PWM modulator adjusts the br...

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Abstract

The invention discloses an LED backlight module used for a liquid crystal display, which comprises at least four light-emitting units, a light guide plate and a regulation unit, wherein each LED light-emitting unit is provided with red, blue and green LEDs; the light guide plate is in a rectangular shape, four point angles of the light guide plate are respectively provided with an LED light-emitting unit, light outlet surfaces of two LED light-emitting units arranged diagonally are arranged oppositely; grooves containing the light outlet surfaces of the corresponding LED light-emitting units are arranged corresponding to each LED light-emitting unit, and the shape and the size of the groove are consistent with those of the light outlet surface of the LED light-emitting unit, which is correspondingly contained by the groove; the regulation unit comprises a control module and a PWM modulator; the control module is used for generating a control signal to control each LED light-emitting unit; and the PWM modulator is used for generating a regulation signal to regulate the LED brightness of each LED light-emitting unit. The invention has the advantages of small power consumption, high light emitting efficiency, uniform light emitting and good light emitting effect.

Description

Technical field [0001] The present invention relates to a lighting device, in particular, to an LED backlight module for 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 protagonist of large-screen flat-panel TVs. [0003] LEDs have long been used as backlights in small LCD screens, such as mobile phones, PDAs, PMPs, GPS and other 1.5-inch to 7-inch screens, but now they are gradually developing to larger screens to eat into the CCFL market. For example, the LCD backlight of notebook computers has gradually been replaced by LEDs. In these small screen applications, most of them directly use white LEDs as backlights. Of course, LEDs have many significant advantages over CCFL, such as mercury-free, long life, large brightness adjustment range, high contrast, and st...

Claims

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Application Information

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IPC IPC(8): G02F1/13357
Inventor 商松
Owner 深圳市中庆微科技开发有限公司
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