LED (Light Emitting Diode) backlight driving circuit and LCD (Liquid Crystal Display) device

A technology of backlight driving circuit and LED light bar, applied in lighting devices, light sources, electric light sources, etc., can solve the problems of inflexible thermal protection design and poor versatility, and achieve the effect of flexible design scheme, convenient design and wide application range.

Active Publication Date: 2014-01-08
SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing thermal protection design is inflexible and poor in versatility

Method used

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  • LED (Light Emitting Diode) backlight driving circuit and LCD (Liquid Crystal Display) device
  • LED (Light Emitting Diode) backlight driving circuit and LCD (Liquid Crystal Display) device
  • LED (Light Emitting Diode) backlight driving circuit and LCD (Liquid Crystal Display) device

Examples

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Embodiment Construction

[0032] Such as image 3 As shown, the present invention discloses a liquid crystal display device, and the liquid crystal display device includes an LED backlight driving circuit. The LED backlight drive circuit 1 includes an LED light bar 50, a voltage conversion module 40 for driving the LED light bar, and a driver chip 10 for controlling the voltage conversion module. The driver chip includes a temperature acquisition module 20 using a thermistor, and is coupled with the temperature acquisition module. The adjusting device 30 is a voltage protection module coupled with the output terminal of the voltage conversion module;

[0033] When the temperature exceeds a preset threshold, the thermistor controls the temperature acquisition module to output a protection signal, and the adjustment device controls the voltage conversion module to output a driving voltage exceeding the overvoltage protection threshold of the LED backlight driving circuit according to the protection signa...

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PUM

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Abstract

The invention discloses an LED (Light Emitting Diode) backlight driving circuit and an LCD (Liquid Crystal Display) device. The LED backlight driving circuit comprises an LED light bar, a voltage conversion module and a driving chip, wherein the voltage conversion module is used for driving the LED light bar, the driving chip is used for controlling the voltage conversion module, and the driving chip comprises a temperature collection module adopting a thermistor, a regulation device which is coupled with the temperature collection module and a voltage protection module which is coupled with an output end of the voltage conversion module; when the temperature exceeds a preset threshold value, the thermistor controls the temperature collection module to output a protection signal, the regulation device controls the voltage conversion module to output driving voltage of which the value exceeds an over-voltage protection threshold value of the LED backlight driving circuit according to the protection signal, and an over-voltage protection mechanism is started by the voltage protection module. The LED backlight driving circuit and the LCD device, disclosed by the invention, are convenient to design and good in universality.

Description

technical field [0001] The invention relates to the field of liquid crystal display, and more specifically relates to an LED backlight driving circuit and a liquid crystal display device. Background technique [0002] The liquid crystal display device includes a liquid crystal panel and a backlight module. The existing backlight module generally uses LEDs as the backlight source, so it is necessary to use an LED backlight drive circuit to adjust the brightness of the LED light bar. The LED backlight driving circuit includes a driving chip. When the temperature of the backlight module is too high, in order to protect the driving chip from being damaged by high temperature, a thermal protection circuit will be extended outside the driving chip. Such as figure 1 As shown, the thermal protection circuit includes a comparator P, the non-inverting input terminal of the comparator is connected with a fixed reference voltage, the inverting input terminal is connected to the collect...

Claims

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Application Information

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IPC IPC(8): G09G3/34G09G3/36H05B44/00
CPCG09G3/3406G09G2330/045H05B45/50H05B47/24Y02B20/30H05B45/37H05B45/56H05B45/395H05B47/10
Inventor 黎飞
Owner SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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