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LED (light-emitting diode) backlight source and liquid crystal display

A technology of LED backlight and liquid crystal display, applied in the direction of light source, electric light source, static indicator, etc., can solve the problems of increasing the output power of the booster circuit 120, burnt out of the circuit components of the driving circuit, and large current, so as to reduce the output power, The effect of improving safety and reliability and avoiding burning

Active Publication Date: 2013-10-16
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the resistor R1 of one of the plurality of LED strings 130 is short-circuited, the current in one of the plurality of LED strings 130 will become infinite, and the output power of the booster circuit 120 will increase sharply, which will lead to a breakdown in the entire driving circuit. Circuit devices may be burned or even caught fire

Method used

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  • LED (light-emitting diode) backlight source and liquid crystal display
  • LED (light-emitting diode) backlight source and liquid crystal display
  • LED (light-emitting diode) backlight source and liquid crystal display

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Embodiment Construction

[0024] Embodiments of the invention will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures. In the drawings, the thicknesses of layers and regions may be exaggerated for clarity. In the following description, unnecessary detailed descriptions of well-known structures and / or functions may be omitted in order to avoid obscuring the inventive concept caused by unnecessary detailed descriptions of well-known structures and / or functions.

[0025] figure 2 is a schematic diagram showing an LED backlight for a liquid crystal display according to an embodiment of the present invention.

[0026] Such as figure 2 As shown, the LED backlight according to the embodiment of the present invention includes: a boost circuit 210 , a plurality of LED strings 220 connected in parall...

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Abstract

The invention discloses an LED (light-emitting diode) backlight source. The LED backlight source comprises a boosted circuit (210), a plurality of parallel LED strings (220), an over-current protection circuit (230) and a short-circuit protection circuit (240), wherein the boosted circuit (210) is used for boosting input direct current voltage and outputting boosted direct current voltage; each LED string (220) comprises a plurality of LEDs and a first resistor (221) which are connected in series, and each LED string (220) is used for receiving the boosted direct current voltage from the boosted circuit (210); the over-current protection circuit (230) is used for controlling the output power of the boosted circuit (210) according to the detected resistance; the short-circuit protection circuit (240) is used for controlling and regulating the resistance detected by the over-current protection circuit (230) according to voltages at two ends of the first resistor (221). According to the LED backlight source disclosed by the invention, when the resistor of one LED string is in short circuit, the output power of the boosted circuit is reduced to prevent a circuit device in a driving circuit from being burned up, and the security and reliability of the driving circuit are improved. The invention further discloses a liquid crystal display.

Description

technical field [0001] The invention relates to the field of liquid crystal display; more specifically, it relates to an LED backlight source and a liquid crystal display. Background technique [0002] With the continuous advancement of technology, the backlight technology of liquid crystal displays has been continuously developed. Traditional LCD backlights use cold cathode fluorescent lamps (CCFL). However, due to the shortcomings of CCFL backlight such as poor color reproduction ability, low luminous efficiency, high discharge voltage, poor discharge characteristics at low temperature, and long time for heating to reach a stable gray level, backlight technology using LED backlight has been developed. [0003] In an LED backlight, a plurality of LED strings are arranged behind a liquid crystal panel, wherein each LED string includes a plurality of LEDs connected in series. In order to drive each LED string, a dedicated driving circuit is required to provide a driving vol...

Claims

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Application Information

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IPC IPC(8): G09G3/36G09G3/34H05B44/00
CPCG09G3/3406G09G3/36G09G2330/04Y02B20/30H05B45/38G02F1/133603
Inventor 胡安乐曹丹
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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