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
CN103354086AActive Publication Date: 2013-10-16TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
Publication Date
2013-10-16

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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.
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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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