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LED light source short-circuit detection method and device, LED backlight and liquid crystal display device

A LED light source and short-circuit detection technology, which is applied in the display field, can solve problems such as high cost and complex structure, and achieve the effects of short detection time, high detection efficiency, and prevention of circuit overvoltage breakdown

Active Publication Date: 2013-10-09
GUANGDONG HISENSE ELECTRONICS CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] like figure 1 The LED light source shown includes an LED light bar and a PWM controller 12, and several LEDs 11 are arranged on the LED light bar. In order to realize the short circuit detection of each LED in the LED light bar, the existing method is to add a diode 13 and Short-circuit detection unit 14; wherein said short-circuit detection unit 14 is a hardware circuit made up of various electronic components, with complex structure and high cost

Method used

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  • LED light source short-circuit detection method and device, LED backlight and liquid crystal display device
  • LED light source short-circuit detection method and device, LED backlight and liquid crystal display device
  • LED light source short-circuit detection method and device, LED backlight and liquid crystal display device

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Embodiment Construction

[0065] The LED light source short-circuit detection method and device, LED backlight and liquid crystal display device according to the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0066]The LED light source usually includes a light-emitting diode and a power supply or a power interface. The light-emitting diode emits light after it is turned on, and a certain conduction voltage drop will be formed when it is turned on. When the LED in the LED light bar of the LED light source is short-circuited, There is no voltage drop or a very small voltage drop on the corresponding short-circuited LED, so when there is a short-circuit of the LED lamp, the required voltage drop of the corresponding LED light bar will decrease as a whole, and the conduction voltage will decrease. The short-circuit detection of the LED light source in the present invention The method and device, the LED backlight and the liquid crystal disp...

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Abstract

The invention discloses an LED light source short-circuit detection method and device, an LED backlight and a liquid crystal display device. The LED light source short-circuit detection method and device aims to simplify the short-circuit detection of an existing LED light source. The LED light source short-circuit detection method is applied to the backlight of the liquid crystal display device, wherein the backlight comprises a plurality of LED lamp strips. The LED light source short-circuit detection method comprises the following steps of inputting M unequal detection voltages to each LED lamp strip; receiving and recording breakover feedback of each LED lamp strip at under each detection voltage; judging whether LED lamps are short-circuited in each LED lamp strip according to the breakover feedback, wherein M is an integer which is not smaller than 1, and the maximum detection voltage is not larger than the normal working voltage of each LED lamp strip. The LED light source short-circuit detection method and device is used for the short-circuit detection of the LED light source, and has the advantages of being easy and convenient to achieve, fast in achievement, sensitive in detection and the like.

Description

technical field [0001] The invention relates to the display field, in particular to a method and device for detecting a short circuit of an LED light source, an LED backlight, and a liquid crystal display device. Background technique [0002] Such as figure 1 The LED light source shown includes an LED light bar and a PWM controller 12, and several LEDs 11 are arranged on the LED light bar. In order to realize the short-circuit detection of each LED in the LED light bar, the existing method is to add diodes 13 and A short circuit detection unit 14; wherein the short circuit detection unit 14 is a hardware circuit composed of various electronic components, which has a complex structure and high cost. Contents of the invention [0003] (1) Purpose of the invention [0004] In view of the above problems, the present invention aims to provide a brand new, simple in structure, low cost LED light source short circuit detection method and device, LED backlight and liquid crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/03G09G3/00
Inventor 张玉欣
Owner GUANGDONG HISENSE ELECTRONICS CO LTD
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