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Direct type LED (Light-emitting Diode) backlight source

A LED backlight, direct type technology, applied in the direction of electrical components, instruments, static indicators, etc., can solve the problems of complex circuit and cost increase of liquid crystal display, and achieve the effect of saving cost and reducing circuit complexity

Inactive Publication Date: 2013-03-13
SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of the boost circuit 120, the circuit of the whole liquid crystal display is complicated and the cost increases

Method used

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  • Direct type LED (Light-emitting Diode) backlight source
  • Direct type LED (Light-emitting Diode) backlight source
  • Direct type LED (Light-emitting Diode) backlight source

Examples

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Embodiment Construction

[0029] Various example embodiments will now be described more fully with reference to the accompanying drawings, in which some example embodiments are shown.

[0030] figure 2 A direct type LED backlight according to an embodiment of the present invention is shown.

[0031] Such as figure 2 As shown, the direct-lit LED backlight according to the embodiment of the present invention includes: a power conversion circuit 210 and a plurality of LED strings 230 .

[0032] The power conversion circuit 210 is used to convert the AC mains voltage (for example, 110V or 220V) into a DC voltage (for example, 24V). Here, the power conversion circuit 210 is an AC-DC conversion circuit for providing DC voltage to all DC components in the liquid crystal display device.

[0033] A plurality of LED strings 230 are arranged behind the liquid crystal panel of the liquid crystal display device as a backlight source, and each LED string includes a plurality of LEDs and a resistor R connected i...

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PUM

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Abstract

The invention provides a direct type LED (Light-emitting Diode) backlight source. The direct type LED backlight source comprises a power-switching circuit and a plurality of LED strings which are connected in parallel, wherein the power-switching circuit is used for converting alternating-current voltage from the outside of a liquid crystal display device to direct-current voltage and outputting the direct-current voltage; each LED string comprises a predetermined number of LEDs which are connected in series and is capable of receiving direct-current voltage from the power-switching circuit, wherein the predetermined quantity is restrained, so that the direct-current voltage of each LED emitting light normally in the LED strings is smaller than and equal to the direct-current voltage output by the power-switching circuit. According to the direct type LED backlight source provided by the invention, a booster circuit is not used, so that complexity of a circuit is reduced and cost is lowered.

Description

technical field [0001] The present invention relates to light emitting diode (LED) backlights. More specifically, it relates to a direct type LED backlight source. 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] LED backlight is mainly divided into two types: direct type and photometric type. [0004] The direct LED backlight means that the LED is arranged behind the liquid crystal panel as the backlight. The edge-lit LED backlight means that LEDs are arranged around the edges o...

Claims

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Application Information

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IPC IPC(8): G09G3/34
CPCG09G3/34G09G3/3426H05B45/46
Inventor 陈伟陈辛洪张华
Owner SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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