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LED backlight drive circuit, liquid crystal display device and drive circuit

A backlight drive circuit and backlight drive technology, applied to electrical components, static indicators, instruments, etc., can solve problems such as unreachable, and achieve the effect of simple circuits

Active Publication Date: 2012-08-22
CHANGSHA HKC OPTOELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the PWM is OFF for too long, the charge on the capacitor will still be consumed by the leakage current on the LED. At this time, more energy is needed to charge the LED and the capacitor when the ON time is too short. The required energy cannot be achieved, that is, it cannot work under a smaller dimming cycle

Method used

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  • LED backlight drive circuit, liquid crystal display device and drive circuit
  • LED backlight drive circuit, liquid crystal display device and drive circuit
  • LED backlight drive circuit, liquid crystal display device and drive circuit

Examples

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments.

[0021] The invention discloses an LED backlight driving circuit and a liquid crystal display device based on the LED backlight driving circuit.

[0022] Such as figure 2 As shown, the LED backlight driving circuit includes a power module, an LED light bar coupled to the output end of the power module, a dimming module coupled to the output end of the LED light bar, a comparator, and a switch. The first input terminal SW1 of the switch is coupled to the output terminal of the LED light bar, and the second input terminal SW2 is coupled to a feedback voltage V min ; Its output terminal is coupled to the power supply module through a comparator; the switching switch is switched to the first input terminal when the dimming module is turned on; it is switched to the second input terminal when the dimming module is turned off.

[0023] The power m...

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PUM

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Abstract

The invention discloses an LED backlight drive circuit, a liquid crystal display device and a drive circuit. The LED backlight drive circuit comprises a power supply module, an LED lamp bar coupled with the output end of the power supply module, and a dimming module coupled with the output end of the LED lamp bar; and the LED backlight drive circuit also comprises a selector switch, wherein the first input end of the selector switch is coupled to the output end of the LED lamp bar, the second input end of the selector switch is coupled to a feedback voltage, the output end of the selector switch is coupled to the power supply module, and the selector switch is switched into the first input end when the dimming module is started, and is switched to the second input end when the dimming module is stopped. An LED can normally work in a small dimming period. One selector switch is additionally provided, thus the LED backlight drive circuit is simple so that the area can not be remarkably increased, and the cost is low.

Description

technical field [0001] The invention relates to the field of liquid crystal display, and more specifically relates to an LED backlight driving circuit, a liquid crystal display device and a driving circuit. Background technique [0002] With the maturity of LED technology and the gradual reduction in cost, more and more liquid crystal display devices use LEDs as backlight sources. The driving of LEDs is different from traditional power driving. Generally, pulse width modulation technology (PWM) is used to adjust the brightness. Such as figure 1 As shown, when the LED driver is in the dimming state, when the PWM of the dimming signal is ON, the switch tube at the power supply end conducts and transmits energy to the back-end capacitor CP2 and the LED light bar. When the dimming signal is OFF, the drive circuit Stop working, at this time the LED is also off. [0003] When the PWM is OFF for too long, the charge on the capacitor will still be consumed by the leakage current o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34
CPCH05B45/14H05B45/40
Inventor 杨翔高新明黎飞
Owner CHANGSHA HKC OPTOELECTRONICS CO LTD
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