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Backlight control circuit and device thereof

A technology for controlling circuits and backlights, applied in instruments, static indicators, etc., can solve the problems of backlight drive circuit design and high power consumption

Active Publication Date: 2015-09-09
浙江美力凯光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a backlight control circuit, aiming to solve the problems of backlight drive circuit design and high power consumption

Method used

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  • Backlight control circuit and device thereof
  • Backlight control circuit and device thereof
  • Backlight control circuit and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] image 3 The circuit structure diagram of the backlight driving control circuit provided by the first embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are listed. The details are as follows: As a preferred embodiment of the present invention, the switch The tube 3021 is an NPN transistor Q1 and an NPN transistor Q1;

[0043] The base of the NPN transistor Q1 is the control terminal of the switch tube 3021, the collector of the NPN transistor Q1 is the high potential terminal of the switch tube 3021, and the emitter of the NPN transistor Q1 is the low potential terminal of the switch tube 3021 .

Embodiment 2

[0045] Figure 4 The circuit structure diagram of the backlight driving control circuit provided by the second embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are listed, and the details are as follows: As a preferred embodiment of the present invention, the switch Tube 3021 is NMOS tube Q2;

[0046] The gate of the NMOS transistor Q2 is the control terminal of the switch transistor 3021 , the drain of the NMOS transistor Q2 is the high potential end of the switch transistor 3021 , and the source of the NMOS transistor Q2 is the low potential end of the switch transistor 3021 .

[0047] The difference between Embodiment 1 and Embodiment 2 of the present invention is that the switch tubes use different types of equipment, both of which can realize the function of the switch tube. The developer selects different equipment according to the design requirements and adjusts the parame...

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PUM

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Abstract

The present invention belongs to the field of backlight control and provides a backlight control circuit and a device thereof. The backlight control circuit comprises a rectifier and filter module which is connected to an AC power supply and is used for filtering the interference signal in the alternating current provided by the AC power supply and converting the alternating current into direct current to output the direct current, a constant current control module whose first input end and second input end are connected to the output end and the grounding end of the rectifier and filter module respectively and is used for controlling the constant current working of a backlight. In the embodiment of the invention, a backlight drive control circuit only comprises the rectifier and filter modules and the constant current control module, the design is simplified, and the working efficiency is improved based on the satisfaction of backlight drive.

Description

technical field [0001] The invention belongs to the field of backlight source control, in particular to a backlight source control circuit and device. Background technique [0002] With the rapid development of the international IT industry, the relevant LCD industry continues to introduce new ones, and the size of LCD products is developing towards diversification and portability. Backlight, as one of the core components of LCD products, is bound to match this development trend and is committed to product diversification. and portability. LCD has always had high requirements on the brightness of the backlight, but the high brightness also makes the power consumption of the LCD remain high. As the most power-consuming accessory in the LCD module, the backlight is no longer suitable for the requirements of portable information products. Increase the brightness of the backlight without increasing the power consumption and then increase the L. The most power-consuming access...

Claims

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Application Information

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IPC IPC(8): G09G3/34
Inventor 刘超
Owner 浙江美力凯光电科技有限公司