LOCAL DIMMING backlight drive circuit and electronic device

A technology of backlight driving circuit and driving power supply, which can be used in instruments, static indicators, etc., and can solve the problems of complex circuit design and high cost

Active Publication Date: 2017-05-17
SHENZHEN TCL DIGITAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to propose a LOCAL DIMMING backlight drive circuit and electronic equipment, aiming to solve the problem that the LOCAL DIMMING backlight drive circuit in the prior art uses more drive ICs to simultaneously drive multiple drive switches, resulting in complicated circuit design and cost. higher question

Method used

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  • LOCAL DIMMING backlight drive circuit and electronic device
  • LOCAL DIMMING backlight drive circuit and electronic device
  • LOCAL DIMMING backlight drive circuit and electronic device

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0035] It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second" and ...

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PUM

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Abstract

The invention discloses a LOCAL DIMMING backlight drive circuit and an electronic device; the LOCAL DIMMING backlight drive circuit comprises a current sink, a drive source, a backlight module including a plurality of LED lights arranged in a matrix form, a plurality of power supply selector switches with output ends in one-to-one corresponding connection with anodes of the multiple LED lights, a plurality of drive switches the input end of each which is connected with cathodes of at least two LED lights and the output end of each which is grounded via the current sink, an LED drive module for driving the drive switches to carry out dimming, and a control module for controlling the LED drive module to operate and controlling on/off of the power supply selector switches. The LOCAL DIMMING backlight drive circuit has the advantages that the number of drive ICs (integrated circuits) is decreased and the production cost is decreased.

Description

technical field [0001] The invention relates to the technical field of backlight driving, in particular to a LOCAL DIMMING backlight driving circuit and electronic equipment. Background technique [0002] At present, in the LOCAL DIMMING drive technology, the driver IC generally drives an LED light by adjusting the duty ratio of a drive switch, so that each LED light passes a constant current, thereby changing the brightness of each LED light. [0003] The above-mentioned driving method adopts many driving switches, and the pins of the driving IC are limited, therefore, more driving ICs are needed to drive multiple driving switches at the same time, the circuit design is complicated and the cost is high. Contents of the invention [0004] The main purpose of the present invention is to propose a LOCAL DIMMING backlight drive circuit and electronic equipment, aiming to solve the problem that the LOCAL DIMMING backlight drive circuit in the prior art uses more drive ICs to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34
CPCG09G3/3406G09G3/342
Inventor 杨福军王坚
Owner SHENZHEN TCL DIGITAL TECH CO LTD
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