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1. (WO2017201786) DIRECT CURRENT VOLTAGE CONVERSION CIRCUIT AND LIQUID CRYSTAL DISPLAY APPARATUS

Pub. No.:    WO/2017/201786    International Application No.:    PCT/CN2016/086785
Publication Date: Fri Dec 01 00:59:59 CET 2017 International Filing Date: Thu Jun 23 01:59:59 CEST 2016
IPC: H02M 3/156
G09G 3/36
Applicants: SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.
深圳市华星光电技术有限公司
Inventors: CAO, Dan
曹丹
Title: DIRECT CURRENT VOLTAGE CONVERSION CIRCUIT AND LIQUID CRYSTAL DISPLAY APPARATUS
Abstract:
A direct current voltage conversion circuit (10) and a liquid crystal display apparatus (1), the direct current voltage conversion circuit (10) comprising a voltage doubler circuit (100) and a protection circuit (300); when the voltage doubler circuit (100) implements EOS testing, a detection circuit (310) obtains a second detection voltage on the basis of the voltage of a VGH line, a first adjustment circuit (330) generates a third signal on the basis of comparison results of the second detection voltage with a reference voltage, and a second adjustment circuit (340) generates a fourth signal on the basis of comparison results of the second detection voltage with the reference voltage, the third signal adjusting the equivalent resistance of a first feedback branch (320) to a third equivalent resistance, and the fourth signal adjusting the equivalent resistance of a second feedback branch (350) to a fourth resistance; by means of adjusting the equivalent resistance of the first feedback branch (320) and the second feedback branch (350), the voltage of the VGH line returns to the voltage before loading the testing signal.