The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 27, 2020
Filed:
Dec. 04, 2017
Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd., Guangdong, CN;
Wenfang Li, Shenzhen, CN;
Dan Cao, Shenzhen, CN;
SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD., Shenzhen, Guangdong, CN;
Abstract
Disclosed are a DC voltage conversion circuit, a DC voltage conversion method and a liquid crystal display device. The circuit comprises: a boost circuit, a charge pump circuit, and a control circuit; the control circuit is additionally provided with a first current detection module, a second current detection module, and an AND gate Y; a first current Iin the boost circuitis detected by means of the first current detection module, and a high level or a low level is supplied to a first input end of the AND gate Yaccording to the magnitude of the first current I; a second current Iin the charge pump circuitis detected by means of the second current detection module, and a high level or a low level is supplied to a second input end of the AND gate Yaccording to the magnitude of the second current I; when the first current Iis relatively small and the second current Iis relatively large, namely the boost circuitis at a light load and the charge pump circuitis at a heavy load, a level at the output end of the AND gate Yis used to control a switch moduleto increase the switch frequency of the switch module, so that the normal work of the charge pump circuitis ensured, and the stability of the VGH voltage is improved.