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:
Dec. 18, 2007
Filed:
Dec. 13, 2005
Chun-ching Wei, Taipei, TW;
Yang-en Wu, Taipei, TW;
Wei-cheng Lin, Wurih Township, Taichung County, TW;
Chun-Ching Wei, Taipei, TW;
Yang-En Wu, Taipei, TW;
Wei-Cheng Lin, Wurih Township, Taichung County, TW;
AU Optronics Corporation, Hsinchu, TW;
Abstract
A shift register in an amorphous-silicon gate driver comprises a pull-up transistor and two pull-down modules. The pull-up transistor produces a positive pulse when the clock signal is high and the gate of the pull-up transistor is also high. The gate of the pull-up transistor is pulled down to a negative voltage level Vss by two pull-down transistors in the pull-down modules. Each pull-down module also has a further pull-down transistor to keep the output terminal at Vss after the output pulse is produced. The two pull-down modules are operated in a cooperative manner so that each pull-down transistor is conducting approximately 50% of the time. The gates of the pull-down transistors are kept at a positive voltage level approximately 50% of the time and at Vss' approximately 50% of the time with Vss′ being more negative than Vss.