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:
Aug. 20, 2002
Filed:
Dec. 08, 2000
Tomoaki Nakao, Yamatokooriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
There is provided a gray scale display reference voltage generating circuit that can change a gamma correction characteristic in accordance with a liquid crystal material and LCD panel characteristics. Resistor elements R through R have a resistance ratio for gamma correction and generate gamma-corrected intermediate voltages on the basis of voltages across both input terminals V and V A gamma correction adjustment circuit adjusts the gamma-corrected intermediate voltages upward or downward on the basis of adjustment data latched in a data latch circuit By thus supplying the adjustment data corresponding to the liquid crystal material and the LCD panel characteristics to the data latch circuit the gamma correction characteristic can be changed in accordance with the liquid crystal material and the LCD panel characteristics without modifying the design of a source driver.