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:
Mar. 31, 2009
Filed:
Jul. 05, 2005
Toshikazu Murata, Kanagawa, JP;
Toshikazu Murata, Kanagawa, JP;
NEC Electronics Corporation, Kanagawa, JP;
Abstract
A gradation voltage selecting circuit includes a plurality of gradation selecting MOS Tr groups, M-pieces half gradation voltage MOS Tr groups, a switching portion and a control portion. Each of the plurality of gradation selecting MOS Tr groups corresponds to one gradation voltage. The M-pieces half gradation voltage MOS Tr groups are connected to each other in series. The control portion supplies a second signal in response to a second display data. The first gradation selecting MOS Tr group selects a first gradation voltage in response to the second signals. The second gradation selecting MOS Tr group selects a second gradation voltage in response to the second signals. The first and second gradation selecting MOS Tr groups and the M-pieces half gradation voltage MOS Tr groups voltage-divide a gradation voltage between the first gradation voltage and the second gradation voltage into (M+2) equal parts in response to the second signal, and generate (M+1)-pieces half gradation voltages. The switching portion selects and outputs one of the (M+1)-pieces half gradation voltages into the display portion in response to the second signal. The (M+1)-pieces half gradation voltages are determined by ON resistance of the first and second gradation selecting MOS Tr groups and the half gradation voltage MOS Tr group.