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:
May. 15, 2001
Filed:
Oct. 05, 1998
Yukihide Ode, Mobara, JP;
Akira Ogura, Nagara-machi, JP;
Kentaro Agata, Mobara, JP;
Kazunari Kurokawa, Mobara, JP;
Takahiro Fujioka, Mobara, JP;
Hiroshi Katayanagi, Chiba, JP;
Mitsuru Goto, Chiba, JP;
Other;
Abstract
A liquid crystal display device is capable of generating gradation voltages for multilevel gradation, such as 256-level gradation, without increasing the chip size of video signal line driving means. The video signal line driving means for applying video signal voltages for multilevel gradation in accordance with m-bit display data is provided with a first gradation voltage generator for generating (2,+1) first gradation voltages, a selector for selecting first gradation voltages adjacent to each other out of (2,+1) first gradation voltages generated by the first gradation voltage generator in accordance with the bit values of high-order n bits of the m-bit display data, while keeping the magnitude relationship between the (2,+1) first gradation voltages unchanged, and a second gradation voltage generator for generating and outputting one of 2,gradation voltages dividing first gradation voltages adjacent to each other into 2,voltages from the first gradation voltages adjacent to each other selected by the selector in accordance with the bit values of low-order (m-n) bits of the display data.