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:
Apr. 25, 2000
Filed:
Sep. 23, 1997
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A passive matrix liquid crystal display device which can display high-quality gradation by reducing cross-talk and improving contrast is attained. A driving apparatus comprises a field memory of picture image data for storing picture images being input from outside; a readout circuit of picture image data for reading out each element in a specific column of a matrix of picture image data; a calculation circuit of gradation correction term for calculating a gradation correction term from the readout picture image data; a memory of scan data for storing scan data in advance; a readout circuit of scan data for reading out specific scan data from the memory of scan data; an operation circuit of each element for operating a matrix of signal data based on picture image data of a specific column being read out from the field memory of picture image data and scan data being read out from the memory of scan data; and a field memory of signal data for storing data after being operated.