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. 27, 2003
Filed:
Sep. 20, 2000
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An image display device has a first look-up table memory ( ) for correcting a gamma curve of an input video signal so as to correct a gradation of a display image, a second look-up table memory ( ) for generating uniformity correction data on a screen at each gradation level, and a positional information generating portion ( ) for generating uniformity correction data corresponding to a position on the screen. A correction data making portion ( ) synthesizes the uniformity correction data output from the second look-up table memory ( ) and the uniformity correction data output from the positional information generating portion ( ). An arithmetic processing circuit ( ) corrects the video signal that has been subjected to the gradation correction and read out from the first look-up table memory ( ) by using the uniformity correction data output from the correction data making portion ( ), and the uniformity correction of the display image is performed at all gradation levels.