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:
Dec. 12, 2006
Filed:
Feb. 03, 2005
Shinobu Adachi, Yonezawa, JP;
Shinobu Adachi, Yonezawa, JP;
Tohoku Pioneer Corporation, Yamagata, JP;
Abstract
After a command signal corresponding to a gradation whose light emission is controlled is outputted from a controller IC, based on this, a combination of respectively different intensity conversion data are extracted from a linear data tableand a γ correction data table. The respective intensity conversion data are analog converted by a first DACand a second DAC, and these are converted into a voltage level of a mean value by resistors R, Rand an addition circuit. By this voltage level of the mean value, an absorption current in a current mirror circuitis controlled, and as a result, a drive current accompanied by γ correction for the light emitting elements can be obtained by the current mirror circuit. The first DACand the second DAChandle relatively simple intensity conversion data obtained from the linear data tableand the γ correction data tableand analog convert such data. Therefore, a light emission control circuit accompanied by γ correction can be realized without enlarging the circuit scale.