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:
Aug. 14, 2007
Filed:
Aug. 09, 2005
Takaaki Ishii, Osaka, JP;
Nobuyuki Ohtaka, Osaka, JP;
Takaaki Ishii, Osaka, JP;
Nobuyuki Ohtaka, Osaka, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
An LED control circuit for controlling a plurality of LEDs with different emission colors comprises a counter which increments or decrements a count value at a predetermined clock in response to a count start signal externally supplied, a signal conversion circuit which converts the count value into an analog signal displaying intensity corresponding to the count value and outputs the analog signal as an output signal, a signal generation circuit which generates, based on the output signal from the signal conversion circuit and brightness data externally specified to its corresponding LED, an analog signal displaying intensity corresponding to a product of the output signal and the brightness data, and a driving circuit which drives its corresponding LED according to the analog signal output from the signal generation circuit, to gradually and simultaneously change the brightness of the LEDs in accordance with the count value.