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:
Oct. 23, 2012
Filed:
Apr. 14, 2008
Applicant:
Tetsuya Hamada, Osaka, JP;
Inventor:
Tetsuya Hamada, Osaka, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 37/02 (2006.01); H05B 39/04 (2006.01); H05B 41/36 (2006.01); G06F 1/00 (2006.01); H05B 39/02 (2006.01); G09G 5/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
A backlight device () that emits illumination light toward the exterior includes a white light-emitting diode () that emits white light, and a LED lighting circuit (lighting control section) () configured to be capable of controlling a lighting drive of the light-emitting diode () by using PWM dimming. The LED lighting circuit () adjusts a color tone of the illumination light by modifying ON time of a duty ratio by PWM dimming and a value of supply current to be supplied to the light-emitting diode ().