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:
Nov. 23, 2010
Filed:
May. 13, 2009
Shuji Inoue, Okayama, JP;
Shuji Inoue, Okayama, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Laser driving apparatus in which a temperature is controlled such that an optical output is maximum, even when a laser device using an optical wavelength conversion element is used in a backlight source of a liquid crystal display that adjusts light dynamically. Current detection sectiondetects an average value of a driving current by which laser deviceis pulse-driven. Optical detection sectiondetects an average value of an optical output from laser device. Efficiency detection sectioncalculates a ratio of an output from optical detection sectionto an output from current detection section. A temperature setting value at which an efficiency value which is a result of the computation is maximum is provided to temperature control sectionand a temperature of nonlinear optical crystalof laser deviceis controlled, whereby laser deviceis driven such that the optical output from laser deviceis always maximum.