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:
Jul. 23, 2019
Filed:
Mar. 02, 2018
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Akiko Furuya, Yokohama, JP;
Nobuaki Kawasoe, Yokohama, JP;
Tomoki Katou, Kawasaki, JP;
Hiromi Fukino, Kawasaki, JP;
Yusuke Ujiie, Kawasaki, JP;
Shuhei Hatae, Kawasaki, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A drive circuit for supplying a drive current to light emitting elements includes an output circuit that sets a magnitude of the drive current based on an assumed value of a threshold current being a threshold value of the drive current, an acquisition circuit that acquires an optical-output monitor value indicating a magnitude of an optical output of the light emitting elements, a first calculation circuit that calculates an average value of the drive current in a predetermined period in a frame period as an average drive current value for each of the predetermined period, a second calculation circuit that calculates an average value of the optical-output monitor values in the predetermined period as an average optical-output monitor value, and an adjustment circuit that adjusts the assumed value of the threshold current value based on the average drive current value and the average optical-output monitor value.