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:
Feb. 04, 2020
Filed:
Oct. 09, 2018
Applicant:
Sharp Kabushiki Kaisha, Sakai, Osaka, JP;
Inventors:
Takayuki Shimizu, Sakai, JP;
Yoshiki Ikuta, Sakai, JP;
Hideki Sato, Sakai, JP;
Takuma Hiramatsu, Sakai, JP;
Assignee:
SHARP KABUSHIKI KAISHA, Sakai, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 33/08 (2006.01); G09G 3/32 (2016.01); H05B 37/02 (2006.01);
U.S. Cl.
CPC ...
H05B 33/0815 (2013.01); G09G 3/32 (2013.01); H05B 33/0827 (2013.01); H05B 33/0851 (2013.01); H05B 33/0854 (2013.01); H05B 37/02 (2013.01); H05B 37/0227 (2013.01);
Abstract
There is provided a VCSEL drive circuit that causes a VCSEL to emit pulsed light in a light emission period, including a drive adjustment unit that adjust a first voltage which is a voltage of drains of a PMOS transistor and an NMOS transistor in a constant current circuit and a second voltage which is a voltage of a drain of an NMOS transistor that drives the VCSEL to be the same voltage in a pre-light emission period before the light emission period.