Invention Grant
- Patent Title: Light-emitting element drive circuit and portable electronic instrument
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Application No.: US16155832Application Date: 2018-10-09
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Publication No.: US10555387B2Publication Date: 2020-02-04
- Inventor: Takayuki Shimizu , Yoshiki Ikuta , Hideki Sato , Takuma Hiramatsu
- Applicant: SHARP KABUSHIKI KAISHA
- Applicant Address: JP Sakai, Osaka
- Assignee: SHARP KABUSHIKI KAISHA
- Current Assignee: SHARP KABUSHIKI KAISHA
- Current Assignee Address: JP Sakai, Osaka
- Agency: ScienBiziP, P.C.
- Priority: JP2017-221863 20171117
- Main IPC: H05B33/08
- IPC: H05B33/08 ; G09G3/32 ; H05B37/02

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.
Public/Granted literature
- US20190159309A1 LIGHT-EMITTING ELEMENT DRIVE CIRCUIT AND PORTABLE ELECTRONIC INSTRUMENT Public/Granted day:2019-05-23
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