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:
Apr. 28, 2026
Filed:
Oct. 12, 2023
Qisda Corporation, Taoyuan City, TW;
Chuan-Chu Chen, Taoyuan City, TW;
QISDA CORPORATION, Taoyuan City, TW;
Abstract
The application discloses a projection device comprising: a plurality of optical source modules; and a plurality of optical source driving circuits. Each of the optical source driving circuits includes: an optical source driving unit, for receiving and being controlled by a selection signal and a pulse width modulation signal, the pulse width modulation signal controlling a current amplitude of the drive current from the optical source driving unit to the optical source module; and a delay circuit for controlling the selection signal based on the adjusted threshold voltage to determine when to release the selection signal, the plurality of delay circuits in the plurality of optical source driving circuits release the selection signals synchronously, enabling the plurality of optical source driving circuits to synchronously output the plurality of drive currents to the plurality of optical source modules.