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:
Mar. 23, 2021
Filed:
May. 25, 2020
Qisda Corporation, Taoyuan, TW;
Wei-Chun Chang, Taipei County, TW;
Tsung-Hsun Wu, Taoyuan, TW;
Qisda Corporation, Taoyuan, TW;
Abstract
A projection device and a photo coupler circuit for the same are disclosed. The photo coupler circuit includes a logic unit, a number of integration units and a selection unit. The logic unit is configured to receive a number of first control signals and a number of first PWM signals from a main circuit of the projection device, and to output a number of second PWM signals and one or more second control signals according to the first control signals and the first PWM signals. The integration units are coupled to the logic unit. Each of the integration units is configured to generate an integration signal according to one of the second PWM signals. The selection unit is coupled to the integration units to select one of the integration signals to be output to a light source drive circuit of the projection device according to the second control signals.