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:
Sep. 02, 2025
Filed:
Sep. 19, 2023
Rohm Co., Ltd., Kyoto, JP;
Masaaki Nakayama, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A light-emitting element driving circuit () includes: a first buffer () provided between the transmission terminal (B) and the communication circuit (), with the output side of the first buffer connected to the transmission terminal and the input side of the first buffer connected to the communication circuit; and a determination circuit () configured to determine whether the controller () is connected or not based on a first signal (S) at the output terminal of the first buffer and a second signal (S) at the input terminal of the first buffer. If the determination circuit determines that the controller is not connected, the communication circuit is disabled from processing the signal received via the reception terminal (A), and the dimming signal generator () generates the dimming signal (Spwm) based on a pulse signal (Sp) fed to the reception terminal or the transmission terminal.