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:
Dec. 02, 2025
Filed:
Sep. 20, 2023
Rohm Co., Ltd., Kyoto, JP;
Masaaki Nakayama, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A light-emitting element driving device () includes: a first external terminal (SET terminal) connectable to a first setting resistor (Rset); a second external terminal (SET_TH terminal) connectable to a first thermistor (TH) with a negative coefficient arranged beside a light-emitting element light source (); a current setter () that generates a setting current (Iset) based on the resistance value of the first setting resistor; a current adder () that generates an addition current (Iadd) with a negative coefficient to the resistance value of the first thermistor; and a current driver () that generates an output current (Iout) that passes through the light-emitting element light source connected between an application terminal for a supply voltage (Vin) and a ground terminal based on a reference current (Iref) which is the sum of the setting current and the addition current.