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:
Oct. 21, 2025
Filed:
Sep. 13, 2023
Rohm Co., Ltd., Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
In a normal mode in which light emission control of the light emitting element is performed by a dimming controller (), if no communication signal from an external microprocessor () is recognized beyond a first predetermined period, the control logic circuit () shifts from the normal mode to a first limp home mode (limp homemode). In the first limp home mode, the dimming controller sets a light emitting element current set value based on a terminal current set value commensurate with a resistance value of a setting resistor (Rextiset) and a DC dimming set value for each of the channel set in the register (A), controls the current driver () so as to generate a current of the set light emitting element set value, and turns on and off the current driver based on a PWM on-duty for each of the channels set in the register.