ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,452,974, issued on Oct. 21, was assigned to Rohm Co. Ltd. (Kyoto, Japan).
"Light emitting element driving device" was invented by Toru Takahashi (Kyoto, Japan), Kei Nagao (Kyoto, Japan) and Masaaki Nakayama (Kyoto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "In a normal mode in which light emission control of the light emitting element is performed by a dimming controller (15), if no communication signal from an external microprocessor (35) is recognized beyond a first predetermined period, the control logic circuit (10) shifts from the normal mode to a first limp home mode (limp home 2 mode). In the first limp home mode, the dimming controller...