US 12,446,132 B2
LED driving device, LED light source device, and vehicle onboard display device
Ryosuke Kanemitsu, Kyoto (JP); and Koji Katsura, Kyoto (JP)
Assigned to Rohm Co., Ltd., Kyoto (JP)
Filed by ROHM CO., LTD., Kyoto (JP)
Filed on Nov. 17, 2023, as Appl. No. 18/512,462.
Application 18/512,462 is a continuation of application No. PCT/JP2022/019522, filed on May 2, 2022.
Claims priority of application No. 2021-088083 (JP), filed on May 26, 2021.
Prior Publication US 2024/0090100 A1, Mar. 14, 2024
Int. Cl. H05B 45/30 (2020.01); H05B 45/325 (2020.01); H05B 45/345 (2020.01); H05B 45/50 (2022.01)
CPC H05B 45/50 (2020.01) [H05B 45/325 (2020.01); H05B 45/345 (2020.01)] 18 Claims
OG exemplary drawing
 
1. An LED driving device, comprising:
a plurality of LED terminals to have connected thereto cathodes of LEDs in a plurality of channels respectively;
a lowest voltage input terminal;
a lowest voltage output terminal; and
a selector,
wherein
when the lowest voltage input terminal is used, the selector selects a lowest voltage among voltages at the plurality of LED terminals and a voltage at the lowest voltage input terminal, to output the lowest voltage from the lowest voltage output terminal, and
when the lowest voltage input terminal is not used, the selector selects a lowest voltage among the voltages at the plurality of LED terminals, to output the lowest voltage from the lowest voltage output terminal.