US 12,035,438 B2
Driving device, light emitting device, and driving method
Naoki Masumitsu, Kumamoto (JP); and Hayato Kamizuru, Kumamoto (JP)
Assigned to SONY SEMICONDUCTOR SOLUTIONS CORPORATION, Kanagawa (JP)
Appl. No. 17/914,021
Filed by SONY SEMICONDUCTOR SOLUTIONS CORPORATION, Kanagawa (JP)
PCT Filed Mar. 5, 2021, PCT No. PCT/JP2021/008775
§ 371(c)(1), (2) Date Sep. 23, 2022,
PCT Pub. No. WO2021/199918, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-061967 (JP), filed on Mar. 31, 2020.
Prior Publication US 2023/0129077 A1, Apr. 27, 2023
Int. Cl. H05B 47/14 (2020.01); G01S 7/497 (2006.01); G01S 17/10 (2020.01)
CPC H05B 47/14 (2020.01) [G01S 7/497 (2013.01); G01S 17/10 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A driving device comprising:
a temperature monitoring circuit that detects a temperature of a drive circuit that drives a light emitting element in a test light emission period of the light emitting element;
a headroom voltage monitoring circuit that detects a headroom voltage of the drive circuit in the test light emission period;
a power supply voltage monitoring circuit that detects a power supply voltage supplied to the light emitting element in the test light emission period; and
a control unit that adjusts the power supply voltage in the test light emission period according to an input/output potential difference of the light emitting element that varies depending on the temperature of the drive circuit to obtain a headroom voltage necessary and sufficient for causing a prescribed drive current to flow through the light emitting element.