US 11,895,748 B2
Current control for LED pixel arrays
Zhi Hua Song, Palo Alto, CA (US)
Assigned to Lumileds LLC, San Jose, CA (US)
Appl. No. 17/777,916
Filed by Lumileds LLC, San Jose, CA (US)
PCT Filed Nov. 20, 2020, PCT No. PCT/US2020/061419
§ 371(c)(1), (2) Date May 18, 2022,
PCT Pub. No. WO2021/102214, PCT Pub. Date May 27, 2021.
Claims priority of provisional application 62/938,479, filed on Nov. 21, 2019.
Prior Publication US 2022/0418069 A1, Dec. 29, 2022
Int. Cl. H05B 45/325 (2020.01); H05B 45/14 (2020.01)
CPC H05B 45/325 (2020.01) [H05B 45/14 (2020.01)] 19 Claims
OG exemplary drawing
 
1. A micro-light-emitting diode (LED) array comprising:
a pulse width modulator configured to generate a plurality of pulse width modulation (PWM) signals;
a first power supply line;
a second power supply line; and
a plurality of pixel assemblies, each pixel assembly comprising:
an LED coupled to the first power supply line;
a switching circuit configured to receive a respective, different PWM signal of the plurality of PWM signals and alternately turn on and off the LED according to the received PWM signal; and
a close loop circuit coupled to the second power supply line and configured to regulate an input current provided by the switching circuit to the LED based on a feedback signal.