US Patent No. 11,032,881

CONTROLLER FOR CONTROLLING LIGHT SOURCE MODULE


Patent No. 11,032,881
Issue Date June 08, 2021
Title Controller For Controlling Light Source Module
Inventorship Rong Hu, Beijing (CN)
Yung-Lin Lin, Palo Alto, CA (US)
Hiroshi Yamazaki, Tokyo (JP)
Naoyuki Fujita, Tokyo (JP)
Assignee O2Micro Inc., Santa Clara, CA (US)

Claim of US Patent No. 11,032,881

1. A controller operable for controlling a light source module comprising a first Light-Emitting Diode (LED) array and a second LED array, wherein said first LED array comprises a first plurality of LED strings and said second LED array comprises a second plurality of LED strings, said controller comprising:a power input terminal, operable for receiving electric power from a power converter;
a first power output terminal, coupled to said first LED array,
a second power output terminal, coupled to said second LED array,
a plurality of current sensing terminals, coupled to said first LED array and to said second LED array, operable for sensing a current of each LED string in said first LED array and for sensing a current of each LED string in said second LED array,
wherein anodes of said first plurality of LED strings are connected to a first common node, wherein said first common node is connected to said first power output terminal,
wherein anodes of said second plurality of LED strings are connected to a second common node, wherein said second common node is connected to said second power output terminal,
wherein a cathode of a first LED string in said first LED array and a cathode of a first LED string in said second LED array are connected to a third common node, wherein said third common node is connected to a first current sensing terminal of said current sensing terminals,
wherein said controller is operable for delivering said electric power to said first LED array via said first power output terminal in a first sequence of discrete time slots, and for delivering said electric power to said second LED array via said second power output terminal in a second sequence of discrete time slots, wherein said first sequence of discrete time slots and said second sequence of discrete time slots are mutually exclusive.