Patent ID: 7911461
Filing Date: 2011-03-22
Classification: G09G

Abstract:
1. A current distributor for distributing the current evenly through a plurality of rows of light-emitting diodes, each respectively being coupled between a supply pin and a first current pin, said first current pin being coupled to said current distributor, said current distributor being coupled to a total current pin, said current distributor comprising: a first resistor having a first end and a second end, said first end being coupled to said supply pin; a second resistor having a third end and a fourth end, said third end being coupled to said supply pin; a plurality of first clamp circuitries being coupled to said second end of said first resistor and said first current pin; a comparator having first and second input terminals and an output terminal, said first input terminal being coupled to said second end of said first resistor, said second input terminal being coupled to said fourth end of said second resistor; a second clamp circuitry coupled between said fourth end of said second resistor and said total current pin; and a plurality of first transistors having a first terminal, a second terminal and a gate, said first terminal being coupled to said first current pin, said gate being coupled to said output terminal of said comparator, and said second terminal being coupled to said total current pin.