Patent ID: 8193733

Claim:
A novel LED driver circuit, comprising: a current regulation circuit, having a first end and a second end, wherein a first current is flowing into said second end, and a voltage difference between said first end and said second end is generated according to said first current in a way that said voltage difference becomes larger/smaller as said first current decreases/increases; a transistor, having a first end, a second end, and a third end, wherein said second end is coupled with said first end of said current regulation circuit, and said third end is coupled with said second end of said current regulation circuit; a bias network, having a first end and a second end, said second end being coupled with said second end of said transistor; and a LED module, having at least two connection nodes, wherein the connection node at one end of said LED module is coupled to a line voltage, the connection node at the other end of said LED module is coupled to said first end of said transistor, and one of said at least two connection nodes is coupled with said first end of said bias network.