Patent ID: 6897619

Claim:
A control circuit comprising: a plurality of drive current output circuit groups, each of which includes at least one drive current output circuit; a control voltage generating circuit which has an output node; a voltage divider which has a plurality of control voltage outputting nodes and a plurality of resistance elements, wherein each of said resistance elements is connected between the respective control voltage outputting nodes, wherein the plurality of control voltage outputting nodes including a first end node which is located at one end of the voltage divider and a second end node which is located at the other end of the voltage divider, wherein the first end node is connected to the output node of the control voltage generating circuit, and wherein each of the control voltage outputting nodes supplies a control voltage to the respective drive current output circuit groups; a first current output circuit which outputs a first current based on the voltage of the first end node; a second current output circuit which outputs a second current based on the voltage of the second end node; and a compensation voltage generating circuit which outputs a compensation voltage to the second end of the voltage divider, wherein the compensation voltage compensates a difference between the first current and the second current.