Control circuit for supplying a current to display devices

A control circuit comprising:

• a first drive current output circuit which has a first, a second and a third nodes, wherein the first power supply voltage is supplied from the first node and a first drive current is outputted from the third node;
• a second drive current output circuit which has a first, a second and a third nodes, wherein the first power supply voltage is supplied from the first node and a second drive current is outputted from the third node;
• a control voltage generating circuit which is located near the first current output circuit, the control voltage generating circuit has an output node which outputs a first control voltage to the second node of the first drive current output circuit and a second control voltage to the second node of the second drive current output circuit via a resistor element;
• a first current output circuit which outputs a first detected current based on the first control voltage;
• a second current output circuit which outputs a second detected current based on the second control voltage;
• and
• a compensation voltage generating circuit which outputs a compensation voltage to the second current output circuit, so as to equalize the first control voltage and the second control voltage.

A control circuit comprising:

• a plurality of drive current output circuit groups each of which includes at least one drive current output circuit;
• a voltage divider which has a plurality of control voltage outputting nodes each of which is divided by a resistance element each other, 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 each of the control voltage outputting node supplies a control voltage to the respective drive current output circuit group;
• a first converter which outputs a control voltage of the first end node based on a first reference current;
• a second converter which outputs a control voltage of the second end node based on a second reference current;
• and
• a reference current generator which includes an operational amplifier, the reference current generator controls the first current and the second current to be approximately equal.