Patent ID: 8531491
Filing Date: 2013-09-10
Classification: H05B,Y02B

Abstract:
1. A control circuit for an organic light emitting diode panel comprising: a plurality of first digital to analog converter circuits controlling currents in corresponding channels, on each of which is provided a light emitting diode, respectively, wherein the first digital to analog converter circuits are grouped into W sets, each of which has Q digital to analog converter circuits; and W current sources supplying current amounts, which are controlled by corresponding reference voltages, respectively, each current source including a corresponding current mirror circuit proportionally mirroring the current amount supplied by a corresponding one of said W current sources into a corresponding set of said Q digital to analog converter circuits, wherein the W current sources are grouped into M sets, each of which has N current sources (W=M×N), and the reference voltages in the current sources of the same group are controlled in such a manner that N×Q channels are matched with one another in current amount, where M, N, Q, and W are integers, and N, Q, and W are greater than or equal to 2, wherein each set of said M sets of current sources is controlled by a corresponding matching device, and a total of M matching devices are matched with one another.