Patent ID: 8164548
Filing Date: 2012-04-24
Classification: G09G

Abstract:
1. A light emitting device comprising: a current source circuit corresponding to a signal line; a first shift register and a second shift register; a latch circuit; and a plurality of reference constant current sources, wherein a plurality of first currents having a plurality of magnitudes corresponding to a plurality of bits respectively is supplied from the plurality of reference constant current sources, wherein the current source circuit is supplied with corresponding one of the first currents of corresponding one of the bits, wherein in the current source circuit, the first current is converted into a voltage according to a first sampling pulse supplied from the first shift register, wherein the voltage is held in a capacitor provided in the current source circuit, wherein a second current corresponding to the voltage is outputted from the current source circuit to the signal line, wherein the latch circuit operates according to a second sampling pulse supplied from the second shift register, and wherein a current value of the second current is controlled by the latch circuit.