Patent ID: 8139006
Filing Date: 2012-03-20
Classification: G09G

Abstract:
1. A power source for applying a voltage to a pixel circuit having first and second power lines coupled thereto, the first power line applying a first voltage that is higher than a second voltage applied by the second power line, the first power line supplying the first voltage to an anode of a light emitting element in the pixel circuit, the power source comprising: a sensing unit; and a controlling unit, wherein: the sensing unit senses a current flowing to the pixel circuit, and the controlling unit increases the first voltage applied to the first power line until the sensed current is greater than a reference and then decreases the first voltage applied to the first power line so as to bring the sensed current down, the controlling unit increasing the first voltage applied to the first power line by a first amount when the sensed current is lower than the reference, and subsequently decreasing the first voltage applied to the first power line by a second amount to decrease the sensed current from a first level higher than the reference to a second level that is closer to the reference, the second amount being less than the first amount, an absolute value of increments to the first voltage applied to the first power line being larger than an absolute value of decrements to the first voltage applied to the first power line.