Patent ID: 8587575

Claim:
A driving method for a display device including a display panel that is supplied with a power source voltage, and includes a plurality of light emitting elements, the display device including a saturation region and a non-saturation region according to variation of a panel current flowing to the display panel, the driving method comprising: sensing the panel current; determining the power source voltage and the panel current; controlling a feedback voltage to drive the power source voltage to be equal to a saturation voltage corresponding to a saturation point at a boundary between the saturation region and the non-saturation region based on the determined power source voltage and the determined panel current, wherein controlling the feedback voltage includes: varying the power source voltage to be different levels; storing the power source voltage and the panel current according to the different power source voltage levels; setting a reference point defined by a predetermined power source voltage and a panel current corresponding to the predetermined power source voltage and a plurality of first comparison points defined by a plurality of the power source voltages at different levels and the panel currents respectively corresponding thereto; calculating differential coefficients between the plurality of first comparison points and the reference point from the reference point in a descending order; calculating differential coefficients between the plurality of first comparison points and the reference point from the reference point in an ascending order; comparing the differential coefficients calculated in the descending order with the corresponding differential coefficients calculated in the ascending order; determining a point between two of the first comparison points for which a differential coefficient calculated in the descending order becomes smaller than a differential coefficient calculated in the ascending order to be a saturation point; and determining a power source voltage corresponding to the saturation point to be the saturation point; and controlling the power source voltage according to the feedback voltage to supply the controlled power source voltage to each of the plurality of light emitting elements.