Patent ID: 7791567

Claim:
A light emitting device, comprising: a plurality of scan lines in a first direction; a plurality of data lines in a second direction different from the first direction; a panel having a plurality of pixels formed on emitting areas that the data lines and the scan lines cross; and a control circuit which detects a gray scale of a first display data and a second display data inputted from outside in sequence and generates a plurality of control signals for controlling a discharge level according to the detected gray scales; a discharging circuit including a plurality of zener diodes and a plurality of variable resistors connected between the data lines and a ground in serial, wherein the discharging circuit selectively discharges the data lines to one of a first discharging level and a second discharging level by changing resistance values of the variable resistors according to the plurality of control signals transmitted from the control circuit during a discharging time; and a pre-charge circuit which provides a pre-charge current to the data lines according to the first and second display data received from the control circuit during a pre-charging time after the discharge time.