Patent ID: 7319447

Claim:
A pixel driving circuit for use in an active matrix electron luminescent display, switched between a memorizing state and an emission state according to operations of a first and a second scan lines, comprising: a transistor; a capacitor having a first and a second ends coupled to the gate electrode of said transistor and a ground voltage, respectively; an organic light-emitting diode having a P and an N electrodes coupled to the source electrode of said transistor and said ground voltage, respectively; a first switch unit having a first and a second ends coupled to a data line and the drain electrode of said transistor, respectively, and a first control end coupled to said first scan line; and a second switch unit having a third and a fourth ends coupled to the drain electrode and the gate electrode of said transistor, respectively, and a second control end coupled to said first scan line, wherein said capacitor is charged by a driving current received from said data line to generate a specified voltage to bias said transistor and said organic light-emitting diode in said memorizing state, and said transistor and said organic light-emitting diode are further biased with said specified voltage in said emission state.