| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a driving device for a light emitting display panel capable of solving technical problem points arising when fixed-voltage driving and fixed-current driving systems are adopted respectively as a lighting means for the pixels containing driving TFTs and EL elements. <P>SOLUTION: In the driving device for the light emitting display panel, a light emitting power holding capacitor C2 is connected in series to the driving TFT (Tr2) and the EL element E1. The driving device is equipped with a diode D1 for charging electrical charges in the capacitor C2 and a switching element SW2 for supplying current to the diode D1. By an ON operation of the switching element SW2, both ends of the capacitor C2 is subjected to a charge operation so as to become equipotential. By an OFF operation of the switching element SW2, driving current flows in the EL element E1 via the driving TFT (Tr2). The amount of current flowing in the EL element E1 is controlled by the repeating frequency of ON/OFF of the switching element SW2. <P>COPYRIGHT: (C)2004,JPO |
