| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce deterioration of the display quality of an image resulting from ripple components generated in a power source circuit. <P>SOLUTION: In the driving device of a light emitting display panel, ripple components superimposed on an operation power source Va which is applied on the source electrode of a light emission driving transistor Tr2 are extracted by a ripple component extracting circuit 14 to be supplied to the input end of one side of a voltage adding circuit 15. A data voltage Vdata which is transferred via a data line is entered to the input end of the other side of the circuit 15. The output of the circuit 15 is supplied to a scanning selection transistor Tr1 shown by a sign SW1 as a Vgate. The Vgate is supplied to the gate of the light emission driving transistor Tr2 when the transistor Tr1 is turned on in addressing. As a result, a voltage Vgs between the gate and the source in the transistor Tr2 always shows a roughly constant value regardless of timing of the addressing. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
