| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a shift register which can stably operate for a long period of time by preventing fluctuations of transistor characteristics. <P>SOLUTION: This shift register comprises two or more stages RS(1) to RS(n), and each of the stages RS(1) to RS(n) is constituted of six TFTs 1 to 6. In the k-th stage RS(k), the output signal OUTk-1 of the preceding stage (the first stage is supplied with an external start signal Dst) is supplied to the gate of TFT1, and TFT 1 is turned on when the output signal OUTk-1 becomes at high level, and TFTs 2, 5 are turned on and TFT 3 is turned off by outputting a power source voltage Vdd from the drain to the source to accumulate electric charges on a node Ak. Further, TFT 6 is supplied with an output signal OUTk+1 of the next stage RS(k+1) (the n-th stage is supplied with an external end signal Dend), and is turned on when this output signal becomes at high level, to discharge the electric charges accumulated on the node Ak. <P>COPYRIGHT: (C)2007,JPO&INPIT |
