Semiconductor device

摘要

Solved is a problem of attenuation of output amplitude due to a threshold value of a TFT when manufacturing a circuit with TFTs of a single polarity. In a capacitor (105), a charge equivalent to a threshold value of a TFT (104) is stored. When a signal is inputted thereto, the threshold value stored in the capacitor (105) is added to a potential of the input signal. The thus obtained potential is applied to a gate electrode of a TFT (101). Therefore, it is possible to obtain the output having a normal amplitude from an output terminal (Out) without causing the amplitude attenuation in the TFT (101).

主权项

1. A semiconductor device comprising:
first, second, third and fourth transistors and a capacitor; wherein the first, second, third and fourth transistors are the same conductivity type, wherein a first electrode of the capacitor is electrically connected to a gate of the first transistor, wherein the first electrode of the capacitor is electrically connected to a gate of the fourth transistor, wherein the first electrode of the capacitor is electrically connected to one of source and drain of the third transistor, wherein a second electrode of the capacitor is electrically connected to one of source and drain of the fourth transistor, wherein a gate of the second transistor is electrically connected to a first signal input terminal, wherein one of source and drain of the first transistor is electrically connected to a signal output terminal, wherein the one of source and drain of the first transistor is electrically connected to one of source and drain of the second transistor, wherein the one of source and drain of the first transistor is electrically connected to the other of source and drain of the third transistor, and wherein the other of source and drain of the second transistor is electrically connected to a first power supply line.