Patent ID: 7786985
Filing Date: 2010-08-31
Classification: G09G,H01L,H03K

Abstract:
1. A semiconductor device comprising: a first input terminal; a second input terminal; a first wiring; a second wiring; a first thin film transistor; a second thin film transistor; a third thin film transistor; and a fourth thin film transistor, wherein one of a source and a drain of the first thin film transistor is connected to one of a source and a drain of the second thin film transistor, the other of the source and the drain of the first thin film transistor is connected to the first wiring, and the other of the source and the drain of the second thin film transistor is connected to the second wiring, wherein one of a source and a drain of the third thin film transistor is connected to a gate of the first thin film transistor, and the other of the source and the drain of the third thin film transistor is connected to the second wiring, wherein a gate of the third thin film transistor is connected to a gate of the second thin film transistor, wherein one of a source and a drain of the fourth thin film transistor is connected to the gate of the first thin film transistor, and the other of the source and the drain of the fourth thin film transistor is connected to a gate of the fourth thin film transistor, wherein the first input terminal is connected to the gate of the fourth thin film transistor, and the second input terminal is connected to the gate of the third thin film transistor, wherein the first thin film transistor, the second thin film transistor, the third thin film transistor and the fourth thin film transistor have amorphous semiconductor layers, and wherein the first thin film transistor, the second thin film transistor, the third thin film transistor and the fourth thin film transistor are n-type transistors.