Patent ID: 8314514
Filing Date: 2012-11-20
Classification: G02F,G11C,H01L,H03K

Abstract:
1. A liquid crystal display device comprising: a first transistor; a second transistor; a third transistor; a fourth transistor; a first capacitor; a second capacitor; and a wiring, wherein one of a source and a drain of the first transistor is electrically connected to a gate of the first transistor, wherein the first transistor and the third transistor are electrically connected in series between the wiring and a gate of the second transistor, wherein one terminal of the first capacitor is electrically connected to a first terminal, wherein the gate of the second transistor is electrically connected to the other terminal of the first capacitor, wherein one of a source and a drain of the second transistor is electrically connected to a second terminal and the other one of the source and the drain of the second transistor is electrically connected to the wiring, wherein one terminal of the second capacitor is electrically connected to the first terminal, wherein a gate of the fourth transistor is electrically connected to the other terminal of the second capacitor, and wherein one of a source and a drain of the fourth transistor is electrically connected to the second terminal.