Patent ID: 8823893

Claim:
A liquid crystal display device comprising: a plurality of pixels arranged in a matrix form, each including: a transistor, switching of which is configured to be controlled by a scan line driver circuit; a liquid crystal element including one terminal to which an image signal is input from a signal line driver circuit through the transistor and the other terminal to which a common potential is supplied, so that voltage corresponding to the image signal is applied; and a capacitor configured to store voltage applied to the liquid crystal element; and a control circuit, wherein the control circuit is configured to control operation of the scan line driver circuit and the signal line driver circuit and is configured to select input of the image signal to each pixel, wherein the transistor includes a channel formation region comprising an oxide semiconductor layer, wherein an amount of leakage of the image signal through the transistor in an off state is smaller than an amount of leakage of the image signal through the liquid crystal element, wherein an off-state current of the transistor is less than or equal to 10 aA/μm at room temperature, and wherein the off-state current of the transistor is less than or equal to 100 aA/μm at a temperature of 85° C.