Patent ID: 9412762
Filing Date: 2016-08-09
CPC Classification: G09G,H01L,H02M,H03K

Claim Text:
1. A semiconductor device comprising: a control circuit comprising: a second transistor; and a first output terminal, wherein a first terminal of the first transistor is electrically connected to the operational amplifier, wherein an output terminal of the operational amplifier is electrically connected to a gate of the second transistor, wherein a first terminal of the second transistor is electrically connected to the first output terminal, wherein the first transistor comprises a first oxide semiconductor film comprising a channel formation region, wherein the second transistor comprises a second oxide semiconductor film comprising a channel formation region, wherein each of the first oxide semiconductor film and the second oxide semiconductor film comprises In, M, and Zn, wherein an atomic ratio of In to M in the second oxide semiconductor film is higher than an atomic ratio of In to M in the first oxide semiconductor film, and wherein M is at least one of Ga, Y, Zr, La, Ce, and Nd.