Patent ID: 8519990

Claim:
A semiconductor display device comprising: a pixel portion; and a signal line driver circuit comprising a first circuit, a second circuit, and a third circuit, wherein the first circuit is configured to sample serial video signals and to convert the serial video signals to parallel video signals, wherein the second circuit is configured to control timing of the sampled serial video signals by the first circuit, wherein the third circuit is configured to perform signal processing on the parallel video signals, wherein the second circuit comprises a first semiconductor element formed over a first substrate, the first semiconductor element including a first semiconductor layer, wherein the third circuit comprises a second semiconductor element formed over a second substrate, the second semiconductor element including a second semiconductor layer, wherein the pixel portion comprises a third semiconductor element formed over the second substrate, the third semiconductor element including a third semiconductor layer, wherein the first semiconductor layer comprises silicon or germanium, and wherein each the second semiconductor layer and the third semiconductor layer has a wider bandgap than the first semiconductor layer.