Patent ID: 7521711

Claim:
A projection type display device emitting light of a light source to at least one display panel to project an image formed by that display panel to a screen, wherein said display panel comprises a substrate on which a display unit and a peripheral drive unit are integrally formed, said display unit having pixels arranged in a matrix and pixel transistors integrally formed, said drive unit having peripheral transistors of a drive circuit for scanning the matrix of the pixel transistors, and both of said pixel transistors and peripheral transistor being thin film transistors comprising at least one polycrystalline semiconductor thin film, wherein an average crystal grain size of the polycrystalline semiconductor thin film of said pixel transistors and an average crystal grain size of the polycrystalline semiconductor thin film of said peripheral transistors are different, wherein the thickness of the polycrystalline silicon constituting the semiconductor thin film of said pixel transistors is smaller than the thickness of the polycrystalline silicon constituting the semiconductor thin film of said peripheral transistors; wherein the pixel transistors are formed with a first light shielding film between the pixel transistors and the substrate and a second light shielding film formed above the pixel transistors; and wherein source and drain interconnects formed over said pixel transistors function as a third light shielding film, and wherein said second light shielding film is formed over said source and drain interconnects and is electrically connected to one of said source and drain interconnects, and further comprising a substantially transparent pixel electrode formed over said second light shielding film and electrically connected to said second light shielding film.