Patent ID: 7189993

Claim:
A display device having a substrate over which a display unit and a peripheral drive unit are integrally formed, the display unit having pixels arranged in a matrix and pixel transistors switching them on and off, said drive unit having peripheral transistors for a drive circuit for scanning the matrix of the pixel transistors, and said pixel transistors and peripheral transistors being comprised of thin-film transistors obtained by stacking polycrystalline semiconductor thin films and gate electrodes with insulating films therebetween, wherein the pixel transistors are formed with a light shielding film between the pixel transistors and the substrate and are formed with an interconnect structure that is a light-sheilding film, the interconnect structure being covered by an inter-layer insulating film with a further light shielding film formed over the inter-layer insulating film; an average crystal grain size of the semiconductor thin film of said pixel transistors and an average crystal grain size of the semiconductor thin film of said peripheral transistors are different.