Patent ID: 7193238

Claim:
An image display device driven by thin film transistors formed on a substrate, wherein said thin film transistors are made of a polycrystalline silicon film formed on said substrate, crystal grains of the polycrystalline silicon film are grown in a specific direction within a surface of the silicon film to be long in its growth direction and short in a direction substantially perpendicular thereto, an arrangement direction of a source and drain of the thin film transistors is substantially aligned with a longitudinal direction of said crystal grains, said thin film transistors are divided into blocks each including at least one of the thin film transistors within the surface of the silicon film, at least one of said blocks is present in a periphery of a display pixel array, an arrangement direction of a source and drain of a plurality of thin film transistors included in said block is aligned with a horizontal or vertical direction when viewed from the surface of said silicon film within the same block, and two kinds of said blocks including thin film transistors aligned in a horizontal direction and thin film transistors aligned in a vertical direction, respectively, are mixed when viewed from an identical straight line of the horizontal or vertical direction.