| 摘要 |
PURPOSE:To provide a liquid crystal driving semiconductor device which is prevented from optical leakage, by a method wherein patterning of a metal layer provided for optical shielding is operated by laser beam so that an aperture area is made minimum. CONSTITUTION:After a P<+> diffusion layer 22, a field oxide film 23 and a gate oxide film 24 are formed on a P type single crystal silicone substrate 21, a polycrystalline silicone layer 25 is formed. Then an N<+> diffusion layer 26, which is to become source and drain, is formed, a layer, insulation film 27 is formed and an aperture as a contact hole is made. The surface is covered with Al or Al-alloy overall. Then Al or Al-alloy is patterned to the prescribed pattern by laser beam so that a video signal line wiring 28 and a liquid crystal driving electrode 29 are formed. Because the laser beam can be focused to a small diameter, the area of the aperture can be minimum so that the optical leakage current can be eliminated. |
