SEMICONDUCTOR DEVICE AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To improve the opening ratio of the pixel section of an active-matrix liquid crystal display device in which drive circuits such as a shift register, a buffer circuit, etc., are mounted on the same substrate, and at the same time, to provide an optimum TFT constitution. SOLUTION: In a buffer circuit, an n-channel TFT provided with an LDD overlapping a gate electrode is formed, and in the n-channel TFT of a pixel section, an LDD which does not overlap the gate electrode is provided. The retention volume provided in the pixel section is formed of a light shielding film 156, a dielectric film 157 formed on the film 156, and pixel electrodes 160. In particular, the light shielding film 156 is constituted of an aluminum film, and the dielectric film 157 is constituted of an aluminum oxide film formed by anodic oxidation.