Patent ID: 8300170

Claim:
An electro-optical device comprising: a substrate; and a transistor that includes: a gate electrode; a semiconductor film that includes a first source and a first drain; and a channel region that is formed between the first source and the first drain, at least a part of a light-shielding film overlapping with the semiconductor film, the light-shielding film having: a first portion that extends along a first direction; a second portion that protrudes from the first potion along a second direction intersecting the first direction; and a third portion that protrudes from the first portion along a third direction intersecting the first direction, the first portion having a first width along the second direction, the second portion having a second width along the first direction, the third portion having a third width along the first direction, the second portion and the third portion being formed such that the second width is smaller than the third width, and the semiconductor film having a first part, at least a part of the second portion overlapping with the first part, the first part having a fourth width along the first direction, the channel region having a fifth width along the first direction, and the fourth width being greater than the fifth width.