Patent ID: 8415668

Claim:
A liquid crystal display device comprising: a first substrate; a thin film transistor over the first substrate, the thin film transistor comprising: a gate electrode over the first substrate; a semiconductor film having a channel forming region over the gate electrode; a source electrode and a drain electrode over the semiconductor film; a pixel electrode electrically connected to the thin film transistor; a first wiring over the first substrate; a second wiring over the first wiring; a convex portion overlapped with the first wiring; a second substrate opposite to the first substrate; and a light shielding portion located between the thin film transistor and the second substrate, wherein the first wiring comprises a same material as a material of the gate electrode, wherein each of the second wiring and the convex portion comprises a same material as a material of the source electrode and the drain electrode, wherein the second wiring has a lamination structure comprising at least two conductive layers, wherein the convex portion is island-shaped, and wherein the channel forming region overlaps with the light shielding portion, and does not overlap with the pixel electrode.