Patent ID: 7804550

Claim:
A liquid crystal display device, comprising: an active pattern and a data line formed on a substrate, wherein the active pattern includes a first portion of silicon layer, and the data line is a double layer structure including a first data line pattern formed of a second portion of the silicon layer and a second data line pattern formed of a conductive metal material on the second portion of the silicon layer, wherein the active pattern contacts a surface of the substrate and wherein the second data line pattern having the same form as the first data line pattern is formed on the upper portion of the first data line pattern; a first insulating layer on the data line; a second insulating layer on the substrate; a gate electrode formed on the second insulating layer above the active pattern; a third insulating layer formed on the substrate; first and second contact holes extending through the second and third insulating layers to expose first and second portions of the active pattern, respectively; a third contact hole extending through the first, second, and third insulating layers to expose a portion of the data line; a source electrode formed on the third insulating layer, the source electrode having a first portion within the first contact hole to contact the exposed first portion of the active pattern and a second portion within the third contact hole to contact the exposed portion of the data line; and a drain electrode formed on the third insulating layer, the drain electrode having a first portion within the second contact hole to contact the exposed second portion of the active pattern and a second portion extending into a pixel region of the liquid crystal display device.