Liquid crystal display device and fabrication method thereof

A method for fabricating a liquid crystal display device, comprising:

• providing a first substrate divided into a pixel part, including first and second regions, and a driving circuit part;
• forming a gate electrode in the first region of the pixel part;
• forming a first insulation film, an amorphous silicon thin film and an n+ amorphous silicon thin film on the first substrate;
• activating the second region of the pixel part and the n+ amorphous silicon thin film of the driving circuit part;
• forming a first conductive film on the first substrate and selectively patterning the first conductive film, the n+ amorphous silicon thin film and the amorphous silicon thin film to form active patterns in the pixel part and in the driving circuit part with source and drain electrodes at upper portions thereof;
• crystallizing the amorphous silicon thin films constituting the active pattern of the driving circuit part and the active pattern of the second region of the pixel part;
• forming a second insulation film on the first substrate;
• forming a pixel electrode at the first region of the pixel part, a first gate electrode at the second region of the pixel part and a second gate electrode at the driving circuit part of the first substrate;
• and
• attaching the first and second substrates.

A liquid crystal display device comprising:

• a first substrate divided into a pixel part and a driving circuit part;
• an amorphous silicon thin film transistor formed on the pixel part of the first substrate having a gate electrode, an active pattern, source and drain electrodes and a pixel electrode;
• a polycrystalline silicon thin film transistor formed in the driving circuit part of the first substrate and having an active pattern, source and drain electrodes and a gate electrode formed on the same layers respectively corresponding to the active pattern, the source and drain electrodes and the pixel electrode of the amorphous silicon thin film transistor;
• and
• a second substrate, a color filter substrate, attached to the first substrate in a facing manner.

A liquid crystal display device comprising:

• an amorphous silicon thin film transistor formed on a first region of a first substrate and comprised of a gate electrode, an active pattern, source and drain electrodes and a pixel electrode;
• a polycrystalline silicon thin film transistor formed on a second region of the first substrate and comprised of an active pattern, source and drain electrodes and a gate electrode formed on the same layer respectively corresponding to the active pattern, the source and drain electrodes and the pixel electrode of the first region;
• and
• a second substrate, a color filter substrate, attached to the first substrate in a facing manner.