Patent ID: 8451418

Claim:
A liquid crystal display device comprising: a TFT substrate; gate lines extending in a first direction and arranged in a second direction over the TFT substrate; drain lines extending in the second direction and arranged in the first direction over the TFT substrate; pixel electrodes each formed in a region surrounded by the gate lines and drain lines; trapezoidal protrusions formed discretely in the first direction below the gate lines, each of the trapezoidal protrusions having an upper surface and inclined surfaces in the cross section taken along a plane orthogonal to the first direction; a gate insulating film formed over the gate lines; a semiconductor layer formed on the gate insulating film; drain electrodes formed by the drain lines over the semiconductor layer; source electrodes formed over the semiconductor layer; and channel portions defined by the space between the drain electrodes and the source electrodes, each of the channel portions being formed covering the upper surface and the inclined surfaces of the trapezoidal protrusion; wherein the pixel electrode and the source electrode are in contact with each other on the inclined surface of the trapezoidal protrusion.