Patent ID: 6714266
Filing Date: 2004-03-30
Classification: G02F

Abstract:
A transmission type liquid crystal display device comprising on a transparent substrate a gate wiring, a signal wiring perpendicular to the gate wiring, an auxiliary capacitance wiring that is generally parallel to the gate wiring and perpendicular to the signal wiring, a thin film transistor having either one of a source region and a drain region electrically connected to the signal wiring, and a pixel electrode to which the other one of the source region and the drain region of the thin film transistor is electrically connected via a lead electrode, whereinthe signal wiring, the gate wiring, the auxiliary capacitance wiring and the lead electrode are made of light shading material(s), a semiconductor thin film is formed for a pixel electrode below and so as to be entirely covered by respective parts of the signal wiring, the gate wiring, the auxiliary capacitance wiring and the lead electrode, a region of the semiconductor thin film located below and entirely covered by the signal wiring and below and at least partially covered by the gate wiring serves as a channel region of the thin film transistor, regions of the semiconductor thin film located on both sides of the channel region below the signal wiring serve as a source region and a drain region of the thin film transistor respectively, and a region of the semiconductor thin film located below the auxiliary capacitance wiring serves as an auxiliary capacitance electrode region; and a first contact hole for electrically connecting either one of the source region and the drain region of the semiconductor thin film to the signal wiring, a second contact hole for electrically connecting the other one of the source region and drain region of the semiconductor thin film to the lead electrode, and a third contact hole for electrically connecting the lead electrode to the pixel electrode.