Importance

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Abstract

A liquid crystal display (LCD) device includes: a plurality of gate lines and a plurality of data lines arranged in the form of a matrix; a plurality of transistors each having a gate, a source and a drain, and each disposed at an intersecting point of the lines; a plurality of pixel electrodes connected to the drain electrodes of the respective transistors; and a plurality of capacitors formed on the pixel electrodes. The capacitor includes a capacitor electrode, a gate insulating layer, a semiconductor layer and a protective insulating layer. The semiconductor layer of the capacitor is composed of the same material as that of a semiconductor region of the transistor. An etch stop layer is used for protecting a gate insulating layer during etching a protective insulating layer situated above the gate insulating layer. For the etch stop layer, an amorphous silicon layer or a metal layer are used. By virtue of using the etch stop layer, the capacitor electrodes can be spaced closer together than in conventional LCD devices, thereby advantageously resulting in increased storage capacitance and improved displayed image quality.

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First Claim