METHOD FOR MANUFACTURING THIN FILM TRANSISTOR AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a liquid crystal display device with low cost and high productivity by remarkably reducing manufacturing steps and provide a liquid crystal display device with low power consumption and high reliability.

SOLUTION: Etching of a semiconductor layer including a part on gate wiring and formation of a contact hole for connecting a pixel electrode and a drain electrode are performed by the same step of photolithography step and etching step to reduce the photolithography step. A part of the gate wiring exposed by this step is covered by an insulating layer, which is made to double as spacer for maintaining an interval between liquid crystal layers. By reducing the photolithography step, it is possible to provide a liquid crystal display device with low cost and high productivity. Further, since an oxide semiconductor is used for the semiconductor layer, power consumption is reduced and the liquid crystal display device with high reliability can be provided.

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