Method of manufacturing thin film transistors in a liquid crystal display apparatus
First Claim
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1. A method of manufacturing thin film transistors in a liquid crystal display apparatus, comprising the steps of:
- forming a gate electrode on a transparent insulating substrate;
growing a gate insulator film, a semiconductor active layer and an insulating channel protective film one after another on a region including said gate electrode and forming a pixel electrode transparent conductive film;
forming a photoresist pattern on said channel protective film and inside a position corresponding to the contour of said gate electrode;
patterning said channel protective film and said semiconductor active layer by etching said channel protective film and said semiconductor active layer using said photoresist pattern as a mask;
forming a pattern in which the contour of said channel protective film is positioned inside of the contour of said semiconductor active layer by applying side etching selectively to said channel protective film located between said photoresist pattern and said semiconductor active layer;
forming a contact region by introducing impurities into said semiconductor active layer exposed outside from the contour of said channel protective film; and
forming a source electrode and a drain electrode connected to said contact region and separated thereon.
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Abstract
A first sheet of photomask is used when a gate electrode and a gate bus line are formed, a second sheet of photomask is used when patterning is applied to a semiconductor film which becomes an active layer of a transistor on the gate electrode, a third sheet of photomask is used when a pixel electrode, a source electrode, a drain electrode, a drain bus line and a drain bus terminal portion are formed, and a fourth sheet of photomask is used when a film on the drain bus terminal portion, the gate bus terminal portion and pixel portion is removed, thereby to form thin film transistors arranged in a matrix form.
55 Citations
12 Claims
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1. A method of manufacturing thin film transistors in a liquid crystal display apparatus, comprising the steps of:
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forming a gate electrode on a transparent insulating substrate; growing a gate insulator film, a semiconductor active layer and an insulating channel protective film one after another on a region including said gate electrode and forming a pixel electrode transparent conductive film; forming a photoresist pattern on said channel protective film and inside a position corresponding to the contour of said gate electrode; patterning said channel protective film and said semiconductor active layer by etching said channel protective film and said semiconductor active layer using said photoresist pattern as a mask; forming a pattern in which the contour of said channel protective film is positioned inside of the contour of said semiconductor active layer by applying side etching selectively to said channel protective film located between said photoresist pattern and said semiconductor active layer; forming a contact region by introducing impurities into said semiconductor active layer exposed outside from the contour of said channel protective film; and forming a source electrode and a drain electrode connected to said contact region and separated thereon. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of manufacturing thin film transistors in a liquid crystal display apparatus, comprising the steps of:
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forming gate electrodes and gate bus lines conducting with said gate electrodes on a transparent insulating substrate growing a gate insulator film, a semiconductor active layer and an insulating channel protective film one after another on a region including said gate electrodes and said gate bus lines; forming a photoresist pattern on said channel protective film and inside a position corresponding to the contour of said gate electrode; patterning said channel protective film and said semiconductor active layer remain on said gate electrodes by etching said channel protective film and said semiconductor active layer using said photoresist pattern as a mask; forming a pattern in which the contour of said channel protective film is positioned inside of the contour of said semiconductor active layer by applying side etching selectively to said channel protective film located between said photoresist pattern and said semiconductor active layer; forming a contact region by introducing impurities into said semiconductor active layer exposed outside from the contour of said channel protective film after said photoresist pattern is removed; forming a multilayer structure film composed of a pixel electrode transparent conductive film and a metal film on a region including said channel protective film, said contact region, a drain bus region and a pixel region; forming a source electrode and a drain electrode connected to said contact region and separated thereon and a drain bus line connected to said drain electrode by applying patterning to said multilayer structure film, and also remaining said multilayer structure film extending from said source electrode over to said pixel region; removing a part of said contact region by means of etching using said source electrode, said drain electrode and said channel protective film as a mask; and removing said metal film existing in said pixel region, thereby to use said exposed pixel electrode transparent conductive film as a pixel electrode. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification