Array substrate used for a display device and a method of making the same
First Claim
1. An array substrate for a display device comprising:
- a substrate;
a first electrically conductive film formed over said substrate;
a first insulation film formed on said first electrically conductive film, said first insulation film having a first contact hole on a place corresponding to said first electrically conductive film;
a second electrically conductive film;
a second insulation film having a second contact hole, said second contact hole being covered with said second electrically conductive film to define an aperture; and
a third electrically conductive film formed on said first insulation film and connected to said first electrically conductive film, wherein an upper end portion of said first contact hole of said first insulation film is substantially the same in diameter as said aperture defined in said second contact hole covered with said second electrically conductive film.
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Accused Products
Abstract
A TFT array substrate used for a display device and a method of making the same are disclosed. A optically transparent thick resin insulation film 5 is formed on a base substrate and an upper contact hole 51 is perforated through the optically transparent thick resin insulation film 5. A lower contact hole 41 perforated through a gate insulation film 15 and patterning of an ITO film to make a transparent pixel electrode are then collectively carried out under a photoresist pattern 8. Where the photoresist pattern 8 is provided after making the ITO film, an aperture 81 is perforated closer to the center of the upper contact hole 51 at an end portion of a connecting line 14a for a pad and is smaller in diameter by a side etching size plus a margin than the upper contact hole. Subsequently, following three-etching steps are carried out: (1) patterning of the ITO film along the photoresist pattern 8, (2) the lower contact hole 41 is made by using buffered hydrofluoric acid solution, and (3) an “eaves” portion 6a of the ITO films is removed.
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Citations
16 Claims
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1. An array substrate for a display device comprising:
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a substrate;
a first electrically conductive film formed over said substrate;
a first insulation film formed on said first electrically conductive film, said first insulation film having a first contact hole on a place corresponding to said first electrically conductive film;
a second electrically conductive film;
a second insulation film having a second contact hole, said second contact hole being covered with said second electrically conductive film to define an aperture; and
a third electrically conductive film formed on said first insulation film and connected to said first electrically conductive film, wherein an upper end portion of said first contact hole of said first insulation film is substantially the same in diameter as said aperture defined in said second contact hole covered with said second electrically conductive film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of making an array substrate for a display device, comprising the steps of:
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making a first electrically conductive film on an insulation substrate;
forming a first insulation film to cover said first electrically conductive pattern;
forming a second insulation film on said first insulation film with a contact hole at a place corresponding to said first electrically conductive film;
making second electrically conductive film on said second insulation film;
first patterning of said second electrically conductive film by using a pattern photomask with an aperture made smaller in diameter than said contact hole;
second patterning to expose said first electrically conductive film wherein etching of said first insulation film is carried out by using said photomask and through said aperture of said second electrically conductive film to make a contact hole larger in diameter than said aperture of said second electrically conductive film;
third patterning of said second electrically conductive film by using said contact hole of said first insulation film; and
removing said pattern photomask and forming third electrically conductive film connected to said first electrically conductive film through said contact holes of said first and second insulation films. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification