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US5719408A Expired / Lapsed US ⏱️ 0.0 years remaining

Thin film transistor substrate, manufacturing method thereof, liquid crystal display panel and liquid crystal display equipment

Assignee: Hitachi Ltd
•
Filing: 1997-02-21
•
Granted: 1998-02-17
•
Expires: 2017-02-21
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Abstract

Abstract In the present invention, Cr or Ta is used for gate terminals, aluminum or a metal mainly composed of aluminum is used for gate bus-lines extended therefrom, gate electrodes and thin film capacitances (additional capacitance, storage capacitance) and an anodic oxidized film composed of the metal and free from defect is used for at least one of gate insulators, dielectric films of the thin film capacitances and interlayer insulation films for the intersections between the bus-lines. In a more preferred structure, the anodic oxidized film is used for all of the gate insulators, the dielectric films for the thin film capacitances and the interlayer insulation films for the intersections between the bus lines. The present invention also relates to a method of selectively forming an anodic oxidized film on an aluminum pattern. That is, in a case of forming a selective oxidation mask to a desired region on the aluminum pattern with a positive type photoresist, in the present invention, an angle ( theta ) formed between the selective oxidation mask and the aluminum pattern is made as: theta >/=110-20T (T: film thickness of the positive type photoresist).

Inventors

  • 👤 Hideaki Yamamoto
  • 👤 Haruo Matsumaru
  • 👤 Yasuo Tanaka
  • 👤 Ken Tsutsui
  • 👤 Toshihisa Tsukada
  • 👤 Kazuo Shirahashi
  • 👤 Akira Sasano
  • 👤 Yuka Matsukawa

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 13:19
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/136286; G02F1/1333; G02F1/1345; G02F1/136213; H; H10; H10D; H10D30/00; H10D30/60; H10D30/67; H10D30/6729; H10D30/6737; H10D30/6739

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 140 words
A thin film transistor substrate at least having a plurality of gate terminals disposed on an insulative substrate, a plurality of gate bus-lines electrically connected therewith, a plurality of signal bus-lines disposed in intersection with said plurality of gate bus-lines, and a plurality of thin film transistors arranged in a matrix-like form, wherein said gate bus-lines and a plurality of gate electrodes of said thin film transistors are made of one of aluminum and a metal mainly composed of aluminum, a portion at the surface of the gate bus-lines is covered with an anodic oxide film, formed by anodically oxidizing said aluminum or said metal mainly composed of aluminum, and a connection portion of each of said gate bus-lines with a corresponding gate terminal is a stripe-pattern formed by a plurality of slits and not covered with said oxide film.
Claim 2
Dependent Claim 140 words
A thin film transistor substrate at least having a plurality of gate terminals disposed on an insulative substrate, a plurality of gate bus-lines electrically connected therewith, a plurality of signal bus-lines disposed in intersection with said plurality of gate bus-lines, and a plurality of thin film transistors arranged in a matrix-like form, wherein said gate bus-lines and a plurality of gate electrodes of said thin film transistors are made of one of aluminum and a metal mainly composed of aluminum, a portion at the surface of the gate bus-lines is covered with an anodic oxide film, formed by anodically oxidizing said aluminum or said metal mainly composed of aluminum, and a connection portion of each of said gate bus-lines with a corresponding gate terminal is a stripe-pattern formed by a plurality of slits and not covered with said oxide film.
Claim 3
Dependent Claim 38 words
A thin film transistor substrate as defined in claim 1, wherein said connection portion of each of said gate bus-lines with the corresponding gate terminal is a stripe-pattern with a line width of not greater than 20 μm.
Claim 4
Dependent Claim 20 words
A thin film transistor substrate as defined in claim 2, wherein said line width is not greater than 10 μm.
Claim 5
Dependent Claim 45 words
A thin film transistor substrate as defined in claim 1, wherein said gate bus-lines and said plurality of gate electrodes of said thin film transistors are constituted by a gate bus-line pattern made of said one of aluminum and a metal mainly composed of aluminum.
Claim 6
Dependent Claim 40 words
A thin film transistor substrate as defined in claim 4, further comprising a plurality of thin film capacitances, and wherein electrodes of the thin film capacitances are made of said one of aluminum and the metal mainly composed of aluminum.
Claim 7
Dependent Claim 43 words
A thin film transistor substrate as defined in claim 5, wherein said electrodes of the thin film capacitances, in addition to the gate bus-lines and the plurality of the gate electrodes of the thin film transistors, are constituted by the gate bus-line pattern.
Claim 8
Dependent Claim 29 words
A thin film transistor substrate as defined in claim 1, wherein each of said gate terminals is made of a material different from a material of the gate electrodes.
Claim 9
Dependent Claim 30 words
A thin film transistor substrate as defined in claim 7, wherein each of said gate terminals is made of a material selected from the group consisting of chromium and tantalum.

References Cited (Backward Citations)

US4907861A Cited
US5097297A Cited
US5062690A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2001-02-16 2001-08-18 2002-02-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2005-02-16 2005-08-18 2006-02-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2009-02-16 2009-08-18 2010-02-17 $7700.00 Window Closed / Lapsed

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