JPH02278749A - Image display device and its manufacture - Google Patents

Image display device and its manufacture

Info

Publication number
JPH02278749A
JPH02278749A JP1098721A JP9872189A JPH02278749A JP H02278749 A JPH02278749 A JP H02278749A JP 1098721 A JP1098721 A JP 1098721A JP 9872189 A JP9872189 A JP 9872189A JP H02278749 A JPH02278749 A JP H02278749A
Authority
JP
Japan
Prior art keywords
etching
polycrystalline silicon
contact
hole
pixel electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1098721A
Other languages
Japanese (ja)
Inventor
Akira Nakamura
晃 中村
Koji Senda
耕司 千田
Eiji Fujii
英治 藤井
Fumiaki Emoto
文昭 江本
Atsuya Yamamoto
敦也 山本
Yasuhiro Uemoto
康裕 上本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Priority to JP1098721A priority Critical patent/JPH02278749A/en
Publication of JPH02278749A publication Critical patent/JPH02278749A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To simplify a process by utilizing side etching of an insulation layer at the upper layer when forming a hole reaching a polycrystal silicon by etching. CONSTITUTION:A polycrystal silicon 2, NSG(Nondoped Silicon Glass) 3, and Pl-SiNx4 are accumulated on a crystal substrate 1 in sequence and a part for forming contact is subjected to patterning by a resist 7. Then, etching is performed by using 7% hydrofluoric acid solution. Etching rate of Pl-SiNx is faster than that of NSG so that Pl-SiNx is side-etched to a great extent when etching is performed. Thus, the side wall of a contact hole becomes slanted. By eliminating the resist 7, accumulating an ITO 5, and performing heat treatment, an ohmic contact is formed directly between the ITO5 and the polycrystal silicon 2 and then finally Pl-SiNx 6 of passivation is accumulated. In this manner, production process can be simplified by allowing direct contact between the ITO and polycrystal silicon.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、ワープロ、テレビジ3ン、各種コンピュータ
のデイスプレィとして用いることができる画像表示装置
およびその製造方法に関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image display device that can be used as a display for word processors, televisions, and various computers, and a method for manufacturing the same.

(従来の技術) 従来の画素電極層とスイッチング用の薄膜トランジスタ
を形成する多結晶シリコンとのコンタクI−の構造を説
明する。第3図に従来のコンタクト部の構造を示す。同
図において、11は石英基板。
(Prior Art) The structure of a conventional contact I- between a pixel electrode layer and polycrystalline silicon forming a switching thin film transistor will be described. FIG. 3 shows the structure of a conventional contact section. In the figure, 11 is a quartz substrate.

12は多結晶シリコンである。スイッチング用の薄膜1
〜ランジスタは、多結晶シリコン12を用いて形成され
る。また、コンタクト部の多結晶シリコンは、ドーピン
グによりN型あるいはP型になっている。13はN S
 G (Nondoped−3iLicon−G]、a
ss)で、層間絶縁用である。14はpH−5iNx(
1)で、ITOエツチングのときにAQ配線を保護する
役割をする。
12 is polycrystalline silicon. Thin film for switching 1
~The transistor is formed using polycrystalline silicon 12. Furthermore, the polycrystalline silicon in the contact portion is doped to be N-type or P-type. 13 is N S
G (Nondoped-3iLicon-G), a
ss) for interlayer insulation. 14 is pH-5iNx (
In 1), it serves to protect the AQ wiring during ITO etching.

15はAt)、 16はCr、17は画素電極のITO
であり、18はパッシベーションのρQ−3iN、 (
2)である。
15 is At), 16 is Cr, and 17 is ITO of the pixel electrode.
and 18 is the passivation ρQ-3iN, (
2).

(発明が解決しようとする課題) 上記従来のコンタクト部の構造では、透明画素電極のI
TOと多結晶シリコンは直接コンタクトしておらず、間
にAQとCrが介在しており、コンタクト形成に必要な
工程数が多くなり、画像表示装置の製造において歩留り
を低下させ、原価も割高になる欠点があった。
(Problems to be Solved by the Invention) In the above conventional structure of the contact portion, the I of the transparent pixel electrode is
TO and polycrystalline silicon are not in direct contact, with AQ and Cr interposed between them, which increases the number of steps required to form the contact, lowers the yield in the production of image display devices, and increases the cost. There was a drawback.

本発明の目的は、従来の欠点を解消し、簡易な構造で、
しかも製造工程数も少なくてすむ画像表示装置を提供す
ることである。
The purpose of the present invention is to eliminate the conventional drawbacks, have a simple structure,
Moreover, it is an object of the present invention to provide an image display device that requires fewer manufacturing steps.

(課題を解決するための手段) 本発明の画像表示装置は1石英基板上に堆積された多結
晶シリコンと画素電極層との間には穴のあいている種類
の異なる二層の絶縁層があり、穴の領域で多結晶シリコ
ンと画素電極層とは直接接触しており、穴は上層に行く
にしたがって急激に大きくなっているものである。
(Means for Solving the Problems) The image display device of the present invention has two insulating layers of different types with holes between the polycrystalline silicon deposited on a quartz substrate and the pixel electrode layer. The polycrystalline silicon and the pixel electrode layer are in direct contact with each other in the hole region, and the hole becomes rapidly larger toward the upper layer.

またその製造方法は1石英基板上の多結晶シリコン上に
堆積した二層の絶縁層にエツチングによって多結晶シリ
コンに達する穴を形成するとき。
The manufacturing method involves forming a hole reaching the polycrystalline silicon by etching two insulating layers deposited on polycrystalline silicon on a quartz substrate.

上層の絶縁層のサイドエツチングを利用して穴の側壁が
なだらかな傾斜状となり、その上に画素電極層を堆積す
る工程を含むものである。
This method includes the step of forming the sidewall of the hole into a gentle slope by side-etching the upper insulating layer, and depositing the pixel electrode layer thereon.

(作 用) 本発明の構造およびコンタクト穴の形成方法により、C
r層を形成するプロセスをなくすることができ、従来に
比ベプロセス工程を簡単化でき、多結晶シリコンとIT
Oのコンタクトを確実に形成でき、その結果として、装
置の製造歩留りを向上することができ、さらに原価を低
減することができる。
(Function) With the structure and contact hole forming method of the present invention, C
It is possible to eliminate the process of forming the r layer, simplifying the process compared to the conventional method, and
O contacts can be reliably formed, and as a result, the manufacturing yield of the device can be improved and the cost can be further reduced.

(実施例) 本発明の一実施例を第1図および第2図に基づいて説明
する。
(Example) An example of the present invention will be described based on FIGS. 1 and 2.

第1図は、本発明の画素電極層と薄膜トランジスタ形成
層のコンタクト部の構造図である。同図において、1は
石英基板、2は多結晶シリコンである。スイッチング用
の薄膜トランジスタは、多結晶シリコン2を用いて形成
される。また、コンタクト部の多結晶シリコンは、ドー
ピングによりN型あるいはP型になっている。3はNS
Gで、眉間絶縁用である。4はpH−5iNx (1)
、5は画素電極のITOであり、6はパッシベーション
のρa−5iNx(2)である1以上のように、多結晶
シリコン2とITO5は直接コンタクトしている。
FIG. 1 is a structural diagram of a contact portion between a pixel electrode layer and a thin film transistor forming layer according to the present invention. In the figure, 1 is a quartz substrate, and 2 is polycrystalline silicon. A thin film transistor for switching is formed using polycrystalline silicon 2. Furthermore, the polycrystalline silicon in the contact portion is doped to be N-type or P-type. 3 is NS
G is for insulation between the eyebrows. 4 is pH-5iNx (1)
, 5 is ITO of the pixel electrode, and 6 is ρa-5iNx (2) for passivation.As shown in 1 and above, the polycrystalline silicon 2 and ITO 5 are in direct contact.

次に、コンタクトの製造方法を第2図に基づいて説明す
る。まず、第2図(a)に示すように1石英基板1上に
多結晶シリコン2.N5G3.pH−5iNx4を順に
堆積し、レジスト7によりコンタクトを形成する部分を
バターニングする0次に、7%弗酸水溶液を用いてエツ
チングを行う。7%弗酸水溶液に対するエツチングレー
トは、NSGに比べpQ−3iNxは速い。そのため、
エツチングを行うとpQ−5iN、ばかなりサイドエツ
チングされる。
Next, a method for manufacturing a contact will be explained based on FIG. 2. First, as shown in FIG. 2(a), two polycrystalline silicon substrates are placed on a quartz substrate 1. N5G3. pH-5iNx4 is sequentially deposited, and the portion where the contact is to be formed is patterned using resist 7. Next, etching is performed using a 7% hydrofluoric acid aqueous solution. The etching rate for a 7% hydrofluoric acid aqueous solution is faster for pQ-3iNx than for NSG. Therefore,
When etching is performed, only a portion of pQ-5iN is side-etched.

その結果、コンタクトの穴が多結晶シリコン2に達した
ときには、第2@(b)に示すようになる。
As a result, when the contact hole reaches the polycrystalline silicon 2, it becomes as shown in the second @(b).

すなわち、コンタクトの穴はステップ状に形成されるの
ではなく、コンタクトの穴の側壁はなだらかな傾斜状に
なる。このように、コンタクトの穴を形成したあと、レ
ジスト7を除去し、ITOを堆積し、125℃で30分
間熱処理を施すことにより、ITOと多結晶シリコンと
の間に直接オーミックコンタクトを形成し、最後にパッ
シベーションのp<!−3iNxを堆積し、第1図に示
したコンタクト部の構造を完成させる。
That is, the contact hole is not formed in a step shape, but the side wall of the contact hole has a gently sloped shape. After forming the contact hole in this way, the resist 7 is removed, ITO is deposited, and heat treatment is performed at 125° C. for 30 minutes to form a direct ohmic contact between the ITO and polycrystalline silicon. Finally, passivation p<! -3iNx is deposited to complete the structure of the contact portion shown in FIG.

本発明の構造を用いて画像表示装置を作製したところ、
従来と変わりない特性を示した。
When an image display device was manufactured using the structure of the present invention,
It showed the same characteristics as before.

なお1本実施例では、コンタクト穴を形成するエツチン
グ液として7%弗酸水溶液を用いたが。
In this example, a 7% hydrofluoric acid aqueous solution was used as the etching solution for forming the contact holes.

NSGよりもpH−3iNxの方がエツチングレートの
速いエツチング液ならばよい。
pH-3iNx may be used as an etching solution as long as it has a faster etching rate than NSG.

以上のように1本実施例によれば、ITOと多結晶シリ
コンとを直接コンタクトしても、従来と同じ特性の0画
像特性が得られることから、製造工程の減った分だけ歩
留りが上がり、原価を低減することができる。
As described above, according to this embodiment, even if ITO and polycrystalline silicon are directly contacted, the same 0 image characteristics as conventional ones can be obtained, so the yield is increased by the reduction in manufacturing steps. Costs can be reduced.

(発明の効果) 本発明によれば、コンタクト穴の形成を工夫することに
より、ITOと多結晶シリコンを直接コンタクトするこ
とにより、製造工程を簡単化でき、歩留りも高くなり、
原価を大幅に低減することができ、その実用上の効果は
大である。
(Effects of the Invention) According to the present invention, by devising the formation of contact holes and directly contacting ITO and polycrystalline silicon, the manufacturing process can be simplified and the yield can be increased.
The cost can be reduced significantly, and the practical effect is great.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例における画像表示装置のIT
Oと多結晶シリコンのコンタクト部の構成図、第2図は
同コンタクト部の製造方法を示す工程図、第3図は従来
の画像表示装置のコンタクト部の構成図である。 1・・・石英基板、  2・・・多結晶シリコン。 3−N S G、 4−・p+!−5iNx(1)、 
 5 ・ITo、 6−pQ−siNx(2)。 特許出願人 松下電子工業株式会社 第 図 (a) (b)
FIG. 1 shows the IT of an image display device in one embodiment of the present invention.
FIG. 2 is a process diagram showing a method of manufacturing the contact portion, and FIG. 3 is a diagram showing the configuration of a contact portion of a conventional image display device. 1...Quartz substrate, 2...Polycrystalline silicon. 3-N S G, 4-・p+! -5iNx(1),
5.ITo, 6-pQ-siNx (2). Patent applicant: Matsushita Electronics Co., Ltd. Figures (a) (b)

Claims (2)

【特許請求の範囲】[Claims] (1)石英基板上に堆積された多結晶シリコンと画素電
極層との間には穴のあいている種類の異なる二層の絶縁
層があり、前記穴の領域で多結晶シリコンと画素電極層
とは直接接触しており、前記穴は上層に行くにしたがっ
て急激に大きくなっていることを特徴とする画像表示装
置。
(1) There are two insulating layers of different types with holes between the polycrystalline silicon deposited on the quartz substrate and the pixel electrode layer, and in the area of the holes, the polycrystalline silicon and the pixel electrode layer The image display device is characterized in that the hole is in direct contact with the hole and the hole becomes rapidly larger toward the upper layer.
(2)石英基板上の多結晶シリコン上に堆積した二層の
絶縁層にエッチングによって多結晶シリコンに達する穴
を形成するとき、上層の絶縁層のサイドエッチングを利
用して穴の側壁がなだらかな傾斜状となり、その上に画
素電極層を堆積する工程を含むことを特徴とする画像表
示装置の製造方法。
(2) When forming a hole that reaches the polycrystalline silicon by etching in a two-layer insulating layer deposited on polycrystalline silicon on a quartz substrate, side etching of the upper insulating layer is used to create a smooth side wall of the hole. 1. A method of manufacturing an image display device, the method comprising the step of depositing a pixel electrode layer on the sloped pixel electrode layer.
JP1098721A 1989-04-20 1989-04-20 Image display device and its manufacture Pending JPH02278749A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1098721A JPH02278749A (en) 1989-04-20 1989-04-20 Image display device and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1098721A JPH02278749A (en) 1989-04-20 1989-04-20 Image display device and its manufacture

Publications (1)

Publication Number Publication Date
JPH02278749A true JPH02278749A (en) 1990-11-15

Family

ID=14227386

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1098721A Pending JPH02278749A (en) 1989-04-20 1989-04-20 Image display device and its manufacture

Country Status (1)

Country Link
JP (1) JPH02278749A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5956105A (en) * 1991-06-14 1999-09-21 Semiconductor Energy Laboratory Co., Ltd. Electro-optical device and method of driving the same
US7479939B1 (en) 1991-02-16 2009-01-20 Semiconductor Energy Laboratory Co., Ltd. Electro-optical device
US7727898B2 (en) 1995-11-27 2010-06-01 Semiconductor Energy Laboratory Co., Ltd Semiconductor device and method of fabricating same
US7786553B1 (en) 1995-11-27 2010-08-31 Semiconductor Energy Laboratory Co., Ltd. Method of fabricating semiconductor device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55154750A (en) * 1979-05-22 1980-12-02 Fujitsu Ltd Manufacture of semiconductor device
JPS59205738A (en) * 1983-05-10 1984-11-21 Seiko Epson Corp Active matrix board

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55154750A (en) * 1979-05-22 1980-12-02 Fujitsu Ltd Manufacture of semiconductor device
JPS59205738A (en) * 1983-05-10 1984-11-21 Seiko Epson Corp Active matrix board

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7479939B1 (en) 1991-02-16 2009-01-20 Semiconductor Energy Laboratory Co., Ltd. Electro-optical device
US5956105A (en) * 1991-06-14 1999-09-21 Semiconductor Energy Laboratory Co., Ltd. Electro-optical device and method of driving the same
US7727898B2 (en) 1995-11-27 2010-06-01 Semiconductor Energy Laboratory Co., Ltd Semiconductor device and method of fabricating same
US7786553B1 (en) 1995-11-27 2010-08-31 Semiconductor Energy Laboratory Co., Ltd. Method of fabricating semiconductor device
US7800235B2 (en) 1995-11-27 2010-09-21 Semiconductor Energy Laboratory Co., Ltd. Method of fabricating semiconductor device

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