JPH0792497A - Liquid crystal display device and its production - Google Patents
Liquid crystal display device and its productionInfo
- Publication number
- JPH0792497A JPH0792497A JP25925593A JP25925593A JPH0792497A JP H0792497 A JPH0792497 A JP H0792497A JP 25925593 A JP25925593 A JP 25925593A JP 25925593 A JP25925593 A JP 25925593A JP H0792497 A JPH0792497 A JP H0792497A
- Authority
- JP
- Japan
- Prior art keywords
- film
- films
- electrode
- liquid crystal
- extraction 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13458—Terminal pads
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶表示装置の引出し
電極の構造に特徴を有する液晶表示装置、及びその製造
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device characterized by the structure of extraction electrodes of a liquid crystal display device, and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】薄膜トランジスタ（ＴＦＴ）と画素電極
をアレイ状に配設し、液晶をドットマトリックス状に駆
動する従来の液晶表示装置について説明する。図５は液
晶表示装置の実装電極部の構成を示す平面図であり、引
き出電極１ａはＴＦＴのゲート電極１に接続されたＴＡ
Ｂフィルム接続用の電極である。2. Description of the Related Art A conventional liquid crystal display device in which thin film transistors (TFTs) and pixel electrodes are arranged in an array and liquid crystal is driven in a dot matrix will be described. FIG. 5 is a plan view showing the configuration of the mounting electrode portion of the liquid crystal display device, and the extraction electrode 1a is a TA connected to the gate electrode 1 of the TFT.
It is an electrode for B film connection.
【０００３】このような引出し電極１ａとＴＦＴを含む
液晶表示装置の製造方法について説明する。図６は引出
し電極１ａの製造方法を示す工程図である。A method of manufacturing such a liquid crystal display device including the extraction electrode 1a and the TFT will be described. FIG. 6 is a process diagram showing a method for manufacturing the extraction electrode 1a.
【０００４】図６（ａ）に示すように、先ず第１の工程
として絶縁性透明基板としてのガラス基板２上の全面
に、例えばＳｉＯ2 又はＴａＯｘ（ｘは整数）のアンダ
ーコート膜３を形成する。次に第２の工程として、引出
し電極１ａとなる位置に第１の金属膜としてＡｌ膜或は
Ａｌ合金膜をパターン形成する。As shown in FIG. 6A, in the first step, an undercoat film 3 of, for example, SiO 2 or TaOx (x is an integer) is formed on the entire surface of a glass substrate 2 as an insulating transparent substrate. To do. Next, as a second step, an Al film or an Al alloy film is patterned as a first metal film at a position to be the extraction electrode 1a.
【０００５】第３の工程として例えばＳｉＮｘ（ｘは整
数）のゲート絶縁膜４を全面形成する。そして第４の工
程として図示しない部分にＴＦＴを形成する。即ちシリ
コン半導体層及びチャネル保護用の層間絶縁膜を成膜
し、ゲート電極上のチャネル保護膜をパターニングす
る。次に第５の工程としてｎ+ シリコン膜を形成したの
ち、ｎ+ シリコン膜及びシリコン半導体層をパターニン
グする。第６の工程として、画素電極として例えばＩＴ
Ｏの透明導電膜を成膜し、パターン形成する。そして第
７の工程として、ソース・ドレイン電極となる第２の金
属膜をパターン形成する。As a third step, a gate insulating film 4 of, for example, SiNx (x is an integer) is formed on the entire surface. Then, as a fourth step, a TFT is formed in a portion not shown. That is, a silicon semiconductor layer and an interlayer insulating film for channel protection are formed, and the channel protection film on the gate electrode is patterned. Then after forming an n + silicon film as the fifth step, patterning the n + silicon film and a silicon semiconductor layer. In the sixth step, for example, IT is used as a pixel electrode.
A transparent conductive film of O is formed and patterned. Then, as a seventh step, a second metal film to be the source / drain electrodes is patterned.
【０００６】次に第８の工程として図６（ｂ）に示すよ
うに、絶縁保護膜５としてＳｉＮｘを成膜する。こうす
ると引出し電極１ａ上にはゲート絶縁膜４及び絶縁保護
膜５として２層のＳｉＮｘ膜が形成される。尚、ＴＦＴ
のソース側の引出し電極にも同様の絶縁保護膜５が形成
される。Next, as an eighth step, as shown in FIG. 6B, SiNx is formed as an insulating protective film 5. Thus, a two-layer SiNx film is formed as the gate insulating film 4 and the insulating protective film 5 on the extraction electrode 1a. In addition, TFT
A similar insulating protection film 5 is formed on the extraction electrode on the source side.
【０００７】最後に第９の工程として、絶縁保護膜５上
にレジスト６を塗布し、パターン形成を行う。このとき
図６（ｃ）に示すようにレジスト６で保護された以外の
部分のゲート絶縁膜４及び絶縁保護膜５はＳＦ6 ガスの
ドライエッチングにより除去される。こうすれば引出し
電極１ａが露出する。Finally, as a ninth step, a resist 6 is applied on the insulating protective film 5 to form a pattern. At this time, as shown in FIG. 6C, the gate insulating film 4 and the insulating protective film 5 other than those protected by the resist 6 are removed by dry etching with SF 6 gas. In this way, the extraction electrode 1a is exposed.
【０００８】[0008]
【発明が解決しようとする課題】さて第９の工程のパタ
ーン形成において実装電極を形成するには、第１の方法
として複数の引出し電極１ａを一括にまとめ、広範囲で
ゲート絶縁膜４，絶縁保護膜５を開口する方法がある。
又第２の方法として個々の引出し電極１ａについてゲー
ト絶縁膜４，絶縁保護膜５を部分的に開口する方法があ
る。In order to form the mounting electrodes in the pattern formation in the ninth step, as a first method, a plurality of extraction electrodes 1a are put together, and the gate insulating film 4 and the insulation protection are spread over a wide area. There is a method of opening the membrane 5.
As a second method, there is a method of partially opening the gate insulating film 4 and the insulating protective film 5 for each extraction electrode 1a.
【０００９】第１の方法は簡易的マスク合わせで行え、
引出し電極１ａ周囲のＳｉＮｘ膜の殆どがエッチングで
除去されるため、加工後の引出し電極１ａの断面構造は
凸状となる。図５の破線部は絶縁保護膜（ＢＰ）５の開
口部７を示している。開口部７の引出し電極１ａにＴＡ
Ｂフィルム８が例えば熱圧着により接続される。こうし
て製造された液晶表示装置を高温高湿下による信頼性試
験（湿中試験）を行うと、露出した引出し電極１ａの矢
印Ａ，Ｂに示す部分にＡｌの消失がみられる。図６
（ｄ）は湿中試験した引出し電極１ａの断面図である。
本図のＣで示す部分は、引出し電極１ａのＡｌが相当量
消失している。The first method is simple mask alignment,
Since most of the SiNx film around the extraction electrode 1a is removed by etching, the sectional structure of the extraction electrode 1a after processing becomes convex. The broken line portion in FIG. 5 indicates the opening 7 of the insulating protective film (BP) 5. TA on the extraction electrode 1a of the opening 7
The B film 8 is connected by, for example, thermocompression bonding. When the liquid crystal display device manufactured in this manner is subjected to a reliability test under high temperature and high humidity (in-wet test), disappearance of Al is observed in the exposed portions of the extraction electrode 1a shown by arrows A and B. Figure 6
(D) is a cross-sectional view of the extraction electrode 1a tested in the humidity.
In the portion indicated by C in the figure, a considerable amount of Al of the extraction electrode 1a has disappeared.
【００１０】これに対し図７は、第２の方法で形成した
引出し電極１ａを湿中試験した結果を示す平面図であ
る。この方法では引出し電極１ａ上のＳｉＮｘに窓明け
を行い、開口部９を形成する。従って引出し電極１ａの
断面構造は凹状となる。この開口部９を介してＴＡＢフ
ィルム８を接続する。この場合は引出し電極１ａの周囲
が絶縁保護膜５で覆われるため、微細なマスク合わせを
しなければならないという欠点がある。しかしこの引出
し電極１ａを湿中試験をした結果、Ａｌの消失がＡｌの
露出部分で治まり、絶縁保護膜５下のＡｌは残存するこ
とが判った。このため引出電極１の完全断線は生じなく
なる。On the other hand, FIG. 7 is a plan view showing the results of a wet test of the extraction electrode 1a formed by the second method. In this method, SiNx on the extraction electrode 1a is opened to form an opening 9. Therefore, the cross-sectional structure of the extraction electrode 1a has a concave shape. The TAB film 8 is connected through this opening 9. In this case, since the periphery of the extraction electrode 1a is covered with the insulating protective film 5, there is a disadvantage that fine mask alignment must be performed. However, as a result of performing a wet test on the extraction electrode 1a, it was found that the disappearance of Al was stopped at the exposed portion of Al and the Al under the insulating protective film 5 remained. Therefore, complete disconnection of the extraction electrode 1 does not occur.
【００１１】本発明はこのような従来の問題点に鑑みて
なされたものであって、引出し電極を高温高湿の環境下
に放置しても、ＴＡＢフィルムとの接合部分の金属膜の
消失を生じさせず、且つ引出し電極部のマスク合わせを
簡易化すると共に、実装電極の信頼性を向上した液晶表
示装置を提供することを第１の目的とし、更にその液晶
表示装置の製造方法を実現することを第２の目的とす
る。The present invention has been made in view of such conventional problems. Even if the extraction electrode is left in an environment of high temperature and high humidity, the metal film at the joint portion with the TAB film disappears. A first object of the present invention is to provide a liquid crystal display device which does not cause the occurrence of defects, simplifies the mask alignment of the extraction electrode portion, and improves the reliability of the mounting electrodes, and further realizes a method of manufacturing the liquid crystal display device. This is the second purpose.
【００１２】[0012]
【課題を解決するための手段】本願の請求項１の発明
は、絶縁性透明基板上にアレイ状に配列され、ソース及
びドレイン電極を有する薄膜トランジスタと、薄膜トラ
ンジスタによって駆動される液晶セルと、薄膜トランジ
スタの駆動信号を入力するゲート電極と、外部回路と接
続されて薄膜トランジスタのゲート電極に駆動信号を与
え、Ａｌ又はＡｌ合金で成膜された引出し電極と、を有
する液晶表示装置であって、薄膜トランジスタのゲート
絶縁膜を介してソース及びドレイン電極を構成する耐水
性の金属膜を引出し電極の外周部に設けたことを特徴と
するものである。According to a first aspect of the present invention, there are provided a thin film transistor arranged in an array on an insulating transparent substrate and having source and drain electrodes, a liquid crystal cell driven by the thin film transistor, and a thin film transistor. A liquid crystal display device comprising: a gate electrode for inputting a drive signal; and a lead-out electrode which is connected to an external circuit to apply a drive signal to the gate electrode of a thin film transistor and which is formed of Al or an Al alloy. The present invention is characterized in that a water-resistant metal film forming a source electrode and a drain electrode is provided on the outer peripheral portion of the extraction electrode via an insulating film.
【００１３】本願の請求項３の発明は、絶縁性透明基板
上にＳｉＯ2 又はＴａＯｘ（ｘは整数）のアンダーコー
ト膜を形成する工程と、アンダーコート膜の上面に、一
部がゲート電極及び引出し電極になる第１の金属膜を成
膜してパターニングを行う工程と、第１の金属膜がパタ
ーニングされた基板上面にＳｉＮｘ（ｘは整数）のゲー
ト絶縁膜を形成する工程と、シリコン半導体層及びチャ
ンネル保護層を成膜してパターニングを行う工程と、画
素電極として透明導電膜を成膜してパターニングを行う
工程と、透明導電膜がパターニングされた基板の上面
に、ソース・ドレイン電極となる第２の金属膜を成膜し
てソース・ドレイン電極部及び引出し電極の外周上部に
第２の金属膜を残存すべくパターニングを行う工程と、
次に絶縁保護膜を成膜する工程と、引出し電極に形成さ
れた絶縁保護膜のパターニングを行い、引出し電極の外
周部に第２の金属膜とゲート絶縁膜を一体にして残存さ
せる工程と、を含むことを特徴とするものである。According to a third aspect of the present invention, a step of forming an undercoat film of SiO 2 or TaOx (x is an integer) on an insulating transparent substrate, and a part of a gate electrode and an undercoat film are formed on the upper surface of the undercoat film. A step of forming and patterning a first metal film serving as an extraction electrode, a step of forming a gate insulating film of SiNx (x is an integer) on the upper surface of the substrate on which the first metal film is patterned, and a silicon semiconductor Forming a layer and a channel protection layer and patterning, forming a transparent conductive film as a pixel electrode and patterning, and forming a source / drain electrode on the upper surface of the substrate on which the transparent conductive film is patterned. Forming a second metal film, and patterning so that the second metal film remains on the outer periphery of the source / drain electrode portion and the extraction electrode.
Next, a step of forming an insulating protective film, a step of patterning the insulating protective film formed on the extraction electrode, and leaving the second metal film and the gate insulating film integrally on the outer peripheral portion of the extraction electrode, It is characterized by including.
【００１４】[0014]
【作用】このような特徴を有する請求項１の発明によれ
ば、引出し電極はゲート電極と同一の金属膜で形成さ
れ、外部回路と接続されて薄膜トランジスタの駆動信号
が入力される。この金属膜の外周部は、耐水性を有する
ゲート絶縁膜と、ソース及びドレイン電極を構成する他
の金属膜とで覆われる。そのため液晶表示装置が高湿度
下にあっても、引出し電極はソース及びドレイン電極を
構成する他の金属膜とゲート絶縁膜とで保護され、全面
に渡って腐食を生じなくなる。According to the invention of claim 1 having such a feature, the extraction electrode is formed of the same metal film as the gate electrode, and is connected to an external circuit to input the drive signal of the thin film transistor. The outer peripheral portion of the metal film is covered with a gate insulating film having water resistance and another metal film forming the source and drain electrodes. Therefore, even if the liquid crystal display device is under high humidity, the extraction electrode is protected by the other metal film forming the source and drain electrodes and the gate insulating film, and corrosion is not generated over the entire surface.
【００１５】又本願の請求項３の発明によれば、液晶表
示装置の最初の工程において、絶縁性透明基板上にＳｉ
Ｏ2 又はＴａＯｘのアンダーコート膜を形成する。次に
アンダーコート膜に一部が引出し電極となる第１の金属
膜を形成する。そしてアンダーコート膜及び第１の金属
膜の上にＳｉＮｘのゲート絶縁膜を形成する。更に画素
電極となる位置に透明導電膜を形成する。又、引出し電
極と接続される薄膜トランジスタの形成位置に、Ｓｉ半
導体層及びチャンネル保護層を形成する。次にチャンネ
ル保護層、画素電極、及びゲート絶縁膜が形成された引
出し電極の上面に、ソース・ドレイン電極となる第２の
金属膜を成膜してパターニングを行う。最後の工程では
引出し電極の外周部に第２の金属とゲート絶縁膜を一体
に残存するようパターニングを行う。そして引出し電極
にＴＡＢフィルムを熱圧着すると、仮にＴＡＢフィルム
と当接する第１の金属膜に水分が浸透しても、その腐食
領域は引出し電極の外周部まで進行しなくなる。このた
め耐湿性に優れた接続が得られる。According to the invention of claim 3 of the present application, Si is formed on the insulating transparent substrate in the first step of the liquid crystal display device.
An undercoat film of O 2 or TaOx is formed. Next, a first metal film, a part of which serves as an extraction electrode, is formed on the undercoat film. Then, a gate insulating film of SiNx is formed on the undercoat film and the first metal film. Further, a transparent conductive film is formed at a position that will become a pixel electrode. Further, the Si semiconductor layer and the channel protection layer are formed at the formation position of the thin film transistor connected to the extraction electrode. Then, a second metal film to be a source / drain electrode is formed on the upper surface of the extraction electrode on which the channel protection layer, the pixel electrode, and the gate insulating film are formed, and patterning is performed. In the last step, patterning is performed so that the second metal and the gate insulating film remain integrally on the outer peripheral portion of the extraction electrode. When the TAB film is thermocompression-bonded to the extraction electrode, even if moisture penetrates into the first metal film contacting the TAB film, the corroded region does not proceed to the outer peripheral portion of the extraction electrode. Therefore, a connection with excellent moisture resistance can be obtained.
【００１６】[0016]
【実施例】本発明の一実施例における液晶表示装置とそ
の製造方法について図面を参照しつつ説明する。図１は
本実施例の液晶表示装置の全体構成を示す断面図であ
り、図２，図３は本実施例の引出し電極を中心とする液
晶表示装置の製造工程の説明図である。又図４は本実施
例の引出し電極部分の構成を示す平面図である。尚従来
例と同一部分は同一の符号をつけ、その説明は省略す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal display device and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the overall configuration of the liquid crystal display device of this embodiment, and FIGS. 2 and 3 are explanatory views of the manufacturing process of the liquid crystal display device centering on the extraction electrode of this embodiment. FIG. 4 is a plan view showing the structure of the extraction electrode portion of this embodiment. The same parts as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted.
【００１７】先ず図１及び図２（ａ）に示すように第１
の工程として絶縁性透明基板としてのガラス基板２上
に、ＳｉＯ2 又はＴａＯｘ（ｘは整数）のアンダーコー
ト膜３を全面形成する。第２の工程として、アンダーコ
ート膜３上に第１の金属膜としてＡｌ膜又はＡｌ合金膜
を成膜し、更にパターニングによりゲート電極１とその
引出し電極１ａを形成する。First, as shown in FIGS. 1 and 2A, the first
In this step, the undercoat film 3 of SiO 2 or TaOx (x is an integer) is entirely formed on the glass substrate 2 as the insulating transparent substrate. As a second step, an Al film or an Al alloy film is formed as a first metal film on the undercoat film 3, and then the gate electrode 1 and its extraction electrode 1a are formed by patterning.
【００１８】次に図２（ａ）に示すように第３の工程と
して従来例と同様にゲート絶縁膜４を全面に成膜する。
そして図１のＴＦＴ部に示すようにゲート電極１の上部
にシリコン半導体層１０及びチャンネル保護膜用の層間
絶縁膜を成膜する。第４の工程ではゲート電極１上のチ
ャネル保護膜１１をパターニングする。更に第５の工程
としてｎ+ シリコン膜を成膜し、後の工程のＴＦＴ形成
のためにｎ+ シリコン膜及びシリコン半導体層１０をパ
ターニングする。Next, as shown in FIG. 2A, as a third step, a gate insulating film 4 is formed on the entire surface as in the conventional example.
Then, as shown in the TFT portion of FIG. 1, the silicon semiconductor layer 10 and the interlayer insulating film for the channel protective film are formed on the gate electrode 1. In the fourth step, the channel protection film 11 on the gate electrode 1 is patterned. Further, as a fifth step, an n + silicon film is formed, and the n + silicon film and the silicon semiconductor layer 10 are patterned to form a TFT in a later step.
【００１９】次に図１の画素電極部及び図２（ｂ）に示
すように、第６の工程として画素電極１２となるべき位
置上にＩＴＯの透明導電膜１２ａを成膜し、パターニン
グすする。Next, as shown in the pixel electrode portion of FIG. 1 and FIG. 2B, a transparent conductive film 12a of ITO is formed and patterned on a position to be the pixel electrode 12 in a sixth step. .
【００２０】第７の工程として図１のＴＦＴ部及び画素
電極部に示すように、ＴＦＴのソース及びドレイン電極
となる第２の金属膜１３として、Ｔｉ，Ａｌを成膜す
る。このとき引出し電極１ａ上にも金属膜１３を成膜す
る。そして金属膜１３のパターニングを行い、図１及び
図２（ｃ）に示すようにＴＦＴのソース・ドレイン電極
と引出し電極１ａの外周部に金属膜１３を夫々残存させ
る。更に図３（ｄ）に示すように、第８の工程として絶
縁保護膜５としてＳｉＮｘを成膜する。こうすると引出
し電極１ａの外周部には、ゲート絶縁膜４を介して金属
膜１３が形成され、更にその上に絶縁保護膜５が成膜さ
れる。又引出し電極１ａの中央部には、ＳｉＮｘのゲー
ト絶縁膜４及び絶縁保護膜５が成膜される。As a seventh step, as shown in the TFT section and the pixel electrode section of FIG. 1, Ti and Al are formed as the second metal film 13 which becomes the source and drain electrodes of the TFT. At this time, the metal film 13 is also formed on the extraction electrode 1a. Then, the metal film 13 is patterned, and the metal film 13 is left on the outer peripheral portions of the source / drain electrodes of the TFT and the extraction electrode 1a as shown in FIGS. 1 and 2C. Further, as shown in FIG. 3D, SiNx is formed as the insulating protection film 5 in the eighth step. Thus, the metal film 13 is formed on the outer peripheral portion of the extraction electrode 1a via the gate insulating film 4, and the insulating protective film 5 is further formed thereon. Further, a gate insulating film 4 and an insulating protective film 5 of SiNx are formed in the central portion of the extraction electrode 1a.
【００２１】最後に第９の工程として、レジスト６を絶
縁保護膜５の特定部分に成膜する。そしてレジスト６を
マスクとしてドライエッチングを行い、絶縁保護膜５と
ゲート絶縁膜４をパターン形成する。即ち図４に示すよ
うに複数の引出し電極１ａが隣接した部分に開口部７を
設ける。こうすると図３（ｅ）に示すように、引出し電
極１ａの中央部と周辺に成膜された絶縁保護膜５，ゲー
ト絶縁膜４が夫々除去される。この結果引出し電極１ａ
において、ゲート絶縁膜４を介し額縁状の金属膜１３が
露出し、引出し電極１ａの断面は凹状となる。Finally, as a ninth step, a resist 6 is formed on a specific portion of the insulating protective film 5. Then, dry etching is performed using the resist 6 as a mask to pattern the insulating protective film 5 and the gate insulating film 4. That is, as shown in FIG. 4, the opening 7 is provided in the portion where the plurality of extraction electrodes 1a are adjacent to each other. As a result, as shown in FIG. 3E, the insulating protective film 5 and the gate insulating film 4 formed in the central portion and the periphery of the extraction electrode 1a are removed. As a result, the extraction electrode 1a
At, the frame-shaped metal film 13 is exposed through the gate insulating film 4, and the cross section of the extraction electrode 1a becomes concave.
【００２２】このように形成された引出し電極１ａの評
価を行うため、高温高湿下の湿中試験を行った。この結
果、引出し電極１ａのＸ−Ｘ断面形状は図３（ｆ）のよ
うに変化し、引出し電極１ａのＡｌ消失は中央部のみで
治まる結果となり、外周部のＡｌは残存した。In order to evaluate the extraction electrode 1a thus formed, a wet test under high temperature and high humidity was conducted. As a result, the X-X cross-sectional shape of the extraction electrode 1a changed as shown in FIG. 3 (f), the disappearance of Al in the extraction electrode 1a was stopped only in the central portion, and Al in the outer peripheral portion remained.
【００２３】又図４に示すように、本実施例で得られた
引出し電極１ａにＴＡＢフィルム８を熱圧着により取付
けて湿中試験を行った。この場合図４の斜線部に示すよ
うに額縁状の金属膜１３が保護膜の役割を果たし、Ａｌ
消失のストッパーとなることが判った。このため引出し
電極１ａの断線は生じなくなり、開口部７は簡易マスク
を用いて形成しているので、ＴＡＢフィルム８の接合は
容易に行える。Further, as shown in FIG. 4, a TAB film 8 was attached to the extraction electrode 1a obtained in this example by thermocompression bonding, and a wet test was conducted. In this case, the frame-shaped metal film 13 serves as a protective film as shown by the hatched portion in FIG.
It turned out to be a stopper for disappearance. Therefore, disconnection of the extraction electrode 1a does not occur, and since the opening 7 is formed using a simple mask, the TAB film 8 can be easily joined.
【００２４】尚、本実施例では引出し電極部に残すゲー
ト絶縁層１４及び金属層１３の形状を額縁状としたが、
Ｌ字型、コの字型でも良く、その目的は達せられる。ソ
ース・ドレイン金属膜の形成にあたり下地にゲート絶縁
膜を設けたが、絶縁保護膜と同じＳｉＮｘ膜であればど
のレイヤの層間絶縁膜であっても良い。In this embodiment, the shapes of the gate insulating layer 14 and the metal layer 13 left in the extraction electrode portion are frame-shaped.
It can be L-shaped or U-shaped, and its purpose can be achieved. Although the gate insulating film is provided as the base for forming the source / drain metal film, any layer of the interlayer insulating film may be used as long as it is the same SiNx film as the insulating protective film.
【００２５】[0025]
【発明の効果】以上のように本願の請求項１の発明によ
れば、ゲート電極と同一の金属膜で形成されたゲート引
出し電極の周囲上に耐湿性に優れたゲート絶縁膜と、ソ
ース及びドレイン電極と同一の金属膜とを配置してい
る。このため引出し電極の金属膜の湿中腐食が生じにく
くなり、ＴＡＢフィルムを介して外部回路と接続して液
晶表示装置を長時間使用しても、引出し電極の断線が無
くなる。As described above, according to the invention of claim 1 of the present application, a gate insulating film excellent in moisture resistance is provided on the periphery of the gate extraction electrode formed of the same metal film as the gate electrode, and the source and The drain electrode and the same metal film are arranged. For this reason, corrosion of the metal film of the extraction electrode in the wet condition is unlikely to occur, and even if the liquid crystal display device is used for a long time by connecting to the external circuit through the TAB film, the disconnection of the extraction electrode is eliminated.
【００２６】又本願の請求項３の発明によれば、引出し
電極の形成工程と液晶セルを駆動する薄膜トランジスタ
の製造工程を共通にしているので、従来の薄膜トランジ
スタの製造工程の一部を変更するだけで、耐湿性に優れ
た引出し電極が製造できる。又引出し電極部のマスク合
わせも簡易化され、液晶表示装置の製造工程が簡略化さ
れる効果が得られる。Further, according to the invention of claim 3 of the present application, since the forming process of the extraction electrode and the manufacturing process of the thin film transistor for driving the liquid crystal cell are common, only a part of the conventional manufacturing process of the thin film transistor is changed. Thus, the extraction electrode having excellent moisture resistance can be manufactured. Also, the mask alignment of the extraction electrode portion is simplified, and the manufacturing process of the liquid crystal display device is simplified.
【図１】本発明の一実施例の液晶表示装置の全体構成を
示す断面図である。FIG. 1 is a cross-sectional view showing an overall configuration of a liquid crystal display device according to an embodiment of the present invention.
【図２】本発明の一実施例の引出し電極を中心とする液
晶表示装置の製造方法を示す工程図（その１）である。FIG. 2 is a process diagram (1) showing the method of manufacturing the liquid crystal display device centering on the extraction electrode according to the embodiment of the present invention.
【図３】本実施例における引出し電極を中心とする液晶
表示装置の製造方法を示す工程図（その２）である。FIG. 3 is a process diagram (2) showing the method of manufacturing the liquid crystal display device with the extraction electrode as the center in the present embodiment.
【図４】本実施例の液晶表示装置の引出し電極部分を示
す平面図である。FIG. 4 is a plan view showing a lead electrode portion of the liquid crystal display device of the present embodiment.
【図５】引出し電極を中心とする液晶表示装置の従来の
製造方法を示す工程図である。FIG. 5 is a process drawing showing a conventional manufacturing method of a liquid crystal display device centering on a lead electrode.
【図６】従来例（その１）の液晶表示装置の引出し電極
部分を示す平面図である。FIG. 6 is a plan view showing a lead electrode portion of a liquid crystal display device of a conventional example (No. 1).
【図７】従来例（その２）の液晶表示装置の引出し電極
部分を示す平面図である。FIG. 7 is a plan view showing an extraction electrode portion of a liquid crystal display device of a conventional example (No. 2).
１ ゲート電極 １ａ 引出し電極 ２ ガラス基板 ３ アンダーコート膜 ４ ゲート絶縁膜 ５ 絶縁保護膜 ６ レジスト ７，９ 開口部 ８ ＴＡＢフィルム １０ シリコン半導体層 １１ チャンネル保護膜 １２ 画素電極 １２ａ 透明導電膜 １３ 第２の金属 DESCRIPTION OF SYMBOLS 1 gate electrode 1a extraction electrode 2 glass substrate 3 undercoat film 4 gate insulating film 5 insulating protective film 6 resist 7,9 opening 8 TAB film 10 silicon semiconductor layer 11 channel protective film 12 pixel electrode 12a transparent conductive film 13 second metal
Claims (4)
れ、ソース及びドレイン電極を有する薄膜トランジスタ
と、 前記薄膜トランジスタによって駆動される液晶セルと、 前記薄膜トランジスタの駆動信号を入力するゲート電極
と、 外部回路と接続されて前記薄膜トランジスタのゲート電
極に駆動信号を与え、Ａｌ又はＡｌ合金で成膜された引
出し電極と、を有する液晶表示装置において、 前記薄膜トランジスタのゲート絶縁膜を介して前記ソー
ス及びドレイン電極を構成する耐水性の金属膜を前記引
出し電極の外周部に設けたことを特徴とする液晶表示装
置。1. A thin film transistor arranged in an array on an insulating transparent substrate and having source and drain electrodes, a liquid crystal cell driven by the thin film transistor, a gate electrode for inputting a driving signal of the thin film transistor, and an external circuit. In the liquid crystal display device, which is connected to the gate electrode of the thin film transistor and supplies a drive signal to the thin film transistor, and a lead electrode formed of Al or an Al alloy, the source and drain electrodes are connected via the gate insulating film of the thin film transistor. A liquid crystal display device, comprising a water-resistant metal film constituting the outer peripheral portion of the extraction electrode.
金属膜は、Ａｌ膜又はＡｌ合金膜とＴｉ膜との多層膜か
ら形成されるものであることを特徴とする請求項１記載
の液晶表示装置。2. The liquid crystal display device according to claim 1, wherein the metal film forming the source and drain electrodes is formed of a multilayer film of an Al film or an Al alloy film and a Ti film. .
ｘ（ｘは整数）のアンダーコート膜を形成する工程と、 前記アンダーコート膜の上面に、一部がゲート電極及び
引出し電極になる第１の金属膜を成膜してパターニング
を行う工程と、 前記第１の金属膜がパターニングされた基板上面にＳｉ
Ｎｘ（ｘは整数）のゲート絶縁膜を形成する工程と、 シリコン半導体層及びチャンネル保護層を成膜してパタ
ーニングを行う工程と、 画素電極として透明導電膜を成膜してパターニングを行
う工程と、 前記透明導電膜がパターニングされた基板の上面に、ソ
ース・ドレイン電極となる第２の金属膜を成膜してソー
ス・ドレイン電極部及び前記引出し電極の外周上部に第
２の金属膜を残存すべくパターニングを行う工程と、 次に絶縁保護膜を成膜する工程と、 前記引出し電極に形成された前記絶縁保護膜のパターニ
ングを行い、前記引出し電極の外周部に前記第２の金属
膜と前記ゲート絶縁膜を一体にして残存させる工程と、
を含むことを特徴とする液晶表示装置の製造方法。3. SiO 2 or TaO on an insulating transparent substrate.
a step of forming an undercoat film of x (x is an integer), a step of forming and patterning a first metal film, a part of which serves as a gate electrode and an extraction electrode, on the upper surface of the undercoat film; Si is formed on the upper surface of the substrate on which the first metal film is patterned.
A step of forming a gate insulating film of Nx (x is an integer), a step of forming a silicon semiconductor layer and a channel protective layer and performing patterning, and a step of forming a transparent conductive film as a pixel electrode and performing patterning A second metal film to be a source / drain electrode is formed on the upper surface of the substrate on which the transparent conductive film is patterned, and the second metal film is left on the outer periphery of the source / drain electrode portion and the extraction electrode. Patterning so as to achieve the following: a step of forming an insulating protective film; a step of patterning the insulating protective film formed on the extraction electrode; and a second metal film on the outer peripheral portion of the extraction electrode. A step of integrally leaving the gate insulating film,
A method for manufacturing a liquid crystal display device, comprising:
金膜とＴｉ膜との多層膜から形成されるものであること
を特徴とする請求項３記載の液晶表示装置の製造方法。4. The method of manufacturing a liquid crystal display device according to claim 3, wherein the second metal film is formed of a multilayer film of an Al film or an Al alloy film and a Ti film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25925593A JP3076705B2 (en) | 1993-09-21 | 1993-09-21 | Liquid crystal display device and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25925593A JP3076705B2 (en) | 1993-09-21 | 1993-09-21 | Liquid crystal display device and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0792497A true JPH0792497A (en) | 1995-04-07 |
| JP3076705B2 JP3076705B2 (en) | 2000-08-14 |
Family
ID=17331567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25925593A Expired - Fee Related JP3076705B2 (en) | 1993-09-21 | 1993-09-21 | Liquid crystal display device and method of manufacturing the same |
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| Country | Link |
|---|---|
| JP (1) | JP3076705B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2761812A1 (en) * | 1997-04-03 | 1998-10-09 | Lg Electronics Inc | LIQUID CRYSTAL DISPLAY AND METHOD FOR MANUFACTURING SUCH A DISPLAY |
| JP4493744B2 (en) * | 1998-12-28 | 2010-06-30 | シャープ株式会社 | Substrate for liquid crystal display device and manufacturing method thereof |
-
1993
- 1993-09-21 JP JP25925593A patent/JP3076705B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2761812A1 (en) * | 1997-04-03 | 1998-10-09 | Lg Electronics Inc | LIQUID CRYSTAL DISPLAY AND METHOD FOR MANUFACTURING SUCH A DISPLAY |
| US6163356A (en) * | 1997-04-03 | 2000-12-19 | Lg Electronics | Liquid crystal display with enhanced gate pad protection and method of manufacturing the same |
| JP4493744B2 (en) * | 1998-12-28 | 2010-06-30 | シャープ株式会社 | Substrate for liquid crystal display device and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3076705B2 (en) | 2000-08-14 |
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