JPS63137472A - Forming method of thin-film transistor - Google Patents
Forming method of thin-film transistorInfo
- Publication number
- JPS63137472A JPS63137472A JP61284822A JP28482286A JPS63137472A JP S63137472 A JPS63137472 A JP S63137472A JP 61284822 A JP61284822 A JP 61284822A JP 28482286 A JP28482286 A JP 28482286A JP S63137472 A JPS63137472 A JP S63137472A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- film
- bus line
- gate
- forming
- 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
Links
- 239000010409 thin film Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000010408 film Substances 0.000 claims abstract description 40
- 239000000758 substrate Substances 0.000 claims abstract description 16
- 239000004065 semiconductor Substances 0.000 claims abstract description 14
- 238000002955 isolation Methods 0.000 claims abstract description 7
- 238000005530 etching Methods 0.000 claims abstract description 5
- 238000000926 separation method Methods 0.000 claims 1
- 239000011521 glass Substances 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 238000000059 patterning Methods 0.000 abstract description 3
- 238000007493 shaping process Methods 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000010365 information processing Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
この発明は、スタガード型の薄膜トランジスタのドレイ
ン及びソース電極が透明導電膜とn“層の2Nで形成さ
れており、ドレイン及びソース電極と基板との段差が大
きく動作半導体の均一被覆が困難であるために、ドレイ
ン及びソース電極をn+層のみで形成し、素子分離の後
で透明導電膜を形成するようにし、段差を減少し薄膜ト
ランジスタの品質向上を可能とする。[Detailed Description of the Invention] [Summary] The present invention is characterized in that the drain and source electrodes of a staggered thin film transistor are formed of a transparent conductive film and an n'' layer of 2N, and the difference in level between the drain and source electrodes and the substrate is large. Since it is difficult to uniformly cover the operating semiconductor, the drain and source electrodes are formed only with an n+ layer, and a transparent conductive film is formed after device isolation, which reduces the step difference and improves the quality of thin film transistors. .
この発明は、データ入力用のパスラインとラインアドレ
ス用のスキャンパスラインとを対向する2枚のガラス基
板に設けたアクティブマトリックス形表示装置の薄膜ト
ランジスタの形成法に関するものである。The present invention relates to a method of forming a thin film transistor of an active matrix display device in which a data input path line and a line address scan path line are provided on two opposing glass substrates.
アクティブマトリックス形表示装置は単純マトリックス
形表示装置と共に情報処理装置の端末として使用されて
おり、表示媒体としては液晶が用いられている。Active matrix display devices are used together with simple matrix display devices as terminals of information processing devices, and liquid crystal is used as the display medium.
ここで両者の特性を比較すると、アクティブマトリック
ス形は多数ある画素をそれぞれ独立に駆動させることが
でき、そのため表示容量の増大に伴ってライン数が増加
しても単純マトリックスのように駆動のデユーティ比が
低下したり、コントラストの低下、視野の減少をきたさ
ないという利点がある。Comparing the characteristics of the two, the active matrix type can drive a large number of pixels independently, so even if the number of lines increases with the increase in display capacity, the driving duty ratio remains the same as that of the simple matrix type. It has the advantage that it does not cause a decrease in color, contrast, or visual field.
第4図は従来のスタガード型の薄膜トランジスタの平面
図、第5図は平面図を面線に沿って切断した断面図であ
る。即ち、従来の薄膜トランジスタは、第5図に示すよ
うに透明絶縁基板、即ちガラス基板1の上に透明導電膜
9とn+層2を積層して形成し、この2層でドレイン電
極40と第4図に示すドレインパスライン10−1とソ
ース電極30及び画素電極11を形成する。FIG. 4 is a plan view of a conventional staggered thin film transistor, and FIG. 5 is a cross-sectional view of the plan view taken along a plane line. That is, the conventional thin film transistor is formed by laminating a transparent conductive film 9 and an n+ layer 2 on a transparent insulating substrate, that is, a glass substrate 1, as shown in FIG. A drain pass line 10-1, a source electrode 30, and a pixel electrode 11 shown in the figure are formed.
この上に動作半導体膜5と更にその上にゲート絶縁膜6
、ゲート電極を形成するゲートバスライン7を形成して
薄膜トランジスタは製作されている。On top of this is an active semiconductor film 5 and further on that is a gate insulating film 6.
A thin film transistor is manufactured by forming a gate bus line 7 that forms a gate electrode.
従来のスタガード型薄膜トランジスタは、ドレイン、ソ
ース電極、画素電極が、透明導電膜とn+層の2層で形
成されているので、ガラス基板との段差が大きくなり、
そのためこの上に形成される動作半導体膜が、これら各
電極を均一に被覆できない。つまり電極のカバーレッジ
が悪(絶縁被覆不十分のためにゲート・ドレイン電極間
或いは、ゲート・ソース電極間で短絡を生ずるといった
問題があった。In conventional staggered thin film transistors, the drain, source electrode, and pixel electrode are formed of two layers: a transparent conductive film and an n+ layer, so there is a large difference in level from the glass substrate.
Therefore, the active semiconductor film formed thereon cannot uniformly cover each of these electrodes. In other words, there was a problem in that the coverage of the electrodes was poor (insufficient insulation coating caused short circuits between the gate and drain electrodes or between the gate and source electrodes).
この発明は、上記した従来の状況から、絶縁被覆状態が
よく高品質の薄膜トランジスタを効率よく形成で、きる
方法の提供を目的とするものである。SUMMARY OF THE INVENTION In view of the above-mentioned conventional situation, it is an object of the present invention to provide a method for efficiently forming a high-quality thin film transistor with a good insulation coating state.
この発明では、透明絶縁基板にn1層のみでソース電極
とコモン電極を形成し、この上に動作半導体膜とゲート
絶縁膜を順次形成し、さらにこの上にゲートバスライン
を形成した後に、ゲート絶縁膜と動作半導体膜を所定の
パターンでエツチングをして素子分離をする。このエツ
チングにより露出した前記ソース電極およびコモン電極
の上に透明導電膜を積層して、ソース電極と接続された
画素およびコモン電極と接続されたコモンバスラインを
それぞれ形成する。In this invention, a source electrode and a common electrode are formed using only the n1 layer on a transparent insulating substrate, an operating semiconductor film and a gate insulating film are sequentially formed on this, a gate bus line is formed on this, and then a gate insulating film is formed on the transparent insulating substrate. The film and the active semiconductor film are etched in a predetermined pattern to isolate the elements. A transparent conductive film is laminated on the source electrode and common electrode exposed by this etching to form a pixel connected to the source electrode and a common bus line connected to the common electrode, respectively.
各電極は、n+層のみで形成されるので電極と基板との
段差が小さくなり、動作半導体膜を被覆する際に、カバ
ーレートがよくなり電極間短絡が防止される。Since each electrode is formed of only the n+ layer, the difference in level between the electrode and the substrate is reduced, and when covering the active semiconductor film, the cover rate is improved and short circuits between the electrodes are prevented.
第1図は本発明の一実施例による薄膜トランジスタの平
面図、第2図はその平面図をAA線に沿って切断した断
面図、第3図は同じ<BB線に沿って切断した断面図で
ある。この薄膜トランジスタは対向型であり、この対向
型は、従来のコモン電極をライン状に形成しデータバス
ラインとし、従来のドレインパスラインをコモンバスラ
インとしたものである。FIG. 1 is a plan view of a thin film transistor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the plan view taken along line AA, and FIG. 3 is a cross-sectional view taken along the same <BB line. be. This thin film transistor is of a facing type, and in this facing type, a conventional common electrode is formed in a line shape to serve as a data bus line, and a conventional drain pass line is used as a common bus line.
第2図に示すように、まず透明絶縁基板、即ちガラス基
板1の上にn+層2を形成する。次に、第1図のコモン
電極4とソース電極3を形成するために、パターニング
とエツチング処理をこのn+層2に行う。次いで、この
コモン、ソース電極上に動作半導体膜5とゲート絶縁膜
6を順次形成する。さらにこのゲート絶縁膜6の上にゲ
ート用の導電膜を形成後、パターニングを行いゲートバ
スライン7を形成する。As shown in FIG. 2, first, an n+ layer 2 is formed on a transparent insulating substrate, that is, a glass substrate 1. Next, patterning and etching processes are performed on this n+ layer 2 in order to form the common electrode 4 and source electrode 3 shown in FIG. Next, an active semiconductor film 5 and a gate insulating film 6 are sequentially formed on the common and source electrodes. Furthermore, after forming a conductive film for a gate on this gate insulating film 6, patterning is performed to form a gate bus line 7.
このゲートバスライン7を形成した後に、素子分離を行
、う。この素子分離は、第1図の一点鎖線で囲んで示す
部分以外のゲート絶縁膜6と動作半導体膜5をエツチン
グ除去する。なおこのエノチングは、ゲートバスライン
7をマスクパターンに使用して行っても何等支障なく、
そうすることが使用パターンマスク数の数の減少を図る
上に望ましい。After forming this gate bus line 7, element isolation is performed. This element isolation is performed by etching away the gate insulating film 6 and the active semiconductor film 5 other than the portion shown surrounded by the dashed line in FIG. Note that this enoching can be performed without any problem even if the gate bus line 7 is used as a mask pattern.
It is desirable to do so in order to reduce the number of pattern masks used.
このゲートバスラインパターンを使用して素子分離を行
った後、第3図に示すように、n1層2を含む基板上に
画素電極11とコモンバスライン10を形成するレジス
トパターン(図示せず)を形成し、さらに透明導電膜9
をレジストパターン上に形成して、リフトオフ法によっ
て画素電極11とコモンバスライン10を形成する。こ
の際、第1図の斜線部で示すコモン電極4.ソース電極
3のn+層2は透明導電膜と重なる状態にして該ソース
電極を画素電極11.コモン電橋4をコモンバスライン
10とそれぞれ接続する。After element isolation is performed using this gate bus line pattern, as shown in FIG. , and further a transparent conductive film 9
are formed on a resist pattern, and the pixel electrode 11 and common bus line 10 are formed by a lift-off method. At this time, the common electrode 4 shown in the shaded area in FIG. The n+ layer 2 of the source electrode 3 is overlapped with the transparent conductive film, and the source electrode is connected to the pixel electrode 11. The common electric bridges 4 are connected to the common bus lines 10, respectively.
この発明によれば、ゲートおよびソース電極と基板との
段差が小さくなり、その上に形成される動作半導体膜の
被覆の均一性が図れるので、ゲート電極とソース、ドレ
イン電極間の短絡が防止されて高品質の薄膜トランジス
タを作製する上できわめて有効な効果を奏する。According to this invention, the difference in level between the gate and source electrodes and the substrate is reduced, and the uniformity of the coating of the active semiconductor film formed thereon is ensured, thereby preventing short circuits between the gate electrode and the source and drain electrodes. This is extremely effective in producing high-quality thin film transistors.
第1図は本発明の一実施例による薄膜トランジスタの平
面図、
第2図は第1図をAA線に沿って切断した断面図、第3
図は第1図をBB線に沿って切断した断面図第4図は従
来のスタガード型の薄膜トランジスタの平面図、
第5図は第4図をAA線に沿って切断した断面図である
。
図において、1はガラス基板、2はn+層、3はソース
電極、4はコモン電極、5は動作半導体膜、6はゲート
絶縁膜、7はゲートバスライン、9は透明導電膜、10
はコモンバスライン、不滑に44.−宍こ月(伊’Je
Js簿生に1つし′”Zりq’f’hθゴ第1図
21M’t BB線+==’;x−ztN’7’t T
;折?m(XJ第3図
従来めズytt″−ド°型の」1#け〉ン゛ズタq乎面
a訂第4図
つP4 Ot AA=釆l−+s’;:i−7切# L
r= rfr i 口第5図FIG. 1 is a plan view of a thin film transistor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of FIG. 1 taken along line AA, and FIG.
4 is a plan view of a conventional staggered thin film transistor, and FIG. 5 is a sectional view of FIG. 4 taken along line AA. In the figure, 1 is a glass substrate, 2 is an n+ layer, 3 is a source electrode, 4 is a common electrode, 5 is an active semiconductor film, 6 is a gate insulating film, 7 is a gate bus line, 9 is a transparent conductive film, 10
is the common bus line, 44. -Shishikozuki (I'Je)
One for the Js book student'"Z riq'f'hθgo Figure 1 21M't BB line +==';
;Fold? m (XJ Fig. 3 Conventional female ytt''-do ° type' 1 # ゛〉〉〉〉〉〉〉〉〉〉〉 a〉 P4 L
r= rfr i Figure 5
Claims (2)
極(3)とコモン電極(4)を形成し、その上に動作半
導体膜(5)とゲート絶縁膜(6)とを順次形成し、さ
らにその上にゲートバスライン(7)を形成した後、所
定のパターンで前記ゲート絶縁膜(6)と動作半導膜(
5)とをエッチングして素子分離を行い、この素子分離
により露出した前記ソース電極(3)およびコモン電極
(4)の上に透明導電膜(9)を所定のパターンにて形
成して、ソース電極と接続された画素電極(11)およ
びコモン電極(4)と接続されたコモンバスライン(1
0)をそれぞれ形成することを特徴とする薄膜トランジ
スタの形成法。(1) A source electrode (3) and a common electrode (4) are formed using an n^+ layer (2) on a transparent insulating substrate (1), and an operating semiconductor film (5) and a gate insulating film (6) are formed on the transparent insulating substrate (1). After forming the gate bus line (7) on the gate bus line (7), the gate insulating film (6) and the active semiconductor film (6) are formed in a predetermined pattern.
5) is etched to perform device isolation, and a transparent conductive film (9) is formed in a predetermined pattern on the source electrode (3) and common electrode (4) exposed by this device separation, and the source A pixel electrode (11) connected to the electrode and a common bus line (1
1. A method for forming a thin film transistor, comprising forming each of 0).
をマスクにしてゲート絶縁膜(6)と動作半導体膜(5
)とを連続的にエッチングすることによって行われるこ
とを特徴とする特許請求の範囲第(1)項記載の薄膜ト
ランジスタの形成法。(2) The element isolation is performed using the gate bus line pattern as a mask to form a gate insulating film (6) and an active semiconductor film (5).
2. The method of forming a thin film transistor according to claim 1, wherein the method is carried out by sequentially etching.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61284822A JPS63137472A (en) | 1986-11-28 | 1986-11-28 | Forming method of thin-film transistor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61284822A JPS63137472A (en) | 1986-11-28 | 1986-11-28 | Forming method of thin-film transistor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63137472A true JPS63137472A (en) | 1988-06-09 |
Family
ID=17683456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61284822A Pending JPS63137472A (en) | 1986-11-28 | 1986-11-28 | Forming method of thin-film transistor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63137472A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100580391B1 (en) * | 1998-09-03 | 2007-03-02 | 삼성전자주식회사 | Polycrystalline silicon thin film transistor and thin film transistor substrate for liquid crystal display including the same and manufacturing method thereof |
-
1986
- 1986-11-28 JP JP61284822A patent/JPS63137472A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100580391B1 (en) * | 1998-09-03 | 2007-03-02 | 삼성전자주식회사 | Polycrystalline silicon thin film transistor and thin film transistor substrate for liquid crystal display including the same and manufacturing method thereof |
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