JPH04177222A - Liquid crystal display element - Google Patents
Liquid crystal display elementInfo
- Publication number
- JPH04177222A JPH04177222A JP30506290A JP30506290A JPH04177222A JP H04177222 A JPH04177222 A JP H04177222A JP 30506290 A JP30506290 A JP 30506290A JP 30506290 A JP30506290 A JP 30506290A JP H04177222 A JPH04177222 A JP H04177222A
- Authority
- JP
- Japan
- Prior art keywords
- polyimide
- copper foil
- tape
- liquid crystal
- crystal display
- 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
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000004642 Polyimide Substances 0.000 claims abstract description 32
- 229920001721 polyimide Polymers 0.000 claims abstract description 32
- 239000011889 copper foil Substances 0.000 claims abstract description 31
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000010949 copper Substances 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 abstract description 11
- 238000005452 bending Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 4
- 239000012790 adhesive layer Substances 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 230000003313 weakening effect Effects 0.000 abstract description 2
- 238000004806 packaging method and process Methods 0.000 abstract 2
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 240000004050 Pentaglottis sempervirens Species 0.000 description 2
- 235000004522 Pentaglottis sempervirens Nutrition 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000003984 copper intrauterine device Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0393—Flexible materials
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/36—Assembling printed circuits with other printed circuits
- H05K3/361—Assembling flexible printed circuits with other printed circuits
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はフレキシブルテープを用いて駆動ＸＣを実装す
る液晶表示素子に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display element in which a driving XC is mounted using a flexible tape.
従来の液晶表示素子の代表的な実装構造の一つの実施例
の断面図を第２図に示す。１は液晶表示パネル、２はＡ
ｔフレーム、５はプリント回路基板、４はＤｒ−ＩＣ，
Ｓは異方性導電膜、６は銅箔、７はポリイミドテープで
ある。FIG. 2 shows a cross-sectional view of one embodiment of a typical mounting structure of a conventional liquid crystal display element. 1 is the liquid crystal display panel, 2 is A
t-frame, 5 is a printed circuit board, 4 is Dr-IC,
S is an anisotropic conductive film, 6 is a copper foil, and 7 is a polyimide tape.
銅箔６とホ゛リイミドテープ７は接着削を用いて貼り合
わされ、いわゆる三層のフレキシブルテープを構成して
いる。第２図の構造の場合、フレキシブルテープの折り
曲げ部は、折り曲げ時のポリイミドと銅箔のはく離を避
け、折り曲げ易（するために、ポリイミドを取り除き、
銅箔のみのいわゆるオーバーハング構造となっている。The copper foil 6 and the polyimide tape 7 are bonded together using adhesive cutting to form a so-called three-layer flexible tape. In the case of the structure shown in Figure 2, the bending part of the flexible tape is made by removing the polyimide to avoid peeling of the polyimide and copper foil during bending and to make it easier to bend.
It has a so-called overhang structure made of only copper foil.
しかし、この折り曲げ部は銅箔のみになっているため、
機械的に弱（、外部からの機械的なダメ−ジを受は易い
欠点を持っている。また、温度サイクル試験にかげると
折り曲げ部の銅箔が切れて導通不良を引き起こす原因に
なっていた。However, since this bent part is made of only copper foil,
It has the disadvantage of being mechanically weak (easily susceptible to external mechanical damage).Also, when subjected to a temperature cycle test, the copper foil at the bent part breaks, causing poor continuity. .
そこで、本発明では、機械的に強（、長期の温度サイク
ル試験にも耐えうる折り曲げ部を有するフレキシブルテ
ープを用いて駆動ＩＣを実装することにより、高い信頼
性を有する液晶表示素子を実現することを目的とする。Therefore, in the present invention, a highly reliable liquid crystal display element is realized by mounting a drive IC using a flexible tape that is mechanically strong (and has a bending part that can withstand long-term temperature cycle tests). With the goal.
本発明の液晶表示素子は、少なくとも１ケ所以上をほぼ
直角に曲げられたフレキシブルテープを用いて駆動ＩＣ
を実装する液晶表示素子に於いてポリイミドテープに銅
をアディティブメッキしたいわゆる二層テープを用いた
ことを特徴とする。The liquid crystal display element of the present invention uses a flexible tape bent at at least one place at a substantially right angle to connect a drive IC.
The liquid crystal display device is characterized by the use of a so-called two-layer tape in which copper is additively plated on a polyimide tape.
また、折り曲げ部のポリイミドに列状に並んだ穴を開け
たことを特徴とする。Another feature is that a row of holes are drilled in the polyimide of the folded part.
また、折り曲げ部の銅箔パターンのパターン巾を他の部
分よりも狭くしたことを特徴とする。Another feature is that the pattern width of the copper foil pattern at the folded portion is narrower than at other portions.
フレキシブルテープの折り曲げ部の強度を上げるために
は、折り曲げ部の銅箔をポリイミドで裏うちすれば良い
が、従来のポリイミドと銅箔を接着剤で貼り合わせた、
いわゆる三層テープでは、折り曲げ部のはく離が起った
り、剛性が強（、折り曲げにくり、また、パネルと７Ｖ
キシプルテープの間の異方性導電膜での圧着部のはく離
を引き起こす可能性が高い。これに対して、ポリイミド
テープに銅をアディティブメッキした、いわゆる二層テ
ープは、ポリイミドと銅箔の密着強度が高（、また、接
着剤の層がないために、剛性が弱（折り曲げ易いため、
折り曲げ部の銅箔にポリイミドを裏うちすることが可能
となる。In order to increase the strength of the folded part of flexible tape, it is possible to back the copper foil at the folded part with polyimide.
With so-called three-layer tape, peeling may occur at the folded portion, the rigidity is too strong (it is difficult to bend, and the panel and 7V
There is a high possibility that the crimped part of the anisotropic conductive film between the xipul tapes will peel off. On the other hand, so-called two-layer tape, which is made by additively plating copper on polyimide tape, has high adhesion strength between the polyimide and copper foil (and has low rigidity because it does not have an adhesive layer (because it is easy to bend).
It becomes possible to apply polyimide to the copper foil at the bent portion.
また、折り曲げ部の折り曲げ性を良くするために、折り
曲げ部のポリイミド及び銅箔の剛性を弱める方法として
、ポリイミドに列状に並んだ穴を開けたり、銅箔パター
ンの巾を他の部分よりも狭（することが考えられる。以
下、実施例により本発明の詳細を示す。In addition, in order to improve the bendability of the bending part, as a method of weakening the rigidity of the polyimide and copper foil at the bending part, holes are drilled in rows in the polyimide, and the width of the copper foil pattern is made wider than other parts. Hereinafter, the details of the present invention will be shown with reference to Examples.
（実施例１）
本発明の纂工の実施例の断面を第１図（α）に示す。１
は液晶表示パネル、２はＡｔフレーム、３はプリント回
路基板、４は駆動ＩＣ１５は異方性導電膜、６は銅箔、
７はポリイミドテープである。このフレキシブルテープ
はポリイミドのテープに銅箔をアディティブメッキして
形成された、いわゆる、二層テープを用いて作られてい
るため、従来の接着剤による貼り合わされている、いわ
ゆる、三層テープに比べて、折り曲げ易いため、折り曲
げ部のポリイミドを取り除く、スリット構造を作る必要
がない。このため、折り曲げ部の銅箔の強度が増し、信
頼性の高い駆動ＩＣの実装構造が実現できるのである。(Example 1) A cross section of an example of the construction of the present invention is shown in FIG. 1 (α). 1
is a liquid crystal display panel, 2 is an At frame, 3 is a printed circuit board, 4 is a drive IC 15 is an anisotropic conductive film, 6 is a copper foil,
7 is a polyimide tape. This flexible tape is made using so-called two-layer tape, which is formed by additively plating copper foil on polyimide tape, so it is compared to so-called three-layer tape, which is pasted together using conventional adhesives. Since it is easy to bend, there is no need to remove the polyimide from the bent portion or create a slit structure. Therefore, the strength of the copper foil at the bent portion is increased, and a highly reliable drive IC mounting structure can be realized.
このような、フレキシブルテープの折り曲げ部が実現で
きる二層テープであるが、そのままではまだ剛性が強（
、折り曲げ部の円弧状の半径が大きくなり、スペースの
利用効率が悪（なってしまう。このため、折り曲げ部の
ポリイミドに列状に並んだ穴を設けることが考えられる
。第１図（ｈ）はこの実施例の液晶表示素子の鳥かん図
であり、フレキシブルテープの折り曲げ部のポリイミド
に５列の穴８が銅箔のパターンとパターンの間に形成さ
れている。ポリイミドの穴はフレキシブルテープの駆動
ＩＣが入る穴、いわゆるデバイスホールの形成時に同時
にフォトエツチングプロセスにより形成できるため製作
費用のアップはほとんどない。このような穴を設けるこ
とにより、特定の部分の剛性が小さくなるため、折り曲
げ易くなる。また、液晶表示パネル１との間の圧着部の
異方性導電膜を引きはがそうとする力（以下３スプリン
グバツク”と呼ぶ。）を減少させることができる。Although this double-layer tape can realize the bending part of a flexible tape, it is still too rigid (
, the radius of the arc shape of the bent portion becomes large, resulting in poor space utilization efficiency.For this reason, it is considered to provide holes arranged in a row in the polyimide of the bent portion. Fig. 1 (h) is a bird's-eye view of the liquid crystal display element of this example, in which five rows of holes 8 are formed between the copper foil patterns in the polyimide at the folded part of the flexible tape.The polyimide holes are used to drive the flexible tape. There is almost no increase in manufacturing costs because the holes for ICs, so-called device holes, can be formed at the same time as the photo-etching process.By providing such holes, the rigidity of specific parts is reduced, making it easier to bend. Further, the force (hereinafter referred to as "3 springback") that tends to peel off the anisotropic conductive film at the crimped portion between the liquid crystal display panel 1 and the liquid crystal display panel 1 can be reduced.
表１には穴を開けることのスプリングバックへの効果を
測定した結果を示す。測定は、第６図のように、万力に
テープをはさみブシュプルゲージで直角に曲がるまで押
し付けてプシュカを測定するという方法を採った。９は
万力、１０はフレキシブルテープ、１１はブシュプルゲ
ージである。Table 1 shows the results of measuring the effect of making holes on springback. For the measurement, as shown in Figure 6, the tape was held in a vise and pressed with a pushpull gauge until it bent at a right angle, and the pushka was measured. 9 is a vise, 10 is a flexible tape, and 11 is a bush pull gauge.
サンプルは厚み５５μｍのカプトン、幅が４９閣、銅箔
なしの状態で測定した。穴径は１５０μｍφのものが１
２０ケ、３列に並んでいる。The sample was measured with a Kapton thickness of 55 μm, a width of 49 μm, and no copper foil. The hole diameter is 150μmφ.
20 people lined up in 3 rows.
このようにホ゛リイミドに穴を開けることにより約２０
５’のスプリングバックが軽減できることがわかる。By making holes in polyimide in this way, approximately 20
It can be seen that the springback of 5' can be reduced.
（実施例２）
実施例１よりも更にスプリングバックを軽減するために
、スプリングバックに対する銅箔の寄与を測定した結果
が表２であり、ポリイミドに銅箔を全面付けたものと付
けないものでスプリングバックを比較した。(Example 2) In order to further reduce springback than in Example 1, Table 2 shows the results of measuring the contribution of copper foil to springback, with and without copper foil applied to the entire surface of polyimide. Compare springback.
表２ スプリングバックに対する銅箔の効果衣２から、
銅箔の寄与はポリイミドの約４倍の寄与があることがわ
かる。このため、スプリングバックを軽減するためには
、折り曲げ部の銅箔パターンを細（することが考えられ
る。実施例２の液晶表示素子用のフレキシブルテープの
折り曲げ部のパターン拡大図を第４図に示す。折り曲げ
部の銅箔パターンの巾が他の部分に比較して細くするこ
とにより折り曲げ性を良（している。Table 2 From copper foil effect 2 against springback,
It can be seen that the contribution of copper foil is about four times that of polyimide. Therefore, in order to reduce springback, it may be possible to make the copper foil pattern at the bent part thinner. Figure 4 shows an enlarged view of the pattern at the bent part of the flexible tape for a liquid crystal display element in Example 2. The width of the copper foil pattern at the folded portion is made thinner than the other portions to improve bendability.
また、本実施例は折り曲げ部の半径が一様になるように
ポリイミドの穴を長穴としている。Further, in this embodiment, the holes in the polyimide are elongated so that the radius of the bent portion is uniform.
以上述べたように本発明によれば、ポリイミドに列状に
並んだ穴を開けたり、折り曲げ部の銅箔パターンを細く
した、二層テープを用いて、駆動ＩＣを実装すれば、高
信頼性の液晶表示素子が実現できるのである。As described above, according to the present invention, high reliability can be achieved by mounting the drive IC using a two-layer tape with holes arranged in rows in polyimide and a thin copper foil pattern at the bent portion. This makes it possible to realize a liquid crystal display element.
第１図（α）ｓ（ｂ）は各々、実施例１の液晶表示素子
の断面図及び鳥かん図である。
第２図は従来例の液晶表示素子の断面図である。
第３図はスプリングバックの測定方法を示した図である
。
第４図は実施例２のフレキシブルテープの折り曲げ部の
拡大図である。
１・・・・・・・・・液晶表示パネル
２・・・・・・・・・Ａｔフレーム
３・・・・・・・・・プリント回路基板４・・・・・・
・・・駆動ＩＣ
５・・・・・・・・・異方性導電膜
６・・・・・・・・・銅箔
７・・・・・・・・・ポリイミドテープ８・・・・・・
・・・穴
９・・・・・・・・・万 力
１０・・・・・・・・・フレキシブルテープ１１・・・
・・・・・・ブシュプルゲージ以上
出願人 セイコーエプソン株式会社
代理人 弁理出 鈴木喜三部（他１名）第１日（ｂ）FIGS. 1(α) and s(b) are a cross-sectional view and a bird's-eye view of the liquid crystal display element of Example 1, respectively. FIG. 2 is a sectional view of a conventional liquid crystal display element. FIG. 3 is a diagram showing a method for measuring springback. FIG. 4 is an enlarged view of the bent portion of the flexible tape of Example 2. 1......Liquid crystal display panel 2...At frame 3...Printed circuit board 4...
...Drive IC 5...Anisotropic conductive film 6...Copper foil 7...Polyimide tape 8...・
... Hole 9 ... Vise 10 ... Flexible tape 11 ...
...Applicant for bush pull gauges and above Seiko Epson Co., Ltd. Attorney Attorney Kizobe Suzuki (and 1 other person) 1st day (b)
Claims (3)
レキシブルテープを用いて駆動ＩＣを実装する液晶表示
素子に於いて、ポリイミドテープに銅をアディティブメ
ッキした、いわゆる二層テープを用いたことを特徴とす
る液晶表示素子。(1) A liquid crystal display device in which a drive IC is mounted using a flexible tape bent almost at right angles in at least one place, characterized by the use of a so-called two-layer tape in which copper is additively plated on a polyimide tape. A liquid crystal display element.
たことを特徴とする請求項１記載の液晶表示素子。(2) The liquid crystal display element according to claim 1, wherein holes arranged in a row are formed in the polyimide of the bent portion.
分よりも狭くしたことを特徴とする請求項１記載の液晶
表示素子。(3) The liquid crystal display element according to claim 1, wherein the pattern width of the copper foil pattern at the bent portion is narrower than that at other portions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30506290A JPH04177222A (en) | 1990-11-09 | 1990-11-09 | Liquid crystal display element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30506290A JPH04177222A (en) | 1990-11-09 | 1990-11-09 | Liquid crystal display element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04177222A true JPH04177222A (en) | 1992-06-24 |
Family
ID=17940662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30506290A Pending JPH04177222A (en) | 1990-11-09 | 1990-11-09 | Liquid crystal display element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04177222A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442470A (en) * | 1992-03-26 | 1995-08-15 | Seiko Epson Corporation | Liquid crystal device having frame member and electronic apparatus using the same |
| KR100443839B1 (en) * | 1997-11-01 | 2004-12-29 | 엘지.필립스 엘시디 주식회사 | Flexible Printed Circuit |
-
1990
- 1990-11-09 JP JP30506290A patent/JPH04177222A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442470A (en) * | 1992-03-26 | 1995-08-15 | Seiko Epson Corporation | Liquid crystal device having frame member and electronic apparatus using the same |
| KR100443839B1 (en) * | 1997-11-01 | 2004-12-29 | 엘지.필립스 엘시디 주식회사 | Flexible Printed Circuit |
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