JPS63316884A - External circuit connection structure for liquid crystal panel - Google Patents
External circuit connection structure for liquid crystal panelInfo
- Publication number
- JPS63316884A JPS63316884A JP15301587A JP15301587A JPS63316884A JP S63316884 A JPS63316884 A JP S63316884A JP 15301587 A JP15301587 A JP 15301587A JP 15301587 A JP15301587 A JP 15301587A JP S63316884 A JPS63316884 A JP S63316884A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- external circuit
- connection structure
- circuit connection
- phase
- 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
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 35
- 239000005262 ferroelectric liquid crystals (FLCs) Substances 0.000 claims description 25
- 229920005989 resin Polymers 0.000 claims description 20
- 239000011347 resin Substances 0.000 claims description 20
- 239000004990 Smectic liquid crystal Substances 0.000 claims description 12
- 230000005684 electric field Effects 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 8
- 229920001187 thermosetting polymer Polymers 0.000 claims description 6
- 238000010894 electron beam technology Methods 0.000 claims description 5
- 238000010583 slow cooling Methods 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 description 11
- 230000001070 adhesive effect Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 210000002858 crystal cell Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229920002120 photoresistant polymer Polymers 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000012798 spherical particle Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052774 Proactinium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003098 cholesteric effect Effects 0.000 description 1
- 229940114081 cinnamate Drugs 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005621 ferroelectricity Effects 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 230000003189 isokinetic effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002052 molecular layer Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（発明の分野）
本発明は、強誘電性液晶を備えた液晶パネルと外部制御
回路との電気的接続構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to an electrical connection structure between a liquid crystal panel including ferroelectric liquid crystal and an external control circuit.
従来、ＦＰＣ（フレキシブル・プリント基板）と液晶パ
ネル基板とを相互に接続する方法として、絶縁性樹脂中
に導電体粒子を分散含有させたフィルム形状の異方性導
電フィルムを熱圧着して接続する方法が広く知られてい
る。Conventionally, a method for interconnecting FPC (flexible printed circuit board) and liquid crystal panel substrate is to bond an anisotropic conductive film in the form of a film in which conductor particles are dispersed in an insulating resin by thermocompression bonding. The method is widely known.
ところで、近年、クラークらが米国特許第４３６７９２
４号公報などで、メモリー性が付与された強誘電性液晶
素子が発表されている。By the way, in recent years, Clark et al.
Ferroelectric liquid crystal elements with memory properties have been announced in publications such as Publication No. 4.
この強誘電性液晶素子は挿通らが米国特許第４６５５５
６１号公報などで提案したマルチブレクシング駆動によ
る表示パネルに適用することができ、液晶素子による大
画面で高精細なディスプレイが期待されている。This ferroelectric liquid crystal element is disclosed in US Pat. No. 46,555.
The present invention can be applied to display panels driven by multiplexing, such as those proposed in Publication No. 61, and is expected to produce large-screen, high-definition displays using liquid crystal elements.
前述した強誘電性液晶素子は、開田らが米国特許第４６
３９０８９号公報などで明らかにした様に、モノドメイ
ンの配向状態を生じさせる上で、高温側での等方相から
徐冷（５℃／時間程度）することによって、コレステリ
ック相やスメクチックＡ相を通過させてカイラルスメク
チック相を生じさせることを必要としていた。The above-mentioned ferroelectric liquid crystal device was developed by Kaida et al. in U.S. Patent No. 46
As revealed in Publication No. 39089, in order to generate the monodomain orientation state, the cholesteric phase and smectic A phase can be changed by slow cooling (approximately 5°C/hour) from the isotropic phase on the high temperature side. It was necessary to pass it through to generate a chiral smectic phase.
このカイラルスメクチック相までの冷却又は等方相まで
の昇温工程が急激に行われた場合では、モノドメインの
配向状態を形成することができないのが現状である。If the cooling to the chiral smectic phase or the heating to the isotropic phase are performed rapidly, it is currently impossible to form a monodomain orientation state.
従って、この強誘電性液晶を備えた液晶パネルと外部制
御回路とを電気的に接続する際、前述した熱圧着工程を
用いる接続方法では、強誘電性液晶素子が部分又は全体
に亘って急激に加熱され、この熱圧着解除後には加熱さ
れた素子が急冷されるため、カイラルスメクチック相に
復帰した時には、モノドメインの配向状態を生じなくな
る問題点があった。Therefore, when electrically connecting a liquid crystal panel equipped with this ferroelectric liquid crystal to an external control circuit, the above-mentioned connection method using the thermocompression bonding process may cause the ferroelectric liquid crystal element to suddenly partially or completely disintegrate. Since the heated element is rapidly cooled after the thermocompression bond is released, there is a problem in that when the element returns to the chiral smectic phase, the monodomain orientation state no longer occurs.
本発明の目的は、前述の問題点を解消した液晶パネルと
外部制御回路との接続構造、特に強誘電性液晶の配向状
態を乱すことなく、電気的に接続状態の良好な前記接続
構造を提供することにある。An object of the present invention is to provide a connection structure between a liquid crystal panel and an external control circuit that solves the above-mentioned problems, and in particular provides a connection structure that provides good electrical connection without disturbing the alignment state of ferroelectric liquid crystal. It's about doing.
すなわち、本発明は、強誘電性液晶を備えた液晶パネル
の駆動用電極と接続され、且つ該液晶パネルの基板に設
けた外部回路接続用電極と、外部回路と接続され、且つ
基板に設けた外部回路電極との間に導電体粒子を分散含
有した非熱硬化性樹脂で形成した膜の硬化体を配置した
点に特徴を有する液晶パネルの外部回路接続構造である
。That is, the present invention provides an external circuit connecting electrode connected to a driving electrode of a liquid crystal panel including a ferroelectric liquid crystal and provided on a substrate of the liquid crystal panel, and an external circuit connecting electrode connected to an external circuit and provided on the substrate. This external circuit connection structure for a liquid crystal panel is characterized in that a cured film made of a non-thermosetting resin containing conductor particles dispersed therein is disposed between the external circuit electrode and the external circuit electrode.
以下、本発明を実施例に従って説明する。 Hereinafter, the present invention will be explained according to examples.
第１図は、本発明の接続構造の平面図で、第２図はその
断面図である。図示する接続構造で用いた異方性導電接
着剤１１は、導電性粒子を分散含有した硬化性樹脂で形
成したフィルムで、所定の硬化条件（紫外線照射、電子
線照射など）下で硬化体を形成することができる。この
際に用いる導電体粒子としては、Ｎｉ、Ａｕ、Ａｇ、は
んだ等の金属又は合金粒子や樹脂球状粒子にＡｕ、Ｎｉ
等をコーティングした良導電性を有する粒子を用いるこ
とができる。又、この樹脂球状粒子は硬化性樹脂と同程
度の゛線膨張係数のものを用いることができる。この導
電体は、硬化性樹脂の固形分１００重量部に対して０．
５〜５０重量部、好ましくは５〜２０重量部の割合で含
有され、又その平均粒径は５〜５０μｍ、好ましくは１
０〜３０μｍである。FIG. 1 is a plan view of the connection structure of the present invention, and FIG. 2 is a sectional view thereof. The anisotropic conductive adhesive 11 used in the illustrated connection structure is a film formed of a curable resin containing conductive particles dispersed therein. can be formed. The conductive particles used in this case include metal or alloy particles such as Ni, Au, Ag, and solder, and resin spherical particles such as Au, Ni, etc.
Particles having good conductivity coated with the like can be used. Further, the resin spherical particles may have a coefficient of linear expansion comparable to that of the curable resin. This conductor has a content of 0.00 parts by weight based on 100 parts by weight of the solid content of the curable resin.
It is contained in an amount of 5 to 50 parts by weight, preferably 5 to 20 parts by weight, and the average particle size is 5 to 50 μm, preferably 1
It is 0 to 30 μm.
又、本発明で用いる非熱硬化性樹脂としては、一般に用
いられているフォトレジスト樹脂、電子線硬化型フォト
レジスト樹脂を用いることができる。Furthermore, as the non-thermosetting resin used in the present invention, commonly used photoresist resins and electron beam curable photoresist resins can be used.
前述した異方性導電接着剤１１は、液晶パネル１４の基
板１４１上に配線された液晶駆動用電極（例えば走査電
極、信号電極）から引出した外部回路接続用電極１５と
、フィルム・キャリア・テープ１２上に配線した外部回
路電極１３との間に配置され、加圧状態下で所定の硬化
条件下で硬化される。この際、異方性導電接着剤１１が
紫外線硬化性樹脂の時には、紫外線照射装置１７からの
紫外線１７３によって硬化処理を施すことができる。こ
の紫外線照射装置１７は、紫外線ランプ１７２と反射鏡
が備えられている。硬化性樹脂の種類によって異なるが
、一般的にこの際の紫外線強度は、５０ｍＷ／ｃｍ２〜
３００ｍＷ／ ｃ ｍ ２好ましくは１００ｍＷ／ｃｍ
２〜２００ｍ Ｗ ／ ｃ ｍ ’ とするのが好まし
い。又、この紫外線照射装置１７には、赤外線カットフ
ィルター（図示せず）を用いて液晶パネル１４に赤外線
が照射されるのを防ぐことができる。The above-mentioned anisotropic conductive adhesive 11 is attached to the external circuit connection electrode 15 drawn out from the liquid crystal driving electrode (for example, scanning electrode, signal electrode) wired on the substrate 141 of the liquid crystal panel 14, and the film carrier tape. It is placed between the external circuit electrode 13 wired on top of the external circuit electrode 12 and is cured under predetermined curing conditions under pressure. At this time, when the anisotropic conductive adhesive 11 is an ultraviolet curable resin, the curing process can be performed using ultraviolet rays 173 from the ultraviolet irradiation device 17. This ultraviolet irradiation device 17 is equipped with an ultraviolet lamp 172 and a reflecting mirror. Although it varies depending on the type of curable resin, the intensity of ultraviolet rays at this time is generally 50 mW/cm2 ~
300mW/cm2 preferably 100mW/cm
It is preferable to set it as 2-200mW/cm'. Furthermore, an infrared cut filter (not shown) can be used in the ultraviolet irradiation device 17 to prevent the liquid crystal panel 14 from being irradiated with infrared rays.
又、上述の異方性導電接着剤１１は、ペースト状の時に
は印刷等の方法によりコーティングするか、あるいは半
硬化状態のフィルム形状として用いることができる。Further, when the above-mentioned anisotropic conductive adhesive 11 is in the form of a paste, it can be coated by a method such as printing, or it can be used in the form of a semi-cured film.
本発明の具体例では、例えば紫外線硬化エポキシ樹脂の
固形分１００容量部に導電体粒子１０容量部を分散、混
入した導電異方性接着剤に紫外線強度１４０ｍＷ／Ｃｍ
２で１５秒照射したところ、導電異方性接着剤の温度が
約６０℃で、導電異方性接着剤から５ｍｍＩＩＩｉＩれ
た接続部に最も近い強誘電性液晶表示素子の表示部の温
度が室温２３℃から７℃上昇し４０℃に抑えることがで
きた。この結果、強誘電性液晶素子の配向状態に乱れを
生じることがなかった。In a specific example of the present invention, for example, a conductive anisotropic adhesive in which 10 parts by volume of conductive particles are dispersed and mixed into 100 parts by volume of solid content of an ultraviolet curable epoxy resin has an ultraviolet intensity of 140 mW/C.
2, the temperature of the conductive anisotropic adhesive was about 60°C, and the temperature of the display part of the ferroelectric liquid crystal display element closest to the connection part separated by 5 mm from the conductive anisotropic adhesive was room temperature. The temperature rose by 7 degrees Celsius from 23 degrees Celsius, and we were able to keep it to 40 degrees Celsius. As a result, no disturbance occurred in the alignment state of the ferroelectric liquid crystal element.
又、本発明の好ましい具体例では、紫外線又は電子線照
射による接続時にヒートツール２０による加熱処理を伴
用することによフて電気的な接続効果を向上させること
ができる。このヒートツール２０はモリブデンやステン
レスなどの高抵抗の金属又は合金によって成型され、そ
れに加熱電源２０１から電圧５０Ｖ〜５００ Ｖ、好ま
しくは８０ｖ〜２００ｖ１電流０．１Ａ〜ＩＯＡ好まし
くはＩＡ〜５Ａ程度を供給することによって加熱するこ
とができる。この際の加熱時間は数秒程度でよい、又、
かかる加熱処理によって強誘電性液晶が急加熱と急冷が
施されることになるため、配向状態に乱れを生じること
になるため、再配向処理（急冷、急加熱によって生じた
強誘電性液晶の配向の乱れを修復するために、再び強誘
電性液晶を等労相まで加熱した後、徐冷（５℃／時間程
度の冷却）を行なうことによってモノドメインの配向状
態を再調製すること）を施すと、異方性導電接着剤の接
続抵抗の増大を生じることがあるため、再配向時に、前
述した接続部に紫外線照射装置１７より紫外線１７３を
照射することによって、上述した接続抵抗の増大を防止
することがでとる。Further, in a preferred embodiment of the present invention, the electrical connection effect can be improved by using heat treatment using the heat tool 20 when connecting by ultraviolet rays or electron beam irradiation. This heat tool 20 is molded from a high-resistance metal or alloy such as molybdenum or stainless steel, and is supplied with a voltage of 50V to 500V, preferably 80V to 200V, and a current of 0.1A to IOA, preferably IA to 5A, from a heating power source 201. It can be heated by The heating time at this time may be about a few seconds, and
Because the ferroelectric liquid crystal is rapidly heated and cooled by such heat treatment, the alignment state will be disturbed. In order to repair the disorder, the ferroelectric liquid crystal is heated again to the isokinetic phase and then slowly cooled (cooling at about 5°C/hour) to readjust the orientation state of the monodomains. Since this may cause an increase in the connection resistance of the anisotropic conductive adhesive, the above-mentioned connection resistance is prevented from increasing by irradiating the connection portion with ultraviolet rays 173 from the ultraviolet irradiation device 17 during reorientation. I'll figure it out.
上述したフィルム・キャリア・テープ１２に配線した外
部回路電極１３は、外部制御回路として設けたＩＣｌ３
と電気的に接続している。The external circuit electrode 13 wired to the film carrier tape 12 described above is connected to the ICl3 provided as an external control circuit.
is electrically connected to.
又、ＩＣｌ３は、フィルム・キャリア・テープ１２の外
部回路電極１３とボンディング部材１９によって接続さ
れ、その周囲は接着剤１６によフて保護されている。Further, the ICl 3 is connected to the external circuit electrode 13 of the film carrier tape 12 by a bonding member 19, and its periphery is protected by an adhesive 16.
本発明で用いることができる双安定性を有する液晶とし
ては、強誘電性を有するカイラルスメクチック液晶が最
も好ましく、そのうちカイラルスメクチックＣ相（Ｓｍ
Ｃ＊）又はＨ相（ＳｍＨ＊）の液晶が適している。この
強誘電性液晶については、“ル・ジュルナール・ド・フ
ィシツク・レター′″ （Ｌｅ Ｊｏｕｒｎａｌｄｅ
Ｐｈｙｓｉｃ １ｅｔｔｅｒ″）３６ｊＪ（Ｌ−
６９）、１９７５年の「フェロエレクトリック・リキッ
ド・クリスタルＪ （’Ｆｅｒｒ。As the liquid crystal having bistability that can be used in the present invention, chiral smectic liquid crystal having ferroelectricity is most preferable, and among these, chiral smectic C phase (Sm
C*) or H phase (SmH*) liquid crystals are suitable. This ferroelectric liquid crystal is described in “Le Journal de Fissique”.
Physical 1etter'')36jJ(L-
69), 1975's Ferroelectric Liquid Crystal J ('Ferr.
ｅｌｅｃｔｒｉｃ Ｌｉｑｕｉｄ Ｃｒｙｓｔａｌ
Ｓ」）； “アプライド・フィジックス・”レターズ″
（”Ａｐｐｌｉｅｄ ＰｈｙｓｉｃｓＬｅｔｔｅｒ
ｓ” ）３６巻（１１号）、１９８０年の「サブミクロ
ン・セカンド・バイスティプル・エレクトロオプティッ
ク・スイッチング・イン・リキッド・クリスタルＪ
（ｒｓｕｂｍｉｃｒ。electric liquid crystal
S”); “Applied Physics Letters”
(“Applied Physics Letter
s”) Volume 36 (No. 11), 1980 “Submicron Second Bistiple Electro-Optic Switching in Liquid Crystal J”
(rsubmicr.
５ｅｃｏｎｄ Ｂ１５ｔａｂｌｅ Ｅｌｅｃｔｒｏ
ｏｐｔｉｃ Ｓｗｉｔｃｈｉｎｇ １ｎＬｉｑｕｉ
ｄ Ｃｒｙｓｔａｌ」）； “固体物理１６ （１
４１）１９８１ ｒ液晶」、米国特許第４５６１７２６
号公報、米国特許第４５８９９９６号公報、米国特許第
４５９２８５８号公報などに記載されており、本発明で
はこれらに開示された強誘電性液晶を用いることができ
る。5econd B15table Electro
optic Switching 1nLiqui
d Crystal”); “Solid State Physics 16 (1
41) 1981 r liquid crystal”, US Patent No. 4561726
4,589,996, US Pat. No. 4,592,858, etc., and the ferroelectric liquid crystals disclosed in these can be used in the present invention.
より具体的には、本発明法に用いられる強誘電性液晶化
合物の例としては、デシロキシベンジリデン−Ｐ′−ア
ミノ−２−メチルブチルシンナメート（ＤＯＢＡＭＢＣ
）、ヘキシルオキシベンジリデン−Ｐ′−アミノ−２−
クロロプロピルシンナメート（ＨＯＢＡＣＰＣ）および
４−。More specifically, as an example of the ferroelectric liquid crystal compound used in the method of the present invention, decyloxybenzylidene-P'-amino-2-methylbutylcinnamate (DOBAMBC
), hexyloxybenzylidene-P'-amino-2-
Chloropropyl cinnamate (HOBACPC) and 4-.
−（２−メチル）−ブチルレゾルリリデン−４′−オク
チルアニリン（ＭＢＲＡ８）等が挙げられる。Examples include -(2-methyl)-butylresollylidene-4'-octylaniline (MBRA8).
これらの材料を用いて素子を構成する場合、液晶化合物
ＳｍＣ”相又はＳｍＨ＊相となるような温度状態に保持
する為、必要に応じて素子をヒーターが埋め込まれた銅
ブロック等により支持することができる。When constructing an element using these materials, the element must be supported by a copper block with a heater embedded, etc., as necessary, in order to maintain the temperature state such that the liquid crystal compound becomes SmC'' phase or SmH* phase. Can be done.
又、本発明では前述のＳｍＣ＊、ＳｍＨ＊の他に、カイ
ラルスメチックＦ相、■相、Ｊ相、Ｇ相やに相で表わさ
れる強誘電性液晶を用いることも可能である。□
第４図は、強誘電性液晶セルの例を模式的に描いたもの
である。４１ａと４１ｂは、Ｉｎ２Ｏ３゜ＳｎＯ２やＩ
ＴＯ（インジウム−ティン−オキサイド）等の透明電極
がコートされた基板（ガラス板）であり、その間に液晶
分子層４２がガラス面に垂直になるよう配向したＳｍＣ
＊相の液晶が封入されている。太線で示した線４３が液
晶分子を表わしており、この液晶分子４３は、その分子
に直交した方向に双極子モーメント（Ｐ工）４４を有し
ている。基板４１ａと４１ｂ上の電極間に一定の閾値以
上の電圧を印加すると、液晶分子４３のらせん構造がほ
どけ、双極子モーメント（Ｐ上）４４はすべて電界方向
に向くよう、液晶分子４３の配向方向を変えることがで
きる。液晶分子４３は細長い形状を有しており、その長
袖方向と短軸方向で屈折率異方性を示し、従って例えば
ガラス面の上下に互いにクロスニフルの位置関係に配置
した偏光子を置けば、電圧印加極性によって光学特性が
変わる液晶光学変調素子となることは、容易に理解され
る。さらに液晶セルの厚さを十分に薄くした場合（例え
ば１μ）には、第５図に示すように電界を印加していな
い状態でも液晶分子のらせん構造はほどけ、その双極子
モーメントＰａ又はｐｂは上向き（５４ａ）又は下向き
（５４ｂ）のどちらかの状態をとる。Further, in the present invention, in addition to the above-mentioned SmC* and SmH*, it is also possible to use ferroelectric liquid crystals represented by chiral smectic F phase, ■ phase, J phase, G phase, etc. □ Figure 4 schematically depicts an example of a ferroelectric liquid crystal cell. 41a and 41b are In2O3゜SnO2 or I
A substrate (glass plate) coated with a transparent electrode such as TO (indium tin oxide), between which a liquid crystal molecular layer 42 is oriented perpendicular to the glass surface.
* Phase liquid crystal is enclosed. A thick line 43 represents a liquid crystal molecule, and this liquid crystal molecule 43 has a dipole moment (P) 44 in a direction perpendicular to the molecule. When a voltage equal to or higher than a certain threshold is applied between the electrodes on the substrates 41a and 41b, the helical structure of the liquid crystal molecules 43 is unraveled, and the alignment direction of the liquid crystal molecules 43 is changed so that all dipole moments (on P) 44 point in the direction of the electric field. can be changed. The liquid crystal molecules 43 have an elongated shape and exhibit refractive index anisotropy in the long axis direction and the short axis direction. Therefore, for example, if polarizers are placed above and below the glass surface in a cross-niffle positional relationship with each other, the voltage It is easily understood that this results in a liquid crystal optical modulation element whose optical characteristics change depending on the applied polarity. Furthermore, when the thickness of the liquid crystal cell is made sufficiently thin (for example, 1μ), the helical structure of the liquid crystal molecules is unraveled even when no electric field is applied, as shown in Figure 5, and its dipole moment Pa or pb is The state is either upward (54a) or downward (54b).
このようなセルに、第５図に示す如く一定の閾値以上の
極性の異なる電界Ｅａ又はＥｂを所定時間付与すると、
双極子モーメントは電界Ｅａ又はＥｂの電界ベクトルに
対して上向き５４ａ又は下向き５４ｂと向きを変え、そ
れに応じて液晶分子は第１の安定状態５３ａかあるいは
第２の安定状態５３ｂの何れか一方に配向する。When an electric field Ea or Eb of different polarity above a certain threshold value is applied to such a cell for a predetermined period of time as shown in FIG.
The dipole moment changes its direction upward 54a or downward 54b with respect to the electric field vector of the electric field Ea or Eb, and accordingly, the liquid crystal molecules are aligned in either the first stable state 53a or the second stable state 53b. do.
このような強誘電性液晶を光学変調素子とじて用いるこ
との利点は２つある。第１に応答速度が極めて速いこと
、第２に液晶分子の配向が双安定状態を有することであ
る。第２の点を例えば第５図によって説明すると、電界
Ｅａを印加すると液晶分子は第１の安定状態５３ａに配
向するが、この状態は電界を切っても安定である。There are two advantages to using such a ferroelectric liquid crystal as an optical modulation element. Firstly, the response speed is extremely fast, and secondly, the alignment of liquid crystal molecules has a bistable state. The second point will be explained with reference to FIG. 5, for example. When the electric field Ea is applied, the liquid crystal molecules are oriented in a first stable state 53a, and this state remains stable even when the electric field is turned off.
又、逆向きの電界Ｅｂを印加すると液晶分子は第２の安
定状態５３ｂに配向して、その分子の向きを変えるが、
やはり電界を切ってもこの状態に留っている。又、与え
る電界Ｅａが一定の閾値を越えない限り、それぞれの配
向状態にやはり維持されている。このような応答速度の
速さと双安定性が有効に実現されるには、セルとしては
出来るだけ薄い方が好ましく、一般的には０．５μ〜２
０μ、特に１μ〜５μが適している。Moreover, when an electric field Eb in the opposite direction is applied, the liquid crystal molecules are oriented to the second stable state 53b and the orientation of the molecules is changed.
It remains in this state even if the electric field is turned off. Further, as long as the applied electric field Ea does not exceed a certain threshold value, each orientation state is maintained. In order to effectively realize such fast response speed and bistability, it is preferable for the cell to be as thin as possible, and generally the thickness is 0.5μ to 2μ.
0μ, especially 1μ to 5μ is suitable.
以上説明した様に強誘電性液晶表示素子の接続電極とフ
ィルムキャリアテープの接続電極との隙間に紫外線硬化
樹脂、電子線硬化樹脂等の非熱硬化性樹脂中に導電体粒
子を分散、混入した導電異方性接着剤を載置し、フィル
ムキャリアテープ側から加圧するとともに強誘電性液晶
表示素子の接続電極の裏面から紫外線、電子線等を照射
し導電異方性接着剤を硬化させることによって、強誘電
性液晶の相転穆温度以下にプロセス温度を抑えることが
できフィルムキャリアテープの接続工程中に配向孔れを
起こさずに接続することが可能となった。As explained above, conductor particles are dispersed and mixed in a non-thermosetting resin such as an ultraviolet curable resin or an electron beam curable resin in the gap between the connection electrode of the ferroelectric liquid crystal display element and the connection electrode of the film carrier tape. By placing the conductive anisotropic adhesive, applying pressure from the film carrier tape side, and irradiating ultraviolet rays, electron beams, etc. from the back side of the connection electrode of the ferroelectric liquid crystal display element to harden the conductive anisotropic adhesive. The process temperature can be kept below the phase transition temperature of the ferroelectric liquid crystal, and it has become possible to connect the film carrier tape without causing alignment holes during the connection process.
第１図は、本発明の接続構造の平面図で、第２図はその
断面図である。第３図及び第４図は、本発明で用いた強
誘電性液晶素子の斜視図である。FIG. 1 is a plan view of the connection structure of the present invention, and FIG. 2 is a sectional view thereof. 3 and 4 are perspective views of the ferroelectric liquid crystal element used in the present invention.
Claims (6)
接続され、且つ該液晶パネルの基板に設けた外部回路接
続用電極と、外部回路と接続され、且つ基板に設けた外
部回路電極との間に、導電体粒子を分散含有した非熱硬
化性樹脂で形成した膜の硬化体を配置したことを特徴と
する液晶パネルの外部回路接続構造。(1) External circuit connection electrodes connected to drive electrodes of a liquid crystal panel equipped with ferroelectric liquid crystal and provided on the substrate of the liquid crystal panel, and external circuit electrodes connected to an external circuit and provided on the substrate. 1. An external circuit connection structure for a liquid crystal panel, characterized in that a cured film made of a non-thermosetting resin containing conductive particles dispersed therein is disposed between the two.
樹脂である特許請求の範囲第１項記載の外部回路接続構
造。(2) The external circuit connection structure according to claim 1, wherein the non-thermosetting resin is a resin that is cured by ultraviolet irradiation.
樹脂である特許請求の範囲第１項記載の外部回路接続構
造。(3) The external circuit connection structure according to claim 1, wherein the non-thermosetting resin is a resin that is cured by electron beam irradiation.
たカイラルスメクチック相である特許請求の範囲第１項
記載の外部回路接続構造。(4) The external circuit connection structure according to claim 1, wherein the ferroelectric liquid crystal is a chiral smectic phase formed by slow cooling from an isotropic phase.
時カイラルスメクチック相が固有するらせん構造を消失
させる薄さに設定されている特許請求の範囲第４項記載
の外部回路接続構造。(5) The external circuit connection structure according to claim 4, wherein the film thickness of the chiral smectic liquid crystal is set to be thin enough to eliminate the helical structure inherent in the chiral smectic phase in the absence of an electric field.
ックＣ相又はＨ相である特許請求の範囲第４項記載の外
部回路接続構造。(6) The external circuit connection structure according to claim 4, wherein the chiral smectic phase is a chiral smectic C phase or H phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62153015A JP2637431B2 (en) | 1987-06-19 | 1987-06-19 | External circuit connection method for LCD panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62153015A JP2637431B2 (en) | 1987-06-19 | 1987-06-19 | External circuit connection method for LCD panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63316884A true JPS63316884A (en) | 1988-12-26 |
| JP2637431B2 JP2637431B2 (en) | 1997-08-06 |
Family
ID=15553096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62153015A Expired - Fee Related JP2637431B2 (en) | 1987-06-19 | 1987-06-19 | External circuit connection method for LCD panel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2637431B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6285433B1 (en) | 1999-02-24 | 2001-09-04 | Matsushita Electric Industrial Co., Ltd. | Method for mounting TCP film to display panel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60225828A (en) * | 1984-04-24 | 1985-11-11 | Seiko Epson Corp | Packaging method of liquid crystal panel |
| JPS6259922A (en) * | 1985-09-10 | 1987-03-16 | Canon Inc | Ferroelectric liquid crystal element |
-
1987
- 1987-06-19 JP JP62153015A patent/JP2637431B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60225828A (en) * | 1984-04-24 | 1985-11-11 | Seiko Epson Corp | Packaging method of liquid crystal panel |
| JPS6259922A (en) * | 1985-09-10 | 1987-03-16 | Canon Inc | Ferroelectric liquid crystal element |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6285433B1 (en) | 1999-02-24 | 2001-09-04 | Matsushita Electric Industrial Co., Ltd. | Method for mounting TCP film to display panel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2637431B2 (en) | 1997-08-06 |
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