WO1990000264A1 - Liquid crystal cell - Google Patents

Liquid crystal cell Download PDF

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Publication number
WO1990000264A1
WO1990000264A1 PCT/EP1989/000723 EP8900723W WO9000264A1 WO 1990000264 A1 WO1990000264 A1 WO 1990000264A1 EP 8900723 W EP8900723 W EP 8900723W WO 9000264 A1 WO9000264 A1 WO 9000264A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
substrate
crystal cell
substrates
rigid substrate
Prior art date
Application number
PCT/EP1989/000723
Other languages
German (de)
French (fr)
Inventor
Stefan Brosig
Original Assignee
Nokia Unterhaltungselektronik (Deutschland) Gmbh
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 Nokia Unterhaltungselektronik (Deutschland) Gmbh filed Critical Nokia Unterhaltungselektronik (Deutschland) Gmbh
Publication of WO1990000264A1 publication Critical patent/WO1990000264A1/en

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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
    • G02F1/133305—Flexible substrates, e.g. plastics, organic film
    • 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
    • G02F1/133302—Rigid substrates, e.g. inorganic substrates
    • 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
    • G02F1/1339—Gaskets; Spacers; Sealing of cells
    • G02F1/13392—Gaskets; Spacers; Sealing of cells spacers dispersed on the cell substrate, e.g. spherical particles, microfibres

Definitions

  • the invention relates to a liquid crystal cell according to the preamble of claim 1.
  • liquid crystal cells which are as thin as possible with a uniform layer thickness are required to improve the properties.
  • a disadvantage of such a liquid crystal cell is that the cell as a whole can be deformed by external force and is therefore only of limited use.
  • Liquid crystals of such liquid crystal cells have considerable differences in thickness, since the surfaces of the carrier plates are provided with elevations and depressions. Elevations of the two carrier plates that face each other determine the minimum distance between the two carrier plates. The distance between two opposing recesses, on the other hand, is considerably larger, which results in a larger one
  • Carrier plates are placed.
  • the invention has for its object to provide light, thin and mechanically stable liquid crystal cells with a constant thickness of the liquid crystal.
  • Substrate with large surface roughness can be used without affecting the thickness of the liquid crystal.
  • Liquid crystal cell 1 schematically in section
  • a liquid crystal 2 and uniformly distributed spacer elements 3 are arranged between a rigid substrate 4 and a flexible substrate 5.
  • the two substrates 4, 5 are glued together at the edge.
  • the rigid substrate 4 has a thickness in the range from 0.5 to 1.5 mm and consists of float glass, the surface roughness of which has a depth in the range of ⁇ 0.2 micrometers over a width in the range of 2 cm. Rigid substrates 4 with a smoother glass or plastic surface can also be used.
  • the liquid crystal cell can be used for both
  • Liquid crystal displays as well as light valves can be used for optical printers.
  • the flexible substrate 5 is thinner than the rigid one
  • Substrate 4 it has a thickness of 0.1 mm and has a shallow surface roughness.
  • the flexible substrate 5 can also be made from a film of a
  • organic polymer exist.
  • the flexible substrate fits through the
  • the flexibility of the flexible substrate 5 must be designed such that the substrate adapts to the unevenness of the rigid substrate 4, but does not adapt to the support points of the spacer elements
  • the rigid substrate 4 imparts the mechanical strength to the liquid crystal cell 1, so that the liquid crystal cell is not deformed by external pressure on the rigid substrate 5 and thus no negative effect on the liquid crystal can occur.
  • the device according to the invention is particularly suitable for liquid crystal cells with a liquid crystal of the TN (twisted nematic) type.
  • the liquid crystals are particularly suitable for liquid crystal cells with a liquid crystal of the TN (twisted nematic) type.
  • Such cells have a thickness in the range of 10 micrometers or less.
  • Liquid crystal thickness is ⁇ 0.2 microns.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

A liquid crystal cell (1) has a rigid substrate (4) and a flexible substrate (5). The liquid crystal (2) and the spacer elements (3) are arranged between the substrates (4, 5). The flexible substrate (5) can be adapted by means of the spacer elements (3) to the rigid substrate (4), so that the liquid crystal (2) has a constant thickness even when the surface roughness of the rigid substrate (4) is very deep. It can therefore also be used with a liquid crystal (2) having as its rigid substrate (4) only a very thin layer of cheap float glass.

Description

Beschreibung  description
Flüssigkristallzelle Liquid crystal cell
Die Erfindung betrifft eine Flüssigkristallzelle gemäß dem Oberbegriff des Anspruchs 1. The invention relates to a liquid crystal cell according to the preamble of claim 1.
Die technische Entwicklung von Flüssigkristallzellen geht dahin, daß zur Verbesserung der Eigenschaften möglichst dünne Flüssigkristalle mit gleichförmiger Schichtdicke gefordert werden. The technical development of liquid crystal cells is that liquid crystals which are as thin as possible with a uniform layer thickness are required to improve the properties.
Aus der DE 34 21 723 A1 ist bekannt, für dünne und leichte Flüssigkristallzellen dünne Glasplättchen oder Kunststoffolien als Substrate zu verwenden. Der From DE 34 21 723 A1 it is known to use thin glass plates or plastic films as substrates for thin and light liquid crystal cells. The
konstante Abstand zwischen den Substraten wird durch die Anordnung von gleichmäßig verteilten Distanzelementen erreicht. Dabei wird darauf hingewiesen, daß die constant distance between the substrates is achieved by the arrangement of evenly distributed spacer elements. It is pointed out that the
mechanische Festigkeit von Glassubstraten mit mechanical strength of glass substrates with
abnehmender Dicke nachläßt und daß die Verwendung von dünnen Glassubstraten für Flüssigkristallzellen mit hoher Qualitätsanforderung schwierig ist. Es wird in der Schrift daher vorgeschlagen, zwei flexible Folien aus organischen Polymeren als Substrate zu verwenden. decreases in thickness and that the use of thin glass substrates for liquid crystal cells with high quality requirements is difficult. It will be in the Scripture therefore proposed to use two flexible films made of organic polymers as substrates.
Nachteilig bei einer solchen Flüssigkristallzelle ist, daß die Zelle als ganzes durch äußere Kraft verformbar und somit nur beschränkt verwendungsfähig ist. A disadvantage of such a liquid crystal cell is that the cell as a whole can be deformed by external force and is therefore only of limited use.
In der DE 34 23 847 A1 ist eine Flüssigkristallzelle mit zwei planparallelen Trägerplatten versehen. Die In DE 34 23 847 A1, a liquid crystal cell is provided with two plane-parallel carrier plates. The
Flüssigkristalle derartiger Flüssigkristallzellen weisen erhebliche Dickenunterschiede auf, da die Oberflächen der Trägerplatten mit Erhebungen und Vertiefungen versehen sind. Erhebungen der beiden Trägerplatten, die sich gegenüberstehen, bestimmen den Mindestabstand zwischen den beiden Trägerplatten. Der Abstand zwischen zwei gegenüberliegenden Vertiefungen ist dagegen wesentlich größer, wodurch sich ein großer Liquid crystals of such liquid crystal cells have considerable differences in thickness, since the surfaces of the carrier plates are provided with elevations and depressions. Elevations of the two carrier plates that face each other determine the minimum distance between the two carrier plates. The distance between two opposing recesses, on the other hand, is considerably larger, which results in a larger one
Dicken unterschied des Flüssigkristalls ergibt. Derartige Flüssigkristallzellen können daher nur verwendet werden, wenn die Dicke der Flüssigkristalle eine hohe To l e r a nz zuläßt, oder es müssen sehr hohe Anforderungen an die Planarität und die Oberflächenrauhigkeit der Thickness difference of the liquid crystal results. Such liquid crystal cells can therefore only be used if the thickness of the liquid crystals allows a high tolerance, or there must be very high demands on the planarity and the surface roughness of the
Trägerplatten gestellt werden. Carrier plates are placed.
Der Erfindung liegt die Aufgabe zugrunde, leichte, dünne und mechanisch stabile Flüssigkristallzellen mit möglichst konstanter Dicke des Flüssigkristalls zu schaffen. The invention has for its object to provide light, thin and mechanically stable liquid crystal cells with a constant thickness of the liquid crystal.
Die Aufgabe wird bei einer gattungsgemäßen Anordnung durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Weitere Ausgestaltungen der Erfindung sind den übrigen Ansprüchen zu entnehmen. The object is achieved in a generic arrangement by the characterizing features of claim 1. Further refinements of the invention can be found in the remaining claims.
Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß als starres Substrat ein The advantages achieved by the invention are, in particular, that as a rigid substrate
Substrat mit großer Oberflachenrauhigkeit verwendet werden kann, ohne daß sich dies auf die Dicke des Flüssigkristalles auswirkt.  Substrate with large surface roughness can be used without affecting the thickness of the liquid crystal.
Ausführungsbeispiele der Erfindung werden im folgenden unter Bezug auf die Figur beschrieben. Embodiments of the invention are described below with reference to the figure.
In der Figur ist ein Ausschnitt einer In the figure is a section of one
Flüssigkristallzelle 1 schematisch im Schnitt  Liquid crystal cell 1 schematically in section
abgebildet. Zwischen einem starren Substrat 4 und einem flexiblen Substrat 5 sind ein Flüssigkristall 2 und gleichmäßig verteilte Distanzelemente 3 angeordnet. Die beiden Substrate 4, 5 sind am Rande miteinander verklebt. Das starre Substrat 4 hat eine Dicke im Bereich von 0,5 bis 1,5 mm und besteht aus Floatglas, dessen Oberflächenrauhigkeit eine Tiefe im Bereich von ± 0,2 Mikrometern auf einer Breite im Bereich von 2 cm aufweist. Es können auch starre Substrate 4 mit einer glatteren Oberfläche aus Glas oder Kunststoff verwendet werden. pictured. A liquid crystal 2 and uniformly distributed spacer elements 3 are arranged between a rigid substrate 4 and a flexible substrate 5. The two substrates 4, 5 are glued together at the edge. The rigid substrate 4 has a thickness in the range from 0.5 to 1.5 mm and consists of float glass, the surface roughness of which has a depth in the range of ± 0.2 micrometers over a width in the range of 2 cm. Rigid substrates 4 with a smoother glass or plastic surface can also be used.
Zur einfacheren und klareren Darstellung der Erfindung sind selbstverständlich notwendige Merkmale, wie transparente Elektroden, Polarisationsfilter, For simpler and clearer presentation of the invention, of course, necessary features such as transparent electrodes, polarization filters,
Orientierungs- und Isolationsschichten in der Figur nicht abgebildet und auch nicht näher beschrieben. Orientation and insulation layers not shown in the figure and also not described in detail.
Die Flüssigkristallzelle kann sowohl für The liquid crystal cell can be used for both
Flüssigkristallanzeigen als auch Lichtventile für optische Drucker verwendet werden. Das flexible Substrat 5 ist dünner als das starre Liquid crystal displays as well as light valves can be used for optical printers. The flexible substrate 5 is thinner than the rigid one
Substrat 4, es hat eine Dicke von 0,1 mm und weist eine Oberflächenrauhigkeit geringer Tiefe auf. Das flexible Substrat 5 kann auch aus einer Folie aus einem Substrate 4, it has a thickness of 0.1 mm and has a shallow surface roughness. The flexible substrate 5 can also be made from a film of a
organischen Polymer bestehen. organic polymer exist.
Das flexible Substrat paßt sich durch den The flexible substrate fits through the
Flüssgikristall 2 und die Distanzelemente 3 vom starren Substrat 5 getrennt elastisch an die Oberflächenstruktur des starren Substrats 5 an. Liquid crystal 2 and the spacer elements 3 separated from the rigid substrate 5 elastically on the surface structure of the rigid substrate 5.
Die Flexibilität des flexiblen Substrats 5 muß derart ausgebildet sein, daß sich das Substrat zwar an die Unebenheiten des starren Substrats 4 anpaßt, sich aber nicht an den Auflagepunkten der Distanzelemente The flexibility of the flexible substrate 5 must be designed such that the substrate adapts to the unevenness of the rigid substrate 4, but does not adapt to the support points of the spacer elements
verformt. deformed.
Unebenheiten des s t a r r e n Substrats 5 führen dadurch nicht zu einer inhomogenen Dicke des Flüssigkristalls 2, wie dies der Fall ist, wenn beide Substrate starr ausgebildet sind. As a result, unevenness in the substrate 5 does not lead to an inhomogeneous thickness of the liquid crystal 2, as is the case when both substrates are rigid.
Das starre Substrat 4 verleiht der Flüssigkristallzelle 1 die mechanische Festigkeit, so daß sich durch äußeren Druck auf das starre Substrat 5 die Flüssigkristallzelle nicht verformt und somit keine negative Wirkung auf den Flüssigkristall auftreten kann. The rigid substrate 4 imparts the mechanical strength to the liquid crystal cell 1, so that the liquid crystal cell is not deformed by external pressure on the rigid substrate 5 and thus no negative effect on the liquid crystal can occur.
Die erfindungsgemäße Vorrichtung eignet sich besonders für Flüssigkristallzellen mit einem Flüssigkristall vom Typ TN (Twisted Nematic). Die Flüssigkristalle The device according to the invention is particularly suitable for liquid crystal cells with a liquid crystal of the TN (twisted nematic) type. The liquid crystals
derartiger Zellen weisen eine Dicke im Bereich von 10 Mikrometern oder weniger auf. Die Toleranz der such cells have a thickness in the range of 10 micrometers or less. The tolerance of
Flüssigkristalldicke beträgt ± 0,2 Mikrometer. Liquid crystal thickness is ± 0.2 microns.

Claims

Patentansprüche Claims
1. Flüssigkristallzelle, die zwei Substrate, einen zwischen den Substraten angeordneten Flüssigkristall und in dem Flüssigkristall eingebettete Distanzelemente aufweist, d a d u r c h 1. Liquid crystal cell which has two substrates, a liquid crystal arranged between the substrates and spacer elements embedded in the liquid crystal, d a d u r c h
g e k e n n z e i c h n e t , daß das eine Substrat ein starres Substrat (4) und das andere Substrat ein It is a fact that one substrate is a rigid substrate (4) and the other substrate
flexibles Substrat (5) ist. is flexible substrate (5).
2. Flüssigkristallzelle nach Anspruch 1, dadurch gekennzeichnet, daß das starre Substrat (4) eine 2. Liquid crystal cell according to claim 1, characterized in that the rigid substrate (4)
Oberflächenrauhigkeit mit einer Tiefe im Bereich der maximal zulässigen Toleranz des Abstandes zwischen den beiden Substraten (4, 5) aufweist.  Surface roughness with a depth in the range of the maximum allowable tolerance of the distance between the two substrates (4, 5).
3. Flüssigkristallzelle nach Anspruch 2, dadurch gekennzeichnet, daß der Abstand zwischen den beiden Substraten (4, 5) kleiner als 10 Mikrometer ist und eine Toleranz kleiner als ± 0,2 Mikrometer aufweist. 3. Liquid crystal cell according to claim 2, characterized in that the distance between the two substrates (4, 5) is less than 10 microns and has a tolerance less than ± 0.2 microns.
4. Flüssigkristallzelle nach Anspruch 1, dadurch gekennzeichnet, daß das starre Substrat Floatglas ist. 4. Liquid crystal cell according to claim 1, characterized in that the rigid substrate is float glass.
5. Flüssigkristallzelle nach Anspruch 1, dadurch gekennzeichnet, daß das flexible Substrat (5) eine organische Folie ist. 5. Liquid crystal cell according to claim 1, characterized in that the flexible substrate (5) is an organic film.
6. Flüssigkristallzelle nach Anspruch 1, dadurch gekennzeichnet, daß das flexible Substrat (5) ein Glassubstrat mit einer Dicke im Bereich von 0,1 mm ist 6. Liquid crystal cell according to claim 1, characterized in that the flexible substrate (5) is a glass substrate with a thickness in the range of 0.1 mm
PCT/EP1989/000723 1988-06-29 1989-06-27 Liquid crystal cell WO1990000264A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3821818A DE3821818A1 (en) 1988-06-29 1988-06-29 Liquid-crystal cell
DEP3821818.6 1988-06-29

Publications (1)

Publication Number Publication Date
WO1990000264A1 true WO1990000264A1 (en) 1990-01-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1989/000723 WO1990000264A1 (en) 1988-06-29 1989-06-27 Liquid crystal cell

Country Status (2)

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DE (1) DE3821818A1 (en)
WO (1) WO1990000264A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0528397A2 (en) * 1991-08-19 1993-02-24 Matsushita Electric Industrial Co., Ltd. Ferroelectric liquid crystal panel and method of manufacturing same
WO1998013722A1 (en) * 1996-09-25 1998-04-02 Hoechst Celanese Corporation Liquid crystal display devices using a polymeric support layer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2569280A1 (en) * 1984-08-20 1986-02-21 Canon Kk LIQUID CRYSTAL CELL
JPS6336224A (en) * 1986-07-31 1988-02-16 Victor Co Of Japan Ltd Liquid crystal display element

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2569280A1 (en) * 1984-08-20 1986-02-21 Canon Kk LIQUID CRYSTAL CELL
JPS6336224A (en) * 1986-07-31 1988-02-16 Victor Co Of Japan Ltd Liquid crystal display element

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0528397A2 (en) * 1991-08-19 1993-02-24 Matsushita Electric Industrial Co., Ltd. Ferroelectric liquid crystal panel and method of manufacturing same
EP0528397A3 (en) * 1991-08-19 1993-12-22 Matsushita Electric Ind Co Ltd Ferroelectric liquid crystal panel and method of manufacturing same
US5307190A (en) * 1991-08-19 1994-04-26 Matsushita Electric Industrial Co., Ltd. Ferroelectric liquid crystal panel and method of manufacturing same
WO1998013722A1 (en) * 1996-09-25 1998-04-02 Hoechst Celanese Corporation Liquid crystal display devices using a polymeric support layer

Also Published As

Publication number Publication date
DE3821818A1 (en) 1990-02-08

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