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DE4231390A1 - Ferroelectric liquid crystal display device - uses optical device to control rotation of polarisation plane of transmitted light to improve contrast characteristics - Google Patents

Ferroelectric liquid crystal display device - uses optical device to control rotation of polarisation plane of transmitted light to improve contrast characteristics

Info

Publication number
DE4231390A1
DE4231390A1 DE19924231390 DE4231390A DE4231390A1 DE 4231390 A1 DE4231390 A1 DE 4231390A1 DE 19924231390 DE19924231390 DE 19924231390 DE 4231390 A DE4231390 A DE 4231390A DE 4231390 A1 DE4231390 A1 DE 4231390A1
Authority
DE
Germany
Prior art keywords
liquid crystal
display device
crystal cell
ferroelectric liquid
polarisation plane
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.)
Withdrawn
Application number
DE19924231390
Other languages
German (de)
Inventor
Gernot Dr Schauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs 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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19924231390 priority Critical patent/DE4231390A1/en
Publication of DE4231390A1 publication Critical patent/DE4231390A1/en
Withdrawn legal-status Critical Current

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
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells
    • 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
    • G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell

Landscapes

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

Abstract

The display device has a ferroelectric liquid crystal cell (1) and at least two linear polarisers, the polarisation plane of the transmitted light rotated via at least one optical device inserted between the liquid crystal cell and one of the linear polarisers. Pref. the polarisation plane is rotated via an electrically-controlled liquid crystal cell (2) with homeotropic alignment of the liquid crystal material with a negative anisotropy. The ferroelectric liquid crystal cell pref. has a matrix control. The polarisation plane is rotated in dependence on the temp. ADVANTAGE - Improved image contrast at different ambient temps.

Description

Die vorliegende Erfindung betrifft eine Anzeigevorrichtung nach dem Oberbegriff des Patentanspruchs 1.The present invention relates to a display device according to the preamble of claim 1.

Es ist bekannt, daß man bei Verwendung von ferroelektri­ schen Flüssigkristallmaterialien in Flüssigkristall-Anzei­ gezellen zu verkürzten Schaltzeiten gelangt. Sie sind da­ her geeignet zur Darstellung sich schnell ändernder Zei­ chen oder Bilder.It is known that when using ferroelectric liquid crystal materials in liquid crystal display cell shortened switching times. You are there suitable for displaying rapidly changing times chen or pictures.

Ein Nachteil solcher ferroelektrischer Flüssigkristall-An­ zeigezellen besteht in ihrer verhältnismäßig großen Tempe­ raturempfindlichkeit. So ändert sich z. B. der sogenannte Tiltwinkel und seine Ausrichtung zu den Polarisatoren stark mit der Temperatur, was sich als unerwünschte temperaturabhängige Kontraständerung bemerkbar macht.A disadvantage of such ferroelectric liquid crystal devices Show cells are in their relatively large tempe sensitivity to temperature. So changes z. B. the so-called Tilt angle and its orientation to the polarizers  strongly with temperature, which turns out to be undesirable temperature-dependent change in contrast.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde eine Anzeigevorrichtung der eingangs genannten Art bezüglich des Kontrastverhaltens bei unterschiedlichen Temperaturen zu verbessern.The present invention is based on the object Display device of the type mentioned at the beginning the contrast behavior at different temperatures to improve.

Diese Aufgabe wird durch die im Kennzeichen des Pa­ tentanspruchs 1 angegebenen Merkmale gelöst.This task is carried out by the Pa Features specified 1 solved.

Durch Einfügen eines Polarisators mit einstellbarer Dre­ hung der Polarisationsebene in den Strahlengang benachbart zu der ferroelektrischen Flüssigkristallzelle ist es mög­ lich die Polarisationsebene temperaturabhängig zu verdre­ hen und somit die Ausrichtung bezüglich des Tiltwinkels der ferroelektrischen FK-Zelle zu optimieren. Damit ist es aber möglich, die Kontrastabhängigkeit von der Umgebungs­ temperatur zu verringern.By inserting a polarizer with adjustable Dre hung adjacent to the polarization plane in the beam path it is possible to the ferroelectric liquid crystal cell Lich to twist the polarization plane depending on the temperature hen and thus the alignment with respect to the tilt angle to optimize the ferroelectric LC cell. So that's it but possible the contrast dependence on the environment reduce temperature.

Anhand des in der Figur schematisch dargestellten Quer­ schnitts eines Ausführungsbeispiels wird die Erfindung nachfolgend näher erläutert.Using the cross shown schematically in the figure Section of an embodiment of the invention explained in more detail below.

Mit 1 ist eine ferroelektrische FK-Matrixzelle bezeichnet, die z. B. zwischen zwei Linearpolarisatoren 3 und 4 ange­ ordnet ist. Das ferroelektrische FK-Material 5 befindet sich zwischen zwei transparenten Deckplatten 6 und 7 die auf ihren inneren Oberflächen die zueinander gekreuzt an­ geordneten Elektrodenscharen 8 und 9 zur Ermöglichung ei­ ner Matrixansteuerung aufweisen. Die beiden Deckplatten 6 und 7 sind mittels eines Kleberandes 10 das ferroelektri­ sche FK-Material 5 einschließend dicht miteinander verbun­ den. 1 with a ferroelectric LC matrix cell is designated, the z. B. is arranged between two linear polarizers 3 and 4 . The ferroelectric LC material 5 is located between two transparent cover plates 6 and 7 which, on their inner surfaces, have crossed electrode assemblies 8 and 9 to enable a matrix control. The two cover plates 6 and 7 are by means of an adhesive edge 10 enclosing the ferroelectric material FK 5 tightly connected to each other.

Gemäß der Erfindung ist eine benachbart zu der ferroelek­ trischen FK-Zelle 1 eine weitere FK-Zelle 2 vorgesehen, die als Polarisator mit veränderbarer Drehung der Polari­ sationsebene wirkt. Der Drehwinkel der Polarisationsebene des hindurchtretenden Lichtes läßt sich in Abhängigkeit von der an dieser FK-Zelle 2 anliegenden elektrischen Größe, z. B. der Spannung verändern.According to the invention, a further FK cell 2 is provided adjacent to the ferroelectrical LC cell 1 , which acts as a polarizer with a variable rotation of the polarization plane. The angle of rotation of the plane of polarization of the light passing through can be dependent on the electrical quantity applied to this LC cell 2 , e.g. B. change the voltage.

Bei dem dargestellten Ausführungsbeispiel befindet sich die FK-Zelle 2 zwischen dem Polarisator 3 und der ferro­ elektrischen FK-Zelle 1. Die FK-Zelle 2 ist vorzugsweise eine Zelle mit einem sich homöotrop ausrichtenden Flüssig­ kristallmaterial 11 mit negativer Anisotropie. Das FK-Ma­ terial 11 ist zwischen zwei transparenten Deckplatten 12 und 13 bevorzugt aus Glas und den Randverklebungen 16 her­ metisch eingeschlossen.In the exemplary embodiment shown, the LC cell 2 is located between the polarizer 3 and the ferroelectric LC cell 1 . The LC cell 2 is preferably a cell with a homeotropically aligned liquid crystal material 11 with negative anisotropy. The FK-Ma material 11 is between two transparent cover plates 12 and 13 preferably made of glass and the edge bonds 16 metically enclosed.

Auf den Innenflächen der Deckplatten 12 und 13 befinden sich transparente Elektrodenschichten 14 und 15, z. B. so­ genannte ITO-Schichten, wie sie auch für die Elektroden­ scharen 8 und 9 der ferroelektrischen FK-Zelle 1 verwendet sind.On the inner surfaces of the cover plates 12 and 13 there are transparent electrode layers 14 and 15 , for. B. so-called ITO layers, as they are also used for the electrodes 8 and 9 of the ferroelectric LC cell 1 are used.

Die Elektrodenschichten 14 und 15 der FK-Zelle 21 sind bevorzugt unstrukturiert und großflächig. Wenn als FK- Schicht 11 eine solche mit homöotroper Orientierung ver­ wendet wird, so kann z. B. durch Änderung der an den Elek­ trodenschichten 14 und 15 anliegenden Spannung der Dreh­ winkel der Polarisationsebene des hindurchtretenden Lichts verändern. Im Zusammenwirken mit der ferroelektrischen FK- Zelle 41 läßt sich damit eine optimale Kontrastwirkung bei Durchtritt des polarisierten Lichts durch die FK-Zelle er­ zielen.The electrode layers 14 and 15 of the LC cell 21 are preferably unstructured and have a large area. If used as FK layer 11 such with homeotropic orientation ver, z. B. by changing the elec trode layers 14 and 15 applied voltage of the rotation angle of the plane of polarization of the light passing through. In cooperation with the ferroelectric FK cell 41 , he can thus achieve an optimal contrast effect when the polarized light passes through the FK cell.

Claims (5)

1. Anzeigevorrichtung mit einer ferroelektrischen Flüs­ sigkristall-Zelle und wenigstens zwei linearen Polarisato­ ren, dadurch gekennzeichnet, daß zumindest eine optische Vorrichtung zur veränderbaren Drehung der Polarisationsebene des hindurchtretenden Lichts zwischen der ferroelektrischen Flüssigkristallzelle und einem Linearpolarisator angeordnet ist.1. Display device with a ferroelectric liquid crystal cell and at least two linear polarisers, characterized in that at least one optical device for changing the rotation of the polarization plane of the light passing through is arranged between the ferroelectric liquid crystal cell and a linear polarizer. 2. Anzeigevorrichtung nach Anspruch 1, dadurch gekenn­ zeichnet, daß die Vorrichtung zur veränderbaren Drehung der Polarisationsebene eine elektrisch steuerbare Flüssig­ kristall-Zelle ist.2. Display device according to claim 1, characterized records that the variable rotation device an electrically controllable liquid in the plane of polarization is crystal cell. 3. Anzeigevorrichtung nach Anspruch 2, dadurch gekenn­ zeichnet, daß die elektrisch steuerbare Flüssigkristall- Zelle vorzugsweise eine solche mit homöotroper Ausrichtung eines Flüssigkristallmaterials mit negativer Anisotropie ist.3. Display device according to claim 2, characterized records that the electrically controllable liquid crystal  Cell preferably one with homeotropic alignment a liquid crystal material with negative anisotropy is. 4. Anzeigevorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die ferroelektrische Flüssig­ kristallzelle eine solche mit Matrixansteuerung ist.4. Display device according to one of claims 1 to 3, characterized in that the ferroelectric liquid crystal cell is one with matrix control. 5. Anzeigevorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Drehung der Polarisations­ ebene des einstellbaren Polarisators in Abhängigkeit von der Temperatur vorgenommen wird.5. Display device according to one of claims 1 to 4, characterized in that the rotation of the polarizations level of the adjustable polarizer depending on the temperature is made.
DE19924231390 1992-09-19 1992-09-19 Ferroelectric liquid crystal display device - uses optical device to control rotation of polarisation plane of transmitted light to improve contrast characteristics Withdrawn DE4231390A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19924231390 DE4231390A1 (en) 1992-09-19 1992-09-19 Ferroelectric liquid crystal display device - uses optical device to control rotation of polarisation plane of transmitted light to improve contrast characteristics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19924231390 DE4231390A1 (en) 1992-09-19 1992-09-19 Ferroelectric liquid crystal display device - uses optical device to control rotation of polarisation plane of transmitted light to improve contrast characteristics

Publications (1)

Publication Number Publication Date
DE4231390A1 true DE4231390A1 (en) 1994-03-24

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996010210A1 (en) * 1994-09-29 1996-04-04 Optikzentrum Nrw Gmbh (Oz) Achromatic phase lagging component and process for producing the same
CN120428472A (en) * 2025-07-07 2025-08-05 东莞明崴电子科技有限公司 An LCM liquid crystal display module and its display screen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3036578A1 (en) * 1980-09-27 1982-05-13 Blaupunkt-Werke Gmbh, 3200 Hildesheim Liquid crystal display - has second electrode and liquid crystal element to improve display quality
EP0100112A1 (en) * 1982-07-13 1984-02-08 BBC Aktiengesellschaft Brown, Boveri & Cie. Liquid crystal display device
DE3911620A1 (en) * 1989-04-08 1990-10-18 Merck Patent Gmbh Electro=optical LCD system using ECB principle - uses conventional liquid crystal layer and non-controllable liquid crystal addition
DE3925382A1 (en) * 1989-06-14 1991-01-03 Merck Patent Gmbh ELECTROOPTIC SYSTEM WITH COMPENSATION FILM

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3036578A1 (en) * 1980-09-27 1982-05-13 Blaupunkt-Werke Gmbh, 3200 Hildesheim Liquid crystal display - has second electrode and liquid crystal element to improve display quality
EP0100112A1 (en) * 1982-07-13 1984-02-08 BBC Aktiengesellschaft Brown, Boveri & Cie. Liquid crystal display device
DE3911620A1 (en) * 1989-04-08 1990-10-18 Merck Patent Gmbh Electro=optical LCD system using ECB principle - uses conventional liquid crystal layer and non-controllable liquid crystal addition
DE3925382A1 (en) * 1989-06-14 1991-01-03 Merck Patent Gmbh ELECTROOPTIC SYSTEM WITH COMPENSATION FILM

Non-Patent Citations (11)

* Cited by examiner, † Cited by third party
Title
1-177019 A. P -944,Oct. 13, 1989,Vol.13,No.454 *
2- 29629 A. P-1034,Apr. 10, 1990,Vol.14,No.179 *
3-116015 A. P-1238,Aug. 15, 1991,Vol.15,No.320 *
3-185421 A. P-1273,Nov. 8, 1991,Vol.15,No.439 *
3-188419 A. P-1275,Nov. 14, 1991,Vol.15,No.449 *
3-197924 A. P-1279,Nov. 22, 1991,Vol.15,No.462 *
3-200212 A. P-1281,Nov. 27, 1991,Vol.15,No.469 *
4- 1722 A. P-1335,April 9, 1992,Vol.16,No.143 *
63- 44634 A. P- 732,July 19, 1988,Vol.12,No.255 *
MATSUMOTO,S. et.al.: Large-area video-rate multicolor ferroelectric LCD. In: Proceedings of the SID, Vol.29/4,1988,S.255-258 *
Patents Abstracts of Japan: 62-235932 A. P -684,April 5, 1988,Vol.12,No.102 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996010210A1 (en) * 1994-09-29 1996-04-04 Optikzentrum Nrw Gmbh (Oz) Achromatic phase lagging component and process for producing the same
CN120428472A (en) * 2025-07-07 2025-08-05 东莞明崴电子科技有限公司 An LCM liquid crystal display module and its display screen
CN120428472B (en) * 2025-07-07 2025-09-19 东莞明崴电子科技有限公司 An LCM liquid crystal display module and its display screen

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