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WO1999006885A1 - Dispositif d'affichage a cristaux liquides pouvant etre chauffe - Google Patents

Dispositif d'affichage a cristaux liquides pouvant etre chauffe Download PDF

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Publication number
WO1999006885A1
WO1999006885A1 PCT/DE1998/001956 DE9801956W WO9906885A1 WO 1999006885 A1 WO1999006885 A1 WO 1999006885A1 DE 9801956 W DE9801956 W DE 9801956W WO 9906885 A1 WO9906885 A1 WO 9906885A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
layer
display device
crystal display
transparent
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.)
Ceased
Application number
PCT/DE1998/001956
Other languages
German (de)
English (en)
Inventor
Andreas Weippert
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to DE29823400U priority Critical patent/DE29823400U1/de
Publication of WO1999006885A1 publication Critical patent/WO1999006885A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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

Definitions

  • the invention relates to a liquid crystal display device of the type specified in the preamble of claim 1, and in particular to a liquid crystal display device for motor vehicles.
  • Liquid crystal displays double layer supertwisted nematic react very slowly at low temperatures. Since a DSTN-LCD consists of two individual cells lying on top of each other, another problem lies in creating an approximately equal temperature in the liquid crystal layers of the two cells. This is particularly difficult to achieve if the heating results from a spaced apart component.
  • a liquid crystal display device is known from the Japanese patent application Publication No. 1-204024 (Patents Abstracts of Japan, P-959, November 14, 1989, Vol. 13 / No. 505).
  • a temperature compensation layer for heating or cooling the display device is arranged between the substrates of two liquid crystal cells.
  • the temperature compensation layer has a structure with a cavity.
  • the transparent carrier layers between the liquid crystal layers must be processed on the two large sides. In terms of process technology, it is very difficult to avoid contamination on one of the two sides.
  • US Pat. No. 4,952,783 discloses a translucent, flexible heating plate which is fastened behind a conventional liquid crystal display device. An additional component must therefore be produced as a heater and attached to the liquid crystal display device.
  • the heating layer can consist of the same material as the control electrodes.
  • the transparent heating layer can be applied directly to one side of an already existing transparent carrier layer.
  • 1 shows the schematic structure of a DSTN
  • Liquid crystal display with a heating layer Liquid crystal display with a heating layer
  • FIG. 2 shows a perspective view of a DSTN
  • Figure 3 is a side view of the liquid crystal display of
  • FIG. 1 shows a DSTN liquid crystal display with a controllable or active liquid crystal layer 1, which consists of a multiplicity of liquid crystal molecules, and a passive liquid crystal layer 5, for which no electrodes are provided.
  • the controllable liquid crystal layer 1 is embedded between two transparent carrier layers 3.
  • the transparent carrier layers 3 are substrates made of glass.
  • the sides of the transparent carrier layers 3 facing the liquid crystal layer 1 are covered by transparent electrodes 2, which are provided with an orientation layer.
  • the transparent electrodes 2 control the liquid crystal layer 1 and thus cause a display.
  • the passive liquid crystal layer 5 is likewise embedded between two carrier layers 3, which results in four carrier layers 3 in this example.
  • the transparent carrier layers 3, which embed the passive liquid crystal layer 5, have only an orientation layer 7 on their sides facing the liquid crystal layer 5 instead of the transparent electrodes 2.
  • the two outer transparent carrier layers 3 each have a layer with a polarizer 6 on their outside.
  • the heating layer 4 is applied to the carrier layer 3 of the passive liquid crystal layer 5, which is arranged in the direction of the active liquid crystal layer 1. This can they cause a relatively uniform heating of both liquid crystal layers.
  • a tin oxide and in particular indium tin oxide (ITO) are suitable as the heating layer.
  • the transparent heating layer 4 By integrating the transparent heating layer 4 in the liquid crystal display device, its size is hardly influenced. When installing in a housing, no additional heating components need to be attached.
  • the heating layer 4 can also be structured so that the two electrical connection contacts (heating layer contacts) for the heating layer 4 can be attached to one side of the liquid crystal display device. In this case, a short circuit must be avoided by means of a gap or a geometric pattern or a special division of the heating layer into zones.
  • the thickness of an indium tin oxide layer can be between 10 nm and 300 nm, and a transmittance of more than 80% can be achieved. A value between 50 nm and 150 nm is particularly suitable for the heating layer. With a display with dimensions of 9 cm x 3 cm, a resistance of the heating layer of 10 ohms can be achieved with this. At low temperatures, such as can occur in winter in motor vehicles that are parked outdoors, a voltage is applied to the heating layer 4. As a result, the carrier layer 3 and the liquid crystal layer 1 are heated. If the liquid crystal layer has reached a temperature of at least 0 ° C, switching times are achieved even at ambient temperatures of -30 ° C, which allow the display of fast image changes, as is necessary, for example, for the display of a telephone number input.
  • An operating current for a heating layer made of indium tin oxide in the range from 0.05A to 0.2A per centimeter width of the heating layer 4 is particularly suitable for generating heat.
  • FIG. 2 shows the spatial shape of a DSTN liquid crystal display according to the invention.
  • the transparent carrier layers 3 provided with the transparent heating layer 4 and the transparent electrodes 2 protrude laterally from the display device in order to form contact areas for control contacts of the transparent electrodes 2 and for heating layer contacts.
  • the carrier layer 3 provided with the heating layer 4 protrudes all around from the outer carrier layer for the passive liquid crystal layer 5. This results in the possibility of producing a particularly large-area contact for the heating layer, via which current can be supplied to and removed from the heating layer.
  • the outer carrier layer of the controllable liquid crystal layer 1 jumps again on one side opposite the inner carrier layer of the active liquid crystal Layer 1 out. This results in a type of stair profile.
  • Figure 4 is a plan view of Figure 3.
  • the contact surfaces 8 are shown, which are used to apply the operating voltage.
  • the longest opposite sides were selected for contacting.
  • the contact sides are selected as a function of the geometry of the heating surface provided by the heating layer 4.
  • a flat contact between an energy supply and the heating layer 4 can be made, for example, by means of a conductive adhesive, an electrically conductive rubber of the type described in the published patent application DE 31 37 864 A1, metal clips or metal pins.

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)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention concerne un dispositif d'affichage à cristaux liquides qui présente une couche de cristaux liquides (1) pouvant être commandée, placée entre deux couches de support transparentes (3), ainsi que des électrodes de commande transparentes (2) sur les côtés des couches de support transparentes (3), opposés à la couche de cristaux liquides (1). Une couche chauffante transparente (4), isolée électriquement, est placée sur une couche de support transparente, parallèlement à celle-ci.
PCT/DE1998/001956 1997-08-01 1998-07-13 Dispositif d'affichage a cristaux liquides pouvant etre chauffe Ceased WO1999006885A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29823400U DE29823400U1 (de) 1997-08-01 1998-07-13 Beheizbare Flüssigkristall-Anzeigeeinrichtung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19733409 1997-08-01
DE19733409.1 1997-08-01

Publications (1)

Publication Number Publication Date
WO1999006885A1 true WO1999006885A1 (fr) 1999-02-11

Family

ID=7837762

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/001956 Ceased WO1999006885A1 (fr) 1997-08-01 1998-07-13 Dispositif d'affichage a cristaux liquides pouvant etre chauffe

Country Status (2)

Country Link
DE (1) DE29823400U1 (fr)
WO (1) WO1999006885A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0915360A3 (fr) * 1997-11-07 2000-01-19 Mannesmann VDO Aktiengesellschaft Dispositif d'affichage
GB2361775A (en) * 2000-01-21 2001-10-31 Hosiden Corp Two-layer LCD with heater
EP1193679A2 (fr) 2000-09-28 2002-04-03 Siemens Aktiengesellschaft Dispositif d'affichage à cristaux liquides, notamment pour un véhicule automobile
KR20020034941A (ko) * 2000-10-31 2002-05-09 존슨 테렌스 레슬리 아이티오 히터
US6678033B1 (en) 1997-11-07 2004-01-13 Mannesmann Vdo Ag Liquid crystal display with heater
CN110045532A (zh) * 2019-04-30 2019-07-23 武汉华星光电技术有限公司 液晶显示面板

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3438756A1 (de) * 1984-10-23 1986-04-24 Borg Instruments GmbH, 7537 Remchingen Doppeldrehzellen-anzeigeeinrichtung
JPH01204024A (ja) * 1988-02-10 1989-08-16 Toshiba Corp 液晶表示装置
US5247374A (en) * 1990-04-05 1993-09-21 Stanley Electric Co., Ltd. Liquid crystal display device with common heater between two cells

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3438756A1 (de) * 1984-10-23 1986-04-24 Borg Instruments GmbH, 7537 Remchingen Doppeldrehzellen-anzeigeeinrichtung
JPH01204024A (ja) * 1988-02-10 1989-08-16 Toshiba Corp 液晶表示装置
US5247374A (en) * 1990-04-05 1993-09-21 Stanley Electric Co., Ltd. Liquid crystal display device with common heater between two cells

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 505 (P - 959) 14 November 1989 (1989-11-14) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6128053A (en) * 1997-10-22 2000-10-03 Mannesmann Vdo Ag Liquid crystal display with heater
US6317178B1 (en) 1997-10-22 2001-11-13 Mannesmann Vdo Ag Liquid crystal display device having active & passive cell wherein a heater is disposed inside the passive cell
EP0915360A3 (fr) * 1997-11-07 2000-01-19 Mannesmann VDO Aktiengesellschaft Dispositif d'affichage
US6678033B1 (en) 1997-11-07 2004-01-13 Mannesmann Vdo Ag Liquid crystal display with heater
GB2361775A (en) * 2000-01-21 2001-10-31 Hosiden Corp Two-layer LCD with heater
GB2361775B (en) * 2000-01-21 2004-01-14 Hosiden Corp Two-layer super-twisted nematic liquid crystal display element
EP1193679A2 (fr) 2000-09-28 2002-04-03 Siemens Aktiengesellschaft Dispositif d'affichage à cristaux liquides, notamment pour un véhicule automobile
EP1193679A3 (fr) * 2000-09-28 2006-02-01 Siemens Aktiengesellschaft Dispositif d'affichage à cristaux liquides, notamment pour un véhicule automobile
KR20020034941A (ko) * 2000-10-31 2002-05-09 존슨 테렌스 레슬리 아이티오 히터
EP1202107A3 (fr) * 2000-10-31 2003-10-01 Varintelligent (Bvi) Limited Un chauffage de ITO
US7023519B2 (en) 2000-10-31 2006-04-04 Varintelligent (Bvi) Limited Internal heater embedded in an LCD cell
CN110045532A (zh) * 2019-04-30 2019-07-23 武汉华星光电技术有限公司 液晶显示面板

Also Published As

Publication number Publication date
DE29823400U1 (de) 1999-05-27

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