WO1999006885A1 - Heatable liquid crystal display device - Google Patents
Heatable liquid crystal display device Download PDFInfo
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- 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
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- liquid crystal
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- crystal display
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- 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
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- 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.
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- 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
Description
Beschreibungdescription
Beheizbare Flüssigkristall-AnzeigeeinrichtungHeated liquid crystal display device
Die Erfindung betrifft eine Flüssigkristall- Anzeigeeinrichtung der im Oberbegriff des Patentanspruchs 1 angegebenen Art, und insbesondere eine Flüssigkristall- Anzeigeeinrichtung für Kraftfahrzeuge.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.
Die Schaltzeiten von Flüssigkristallzellen einer Flüssigkristallanzeige (LCD) sind bei tiefen Temperaturen aufgrund der temperaturabhängigen Viskosität des Flüssigkristalls so groß, daß die Darstellung eines schnellen Informationswechsels nicht möglich ist. Dies ist für Anwendungen in Kraftfahrzeu- gen besonders nachteilig. Insbesondere sogenannte DSTN-The switching times of liquid crystal cells of a liquid crystal display (LCD) are so long at low temperatures due to the temperature-dependent viscosity of the liquid crystal that the display of a rapid change of information is not possible. This is particularly disadvantageous for applications in motor vehicles. In particular so-called DSTN
Flüssigkristallanzeigen (double layer supertwisted nematic) reagieren bei tiefen Temperaturen sehr träge. Da ein DSTN-LCD aus zwei aufeinanderliegenden Einzelzellen besteht, liegt ein weiteres Problem darin, in den Flüssigkristallschichten der beiden Zellen eine annähernd gleiche Temperatur zu schaffen. Dies ist besonders schwierig zu erreichen, wenn die Erwärmung von einem beabstandeten Bauteil herrührt.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.
Es ist bekannt, eine Flüssigkristallanzeige mittels Drähten zu heizen. Solche Drähte sollen aber nicht in der Anzeigeeinrichtung sichtbar sein. Bei einer derartigen Drahtheizung ist es bekannt, die Heizdrähte in einigem Abstand hinter einer Streuscheibe anzuordnen. Dadurch verringert sich aber die Heizwirkung stark. Außerdem muß an der Anzeigeeinrichtung ei- ne geeignete Halterung für den Heizdraht vorgesehen werden. Zusätzlich muß der Heizdraht an der Halterung befestigt und mit einer Energieversorgung versehen werden.It is known to heat a liquid crystal display by means of wires. However, such wires should not be visible in the display device. With such a wire heater, it is known to arrange the heating wires at some distance behind a diffusing screen. However, this significantly reduces the heating effect. In addition, a suitable holder for the heating wire must be provided on the display device. In addition, the heating wire must be attached to the bracket and provided with a power supply.
Eine Flüssigkristall-Anzeigeeinrichtug nach dem Oberbegriff des Anspruchs 1 ist aus der japanischen Patentanmeldung mit der Veröffentlichungsnummer 1-204024 (Patents Abstracts of Japan, P-959, 14. November 1989, Vol. 13/No. 505) bekannt. Zwischen den Substraten zweier Flüssigkristallzellen ist eine Temperaturkompensationsschicht zum Erwärmen oder Kühlen der Anzeigeeinrichtung angeordnet. Die Temperaturkompensationsschicht weist eine Struktur mit einem Hohlraum auf. Die transparenten Trägerschichten zwischen den Flüssigkristallschichten müssen auf den beiden großflächigen Seiten bearbeitet werden. Dabei ist es prozeßtechnisch sehr schwierig, Ver- unreinigungen auf einer der beiden Seiten zu vermeiden.A liquid crystal display device according to the preamble of claim 1 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.
Aus der japanischen Patentanmeldung mit der Veröffentlichungsnummer 3-107123 (Patents Abstracts of Japan, P-1233, 31 July 1991, Vol. 15/No. 301) ist eine Plattenheizung zum Aus- gleichen von Temperaturunterschieden einer Flüssigkristallzelle bekannt, die von einer Treiberschaltung erwärmt wird.From the Japanese patent application with the publication number 3-107123 (Patents Abstracts of Japan, P-1233, July 31, 1991, Vol. 15 / No. 301), a plate heater for compensating temperature differences of a liquid crystal cell is known, which is heated by a driver circuit becomes.
Aus der Patentschrift US 4,952,783 ist eine lichtdurchlässige, flexible Heizplatte bekannt, die hinter einer herkömmli- chen Flüssigkristall-Anzeigeeinrichtung befestigt wird. Es muß daher als Heizung ein zusätzliches Bauteil hergestellt und an der Flüssigkristall-Anzeigeeinrichtung angebracht werden.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.
Es ist ein Ziel der Erfindung, eine Flüssigkristall- Anzeigeeinrichtung zu schaffen, die bei tiefen Temperaturen eine günstige Temperaturabgabe an eine oder mehrere Flüssigkristallschichten bei minimalem Platzbedarf und einem einfachem Herstellungsprozeß bewirken kann.It is an object of the invention to provide a liquid crystal display device which, at low temperatures, can give a favorable temperature to one or more liquid crystal layers with a minimum of space and a simple manufacturing process.
Dieses Ziel wird mit einer Flüssigkristall-Anzeigeeinrichtung erreicht, wie sie in Anspruch 1 definiert ist. Zweckmäßige Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben. Durch Integration einer transparenten Heizschicht in die Flüssigkristall-Anzeigeeinrichtung erfolgt eine besonders gleichmäßige Temperaturabgabe an eine oder mehrere Flüssig- kristallschichten, ohne die Kompaktheit der Anzeigeeinrichtung zu beeinträchtigen oder ein zusätzliches Bauteil zu schaffen.This object is achieved with a liquid crystal display device as defined in claim 1. Appropriate developments of the invention are specified in the subclaims. By integrating a transparent heating layer in the liquid crystal display device, a particularly uniform temperature is delivered to one or more liquid crystal layers without impairing the compactness of the display device or creating an additional component.
Für den Herstellungsprozeß ist es vorteilhaft, daß die Heiz- schicht aus demselben Material wie die Steuerelektroden bestehen kann.It is advantageous for the manufacturing process that the heating layer can consist of the same material as the control electrodes.
Bei einer DSTN-Flüssigkristall-Anzeigeeinrichtung ergibt sich eine besonders gleichmäßige Temperaturabgabe an beide Flüs- sigkristallschichten, wenn eine Heizschicht zwischen den beiden Flüssigkristallschichten eingebracht ist. Jedoch reicht es aus, wenn die Flüssigkristallschicht an einem Polarisator angebracht ist. Durch die unmittelbare Anbringung an der Flüssigkristall-Anzeigeeinrichtung wird auch die entfernt liegende Flüssigkristallschicht ausreichend erwärmt.In the case of a DSTN liquid crystal display device, there is a particularly uniform temperature output to both liquid crystal layers if a heating layer is introduced between the two liquid crystal layers. However, it is sufficient if the liquid crystal layer is attached to a polarizer. Due to the direct attachment to the liquid crystal display device, the remote liquid crystal layer is also sufficiently heated.
Die transparente Heizschicht kann auf einer Seite einer ohnehin vorhandenen transparenten Trägerschicht unmittelbar aufgebracht sein.The transparent heating layer can be applied directly to one side of an already existing transparent carrier layer.
Weitere Vorteile, Merkmale und Anwendungsmöglichkeiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels in Verbindung mit den Zeichnungen. Es zeigen:Further advantages, features and possible uses of the invention result from the following description of an exemplary embodiment in conjunction with the drawings. Show it:
Figur 1 den schematischen Aufbau einer DSTN-1 shows the schematic structure of a DSTN
Flüssigkristallanzeige mit einer Heizschicht,Liquid crystal display with a heating layer,
Figur 2 eine perspektivische Ansicht einer DSTN-FIG. 2 shows a perspective view of a DSTN
Flüssigkristallanzeige mit einer Heizschicht, Figur 3 eine Seitenansicht der Flüssigkristallanzeige vonLiquid crystal display with a heating layer, Figure 3 is a side view of the liquid crystal display of
Figur 2, und Figur 4 eine flächige Kontaktierung der Heizschicht.Figure 2, and Figure 4, a flat contact of the heating layer.
Figur 1 zeigt eine DSTN-Flüssigkristallanzeige mit einer steuerbaren oder aktiven Flüssigkristallschicht 1, die aus einer Vielzahl von Flüssigkristallmolekülen besteht, und eine passive Flüssigkristallschicht 5 auf, für die keine Elektroden vorgesehen sind.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.
Die steuerbare Flüssigkristallschicht 1 ist zwischen zwei transparenten Trägerschichten 3 eingebettet. Die transparenten Trägerschichten 3 sind Substrate aus Glas. Die zur Flüssigkristallschicht 1 zugewandten Seiten der transparenten Trägerschichten 3 sind von transparenten Elektroden 2, die mit einer Orientierungsschicht versehen sind, bedeckt. Die transparenten Elektroden 2 steuern die Flüssigkristallschicht 1 und bewirken somit eine Anzeige.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.
Die passive Flüssigkristallschicht 5 ist ebenfalls zwischen zwei Trägerschichten 3 eingebettet, wodurch sich in diesem Beispiel vier Trägerschichten 3 ergeben.The passive liquid crystal layer 5 is likewise embedded between two carrier layers 3, which results in four carrier layers 3 in this example.
Die transparenten Trägerschichten 3, die die passive Flüssig- kristallschicht 5 einbetten, weisen an ihren der Flüssigkristallschicht 5 zugewandten Seiten statt der transparenten Elektroden 2 lediglich eine Orientierungsschicht 7 auf. Die beiden äußeren transparenten Trägerschichten 3 weisen auf ihrer Außenseite jeweils eine Schicht mit einem Polarisator 6 auf.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.
Die Heizschicht 4 ist an der Trägerschicht 3 der passiven Flüssigkristallschicht 5 aufgebracht, die in Richtung der aktiven Flüssigkristallschicht 1 angeordnet ist. Dadurch kann sie eine relativ gleichmäßige Erwärmung beider Flüssigkristallschichten bewirken.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.
Aus fertigungstechnischer Sicht ist es besonders günstig, ei- ne Heizschicht 4 auf der der passiven Flüssigkristallschicht 5 zugewandten Seite der Trägerschicht 3 anzubringen, da in diesem Fall nur eine Seite der Trägerschicht behandelt werden muß. Besonders günstig ist es, die Heizschicht 4 zwischen der Trägerschicht 3 und der Orientierungsschicht 7 anzuordnen, wie dies in Figur 1 dargestellt ist.From a production point of view, it is particularly favorable to apply a heating layer 4 on the side of the carrier layer 3 facing the passive liquid crystal layer 5, since in this case only one side of the carrier layer has to be treated. It is particularly favorable to arrange the heating layer 4 between the carrier layer 3 and the orientation layer 7, as is shown in FIG. 1.
Als Heizschicht eignet sich ein Zinnoxid und insbesondere Indium-Zinnoxid (ITO) .A tin oxide and in particular indium tin oxide (ITO) are suitable as the heating layer.
Durch die Integration der transparenten Heizschicht 4 in die Flüssigkristall-Anzeigeeinrichtung wird deren Baugröße kaum beeinflußt. Beim Einbau in ein Gehäuse müssen keine zusätzlichen Bauteile für eine Heizung angebracht werden.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.
Die Heizschicht 4 kann auch strukturiert werden, so daß die beiden elektrischen Anschlußkontakte (Heizschichtkontakte) für die Heizschicht 4 auf einer Seite der Flüssigkristall- Anzeigeeinrichtung angebracht werden können. In diesem Fall muß durch einen Spalt oder ein geometrischen Muster oder eine besondere Aufteilung der Heizschicht in Zonen ein Kurzschluß vermieden werden.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.
Die Dicke einer Indium-Zinnoxid-Schicht kann zwischen 10 nm und 300 nm liegen, wobei ein Transmissionsgrad von mehr als 80% erreicht werden kann. Besonders geeignet für die Heizschicht ist ein Wert zwischen 50 nm und 150 nm. Bei einem Display mit einer Abmessung von 9 cm x 3 cm kann hiermit ein Widerstand der Heizschicht von 10 Ohm erzielt werden. Bei tiefen Temperaturen, wie sie im Winter in Kraftfahrzeugen auftreten können, die im Freien abgestellt sind, wird an die Heizschicht 4 eine Spannung angelegt. Dadurch wird die Trägerschicht 3 und die Flüssigkristallschicht 1 erwärmt. Hat die Flüssigkristallschicht eine Temperatur von wenigstens 0°C erreicht, werden selbst bei Umgebungstemperaturen von -30°C Schaltzeiten erreicht, die die Darstellung von schnellen Bildwechseln erlauben, wie dies beispielsweise für die Anzeige einer Telefonnummerneingabe notwendig ist.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.
Zur Wärmeerzeugung ist ein Betriebsstrom für eine Heizschicht aus Indium-Zinnoxid im Bereich von 0,05A bis 0,2A pro Zentimeter Breite der Heizschicht 4 besonders geeignet.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.
Figur 2 gibt die räumliche Form einer erfindungsgemäßen DSTN- Flüssigkristall-Anzeige wieder. Die mit der transparenten Heizschicht 4 und den transparenten Elektroden 2 versehenen transparenten Trägerschichten 3 ragen seitlich aus der Anzeigeeinrichtung hervor, um Kontaktflächen für Steuerkontakte der transparenten Elektroden 2 und für Heizschichtkontakte zu bilden.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.
Aus Figur 3 ist erkennbar, daß die Trägerschicht 3, die die Steuerelektroden für die aktive Flüssigkristallschicht 1 auf- weist, und die Trägerschicht 3, die die Heizschicht 4 aufweist, jeweils seitlich hervorragen, um auf einfache Weise mit Kontakten versehen zu werden. Die mit der Heizschicht 4 versehene Trägerschicht 3 ragt umlaufend gegenüber der äußeren Trägerschicht für die passive Flüssigkristallschicht 5 hervor. Dadurch ergibt sich die Möglichkeit eine besonders großflächige Kontaktierung für die Heizschicht herzustellen, über die Strom an die Heizschicht zugeführt und abgeführt werden kann. Die äußere Trägerschicht der steuerbaren Flüssigkristallschicht 1 springt an einer Seite nochmals gegen- über der inneren Trägerschicht der aktiven Flüssigkristall- Schicht 1 hervor. Es ergibt sich somit eine Art von Treppenprofil.It can be seen from FIG. 3 that the carrier layer 3, which has the control electrodes for the active liquid crystal layer 1, and the carrier layer 3, which has the heating layer 4, each project laterally in order to be provided with contacts in a simple manner. 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.
Figur 4 ist eine Draufsicht auf Figur 3. Es sind die Kontakt- flächen 8 dargestellt, die zum Anlegen der Betriebsspannung dienen. Für die Kontaktierung wurden die gegenüberliegenden Seiten ausgewählt, die am längsten sind. Die Auswahl der Kon- taktierungsseiten erfolgt in Abhängigkeit von der Geometrie der Heizfläche, die von der Heizschicht 4 bereitgestellt wird. Eine flächige Kontaktierung zwischen einer Energiezuführung und der Heizschicht 4 kann beispielsweise über einen Leitkleber, einem elektrisch leitenden Gummi der in der Of- fenlegungsschrift DE 31 37 864 AI beschriebenen Art, Metallklammern oder Metallstiften erfolgen. 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.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29823400U DE29823400U1 (en) | 1997-08-01 | 1998-07-13 | Heated liquid crystal display device |
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 (en) | 1999-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE1998/001956 Ceased WO1999006885A1 (en) | 1997-08-01 | 1998-07-13 | Heatable liquid crystal display device |
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| Country | Link |
|---|---|
| DE (1) | DE29823400U1 (en) |
| WO (1) | WO1999006885A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0915360A3 (en) * | 1997-11-07 | 2000-01-19 | Mannesmann VDO Aktiengesellschaft | Display device |
| GB2361775A (en) * | 2000-01-21 | 2001-10-31 | Hosiden Corp | Two-layer LCD with heater |
| EP1193679A2 (en) | 2000-09-28 | 2002-04-03 | Siemens Aktiengesellschaft | Liquid crystal display, especially for a motor vehicle |
| KR20020034941A (en) * | 2000-10-31 | 2002-05-09 | 존슨 테렌스 레슬리 | Ito heater |
| US6678033B1 (en) | 1997-11-07 | 2004-01-13 | Mannesmann Vdo Ag | Liquid crystal display with heater |
| CN110045532A (en) * | 2019-04-30 | 2019-07-23 | 武汉华星光电技术有限公司 | Liquid crystal display panel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3438756A1 (en) * | 1984-10-23 | 1986-04-24 | Borg Instruments GmbH, 7537 Remchingen | Double twisted cell display device |
| JPH01204024A (en) * | 1988-02-10 | 1989-08-16 | Toshiba Corp | Liquid crystal display device |
| US5247374A (en) * | 1990-04-05 | 1993-09-21 | Stanley Electric Co., Ltd. | Liquid crystal display device with common heater between two cells |
-
1998
- 1998-07-13 DE DE29823400U patent/DE29823400U1/en not_active Expired - Lifetime
- 1998-07-13 WO PCT/DE1998/001956 patent/WO1999006885A1/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3438756A1 (en) * | 1984-10-23 | 1986-04-24 | Borg Instruments GmbH, 7537 Remchingen | Double twisted cell display device |
| JPH01204024A (en) * | 1988-02-10 | 1989-08-16 | Toshiba Corp | Liquid crystal display device |
| 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)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 013, no. 505 (P - 959) 14 November 1989 (1989-11-14) * |
Cited By (12)
| 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 (en) * | 1997-11-07 | 2000-01-19 | Mannesmann VDO Aktiengesellschaft | Display device |
| 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 (en) | 2000-09-28 | 2002-04-03 | Siemens Aktiengesellschaft | Liquid crystal display, especially for a motor vehicle |
| EP1193679A3 (en) * | 2000-09-28 | 2006-02-01 | Siemens Aktiengesellschaft | Liquid crystal display, especially for a motor vehicle |
| KR20020034941A (en) * | 2000-10-31 | 2002-05-09 | 존슨 테렌스 레슬리 | Ito heater |
| EP1202107A3 (en) * | 2000-10-31 | 2003-10-01 | Varintelligent (Bvi) Limited | An ITO heater |
| US7023519B2 (en) | 2000-10-31 | 2006-04-04 | Varintelligent (Bvi) Limited | Internal heater embedded in an LCD cell |
| CN110045532A (en) * | 2019-04-30 | 2019-07-23 | 武汉华星光电技术有限公司 | Liquid crystal display panel |
Also Published As
| Publication number | Publication date |
|---|---|
| DE29823400U1 (en) | 1999-05-27 |
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