DE8120919U1 - Passive electro-optical display device - Google Patents
Passive electro-optical display deviceInfo
- Publication number
- DE8120919U1 DE8120919U1 DE8120919U DE8120919DU DE8120919U1 DE 8120919 U1 DE8120919 U1 DE 8120919U1 DE 8120919 U DE8120919 U DE 8120919U DE 8120919D U DE8120919D U DE 8120919DU DE 8120919 U1 DE8120919 U1 DE 8120919U1
- Authority
- DE
- Germany
- Prior art keywords
- display device
- cell
- reflector
- light source
- viewer
- 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.)
- Expired
Links
- 239000004973 liquid crystal related substance Substances 0.000 claims description 7
- 239000000969 carrier Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 210000004027 cells Anatomy 0.000 description 11
- NIJJYAXOARWZEE-UHFFFAOYSA-N Depacane Chemical compound CCCC(C(O)=O)CCC NIJJYAXOARWZEE-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000051 modifying Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133504—Diffusing, scattering, diffracting elements
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133553—Reflecting elements
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133616—Front illuminating devices
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133626—Illuminating devices providing two modes of illumination, e.g. day-night
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)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
SIEMENS AKTIENGESELLSCHAFT Unser Zeichen Berlin und München VPA gj β 1 O 9 3 OESIEMENS AKTIENGESELLSCHAFT Our reference Berlin and Munich VPA gj β 1 O 9 3 OE
Passive elektro-optische Anzeigevorrichtung.Passive electro-optical display device.
Die Neuerung betrifft ein Display gemäß dem Oberbegriff des Anspruchs 1. Eine solche Flüssigkristallanzeige wird beispielsweise in dem von M.Tobias herausgegebenen "International Handbook of Liquid Crystal Displays 1975 bis 1976", Abschnitt 8.2, beschrieben.The innovation relates to a display according to the preamble of claim 1. Such a liquid crystal display is for example in the "International Handbook of Liquid Crystal Displays 1975 published by M. Tobias bis 1976 ", Section 8.2.
Passive Anzeigevorrichtungen, die bekanntlich keine eigene Strahlung erzeugen, sondern nur das Licht der Umgebung modulieren, benötigen dann, wenn sie auch bei Dunkelheit Informationen liefern sollen, eine Zusatzbeleuchtung. Bei Flüssigkristallanzeigen ist es üblich geworden, eine Lichtquelle hinter die Zelle zu plazieren und dazwischen einen halbdurchlässigen Reflektor ("Transflektor") zu setzen. Das Display arbeitet dann bei ausreichender Umgebungshelli^keit reflexiv und bei eingeschalteter Beleuchtung zusätzlich oder ausschließlich transmissiv. Diese Bauform ist vor allem deshalb attraktiv, weil die lichtemittierenden und-leitenden Elemente vor dem Betrachter verborgen bleiben und relativ wenig Platz beanspruchen. Allerdings hat ein Transflektor nur mäßige Reflexionseigenschaften, so daß man auch unter günstigen Helligkeitsverhältnissen nur ein relativ kontrastarmes Bild erhält und die - in der Regel leistungsverzehrende - Lichtquelle recht häufig aktivieren muß.Passive display devices which, as is well known, do not generate their own radiation, but only the light from the environment modulate need additional lighting if they are to provide information even in the dark. In liquid crystal displays it has become common practice to place a light source behind the cell and put a semi-transparent reflector ("transflector") in between. The display then works with sufficient Ambient brightness reflexively and additionally or exclusively when the lighting is switched on transmissive. This design is particularly attractive because of the light-emitting and light-conducting elements remain hidden from the viewer and take up relatively little space. However, one transflector only has moderate reflection properties, so that even under favorable brightness conditions only a relatively low-contrast Image receives and the - usually performance-consuming - Has to activate the light source quite often.
Aus diesem Grund ist die Fachwelt auch schon seit längerem bemüht, die Lichtzufuhr so zu gestalten, daß die Anzeige ausschließlich in Reflexion betrieben werden kann. So hat man beispielsweise spezielle Optiken entwickelt, die vor die Zelle gesetzt werden und das angelieferte Les 1 Lk/15.7.1981For this reason, experts have long tried to make the light supply so that the display can only be operated in reflection. For example, special optics have been developed which are placed in front of the cell and the delivered Les 1 Lk / 07.15.1981
·»» ti' * I I *· »» Ti '* I I *
- 2 - VPA 81 G t O 9 3 DE- 2 - VPA 81 G t O 9 3 DE
Kunstlicht in das Innere der Anzeige schicken (DE-GM | 80 32 102). Mit diesem Konzept erhält man auch bei Tage brauchbare Bildkontraste, die Leuchtkraft ist aber noch nicht optimal, weil letztlich nur das aus der Richtung der Lichtquelle stammende Umlicht in vollem Maße verwer- |Send artificial light inside the ad (DE-GM | 80 32 102). With this concept you can also get by day Usable image contrasts, but the luminosity is not yet optimal, because ultimately only that from the direction The ambient light coming from the light source is completely discarded |
tet wird.is tet.
Der Neuerung liegt daher die Aufgabe zugrunde, ein passives elektro-optisches Display mit einer Zusatzbeleuchtung zu schaffen, das ausschließlich mit Auflicht auskommt, | dabei eine vergleichsweise leistungsschwache Lichtquelle verlangt und unter allen Lichtbedingungen gut erkennbare Bilder zur Darstellung bringt. Diese Aufgabe wird neuerungsgemäß durch eine Anzeigevorrichtung mit den Merkmalen des Anspruchs 1 gelöst.The innovation is therefore based on the task of a passive electro-optical display with additional lighting to create that only works with incident light, | a comparatively low-powered light source is required and is easily recognizable under all lighting conditions Brings images to display. According to the invention, this object is achieved by a display device having the features of claim 1 solved.
Das vorgeschlagene Display zeichnet sich vor allem dadurch aus, daß es relativ wenig Zusatzelemente verlangt, die überdies einfach gefertigt werden können und mit denen sich handelsübliche Anzeigetypen ohne weiteres nachrüsten lassen. Hinzukommt, daß die Anzeige auch Änderungen in der Hauptbetrachtungsrichtung gestattet: Man braucht lediglich den diffusen Reflektor drehbar zu lagern und in geeigneter Weise zu verkippen. Im übrigen |The main feature of the proposed display is that it requires relatively few additional elements, which, moreover, can be easily manufactured and with which commercially available display types can be easily retrofitted permit. In addition, the display also allows changes in the main viewing direction: Man only needs to rotate the diffuse reflector and tilt it in a suitable manner. Otherwise |
könnte man diesen Reflektor dann, wenn man möglichst | viel Umgebungslicht in das Display führen will, auch ganz wegklappen.you could use this reflector if you could use | wants to lead a lot of ambient light into the display, too fold away completely.
Eine neuerungsgemäße Anzeigevorrichtung findet insbesondere -dort Verwendung, wo der Ort des Displays und der f des Betrachters stationär sind, beispielsweise als Monitor einer Schreibmaschine mit Speichervermögen, und eig- | net sich vor allem für langgestreckte Anzeigeformate, etwa zur Darstellung von Datenzeilen. |A display device according to the invention is used in particular where the location of the display and the f of the viewer are stationary, for example as a monitor of a typewriter with storage capacity, and own | net is particularly suitable for elongated display formats, for example for displaying lines of data. |
HH
- 3 - VPA 81 G J O 9 3 OE- 3 - VPA 81 G J O 9 3 OE
Weitere vorteilhafte Ausgestaltungen und Weiterbildungen der Neuerung sind Gegenstand zusätzlicher Ansprüche. Further advantageous refinements and developments of the innovation are the subject of additional claims.
Der Lösungsvorschlag soll nun anhand eines bevorzugten Ausfiihrungsbeispiels unter Hinzunahme der beigefügten Figur näher erläutert werden.The proposed solution will now be based on a preferred exemplary embodiment with the addition of the enclosed Figure will be explained in more detail.
Die Figur zeigt in einer stark schematisierten Perspektivansicht eine Flüsigkristallzelle 1, die im vorliegenden Fall aus einem vorderen Linearpolarisator 2, einer vorderen Trägerplatte (Vorderplatte) 3, einer hinteren Trägerplatte (Rückplatte) 4, einem hinteren, zum vorderen gekreuzten Linearpolarisator 6 und einem ersten Reflektor 7 besteht. Die beiden Trägerplatten sind durch einen - nicht dargestellten - Rahmen miteinander verbunden, und die (ebenfalls nicht eingezeichnete) Kammer zwischen den Platten und dem Rahmen ist mit einer Flüssigkristallsubstanz gefüllt. Die Zelle arbeitet nach dem Prinzip der sogenannten "Drehzelle", die in der DE-AS 21 58 563 ausführlich dargestellt wird.The figure shows a highly schematic perspective view of a liquid crystal cell 1, which in the present case Case from a front linear polarizer 2, a front support plate (front plate) 3, a rear Carrier plate (back plate) 4, a rear, to the front crossed linear polarizer 6 and a first reflector 7 consists. The two carrier plates are connected to one another by a frame (not shown). and the chamber (also not shown) between the panels and the frame is covered with a liquid crystal substance filled. The cell works on the principle of the so-called "rotary cell", which is used in DE-AS 21 58 563 is shown in detail.
Die Zelle wird im wesentlichen aus einer Richtung abgelesen, die schräg zur Normalen auf die zueinander parallelen Grundflächen der beiden Trägerplatten verläuft. Diese Hauptbetrachtungsrichtung ist mit 8 bezeichnet.The cell is read essentially from a direction which is oblique to the normal to the direction parallel to one another Base surfaces of the two carrier plates runs. This main viewing direction is denoted by 8.
Im Bereich der dem Betrachter zugewandten Schmalseite der Zelle, also derjenigen Seite, die von der Projektion der Hauptbetrachtungsrichtung auf die Displayebene gegeschnitten wird, sind mehrere kleine Lämpchen plaziert, von denen der Übersicht halber nur ein einziges Exemplar (Lampe 9) eingezeichnet ist. Diese Strahler werden gegenüber dem Betrachter von einem winkelförmig -geknickten Blech 11 abgeschirmt, dessen einer Schenkel an der Zelle befestigt ist. An der dem Betrachter abgewandten Zellenschmalseite ist ein diffuser weißer Reflektor 12 -In the area of the narrow side of the cell facing the viewer, i.e. the side that is exposed to the projection the main viewing direction is cut to the display level, several small lamps are placed, of which only a single copy (lamp 9) is shown for the sake of clarity. These emitters are opposite shielded from the viewer by an angular-bent sheet metal 11, one leg of which is on the cell is attached. On the narrow side of the cell facing away from the viewer is a diffuse white reflector 12 -
- 4 - VPA 81 G 1 O 9 3 DE- 4 - VPA 81 G 1 O 9 3 DE
- schwenkbar um eine Drehachse 13 - montiert. Das von den Lämpchen abgegebene Licht wird, mit Unterstützung der reflektierenden Innenflächen des Bleches 11, im wesentlichen auf den Reflektor 12 geschickt, von dort 5 durch die Zelle 1 zum Reflektor 7 gestreut und an dieser Ebene zum Betrachter hin rückflektiert.- pivotable about an axis of rotation 13 - mounted. That from The light emitted to the lamp is, with the assistance of the reflective inner surfaces of the plate 11, essentially sent to the reflector 12, scattered from there 5 through the cell 1 to the reflector 7 and on this Level reflected back towards the viewer.
Die Displayteile bestehen aus folgenden Materialien: Die eigentliche Zelle ist aus herkömmlichen Teilen aufgebaut, 10 wobei der Reflektor 7 eine lichtdurchlässige, gebürstete .ί Aluminiumfolie sein kann. Als Reflektor 12 läßt sichThe display parts consist of the following materials: The actual cell is made up of conventional parts, 10 wherein the reflector 7 can be a translucent, brushed .ί aluminum foil. As a reflector 12 can
I eine mit weißer bzw. heller Farbe versehene Platte ver-I use a white or light colored plate
j wenden. Die Lichtquellen können der Einfachheit halberj turn. The light sources can be used for the sake of simplicity
I Glühlämpchen sein.I be light bulbs.
I ' Das vom Reflektor 12 gestreute Licht wird zu einem sehr έ geringen Teil auch an der glatten Frontseite der Zelle I 'The scattered light from the reflector 12 becomes a very small part of έ also to the smooth front side of the cell
* reflektiert. Da es sich um eine gleichmäßige Lichtverteir- * reflected. Since it is a uniform light distribution
I- lung handelt, ist dies nicht annähernd so störend wie inI-ling is not nearly as disruptive as in
\ 20 Fällen, in denen die Beieuchtungsquellen die Displayober-I fläche direkt bestrahlen. Bei Bedarf könnte der geringe \ 20 cases in which the sources of illumination irradiate the display surface directly. If necessary, the low
I Reflex durch eine leichte Oberflächenmattierung, durchI reflex through a light surface matting
1 die die Konturenschärfe nur unwesentlich leidet, besei- 1 which only marginally suffers from the sharpness of the contours,
I tigt werden.I should be done.
I Die Neuerung ist nicht auf das dargestellte Ausführungs-I The innovation is not limited to the illustrated
'i beispiel beschränkt. So kommen neben Flüssigkristallan-'i limited example. In addition to liquid crystal
: zeigen auch andere passive elektro-optische Displays,: also show other passive electro-optical displays,
I etwa elektrochrome Anzeigen in Frage. Davon abgesehen I was questioning about electrochromic displays. Besides that
I 30 läßt sich die Anzeige auch noch konstruktiv in einer ■: Vielzahl von Einzelheiten ändern, ohne daß man vom Prinzip des vorliegenden Lösungsvorschlags abgehen müßte. So könnte man im Lichterzeugersystem das Winkelblech durch •t anders geformte Hauben ersetzen oder andere Fokussier-I 30, the display can also be constructive in a ■: Change number of details without that one would depart from the principle of this proposed solution. For example, the angle plate in the light generator system could be replaced by differently shaped hoods or other focusing
I 35 mittel verwenden. Im übrigen wäre es auch durchaus mögi lieh, den rückwärtigen Reflektor als Spiegelschicht aus-I use 35 medium. In addition, it would also be quite possible borrowed the rear reflector as a mirror layer
• ·· »»»err .• ·· »» »err.
VPA 81 G 1 O 9 3 OF VPA 81 G 1 O 9 3 OF
zubilden, ohne daß man Spiegelungseffekte befürchten müßte.without having to fear reflection effects.
8 Schutzansprüche 1 Figur8 claims for protection 1 figure
■ I I ti ■ I t■ I I ti ■ I t
Il Il IlIl Il Il
Claims (8)
Publications (1)
Publication Number | Publication Date |
---|---|
DE8120919U1 true DE8120919U1 (en) | 1981-11-26 |
Family
ID=1328746
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8120919U Expired DE8120919U1 (en) | Passive electro-optical display device |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE8120919U1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0089215A1 (en) * | 1982-03-13 | 1983-09-21 | Edward Raymond Stevens | Hazard warning device |
DE202005002034U1 (en) * | 2005-02-08 | 2006-06-22 | Aeg Gesellschaft für Moderne Informationssysteme mbH | Reflective liquid crystal display device, has illuminant and illuminant reflector unit arranged at border area and reflector curved in concave manner in direction of illuminant and lies perpendicular to active display area |
-
0
- DE DE8120919U patent/DE8120919U1/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0089215A1 (en) * | 1982-03-13 | 1983-09-21 | Edward Raymond Stevens | Hazard warning device |
DE202005002034U1 (en) * | 2005-02-08 | 2006-06-22 | Aeg Gesellschaft für Moderne Informationssysteme mbH | Reflective liquid crystal display device, has illuminant and illuminant reflector unit arranged at border area and reflector curved in concave manner in direction of illuminant and lies perpendicular to active display area |
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