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EP0374085A2 - Electro-optical planar display, in particular an LCD display panel - Google Patents

Electro-optical planar display, in particular an LCD display panel Download PDF

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Publication number
EP0374085A2
EP0374085A2 EP89730208A EP89730208A EP0374085A2 EP 0374085 A2 EP0374085 A2 EP 0374085A2 EP 89730208 A EP89730208 A EP 89730208A EP 89730208 A EP89730208 A EP 89730208A EP 0374085 A2 EP0374085 A2 EP 0374085A2
Authority
EP
European Patent Office
Prior art keywords
housing
display elements
light guide
electro
lcd display
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.)
Granted
Application number
EP89730208A
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German (de)
French (fr)
Other versions
EP0374085B1 (en
EP0374085A3 (en
Inventor
Herbert Sperl
Hartmuth Siefker
Frank Mössner
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.)
Funkwerk Systems GmbH
Original Assignee
Krone GmbH
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Publication date
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Priority to AT89730208T priority Critical patent/ATE94674T1/en
Publication of EP0374085A2 publication Critical patent/EP0374085A2/en
Publication of EP0374085A3 publication Critical patent/EP0374085A3/en
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Publication of EP0374085B1 publication Critical patent/EP0374085B1/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0418—Constructional details
    • G09F2013/05—Constructional details indicating exit way or orientation

Definitions

  • the invention relates to an electro-optical flat display device, in particular an LCD display panel according to the preamble of claim 1.
  • An electro-optical flat display device of the generic type designed as an LCD display panel is previously known from EP 0.146.285.
  • several display elements are arranged side by side in five horizontal rows, each of which is formed from a 5x3 matrix.
  • the five rows of LCD display elements form the front of the housing.
  • Two fluorescent lamps, which extend in the longitudinal direction of the rows of LCD display elements, are installed in the housing as the lighting device.
  • the disadvantage here is a high heat development of the fluorescent lamps within the flat housing, so that fans must be attached to the housing regularly for heat dissipation.
  • Another disadvantage is that the fluorescent lamps have to be replaced after a certain burning time.
  • the individual rows of LCD display elements are arranged foldably on the front of the housing, so that the fluorescent lamps provided on the back of the housing with a reflector can be replaced from the front of the housing.
  • Another disadvantage is that the LCD display elements are constantly exposed to UV and heat radiation. This leads to the decomposition and destruction of the dyes within the LCD display elements, so that they have to be replaced after a long period of use.
  • a further disadvantage is that the fluorescent lamps must be associated with electrical installation devices inside the housing or on the rear thereof, which also generate heat and are heavy in weight.
  • the necessity of the foldable arrangement of the LCD display elements through a large number of housing openings allows dust to penetrate into the interior of the housing, which is deposited on the fluorescent lamps on the one hand and on the inside of the LCD display elements on the other and for premature light attenuation leads.
  • the invention is therefore based on the object of improving an electro-optical flat display device, in particular an LCD display panel, of the generic type in such a way that the lighting device is considerably simplified in order to achieve a more compact flat display device, the display elements of which are not UV or Heat radiation can still be exposed to dust, and which is particularly easy to maintain.
  • the backlighting of the display elements takes place by means of a light guide tube which is assigned to the row of display elements and is arranged in the interior of the housing and whose light source is at one end of the light guide tube. in particular outside the housing.
  • the light pipe is made of translucent material and is surrounded by a reflector, so that the entire light radiation emanating from the light source is constantly reflected within the light guide tube and can only emerge directly through the cutouts of the reflector in the area of the individual display elements. On the one hand, this enables full utilization of the light radiation from the light source.
  • the housing can thus be encapsulated in a dust-tight manner. Furthermore, there is no electrical installation inside the housing. A ventilation device of the housing is also no longer required.
  • the light source is arranged at the end of the light guide tube located outside the housing, and color and heat filters are placed in front of the light source.
  • the electronic components for controlling the LCD display elements can be arranged in the housing spaces formed between them.
  • Optical tubes are known per se, for example from DE 34 30 191. However, these serve exclusively as luminous elements for room lighting, whereas the use of such light guide tubes in electro-optical flat display devices, in particular LCD display panels, is claimed according to the invention.
  • the LCD display panel consists of a flat housing 1 with rear wall 2, top wall 3, bottom wall 4, side walls 5 and with partition walls 6 which extend between the side walls 5 parallel to top wall 3 and bottom wall 4 and form the individual chambers 7.
  • the front 8 of the housing is essentially formed by rows 9 of LCD display elements 10, which in the exemplary embodiment are designed as known 7-segment display elements. Instead of the 7-segment display elements, 3x5 matrix elements or the like can also be used. The structure of such LCD display elements is described in more detail in EP 0.146.285.
  • the LCD display elements 10 are accommodated by profiles 11 which extend longitudinally on the front side 8 and which are fastened to the top wall 3 and the bottom wall 4 and to the intermediate walls 6.
  • the electronic components 23 assigned to the individual LCD display elements 10 are mounted on the intermediate walls 6. On the inside, the LCD display elements 10 are assigned to diffusers 24.
  • the entire housing 1 is encapsulated in a dust-tight manner.
  • Light guide tubes 12 are arranged within the individual chambers 7 of the housing 1, which are U-shaped in the exemplary embodiment, the open side of the U-shape being formed by a strip-shaped wall 13.
  • the light guide tubes 12 and the U-shaped closing walls 13 are surrounded by reflection material 14, which has cutouts 15 only in the area of the LCD display elements 10, which serve as light exit openings and whose surface dimensions correspond exactly to those of the LCD display elements 10 to be illuminated and are assigned to them is.
  • concentrators 16 are still mounted in the rear curvature area of the U-shape, which direct the light that is totally totally reflected in the light guide tubes 10 onto the opposite cutouts 15 of the reflector material 14.
  • Each light guide tube 12 is connected to a light guide tube 17 lying outside the housing 1, which has at one end a light source 18 which introduces all of its light radiation into the light guide tube 17 by means of a suitable reflector 25.
  • Deflecting mirrors 19, 20 are arranged at the bends of the light guide tube 17 and at the entry points of the light guide tubes 12, the deflecting mirrors 19 deflecting all of the light radiation supplied and the deflecting mirrors 20 deflecting only partial radiation into the respective light guide tubes 17 and 12, respectively.
  • the light source 18 is preceded by a heat filter 21 in the form of a glass pane and a color filter 22 which is in the form of an electrically controllable, birefringent color filter in liquid crystal technology (ECB-LC filter).
  • the light radiation emanating from the light source 18 is totally introduced into the individual light guide tubes 12 via the light guide tube 17 and the deflecting mirror 19, 20.
  • the light guide tube 17 and the deflecting mirror 19, 20 There is a constant total reflection of the introduced light radiation on the walls of the light guide tubes 12, including the flat walls 13 assigned to them.
  • Additional mirrors for largely lossless reflection of the light radiation are arranged at the end opposite the light source 18 in a manner not shown in detail.
  • the light radiation which is thus totally totally reflected within the light guide tubes 12 can only emerge through the light exit openings 15 which are assigned to the respective LCD display elements 10.
  • the intensity of the light radiation emerging here is further increased by means of the concentrators 16.
  • a material known per se is used as the material for the light guide tube 12 and the wall 13 closing it.
  • a reflection film is used, which is described in DE 34 30 191 A1 using the example of a luminous element with a prismatic light guide for room lighting.
  • a special design of the outer contour of the light-guiding film serves for total reflection of the light radiation within a light-guiding tube 12, with the radiation only being able to exit within the cutouts 15.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal Substances (AREA)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Die Erfindung bezieht sich auf eine elektro-optische Flachanzeigeeinrichtung, insbesondere LCD-Anzeigetafel, aus einem flachen Gehäuse (1), mit mindestens einer die Vorderseite (8) des Gehäuses (1) bildenden Reihe von LCD-Anzeigeelementen (10) und mit einer im Innern des Gehäuses (1) angeordneten, der Reihe von LCD-Anzeige­elementen (10) zugeordneten Beleuchtungseinrichtung.The invention relates to an electro-optical flat display device, in particular an LCD display panel, consisting of a flat housing (1), with at least one row of LCD display elements (10) forming the front (8) of the housing (1) and with an Lighting device arranged inside the housing (1) and assigned to the row of LCD display elements (10).

Zur Verminderung der Wärmebelastung der LCD-Anzeige­elemente (10) und zur Vereinfachung des Aufbaus des Gehäuses (1) ist erfindungsgemäß vorgesehen, daß die Beleuchtungseinrichtung aus einer im Innern des Gehäuses (1) angeordneten Lichtleitröhre (12,17) und aus einer an einer Lichteintrittsöffnung der Lichtleitröhre (12,17) angeordneten Lichtquelle (18) gebildet ist, daß die Lichtleitröhre (12,17) aus lichtdurchlässigem Material besteht und von einem Reflektormaterial (14) umgeben ist und daß das Reflektormaterial (14) den einzelnen Anzeigeelementen (10) zugeordnete Ausschnitte (15) als Licht­austrittsöffnungen aufweist.

Figure imgaf001
In order to reduce the thermal load on the LCD display elements (10) and to simplify the construction of the housing (1), the lighting device consists of a light guide tube (12, 17) arranged inside the housing (1) and a light inlet opening the light guide tube (12, 17) arranged light source (18) is formed that the light guide tube (12, 17) consists of translucent material and is surrounded by a reflector material (14) and that the reflector material (14) is assigned to the individual display elements (10) Has cutouts (15) as light exit openings.
Figure imgaf001

Description

Die Erfindung bezieht sich auf eine elektro-optische Flach­anzeigeeinrichtung, insbesondere LCD-Anzeigetafel gemäß dem Oberbegriff des Anspruches 1.The invention relates to an electro-optical flat display device, in particular an LCD display panel according to the preamble of claim 1.

Eine als LCD-Anzeigetafel ausgebildete elektro-optische Flachanzeigeeinrichtung der gattungsgemäßen Art ist aus der EP 0.146.285 vorbekannt. Bei dieser sind in fünf horizon­talen Reihen jeweils mehrere Anzeigeelemente nebeneinander angeordnet, die jeweils aus einer 5x3-Matrix gebildet sind. Die fünf Reihen von LCD-Anzeigeelementen bilden die Vorder­seite des Gehäuses. Im Gehäuse sind zwei, sich in Längs­richtung der Reihen von LCD-Anzeigeelementen erstreckende Leuchtstofflampen als Beleuchtungseinrichtung installiert.An electro-optical flat display device of the generic type designed as an LCD display panel is previously known from EP 0.146.285. In this case, several display elements are arranged side by side in five horizontal rows, each of which is formed from a 5x3 matrix. The five rows of LCD display elements form the front of the housing. Two fluorescent lamps, which extend in the longitudinal direction of the rows of LCD display elements, are installed in the housing as the lighting device.

Nachteilig hierbei ist eine große Wärmeentwicklung der Leuchtstofflampen innerhalb des flachen Gehäuses, so daß zur Wärmeableitung regelmäßig Ventilatoren am Gehäuse angebracht werden müssen. Nachteilig ist ferner, daß die Leuchtstofflampen nach einer bestimmten Brenndauer ausge­wechselt werden müssen. Hierzu sind die einzelnen Reihen von LCD-Anzeigeelementen klappbar auf der Vorderseite des Gehäuses angeordnet, so daß die auf der Gehäuserückseite mit einem Reflektor versehenen Leuchtstofflampen von der Vorderseite des Gehäuses her ausgewechselt werden können.The disadvantage here is a high heat development of the fluorescent lamps within the flat housing, so that fans must be attached to the housing regularly for heat dissipation. Another disadvantage is that the fluorescent lamps have to be replaced after a certain burning time. For this purpose, the individual rows of LCD display elements are arranged foldably on the front of the housing, so that the fluorescent lamps provided on the back of the housing with a reflector can be replaced from the front of the housing.

Nachteilig ist ferner, daß die LCD-Anzeigeelemente ständig durch UV- und Wärme-Strahlung belastet werden. Dies führt zur Zersetzung und Zerstörung der Farbstoffe innerhalb der LCD-Anzeigeelemente, so daß diese nach längerer Benutzungs­zeit ausgewechselt werden müssen. Ferner besteht ein Nach­teil darin, daß den Leuchtstofflampen elektrische Installa­tionseinrichtungen innerhalb des Gehäuses oder auf dessen Rückseite zugeordnet sein müssen, welche ebenfalls Wärme erzeugen und schwer von Gewicht sind. Schließlich liegt ein weiterer Nachteil darin, daß durch die Notwendigkeit der klappbaren Anordnung der LCD-Anzeigeelemente durch eine Vielzahl von Gehäuseöffnungen Staub in den Gehäuseinnenraum eindringen kann, welcher sich auf den Leuchtstofflampen einerseits und auf den Innenseiten des LCD-Anzeigeelemente andererseits ablagert und zur vorzeitigen Lichtabschwächung führt.Another disadvantage is that the LCD display elements are constantly exposed to UV and heat radiation. This leads to the decomposition and destruction of the dyes within the LCD display elements, so that they have to be replaced after a long period of use. A further disadvantage is that the fluorescent lamps must be associated with electrical installation devices inside the housing or on the rear thereof, which also generate heat and are heavy in weight. Finally, there is a further disadvantage that the necessity of the foldable arrangement of the LCD display elements through a large number of housing openings allows dust to penetrate into the interior of the housing, which is deposited on the fluorescent lamps on the one hand and on the inside of the LCD display elements on the other and for premature light attenuation leads.

Der Erfindung liegt von daher die Aufgabe zugrunde, eine elektro-optische Flachanzeigeeinrichtung, insbesondere eine LCD-Anzeigetafel, der gattungsgemäßen Art dahingehend zu verbessern, daß die Beleuchtungseinrichtung erheblich ver­einfacht wird, um so eine kompaktere Flachanzeigeeinrich­tung zu erzielen, deren Anzeigeelemente weder durch UV- und Wärme-Strahlung noch durch Staubanfall beansprucht werden, und die besonders wartungsfreundlich ist.The invention is therefore based on the object of improving an electro-optical flat display device, in particular an LCD display panel, of the generic type in such a way that the lighting device is considerably simplified in order to achieve a more compact flat display device, the display elements of which are not UV or Heat radiation can still be exposed to dust, and which is particularly easy to maintain.

Die Lösung dieser Aufgabe ergibt sich aus den kennzeichnen­den Merkmalen des Anspruches 1. Erfindungsgemäß erfolgt die rückwärtige Beleuchtung der Anzeigeelemente, insbesondere LCD-Anzeigeelemente, mittels einer der Reihe von Anzeige­elementen zugeordneten, im Inneren des Gehäuses angeord­neten Lichtleitröhre, deren Lichtquelle an einem Ende der Lichtleitröhre, insbesondere außerhalb des Gehäuses, ange­ordnet ist. Die Lichtleitröhre besteht aus lichtdurchlässi­gem Material und ist von einem Reflektor umgeben, so daß die gesamte, von der Lichtquelle ausgehende Lichtstrahlung innerhalb der Lichtleitröhre ständig reflektiert wird und nur durch die Ausschnitte des Reflektors unmittelbar im Bereich der einzelnen Anzeigeelemente austreten kann. Hier­durch wird einerseits eine vollständige Ausnutzung der Lichtstrahlung der Lichtquelle ermöglicht. Andererseits erfolgt keine UV- und Wärme-Strahlungsbelastung der Anzei­geelemente, insbesondere LCD-Anzeigeelemente, ferner ist ein Auswechseln von innerhalb des Gehäuses im Bereich der Anzeigeelemente angeordneten Bauteilen der Beleuchtungsein­richtung nicht mehr erforderlich, so daß die einzelnen An­zeigeelemente fest an der Vorderseite des Gehäuses montiert werden können. Das Gehäuse kann somit staubdicht gekapselt werden. Ferner entfällt jegliche Elektroinstallation inner­halb des Gehäuses. Auch ist eine Lüftungseinrichtung des Gehäuses nicht mehr erforderlich.This object is achieved from the characterizing features of claim 1. According to the invention, the backlighting of the display elements, in particular LCD display elements, takes place by means of a light guide tube which is assigned to the row of display elements and is arranged in the interior of the housing and whose light source is at one end of the light guide tube. in particular outside the housing. The light pipe is made of translucent material and is surrounded by a reflector, so that the entire light radiation emanating from the light source is constantly reflected within the light guide tube and can only emerge directly through the cutouts of the reflector in the area of the individual display elements. On the one hand, this enables full utilization of the light radiation from the light source. On the other hand, there is no UV and heat radiation exposure of the display elements, in particular LCD display elements, and it is no longer necessary to replace components of the lighting device arranged inside the housing in the region of the display elements, so that the individual display elements are firmly mounted on the front of the housing can. The housing can thus be encapsulated in a dust-tight manner. Furthermore, there is no electrical installation inside the housing. A ventilation device of the housing is also no longer required.

In weiterer Ausbildung der Erfindung ist die Lichtquelle am außerhalb des Gehäuses gelegenen Ende der Lichtleitröhre angeordnet, und es sind der Lichtquelle Farb- und Wärme­filter vorgesetzt. Diese Anordnung erhöht einerseits die Wartungsfreundlichkeit der Flachanzeigeeinrichtung und ver­mindert andererseits die Wärmebelastung der Anzeigeelemente im Gehäuse.In a further embodiment of the invention, the light source is arranged at the end of the light guide tube located outside the housing, and color and heat filters are placed in front of the light source. This arrangement on the one hand increases the ease of maintenance of the flat display device and on the other hand reduces the thermal load on the display elements in the housing.

Schließlich können bei Anordnung mehrerer Reihen von Anzei­geelementen übereinander, denen jeweils eine Lichtleitröhre zugeordnet ist, in den dazwischen gebildeten Gehäuse-­Freiräumen die elektronischen Bauelemente für die Steuerung der LCD-Anzeigeelemente angeordnet werden.Finally, if several rows of display elements are arranged one above the other, each of which is assigned a light guide tube, the electronic components for controlling the LCD display elements can be arranged in the housing spaces formed between them.

Lichtleitröhren sind an sich z.B. aus der DE 34 30 191 be­kannt. Diese dienen jedoch ausschließlich als Leuchtkörper für die Raumbeleuchtung, wohingegen erfindungsgemäß die Verwendung derartiger Lichtleitröhren bei elektro-optischen Flachanzeigeeinrichtungen, insbesondere LCD-Anzeigetafeln, beansprucht wird.Optical tubes are known per se, for example from DE 34 30 191. However, these serve exclusively as luminous elements for room lighting, whereas the use of such light guide tubes in electro-optical flat display devices, in particular LCD display panels, is claimed according to the invention.

Die Erfindung ist nachfolgend anhand eines in den Zeichnun­gen dargestellten Ausführungsbeispieles einer als LCD-­Anzeigetafel ausgebildeten elektro-optischen Flachanzeige­einrichtung näher erläutert. Es zeigen:

  • Fig. 1 eine perspektivische Darstellung der LCD-Anzeige­tafel und
  • Fig. 2 eine perspektivische Schnittdarstellung der LCD-­Anzeigetafel.
The invention is explained in more detail below on the basis of an exemplary embodiment shown in the drawings of an electro-optical flat display device designed as an LCD display panel. Show it:
  • Fig. 1 is a perspective view of the LCD panel and
  • Fig. 2 is a perspective sectional view of the LCD display panel.

Die LCD-Anzeigetafel besteht aus einem flachen Gehäuse 1 mit Rückwand 2, Deckwand 3, Bodenwand 4, Seitenwänden 5 und mit Zwischenwänden 6, die sich zwischen den Seitenwänden 5 parallel zu Deckwand 3 und Bodenwand 4 erstrecken und die einzelne Kammern 7 bilden. Die Vorderseite 8 des Gehäuses wird im wesentlichen durch Reihen 9 von LCD-Anzeigeelemen­ten 10 gebildet, die im Ausführungsbeispiel als bekannte 7-Segmente-Anzeigeelemente ausgebildet sind. Anstelle der 7-Segmente-Anzeigeelemente können auch 3x5-Matrixelemente oder dergleichen verwendet werden. Der Aufbau derartiger LCD-Anzeigeelemente ist in der EP 0.146.285 näher beschrie­ben. Die LCD-Anzeigeelemente 10 sind von sich auf der Vorderseite 8 längs erstreckenden Profilen 11 aufgenommen, die an der Deckwand 3 und der Bodenwand 4 sowie an den Zwischenwänden 6 befestigt sind. Die den einzelnen LCD-­Anzeigeelementen 10 zugeordneten Elektronikbauteile 23 sind an den Zwischenwänden 6 montiert. Auf der Innenseite sind den LCD-Anzeigeelementen 10 Streuscheiben 24 zugeordnet. Das gesamte Gehäuse 1 ist staubdicht verkapselt.The LCD display panel consists of a flat housing 1 with rear wall 2, top wall 3, bottom wall 4, side walls 5 and with partition walls 6 which extend between the side walls 5 parallel to top wall 3 and bottom wall 4 and form the individual chambers 7. The front 8 of the housing is essentially formed by rows 9 of LCD display elements 10, which in the exemplary embodiment are designed as known 7-segment display elements. Instead of the 7-segment display elements, 3x5 matrix elements or the like can also be used. The structure of such LCD display elements is described in more detail in EP 0.146.285. The LCD display elements 10 are accommodated by profiles 11 which extend longitudinally on the front side 8 and which are fastened to the top wall 3 and the bottom wall 4 and to the intermediate walls 6. The electronic components 23 assigned to the individual LCD display elements 10 are mounted on the intermediate walls 6. On the inside, the LCD display elements 10 are assigned to diffusers 24. The entire housing 1 is encapsulated in a dust-tight manner.

Innerhalb der einzelnen Kammern 7 des Gehäuses 1 sind Lichtleitröhren 12 angeordnet, die im Ausführungsbeispiel U-förmig ausgebildet sind, wobei die offene Seite der U-Form durch eine streifenförmige Wand 13 gebildet ist.Light guide tubes 12 are arranged within the individual chambers 7 of the housing 1, which are U-shaped in the exemplary embodiment, the open side of the U-shape being formed by a strip-shaped wall 13.

Die Lichtleitröhren 12 und die U-förmig abschließenden Wände 13 sind von Reflektionsmaterial 14 umgeben, das nur im Bereich der LCD-Anzeigeelemente 10 Ausschnitte 15 aufweist, die als Lichtaustrittsöffnungen dienen und deren Flächenabmessung genau denjenigen der zu beleuchtenden LCD-­Anzeigeelemente 10 entspricht und diesen zugeordnet ist. Innerhalb der Lichtleitröhren 12 sind noch im rückwärtigen Krümmungsbereich der U-Form Konzentratoren 16 gelagert, welche das in den Lichtleitröhren 10 ständig total reflektierte Licht auf die gegenüberliegenden Ausschnitte 15 des Reflektormaterials 14 richten.The light guide tubes 12 and the U-shaped closing walls 13 are surrounded by reflection material 14, which has cutouts 15 only in the area of the LCD display elements 10, which serve as light exit openings and whose surface dimensions correspond exactly to those of the LCD display elements 10 to be illuminated and are assigned to them is. Within the light guide tubes 12, concentrators 16 are still mounted in the rear curvature area of the U-shape, which direct the light that is totally totally reflected in the light guide tubes 10 onto the opposite cutouts 15 of the reflector material 14.

Jede Lichtleitröhre 12 ist an eine außerhalb des Gehäuses 1 liegende Lichtleitröhre 17 angeschlossen, welche an ihrem einen Ende eine Lichtquelle 18 aufweist, welche ihre gesam­te Lichtstrahlung mittels eines geeigneten Reflektors 25 in die Lichtleitröhre 17 einleitet. An den Abwinklungen der Lichtleitröhre 17 und an den Einrittsstellen der Lichtleit­röhren 12 sind Umlenkspiegel 19,20 angeordnet, wobei die Umlenkspiegel 19 die gesamte, zugeleitete Lichtstrahlung und die Umlenkspiegel 20 nur jeweils eine Teilstrahlung in die jeweilige Lichtleitröhre 17 bzw. 12 umlenken. Schließ­lich sind der Lichtquelle 18 ein als Glasscheibe ausgebil­detes Wärmefilter 21 und ein Farbfilter 22 vorgeschaltet, das als elektrisch steuerbares, doppelbrechendes Farbfilter in Flüssigkristalltechnologie (ECB-LC-Filter) ausgebildet ist.Each light guide tube 12 is connected to a light guide tube 17 lying outside the housing 1, which has at one end a light source 18 which introduces all of its light radiation into the light guide tube 17 by means of a suitable reflector 25. Deflecting mirrors 19, 20 are arranged at the bends of the light guide tube 17 and at the entry points of the light guide tubes 12, the deflecting mirrors 19 deflecting all of the light radiation supplied and the deflecting mirrors 20 deflecting only partial radiation into the respective light guide tubes 17 and 12, respectively. Finally, the light source 18 is preceded by a heat filter 21 in the form of a glass pane and a color filter 22 which is in the form of an electrically controllable, birefringent color filter in liquid crystal technology (ECB-LC filter).

Die von der Lichtquelle 18 ausgehende Lichtstrahlung wird nach Durchtritt durch das Farbfilter 22 und das Wärmefilter 21 über die Lichtleitröhre 17 und die Umlenkspiegel 19,20 total in die einzelnen Lichtleitröhren 12 eingeleitet. Hier erfolgt eine ständige Totalreflektion der eingeleiteten Lichtstrahlung an den Wänden der Lichtleitröhren 12, ein­schließlich den diesen zugeordneten flachen Wänden 13.After passing through the color filter 22 and the heat filter 21, the light radiation emanating from the light source 18 is totally introduced into the individual light guide tubes 12 via the light guide tube 17 and the deflecting mirror 19, 20. Here there is a constant total reflection of the introduced light radiation on the walls of the light guide tubes 12, including the flat walls 13 assigned to them.

Am der Lichtquelle 18 entgegengesetzten Ende sind in nicht naher dargestellter Weise noch zusätzliche Spiegel zur weitgehend verlustfreien Reflektion der Lichtstrahlung an­geordnet. Die innerhalb der Lichtleitröhren 12 somit stän­dig total reflektierte Lichtstrahlung kann nur durch die Lichtaustrittsöffnungen 15 austreten, welche den jeweiligen LCD-Anzeigeelementen 10 zugeordnet sind. Mittels der Kon­zentratoren 16 wird die Intensität der hier austretenden Lichtstrahlung noch erhöht.Additional mirrors for largely lossless reflection of the light radiation are arranged at the end opposite the light source 18 in a manner not shown in detail. The light radiation which is thus totally totally reflected within the light guide tubes 12 can only emerge through the light exit openings 15 which are assigned to the respective LCD display elements 10. The intensity of the light radiation emerging here is further increased by means of the concentrators 16.

Als Material für die Lichtleitröhre 12 und die diese ab­schließende Wand 13 dient eine an sich bekannte Reflek­tionsfolie. In besonders bevorzugter Weise wird eine Reflektionsfolie verwendet, welche in der DE 34 30 191 A1 am Beispiel eines Leuchtkörpers mit prismatischer Licht­führung zur Raumbeleuchtung näher erläutert ist. Hierbei dient eine spezielle Gestaltung der Außenkontur der Licht­leitfolie der Totalreflektion der Lichtstrahlung innerhalb einer Lichtleitröhre 12, wobei ein Austritt der Strahlung nur innerhalb der Ausschnitte 15 möglich ist.A material known per se is used as the material for the light guide tube 12 and the wall 13 closing it. In a particularly preferred manner, a reflection film is used, which is described in DE 34 30 191 A1 using the example of a luminous element with a prismatic light guide for room lighting. Here, a special design of the outer contour of the light-guiding film serves for total reflection of the light radiation within a light-guiding tube 12, with the radiation only being able to exit within the cutouts 15.

BEZUGSZEICHENLISTEREFERENCE SIGN LIST

  • 1 Gehäuse1 housing
  • 2 Rückwand2 rear wall
  • 3 Deckwand3 top wall
  • 4 Bodenwand4 bottom wall
  • 5 Seitenwand5 side wall
  • 6 Zwischenwand6 partition
  • 7 Kammer7 chamber
  • 8 Vorderseite8 front
  • 9 Reihe9 row
  • 10 LCD-Anzeigeelement10 LCD display element
  • 11 Profil11 profile
  • 12 Lichtleitröhre12 light pipe
  • 13 Wand13 wall
  • 14 Reflektormaterial14 reflector material
  • 15 Ausschnitt15 cutout
  • 16 Konzentrator16 concentrator
  • 17 Lichtleitröhre17 light pipe
  • 18 Lichtquelle18 light source
  • 19,20 Umlenkspiegel19.20 deflecting mirror
  • 21 Wärmefilter21 heat filters
  • 22 Farbfilter22 color filters
  • 23 Elektronik-Bauelemente23 electronic components
  • 24 Streuscheibe24 lens
  • 25 Reflektor25 reflector

Claims (7)

1. Elektro-optische Flachanzeigeeinrichtung, insbesondere LCD-Anzeigetafel, aus einem flachen Gehäuse mit mindestens einer die Vorderseite des Gehäuses bildenden Reihe von Anzeigeelementen und mit einer im Inneren des Gehäuses angeordneten, der Reihe von Anzeigeelementen zugeordneten Beleuchtungseinrichtung,
dadurch gekennzeichnet,
daß die Beleuchtungseinrichtung aus einer im Inneren des Gehäuses (1) angeordneten Lichtleitröhre (12,17) und aus einer an einer Lichteintrittsöffnung der Lichtleitröhre (12,17) angeordneten Lichtquelle (18) gebildet ist, daß die Lichtleitröhre (12) aus lichtdurchlässigem Material besteht und von einem Reflektormaterial (14) umgeben ist und
daß das Reflektormaterial (14) den einzelnen Anzeigeelementen (10) zugeordnete Ausschnitte (15) als Lichtaustrittsöffnungen aufweist.1. Electro-optical flat display device, in particular LCD display panel, consisting of a flat housing with at least one row of display elements forming the front of the housing and with a lighting device arranged in the interior of the housing and associated with the row of display elements,
characterized by
that the lighting device is formed from a light guide tube (12, 17) arranged in the interior of the housing (1) and from a light source (18) arranged at a light entry opening of the light guide tube (12, 17), that the light guide tube (12) consists of translucent material and is surrounded by a reflector material (14) and
that the reflector material (14) has cutouts (15) assigned to the individual display elements (10) as light exit openings. 2. Elektro-optische Flachanzeigeeinrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Lichtquelle (18) am außerhalb des Gehäuses (1) gelegenen Ende der Lichtleitröhre (12,17) angeordnet ist.2. Electro-optical flat display device according to claim 1,
characterized by
that the light source (18) is arranged on the outside of the housing (1) end of the light guide tube (12, 17). 3. Elektro-optische Flachanzeigeeinrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß der Lichtquelle (18) ein Wärmefilter (21) und ein Farbfilter (22) zugeordnet sind.3. Electro-optical flat display device according to claim 1 or 2,
characterized by
that the light source (18) is assigned a heat filter (21) and a color filter (22). 4. Elektro-optische Flachanzeigeeinrichtung nach Anspruch 3,
dadurch gekennzeichnet,
daß das Wärmefilter (21) aus einer Glasscheibe gebildet ist.4. Electro-optical flat display device according to claim 3,
characterized by
that the heat filter (21) is formed from a glass sheet. 5. Elektro-optische Flachanzeigeeinrichtung nach Anspruch 3,
dadurch gekennzeichnet,
daß das Farbfilter (22) aus einem elektrisch steuerbaren, doppelbrechenden Farbfilter in Flüssigkristalltechnologie (ECB-LC-Filter) gebildet ist.5. Electro-optical flat display device according to claim 3,
characterized by
that the color filter (22) is formed from an electrically controllable, birefringent color filter in liquid crystal technology (ECB-LC filter). 6. Elektro-optische Flachanzeigeeinrichtung nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß die Anzeigeelemente (10) als LCD-Flüssigkristall­elemente ausgebildet sind.6. Electro-optical flat display device according to one of claims 1 to 5,
characterized by
that the display elements (10) are designed as LCD liquid crystal elements. 7. Elektro-optische Flachanzeigeeinrichtung nach Anspruch 6,
dadurch gekennzeichnet,
daß mehrere Reihen von LCD-Anzeigeelementen (10) mit jeweils einer zugeordneten Lichtleitröhre (12) innerhalb des Gehäuses angeordnet sind und
daß die den LCD-Anzeigeelementen (10) zugeordneten Elektronik-Bauelemente (B) zwischen den Lichtleitröhren (12) angeordnet sind.7. electro-optical flat display device according to claim 6,
characterized by
that several rows of LCD display elements (10), each with an associated light guide tube (12) are arranged within the housing and
that the electronics components (B) assigned to the LCD display elements (10) are arranged between the light guide tubes (12).
EP89730208A 1988-12-16 1989-10-14 Electro-optical planar display, in particular an lcd display panel Expired - Lifetime EP0374085B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89730208T ATE94674T1 (en) 1988-12-16 1989-10-14 ELECTRO-OPTICAL FLAT DISPLAY DEVICE, IN PARTICULAR LCD DISPLAY PANEL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3842900 1988-12-16
DE3842900A DE3842900C1 (en) 1988-12-16 1988-12-16

Publications (3)

Publication Number Publication Date
EP0374085A2 true EP0374085A2 (en) 1990-06-20
EP0374085A3 EP0374085A3 (en) 1990-12-05
EP0374085B1 EP0374085B1 (en) 1993-09-15

Family

ID=6369639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89730208A Expired - Lifetime EP0374085B1 (en) 1988-12-16 1989-10-14 Electro-optical planar display, in particular an lcd display panel

Country Status (15)

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US (1) US5044734A (en)
EP (1) EP0374085B1 (en)
JP (1) JPH02238486A (en)
AT (1) ATE94674T1 (en)
AU (1) AU628427B2 (en)
BR (1) BR8906533A (en)
CA (1) CA2005792A1 (en)
DE (2) DE3842900C1 (en)
DK (1) DK638589A (en)
FI (1) FI896040A7 (en)
NO (1) NO894627L (en)
NZ (1) NZ231200A (en)
PT (1) PT92593B (en)
TR (1) TR24389A (en)
ZA (1) ZA899605B (en)

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Also Published As

Publication number Publication date
AU628427B2 (en) 1992-09-17
JPH02238486A (en) 1990-09-20
NZ231200A (en) 1991-12-23
DK638589A (en) 1990-06-17
FI896040A7 (en) 1990-06-17
ZA899605B (en) 1990-09-26
AU4553989A (en) 1990-06-21
EP0374085B1 (en) 1993-09-15
EP0374085A3 (en) 1990-12-05
DE3842900C1 (en) 1990-05-10
CA2005792A1 (en) 1990-06-16
NO894627D0 (en) 1989-11-21
BR8906533A (en) 1990-08-28
PT92593A (en) 1990-06-29
ATE94674T1 (en) 1993-10-15
NO894627L (en) 1990-06-18
DK638589D0 (en) 1989-12-15
TR24389A (en) 1991-09-24
DE58905624D1 (en) 1993-10-21
PT92593B (en) 1995-09-12
US5044734A (en) 1991-09-03
FI896040A0 (en) 1989-12-15

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