DE3935842A1 - Large liquid crystal display device - uses thermal conductors to transfer heat from back light to rear wall of display housing - Google Patents

Large liquid crystal display device - uses thermal conductors to transfer heat from back light to rear wall of display housing

Info

Publication number
DE3935842A1
DE3935842A1 DE3935842A DE3935842A DE3935842A1 DE 3935842 A1 DE3935842 A1 DE 3935842A1 DE 3935842 A DE3935842 A DE 3935842A DE 3935842 A DE3935842 A DE 3935842A DE 3935842 A1 DE3935842 A1 DE 3935842A1
Authority
DE
Germany
Prior art keywords
display device
rear wall
lamp housing
liquid crystal
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE3935842A
Other languages
German (de)
Inventor
Wolfram Dr Wiemer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE3935842A priority Critical patent/DE3935842A1/en
Publication of DE3935842A1 publication Critical patent/DE3935842A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • 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
    • G09F9/307—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 incandescent filaments
    • 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
    • G02F1/133628—Illuminating devices with cooling means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The display device comprising electric light source (3) and display unit (1) in a housing (2). In partic., the housing contains heat conductor devices (6,7) which connect the light source (3) to the rear wall (5) of the housing (2) ensuring good thermal contact. Pref., the display (1) is a liq. crystal device, and the light source (3) cylindrical fluorescent lamp. The rear wall (5) of housing, conductors (6,7) and grip (4) of light source (3) should be metallic to provide good thermal conductivity. USE/ADVANTAGE - Large display devices for airports/railway stations. Increased reliability of electric circuitry.

Description

Die vorliegende Erfindung betrifft eine Darstellungsvor­ richtung nach dem Oberbegriff des Patentanspruchs 1.The present invention relates to an illustration Direction according to the preamble of claim 1.

Darstellungsvorrichtung der vorgenannten Art werden zur großflächigen optischen Information z. B. in Bahnhöfen, auf Flugplätzen, in Börsen und dergleichen verwendet. Trans­ missiv betreibbare Flüssigkristallanzeigen sind in bekann­ ter Weise elektrisch ansteuerbare optische Schalter zur Darstellung von Buchstaben, Zahlen, Symbolen oder derglei­ chen. Sie werden von hinten mit Lichtquellen beleuchtet und bilden gewissermaßen einen Deckel eines hinter der An­ zeigeeinheit befindlichen Lampengehäuses. Zur Erzielung einer ausreichenden Erkennbarkeit sind insbesondere bei großflächigen Anzeigetafeln größere Lichtleistungen erforderlich. Dabei entsteht selbst bei Verwendung von Leuchtstofflampen eine beachtliche Wärme­ menge, die die Lebensdauer der Flüssigkristallplatte, die außer den eigentlichen Flüssigkristall-Anzeigezellen auch elektronische Schaltkreise usw. beinhaltet, beeinträchti­ gen kann, und die die Funktion zusätzlicher im Lampenge­ häuse befindlicher Elektronik beeinflußt.Representation device of the aforementioned type are used large-area optical information such. B. in train stations Airfields, used in exchanges and the like. Trans liquid crystal displays which can be operated in a negative manner are known in ter way electrically controllable optical switches for Representation of letters, numbers, symbols or the like chen. They are illuminated from behind with light sources and so to speak form a cover one behind the other Show unit located lamp housing. To achieve are sufficiently recognizable  Larger especially with large-scale display boards Light outputs required. This creates itself with Use of fluorescent lamps a considerable amount of heat amount, the life of the liquid crystal panel, the in addition to the actual liquid crystal display cells includes electronic circuits, etc. gen, and which the function of additional in the lamp set electronics located in the house.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, bei einer Darstellungsvorrichtung der eingangs genannten Art, die durch die Lichtquellen verursachte Wärmeeinwirkung auf die Anzeigeplatte und die Elektronik zu verringern.The present invention is based on the object a display device of the type mentioned at the beginning, the heat caused by the light sources to reduce the display panel and electronics.

Diese Aufgabe wird durch die im Kennzeichen des Pa­ tentanspruches 1 angegebenen Merkmale gelöst.This task is carried out by the Pa Tent claim 1 specified features solved.

Durch die beschriebenen Wärmeableitvorrichtungen wird ein erheblicher Anteil der von den Lichtquellen erzeugten Wärme auf die Rückwand und von dieser an die Umgebungsluft abgeführt. Es wird dadurch nicht nur die Gefahr eines stö­ renden Hitzestaus im Lampengehäuse verringert, sondern es wird auch die direkte Wärmestrahlung von den Lichtquellen auf die Flüssigkristallplatte verringert. Die Lebens­ dauererwartung und Zuverlässigkeit der Anzeigetafel und der Elektronik wird dadurch beachtlich verbessert.Due to the described heat dissipation devices considerable proportion of those generated by the light sources Heat on the rear wall and from there to the ambient air dissipated. This not only eliminates the risk of disruption heat build-up in the lamp housing is reduced, but it is also the direct heat radiation from the light sources reduced to the liquid crystal panel. The life long-term expectation and reliability of the scoreboard and this considerably improves the electronics.

Anhand des in der Figur schematisch dargestellten Ausfüh­ rungsbeispiels wird die Erfindung nachfolgend näher erläu­ tert. Based on the embodiment shown schematically in the figure Example, the invention is explained in more detail below tert.  

Die Darstellungsvorrichtung besteht im wesentlichen aus einem kastenförmigen Gehäuse 2 und einer Flüssigkristall­ platte 1, die die offene Seite des Lampengehäuses 2 ab­ deckt. Die Flüssigkristallplatte besteht, in an sich be­ kannter Weise, aus einer Vielzahl von Flüssigkristallzel­ len sowie den dazu gehörigen elektrischen bzw. elektroni­ schen Schaltkreisen 9, die bevorzugt auf den Flüssigkri­ stallanzeigezellen z. B. in sogenannter chip on glass-Tech­ nik aufgebracht sind. Entsprechend elektrisch angesteuert wird erreicht, daß Zeichen darstellende Teilflächen der Anzeigeplatte 1, das Licht der Lichtquelle 3 hindurchlas­ sen oder nicht.The display device consists essentially of a box-shaped housing 2 and a liquid crystal plate 1 , which covers the open side of the lamp housing 2 from. The liquid crystal panel consists, in a manner known per se, of a plurality of liquid crystal cells and the associated electrical or electronic circuits 9 , which are preferably installed on the liquid crystal display cells e.g. B. are applied in so-called chip on glass technology. Correspondingly electrically controlled it is achieved that character-representing partial areas of the display panel 1 , the light from the light source 3 pass or not.

Als Lichtquellen 3 dienen bevorzugt Leuchtstofflampen, de­ ren Wärmeentwicklung vergleichsweise gering ist. Trotzdem tritt auch bei solchen Leuchtstofflampen eine nicht zu verachtende Wärmemenge auf, die wegen der im allgemeinen reflektierenden Oberflächenbeschaffenheit des Inneres des Lampengehäuses in Richtung der Anzeigetafel 1 gestrahlt wird und diese in unerwünschter Weise aufheizt.Fluorescent lamps are preferably used as light sources 3 , the heat development of which is comparatively low. Nevertheless, an amount of heat that is not to be despised also occurs with such fluorescent lamps, which is radiated in the direction of the display panel 1 because of the generally reflective surface texture of the interior of the lamp housing and heats it up in an undesirable manner.

Durch wärmeleitende Vorrichtungen, die beim dargestellten Ausführungsbeispiel klammerartige Metallfedern 6 und 7 sind, wird nun dafür gesorgt, daß die in der Lichtquelle 3 entstehenden Wärme möglichst direkt auf die Rückwand 5 des Lampengehäuses abgeleitet wird. Die Klammern 6 und 7 sind z. B. durch Nieten 8 oder Schweißstellen fest mit der Rück­ wand 5 verbunden und kontaktieren die Lichtquelle 3 mög­ lichst großflächig.By means of heat-conducting devices, which are clip-like metal springs 6 and 7 in the exemplary embodiment shown, it is now ensured that the heat generated in the light source 3 is dissipated as directly as possible to the rear wall 5 of the lamp housing. The brackets 6 and 7 are e.g. B. by rivets 8 or welds firmly connected to the rear wall 5 and contact the light source 3 as large as possible.

Die Lichtquellen sind bevorzugt rohrförmige Leucht­ stofflampen, die an ihren Enden metallene Hülsenabschnitte 4 aufweisen. Bevorzugt erfolgt die Wärmeableitung über die Klammern 6 und 7 in diesen Hülsenbereichen. Die Lebens­ dauer und Zuverlässigkeit von Darstellungsvorrichtungen mit Flüssigkristall-Anzeigeplatten der genannten Art, konnten durch die wärmeableitenden Vorrichtungen beacht­ lich gesteigert werden. Die Klammern 6 und 7 eignen sich auch dazu, die Lichtquellen 3 in gewünschter Position zu haltern.The light sources are preferably tubular fluorescent lamps which have metal sleeve sections 4 at their ends. Heat is preferably dissipated via the clips 6 and 7 in these sleeve areas. The life and reliability of display devices with liquid crystal display panels of the type mentioned, could be increased significantly by the heat-dissipating devices. The brackets 6 and 7 are also suitable for holding the light sources 3 in the desired position.

Claims (8)

1. Darstellungsvorrichtung mit einem elektrische Licht­ quellen aufweisenden Lampengehäuse und einer transmissiv betreibbaren Anzeigeeinheit, dadurch gekennzeichnet, daß im Lampengehäuse (2) Wärmeableitvorrichtungen (6, 7) vor­ gesehen sind, die einerseits mit den Lichtquellen (3) und andererseits mit der Rückwand (5) des Lampengehäuses (2) in gut wärmeleitenden Kontakt stehen.1. Display device with an electrical light source having a lamp housing and a transmissively operated display unit, characterized in that in the lamp housing ( 2 ) heat dissipation devices ( 6 , 7 ) are seen before, on the one hand with the light sources ( 3 ) and on the other hand with the rear wall ( 5 ) of the lamp housing ( 2 ) are in good heat-conducting contact. 2. Darstellungsvorrichtung nach Anspruch 1, dadurch ge­ kennzeichnet, daß die Anzeigeeinheit (1) eine Flüssigkri­ stallanzeigeplatte ist.2. Display device according to claim 1, characterized in that the display unit ( 1 ) is a liquid crystal stall display plate. 3. Darstellungsvorrichtung nach Anspruch 1 oder 2, da­ durch gekennzeichnet, daß die Lichtquellen (3) Leucht­ stofflampen, insbesondere in Rohrform sind. 3. Display device according to claim 1 or 2, characterized in that the light sources ( 3 ) fluorescent lamps, in particular in tubular form. 4. Darstellungsvorrichtung nach Anspruch 3, dadurch ge­ kennzeichnet, daß die Lichtquellen gut wärmeleitende, ins­ besondere metallene Hülsenteile (4) aufweisen,die mit den Wärmeableitvorrichtungen (6, 7) in gut wärmeleitendem Kontakt stehen.4. Display device according to claim 3, characterized in that the light sources have good heat-conducting, in particular metallic sleeve parts ( 4 ) which are in good heat-conducting contact with the heat dissipation devices ( 6 , 7 ). 5. Darstellungsvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Wärmeableitvorrichtun­ gen (6, 7) als metallene Haltefedern für die Lichtquellen (3) ausgebildet sind.5. Representation device according to one of claims 1 to 4, characterized in that the Wärmeableitvorrichtun gene ( 6 , 7 ) are designed as metal retaining springs for the light sources ( 3 ). 6. Darstellungsvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Rückwand (5) zumindest im Kontaktbereich mit den Wärmeableitvorrichtungen (6, 7) gut wärmeleitend ausgebildet ist, insbesondere aus Metall besteht.6. Display device according to one of claims 1 to 5, characterized in that the rear wall ( 5 ) is at least in the contact area with the heat dissipation devices ( 6 , 7 ) is well heat-conductive, in particular made of metal. 7. Darstellungsvorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Außenfläche zumindest der Rückwand (5 ) des Lampengehäuses (2) eine wärmeabge­ bende Oberflächenbeschaffenheit aufweist.7. Display device according to one of claims 1 to 6, characterized in that the outer surface of at least the rear wall ( 5 ) of the lamp housing ( 2 ) has a warmth-giving surface quality. 8. Darstellungsvorrichtung nach einem der Ansprüche 1-7, dadurch gekennzeichnet, daß in dem Lampengehäuse (2), ins­ besondere auf der Anzeigeeinheit (1) elektronische Schal­ tungen (9), wie z. B. IC′s angeordnet sind.8. Display device according to one of claims 1-7, characterized in that in the lamp housing ( 2 ), in particular on the display unit ( 1 ) electronic scarf lines ( 9 ), such as. B. IC's are arranged.
DE3935842A 1989-10-27 1989-10-27 Large liquid crystal display device - uses thermal conductors to transfer heat from back light to rear wall of display housing Withdrawn DE3935842A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE3935842A DE3935842A1 (en) 1989-10-27 1989-10-27 Large liquid crystal display device - uses thermal conductors to transfer heat from back light to rear wall of display housing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3935842A DE3935842A1 (en) 1989-10-27 1989-10-27 Large liquid crystal display device - uses thermal conductors to transfer heat from back light to rear wall of display housing

Publications (1)

Publication Number Publication Date
DE3935842A1 true DE3935842A1 (en) 1991-05-08

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DE3935842A Withdrawn DE3935842A1 (en) 1989-10-27 1989-10-27 Large liquid crystal display device - uses thermal conductors to transfer heat from back light to rear wall of display housing

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003059249A2 (en) * 2002-01-16 2003-07-24 Metabolic Engineering Laboratories Co., Ltd. Nivalenol as specific inhibitor to transcriptional factor c-maf and pharmaceutical compositions comprising the same
WO2003102680A1 (en) * 2002-05-31 2003-12-11 Samsung Electronics Co., Ltd. Backlight assembly and liquid crystal display apparatus having the same
WO2004081636A2 (en) * 2003-03-10 2004-09-23 Samsung Electronics Co., Ltd. Liquid crystal display apparatus
DE112012006028B4 (en) * 2012-03-13 2020-08-13 Shenzhen China Star Optoelectronics Technology Co., Ltd. Backlight module

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003059249A2 (en) * 2002-01-16 2003-07-24 Metabolic Engineering Laboratories Co., Ltd. Nivalenol as specific inhibitor to transcriptional factor c-maf and pharmaceutical compositions comprising the same
WO2003059249A3 (en) * 2002-01-16 2003-11-27 Metabolic Engineering Lab Co L Nivalenol as specific inhibitor to transcriptional factor c-maf and pharmaceutical compositions comprising the same
WO2003102680A1 (en) * 2002-05-31 2003-12-11 Samsung Electronics Co., Ltd. Backlight assembly and liquid crystal display apparatus having the same
US7086761B2 (en) 2002-05-31 2006-08-08 Samsung Electronics Co., Ltd. Backlight assembly and liquid crystal display apparatus having the same
CN100409074C (en) * 2002-05-31 2008-08-06 三星电子株式会社 Backlight assembly and liquid crystal display apparatus having the same
WO2004081636A2 (en) * 2003-03-10 2004-09-23 Samsung Electronics Co., Ltd. Liquid crystal display apparatus
WO2004081636A3 (en) * 2003-03-10 2005-01-06 Samsung Electronics Co Ltd Liquid crystal display apparatus
US7341370B2 (en) 2003-03-10 2008-03-11 Samsung Electronics Co., Ltd. Liquid crystal display apparatus
CN100405203C (en) * 2003-03-10 2008-07-23 三星电子株式会社 Liquid crystal display apparatus
DE112012006028B4 (en) * 2012-03-13 2020-08-13 Shenzhen China Star Optoelectronics Technology Co., Ltd. Backlight module

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