DE29514630U1 - Flat screen - Google Patents

Flat screen

Info

Publication number
DE29514630U1
DE29514630U1 DE29514630U DE29514630U DE29514630U1 DE 29514630 U1 DE29514630 U1 DE 29514630U1 DE 29514630 U DE29514630 U DE 29514630U DE 29514630 U DE29514630 U DE 29514630U DE 29514630 U1 DE29514630 U1 DE 29514630U1
Authority
DE
Germany
Prior art keywords
flat screen
fluorescent tube
screen according
flat
lcd matrix
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 - Lifetime
Application number
DE29514630U
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE29514630U priority Critical patent/DE29514630U1/en
Publication of DE29514630U1 publication Critical patent/DE29514630U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G02F1/133382—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
    • G02F1/133385—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 with cooling means, e.g. fans
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/007—Incandescent lamp or gas discharge lamp
    • G02B6/0071—Incandescent lamp or gas discharge lamp with elongated shape, e.g. tube

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)
  • Dry Shavers And Clippers (AREA)
  • Glass Compositions (AREA)
  • Photoreceptors In Electrophotography (AREA)

Description

GR 95 G 4443 DEGR 95 G 4443 DE

Beschreibung
FlachbildschirmDescription
Flat screen

Flachbildschirme mit einer LCD-Matrix werden wegen ihrer flachen und somit platzsparenden Bauweise und wegen ihres geringen Energieverbrauchs in zunehmendem Maße als Ersatz für Bildschirmröhren eingesetzt. Der entscheidende Nachteil der sich gegenwärtig auf dem Markt befindlichen Flachbildschirme liegt jedoch in der geringen Helligkeit der Bildschirmanzeige, die es nahezu unmöglich macht, mit den bekannten Flachbildschirmen bei Tageslicht zu arbeiten.Flat screens with an LCD matrix are increasingly being used as a replacement for tubes due to their flat and therefore space-saving design and their low energy consumption. The main disadvantage of the flat screens currently on the market, however, is the low brightness of the screen display, which makes it almost impossible to work with the familiar flat screens in daylight.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Flachbildschirm anzugeben, der sich durch eine große Helligkeit auszeichnet.The invention is therefore based on the object of specifying a flat screen that is characterized by high brightness.

Gemäß der Erfindung wird die Aufgabe durch die Merkmale des Anspruchs 1 gelöst.
20According to the invention, the object is solved by the features of claim 1.
20

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous further developments of the invention are specified in the subclaims.

Mittels der Leuchtstoffröhre hinter der LCD-Matrix wird eine hohe Helligkeit der Bildschirmanzeige erzielt, die bei Bedarf über ein entsprechendes Vorschaltgerät bis auf Null herab regelbar ist. Bei einer so realisierten Helligkeit von ca. 1000 cd/m2 leuchtet der Bildschirm heller als das Tageslicht . Die von der Leuchtstoffröhre erzeugte Wärme wird über die rückseitige wärmeleitende Vergußmasse und gegebenenfalls einen zusätzlichen Kühlkörper effektiv abgeführt. Um eine gleichmäßige Lichtverteilung über die Fläche der LCD-Matrix zu erreichen, ist zwischen der Leuchtstoffröhre und der LCD-Matrix eine Lichtverteileinrichtung angeordnet, die aus einer Streuscheibe {Diffusorscheibe) und/oder einer Linsenscheibe (Fresnell-Linse) bestehen kann, wobei beide Scheiben folien-The fluorescent tube behind the LCD matrix is used to achieve a high brightness of the screen display, which can be regulated down to zero if required using a suitable ballast. With a brightness of approx. 1000 cd/m 2 achieved in this way, the screen shines brighter than daylight. The heat generated by the fluorescent tube is effectively dissipated via the heat-conducting casting compound on the back and, if necessary, an additional heat sink. In order to achieve an even distribution of light over the surface of the LCD matrix, a light distribution device is arranged between the fluorescent tube and the LCD matrix, which can consist of a diffusion disc (diffuser disc) and/or a lens disc (Fresnel lens), with both discs being film-coated.

GR 95 G 4443 DEGR 95 G 4443 DE

artig ausgebildet sein können. Zusätzlich ist die Leuchtstoffröhre vorzugsweise tnäanderförmig ausgebildet.can be designed in a triangle-like manner. In addition, the fluorescent tube is preferably designed in a triangle-shaped manner.

Zur weiteren Erläuterung der Erfindung wird im folgenden auf die Figuren der Zeichnung Bezug genommen, von denenFor further explanation of the invention, reference is made below to the figures of the drawing, of which

Figur 1 ein Ausführungsbeispiel des erfindungsgemäßen Flachbildschirms in einem seitlichen Schnitt und Figur 2 in einer Draufsicht zeigen.Figure 1 shows an embodiment of the flat screen according to the invention in a side section and Figure 2 in a top view.

Figur 1 zeigt im Querschnitt eine sich senkrecht zur Zeichenebene erstreckende LCD-Matrix 1, die mit ihrer Vorderseite 2 eine Bildschirmanzeige bildet. Auf der Rückseite 3 liegt eine Linsenfolie 4 an, an der wiederum eine Streu- oder Diffusorfolie 5 zur gleichmäßigen Verteilung des von einer dahinterliegenden Leuchtstoffröhre 6 ausgestrahlten Lichts anliegt. Wie Figur 2 zeigt, ist die Leuchtstoffröhre über die Fläche der LCD-Matrix 1 mäanderförmig ausgebildet. Auf der rückwärtigen Seite ist die Leuchtstoffröhre 6 mit einer wärmeleitenden Vergußmasse 7 bedeckt, die der verbesserten Wärmeabfuhr dient. Die Vergußmasse 7 besteht z. B. aus Silikonkautschuk mit einem geeigneten Anteil an Härter. Im Falle des Silikonkautschuks VP7675A mit dem Härter VP7675D der Firma Wacker Chemie hat sich ein Mischungsverhältnis zwischen 1 : 1 und 4 : 1 als günstig herausgestellt. An der Unterseite der Vergußmasse 7 kann zusätzlich ein hier nicht dargestellter Kühlkörper anliegen.Figure 1 shows a cross-section of an LCD matrix 1 extending perpendicularly to the plane of the drawing, which forms a screen display with its front side 2. On the back side 3 there is a lens film 4, to which in turn there is a scattering or diffuser film 5 for evenly distributing the light emitted by a fluorescent tube 6 behind it. As Figure 2 shows, the fluorescent tube is designed in a meandering shape over the surface of the LCD matrix 1. On the rear side, the fluorescent tube 6 is covered with a heat-conducting casting compound 7, which serves to improve heat dissipation. The casting compound 7 consists, for example, of silicone rubber with a suitable proportion of hardener. In the case of the silicone rubber VP7675A with the hardener VP7675D from Wacker Chemie, a mixing ratio between 1:1 and 4:1 has proven to be favorable. A heat sink (not shown here) can also be attached to the underside of the potting compound 7.

Claims (8)

<· GR 95 G 4443 DE &ldquor;. ··· ··· "··* *·* «.* .»,* 3 Schutzansprüche<· GR 95 G 4443 DE &ldquor;. ··· ··· "··* *·* «.* .»,* 3 Protection claims 1. Flachbildschirm, bestehend aus einer LCD-Matrix (1) mit mindestens einer dahinterliegenden Leuchtstoffröhre (6), einer zwischen der Leuchtstoffröhre (6) und der LCD-Matrix (1) liegenden flachen Lichtverteileinrichtung (4, 5) und einer die Leuchtstoffröhre (6) rückseitig abdeckenden, wärmeleitenden Vergußmasse (7).1. Flat screen, consisting of an LCD matrix (1) with at least one fluorescent tube (6) behind it, a flat light distribution device (4, 5) located between the fluorescent tube (6) and the LCD matrix (1) and a heat-conducting casting compound (7) covering the back of the fluorescent tube (6). 2. Flachbildschirm nach Anspruch 1, dadurch gekennzeichnet , daß die Lichtverteileinrichtung eine Streuscheibe (Diffusor) (5) umfaßt.2. Flat screen according to claim 1, characterized in that the light distribution device comprises a diffusing screen (diffuser) (5). 3. Flachbildschirm nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Lichtverteileinrichtung eine Linsenscheibe (4) umfaßt.3. Flat screen according to claim 1 or 2, characterized in that the light distribution device comprises a lens disk (4). 4. Flachbildschirm nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Scheibe (4, 5) folienartig ausgebildet ist.4. Flat screen according to claim 2 or 3, characterized in that the pane (4, 5) is designed like a film. 5. Flachbildschirm nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Leuchtstoffröhre (6) über die Fläche der LCD-Matrix (1) mäanderförmig ausgebildet ist.5. Flat screen according to one of the preceding claims, characterized in that the fluorescent tube (6) is formed in a meandering shape over the surface of the LCD matrix (1). 6. Flachbildschirm nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Vergußmasse (7) ein Zweikomponenten-Silikonkautschuk mit vorzugsweise einem Fünftel Anteil an Härter ist.6. Flat screen according to one of the preceding claims, characterized in that the casting compound (7) is a two-component silicone rubber with preferably one fifth of hardener. 7. Flachbildschirm nach einem der vorangehenden Ansprüche, gekennzeichnet durch einen an der Vergußmasse anliegenden Kühlkörper.7. Flat screen according to one of the preceding claims, characterized by a heat sink resting on the casting compound. 8. Flachbildschirm nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Leuchtstoffröhre8. Flat screen according to one of the preceding claims, characterized in that the fluorescent tube GR 95 G 4443 DEGR 95 G 4443 DE an einem Vorschaltgerät zur Helligkeitseinstellung angeschlossen ist.connected to a ballast for brightness adjustment.
DE29514630U 1995-09-14 1995-09-14 Flat screen Expired - Lifetime DE29514630U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29514630U DE29514630U1 (en) 1995-09-14 1995-09-14 Flat screen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE29514630U DE29514630U1 (en) 1995-09-14 1995-09-14 Flat screen

Publications (1)

Publication Number Publication Date
DE29514630U1 true DE29514630U1 (en) 1995-11-16

Family

ID=8012912

Family Applications (1)

Application Number Title Priority Date Filing Date
DE29514630U Expired - Lifetime DE29514630U1 (en) 1995-09-14 1995-09-14 Flat screen

Country Status (1)

Country Link
DE (1) DE29514630U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0854318A1 (en) * 1997-01-15 1998-07-22 Siemens Aktiengesellschaft Flat panel display

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0854318A1 (en) * 1997-01-15 1998-07-22 Siemens Aktiengesellschaft Flat panel display

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Legal Events

Date Code Title Description
R207 Utility model specification

Effective date: 19960104

R150 Utility model maintained after payment of first maintenance fee after three years

Effective date: 19990125

R151 Utility model maintained after payment of second maintenance fee after six years

Effective date: 20020219

R152 Utility model maintained after payment of third maintenance fee after eight years

Effective date: 20031204

R071 Expiry of right