WO1998044771A2 - Dispositif d'affichage d'images dote d'un systeme de reduction des emissions - Google Patents

Dispositif d'affichage d'images dote d'un systeme de reduction des emissions Download PDF

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Publication number
WO1998044771A2
WO1998044771A2 PCT/IB1998/000287 IB9800287W WO9844771A2 WO 1998044771 A2 WO1998044771 A2 WO 1998044771A2 IB 9800287 W IB9800287 W IB 9800287W WO 9844771 A2 WO9844771 A2 WO 9844771A2
Authority
WO
WIPO (PCT)
Prior art keywords
display device
picture display
emission
conducting material
electrically conducting
Prior art date
Application number
PCT/IB1998/000287
Other languages
English (en)
Other versions
WO1998044771A3 (fr
Inventor
Paul Hendrik Maria Schlatmann
Original Assignee
Koninklijke Philips Electronics N.V.
Philips Ab
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 Koninklijke Philips Electronics N.V., Philips Ab filed Critical Koninklijke Philips Electronics N.V.
Priority to PCT/IB1998/000287 priority Critical patent/WO1998044771A2/fr
Priority to JP10529308A priority patent/JP2000511708A/ja
Publication of WO1998044771A2 publication Critical patent/WO1998044771A2/fr
Publication of WO1998044771A3 publication Critical patent/WO1998044771A3/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/867—Means associated with the outside of the vessel for shielding, e.g. magnetic shields
    • H01J29/868—Screens covering the input or output face of the vessel, e.g. transparent anti-static coatings, X-ray absorbing layers

Definitions

  • the invention relates to a picture display device provided with emission- reducing means which comprise two substantially parallel glass plates enclosing a thermoplastic material and an electrically conducting material.
  • the invention also relates to a shield with emission-reducing means which is suitable for use in a picture display device, which means comprise two substantially parallel glass plates enclosing a thermoplastic material and an electrically conducting material.
  • a device of this type is known from United States patent 4,381,421.
  • This patent describes an electromagnetic shield for an electronic apparatus such as, for example a picture display device.
  • the shield has two glass plates enclosing a metal gauze embedded in polyvinyl butyral (PNB). This gauze projects on the sides and is used for suspending the shield. Due to the presence of the metal gauze, the shield protects the internal part of an electronic apparatus from electromagnetic fields. This is necessary to ensure that neighboring apparatuses are not disturbed.
  • PPB polyvinyl butyral
  • the known picture display device has a considerable drawback.
  • the electromagnetic shield present in this device exhibits the Moire effect. This produces troublesome patterns in the picture.
  • the gauze used is relatively expensive.
  • a picture display device provided with emission-reducing means which comprise two substantially parallel glass plates enclosing a thermoplastic material and an electrically conducting material, which picture display device according to the invention is characterized in that the electrically conducting material is transparent.
  • the electrically conducting material is transparent.
  • the transparent electrically conducting material preferably comprises a layer which is vapor-deposited on one of the glass plates.
  • the vapor-deposited layer is a continuous layer.
  • a layer of this type is easier to provide.
  • the vapor- deposited continuous layer comprises a metal. It has surprisingly been found that such a layer also shields infrared radiation. This embodiment is particularly suitable for use in a plasma display. In operation, this type of display produces strong electromagnetic fields and emits much infrared radiation, which has very detrimental effects on persons in the neighborhood of the display.
  • polyvinyl butyral is present between the glass plates.
  • the glass plates may be secured together with this material by means of heating and vacuum suction.
  • the use of such a layer is an additional advantage when the electrically conducting material is a vapor-deposited layer.
  • Such layers are generally very thin and the PNB provides a good protection of the layer against damage. If the layer is not to be exposed to oxygen, the PVB also provides a satisfactory protection against this oxygen.
  • the conducting material preferably comprises silver and tin oxide. This material has satisfactory electrically conducting properties and is readily available.
  • the emission-reducing means also comprise another conducting part and if this part must be connected in a conducting manner to the conducting material between the glass plates (for example, for forming a Faraday cage), then this connection is preferably formed by means of a metal strip. This strip is partly present between the glass plates where it makes contact with the conducting layer. The projecting part is connected to the rest of the emission-reducing means.
  • the emission-reducing means may partly consist of a shield which comprises two substantially parallel glass plates enclosing a thermoplastic material and an electrically conducting material, the electrically conducting material being transparent.
  • a shield which comprises two substantially parallel glass plates enclosing a thermoplastic material and an electrically conducting material, the electrically conducting material being transparent.
  • Fig. 1 is a diagrammatic longitudinal section of a picture display device with a cathode ray tube, provided with emission-reducing means
  • Fig. 2 is a diagrammatic longitudinal section of a plasma display provided with emission-reducing means
  • Fig. 3 shows a part of a diagrammatic cross-section of an embodiment of emission-reducing means according to the invention
  • Fig. 4 shows a part of a diagrammatic cross-section of an embodiment of emission-reducing means according to the invention, provided with an anti-reflection coating and an anti-static coating, and
  • Fig. 5 is a diagrammatic longitudinal section of a picture display device with a separate shield.
  • Fig. 1 is a diagrammatic longitudinal section of a picture display device with a cathode ray tube, provided with emission-reducing means.
  • This picture display device comprises a cathode ray tube (11) and an emission-reducing shield (1) in a cabinet (3).
  • the cabinet (3) may comprise a conducting coating which, together with the conducting coating in the emission-reducing shield, constitutes the emission-reducing means.
  • These two layers may be interconnected in a conducting manner and constitute a closed space, also called Faraday cage.
  • the interconnection is indicated by reference numeral (12).
  • reference numeral (12) For the sake of clarity, all components which are not relevant in this case have been omitted.
  • Fig. 2 is a diagrammatic longitudinal section of a plasma display provided with emission-reducing means.
  • This display comprises a plasma display panel (2) and an emission-reducing shield (1) accommodated in a cabinet (3).
  • the cabinet (3) may comprise a conducting coating which, together with a conducting coating in the emission-reducing shield, constitutes the emission-reducing means.
  • These two layers may be interconnected in a conducting manner and constitute a closed space, also called a Faraday cage.
  • the interconnection is indicated by reference numeral (12).
  • reference numeral (12) For the sake of clarity, all components which are not relevant in this case have been omitted.
  • Fig. 3 shows a part of a diagrammatic cross-section of an embodiment of emission-reducing means according to the invention.
  • a thermoplastic layer (7) is present between two glass plates (4, 5).
  • a conducting layer (6) is vapor- deposited on one of the glass plates (4).
  • the glass plates may have a thickness of, for example 2.8 mm and 1.2 mm, respectively.
  • the PNB layer may have a thickness of 0.76 mm.
  • the vapor-deposited layer has a much smaller thickness.
  • Fig. 4 shows a part of a diagrammatic cross-section of an embodiment of emission-reducing means according to the invention, provided with an anti-reflection coating and an anti-static coating.
  • the part of the means which is transparent, as is shown in Fig. 2 is supplemented with an anti-reflection coating (8) and an anti-static coating (9).
  • the panel in question had the following properties: surface area of 997 x 597 mm - thickness of 3-4 mm
  • Fig. 5 is a diagrammatic longitudinal section of a picture display device with a separate shield.
  • a picture display panel (2) is accommodated in a cabinet (3).
  • An emission-reducing shield (1) in a frame (10) is placed in front of the cabinet.
  • the invention relates to an emission-reducing shield for a display, comprising two glass plates.
  • a conducting layer is present on one of the glass plates.
  • the layer is transparent so that there is no Moire effect.
  • the shield may also have an antistatic coating and an anti-reflection coating.

Landscapes

  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)

Abstract

L'invention concerne un blindage de réduction des émissions pour écran comprenant deux plaques de verre. Une couche conductrice est disposée sur l'une des plaques de verre. Cette couche est une couche continue de façon à éviter le moirage. Le blindage peut également comporter un revêtement antistatique et antireflet.
PCT/IB1998/000287 1997-04-01 1998-03-05 Dispositif d'affichage d'images dote d'un systeme de reduction des emissions WO1998044771A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IB1998/000287 WO1998044771A2 (fr) 1997-04-01 1998-03-05 Dispositif d'affichage d'images dote d'un systeme de reduction des emissions
JP10529308A JP2000511708A (ja) 1997-04-01 1998-03-05 エミッション低減手段が設けられた画像表示装置

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP97200948.4 1997-04-01
EP97200948 1997-04-01
PCT/IB1998/000287 WO1998044771A2 (fr) 1997-04-01 1998-03-05 Dispositif d'affichage d'images dote d'un systeme de reduction des emissions

Publications (2)

Publication Number Publication Date
WO1998044771A2 true WO1998044771A2 (fr) 1998-10-08
WO1998044771A3 WO1998044771A3 (fr) 1999-02-11

Family

ID=26146313

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1998/000287 WO1998044771A2 (fr) 1997-04-01 1998-03-05 Dispositif d'affichage d'images dote d'un systeme de reduction des emissions

Country Status (1)

Country Link
WO (1) WO1998044771A2 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381421A (en) * 1980-07-01 1983-04-26 Tektronix, Inc. Electromagnetic shield for electronic equipment
US4732454A (en) * 1985-04-22 1988-03-22 Toray Industries, Inc. Light-transmissible plate shielding electromagnetic waves
EP0277818A2 (fr) * 1987-02-03 1988-08-10 Pilkington Plc Panneau pour blindage électromagnétique
EP0299607A1 (fr) * 1987-06-09 1989-01-18 Pilkington Plc Panneau de protection
EP0322720A2 (fr) * 1987-12-25 1989-07-05 Asahi Glass Company Ltd. Corps transparent pour le blindage contre les ondes électromagnétiques

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381421A (en) * 1980-07-01 1983-04-26 Tektronix, Inc. Electromagnetic shield for electronic equipment
US4732454A (en) * 1985-04-22 1988-03-22 Toray Industries, Inc. Light-transmissible plate shielding electromagnetic waves
EP0277818A2 (fr) * 1987-02-03 1988-08-10 Pilkington Plc Panneau pour blindage électromagnétique
EP0299607A1 (fr) * 1987-06-09 1989-01-18 Pilkington Plc Panneau de protection
EP0322720A2 (fr) * 1987-12-25 1989-07-05 Asahi Glass Company Ltd. Corps transparent pour le blindage contre les ondes électromagnétiques

Also Published As

Publication number Publication date
WO1998044771A3 (fr) 1999-02-11

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