EP0462019B1 - Apparat zur Anzeige oder Projektion von Bildern oder ähnlichem - Google Patents

Apparat zur Anzeige oder Projektion von Bildern oder ähnlichem Download PDF

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Publication number
EP0462019B1
EP0462019B1 EP91401593A EP91401593A EP0462019B1 EP 0462019 B1 EP0462019 B1 EP 0462019B1 EP 91401593 A EP91401593 A EP 91401593A EP 91401593 A EP91401593 A EP 91401593A EP 0462019 B1 EP0462019 B1 EP 0462019B1
Authority
EP
European Patent Office
Prior art keywords
layer
abrasion
adamantine carbon
external
carbon
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
EP91401593A
Other languages
English (en)
French (fr)
Other versions
EP0462019A1 (de
Inventor
Alain Staron
Paul-Louis Meunier
Jean-Marie Machowski
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.)
Vantiva SA
Original Assignee
Thomson Multimedia SA
Thomson Consumer Electronics SA
Thomson Consumer Electronics Inc
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 Thomson Multimedia SA, Thomson Consumer Electronics SA, Thomson Consumer Electronics Inc filed Critical Thomson Multimedia SA
Publication of EP0462019A1 publication Critical patent/EP0462019A1/de
Application granted granted Critical
Publication of EP0462019B1 publication Critical patent/EP0462019B1/de
Anticipated expiration legal-status Critical
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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
    • 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
    • H01J29/88—Vessels; Containers; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings

Definitions

  • the invention relates to a device for viewing or projecting images or the like, comprising an external outlet face covered by a transparent coating and resistant to abrasion.
  • Display devices such as cathode ray tubes and liquid crystal displays, have a transparent front wall, most often made of glass. The image is formed on one side of this wall and is observed on the other side.
  • the quality of the image observed depends on the physical properties of the material of the wall and its state, in particular the state of the external face.
  • a projection device usually includes an output objective and the quality of the projected image may be degraded by a poor condition of the external surface of the projection objective.
  • the invention makes it possible to reduce the dependence on external disturbances of the state of the external surface of the transparent front wall of the display device or the state of the external face of the projection objective.
  • the abrasion-resistant layer comprises at least one of the following materials: adamantine carbon, Y2O3, Al2O3, tin and indium oxide with implantation of oxygen.
  • the transparent front wall of the display or projection device is covered with a transparent layer of an abrasion-resistant material, of a hardness substantially greater than that of the material constituting the front wall or the objective, and / or a conductive transparent material.
  • An anti-abrasive layer reduces the risk of alteration, for example by scratches, of the external face of the front wall or of the lens.
  • a conductive layer makes it possible to prevent the external face attracting dust by accumulation of static electricity.
  • one and / or the other of the abrasion-resistant or conductive layers is associated with an anti-reflection layer making it possible to reduce the coefficient of reflection of ambient light on the external display or display surface. projection.
  • the anti-abrasion layer will preferably be the outer layer.
  • a single layer which is both abrasion-resistant and conductive.
  • This layer is for example a conductive tin and indium oxide, the anti-abrasion function of which is achieved by surface densification by implantation of oxygen ions.
  • adamantine carbon as an anti-abrasion material. Indeed, this material is not very rough, has a hardness of between 1,500 and 4,000 Kg / mm2 and is chemically inert. It is preferable to choose a small thickness, less than 100 ⁇ , so as not to alter the quality of transmission of the transparent wall or of the objective to be protected.
  • the mechanical and optical properties of adamantine carbon can be adjusted if it is mixed with selected quantities of hydrogen.
  • the refractive index can be chosen at will between 1.9 and 2.1 with a rate of hydrogen atoms of between 35 and 55%.
  • the advantage of the adjustable choice of the value of the refractive index is that it is thus possible to easily associate an anti-reflection layer with said layer of adamantine carbon.
  • Adamantine carbon also constitutes a filter opposing the transmission of ultraviolet radiation.
  • Adamantine carbon can be deposited on a glass wall - generally previously coated with conductive and / or anti-reflective layers - by a chemical vapor deposition method using a plasma starting from a hydrocarbon such than methane CH4.
  • a chemical vapor deposition method using a plasma starting from a hydrocarbon such than methane CH4.
  • bombardment of a graphite target placed opposite the wall to be covered combustion of acetylene and hydrogen in the presence of oxygen, etc.
  • the invention consists in placing on the front face, visible, of a device for viewing or projecting images, a layer of a material opposing abrasion and / or of a conductive material. .
  • the added layer is transparent.
  • the anti-abrasion and / or conductive layer be associated with an anti-reflection layer.
  • cathode ray tube for high definition television.
  • Such a tube has a glass envelope ending, towards the front, by a slab with a front display face.
  • ITO tin and indium oxide
  • this treatment minimizes the risk of scratches.
  • this oxide in such a way that it has a refractive index equal to the square root of the index of the glass constituting the slab of the tube.
  • the thickness of the tin and indium oxide layer is sufficiently small, of the order of 10 ⁇ 6 to 2 x 10 ⁇ 6 cm (100 to 200 ⁇ ), so that it is transparent. .
  • this layer remains transparent up to a thickness of the order of 5 x 10 ⁇ 5 cm (5000 ⁇ ) or more.
  • adamantine carbon having a structure analogous to that of diamonds.
  • the adamantine carbon deposited at a thickness of between 4 x 10 ⁇ 8 and 10 ⁇ 6 cm (4 A and 100 ⁇ ), constitutes the last layer deposited on a layer of conductive and / or anti-reflective ITO.
  • Adamantine carbon has an amorphous structure, is chemically inert and has a hardness of between 1,500 and 4,000 Kg / mm2; it can be deposited by several techniques.
  • the so-called PCVD technique will be used which consists in placing the slab of the tube 10 in an enclosure 11 (FIG. 1) inside which CH4 methane or another hydrocarbon is introduced and a microwave plasma 12 is formed which cracks the hydrocarbon molecules.
  • a microwave plasma 12 is formed which cracks the hydrocarbon molecules.
  • hydrogen is separated from carbon; this latter material is deposited on the target 10 a that constitutes the external face of the slab of the tube.
  • a deposit of adamantine carbon with a thickness of 2 x 10 ⁇ 7 to 5 x 10 ⁇ 7 cm (20 to 50 ⁇ ) is obtained in a few tens of seconds.
  • the deposited layer 13 may contain hydrogen.
  • the quantity of hydrogen can be adjusted by limiting the proportion of the hydrocarbon molecules which are cracked.
  • the refractive index of adamantine carbon is between 1.9 and 2.1 if the proportion of hydrogen atoms is between 35 and 55%.
  • the slab 10 ′ of the tube is placed in an enclosure 11 ′ inside which a high vacuum is produced of the order of 1.33 x 10 ⁇ 4 Pa (10 ⁇ 6 torr) .
  • Opposite slab 10 ′ is a graphite target 14. The face of this target which is opposite the external face of the slab 10 ′ is bombarded with ions which tear off carbon ions coming to deposit on the substrate.
  • the substrate 10, 10 ′ is heated to a temperature of the order of 200 to 300 ° C.
  • adamantine carbon by combustion in the oxygen of a hydrocarbon with hydrogen, the slab being heated to a temperature of the order of 800 ° C.
  • a conventional diamond growth technique which consists in heating the slab to a temperature between 600 and 1100 ° C in an enclosure inside which is introduced a tungsten filament heated to 2000 ° C by current flow, this enclosure containing a mixture of 98.5% hydrogen, 1% methane CH4 and 0.5%, oxygen.
  • FIG 3 there is shown schematically an outer surface coating 15 of slab 10 of tube television.
  • a layer 16 of titanium oxide TiO2 with a refractive index 2.4 and of thickness 7 x 10 ⁇ 7 cm (70 , 1 ⁇ )
  • adamantine carbon index 1.9, can be replaced by ITO.
  • Layers 16 to 19 have an index adaptation role allowing the anti-reflection function.
  • the adamantine carbon can be replaced by transparent amorphous carbon or by another hard oxide such as Y2O3 or Al2O3 (alumina).
  • the abrasion-resistant layer is adamantine carbon and it is covered by a thin film of hard and conductive ITO.

Landscapes

  • Surface Treatment Of Optical Elements (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Surface Treatment Of Glass (AREA)

Claims (6)

  1. Vorrichtung zur Anzeige oder Projektion von Bildern mit einer äußeren Ausgangsseite (15), die mit einer transparenten und abriebfesten Beschichtung (13) bedeckt ist, dadurch gekennzeichnet, daß die abriebfeste Schicht mindestens eines der folgenden Materialien enthält: Adamantinkohlenstoff, Y₂O₃, Al₂O₃, Zinn- und Indiumoxid mit Sauerstoffimplantierung.
  2. Vorrichtung nach Anspruch 1, in der die abriebfeste Schicht Adamantinkohlenstoff enthält, dadurch gekennzeichnet, daß die Schicht Wasserstoff enthält.
  3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die abriebfeste Schicht Adamantinkohlenstoff enthält und die Dicke dieser Schicht zwischen 4 x 10⁻⁸ und 10⁻⁶ cm (4 bzw. 100 Å) liegt.
  4. Vorrichtung nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die äußere Ausgangsseite mit einer leitenden transparenten Beschichtung bedeckt ist.
  5. Vorrichtung nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Außenseite außerdem eine Antireflexbeschichtung besitzt.
  6. Vorrichtung nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die abriebfeste Schicht die äußerste Schicht ist.
EP91401593A 1990-06-15 1991-06-14 Apparat zur Anzeige oder Projektion von Bildern oder ähnlichem Expired - Lifetime EP0462019B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9007517 1990-06-15
FR9007517A FR2663486B1 (fr) 1990-06-15 1990-06-15 Dispositif de visualisation ou de projection d'images ou analogues.

Publications (2)

Publication Number Publication Date
EP0462019A1 EP0462019A1 (de) 1991-12-18
EP0462019B1 true EP0462019B1 (de) 1994-12-14

Family

ID=9397675

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91401593A Expired - Lifetime EP0462019B1 (de) 1990-06-15 1991-06-14 Apparat zur Anzeige oder Projektion von Bildern oder ähnlichem

Country Status (5)

Country Link
US (1) US5223765A (de)
EP (1) EP0462019B1 (de)
JP (1) JP3025343B2 (de)
DE (1) DE69105826T2 (de)
FR (1) FR2663486B1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2912506B2 (ja) * 1992-10-21 1999-06-28 シャープ株式会社 透明導電膜の形成方法
DE4423891A1 (de) * 1994-07-07 1996-01-11 Daimler Benz Ag Schichtaufbau mit einer organischen Schicht und einer die organische Schicht bedeckenden und gegenüber der organischen Schicht härteren, transparenten Deckschicht sowie Verfahren zur Herstellung des Schichtaufbaus
DE4423833C2 (de) * 1994-07-07 1998-07-23 Daimler Benz Ag Lackschicht zur späteren Beschichtung mit einer gegenüber der organischen Lackschicht härteren Deckschicht und Verfahren zur Oberflächenbehandlung der Lackschicht
DE4427715C1 (de) * 1994-08-05 1996-02-08 Daimler Benz Ag Komposit-Struktur mit auf einer Diamantschicht und/oder einer diamantähnlichen Schicht angeordneter Halbleiterschicht sowie ein Verfahren zu deren Herstellung
DE19752889C1 (de) * 1997-11-28 1999-06-24 Fraunhofer Ges Forschung Verfahren zur Beschichtung von Oberflächen
KR100274883B1 (ko) * 1999-03-19 2000-12-15 김순택 음극선관
US6836292B2 (en) 2001-06-01 2004-12-28 Hewlett-Packard Development Company, L.P. Conductively coated and grounded optics to eliminate dielectric dust attraction
DE10259174B4 (de) * 2002-12-18 2006-10-12 Robert Bosch Gmbh Verwendung eines tribologisch beanspruchten Bauelements

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5996638A (ja) * 1982-11-25 1984-06-04 Asahi Glass Co Ltd ブラウン管の帯電防止膜
DE3629996A1 (de) * 1986-09-03 1988-03-17 Flachglas Ag Vorsatzaggregat fuer die kathodenstrahlroehre von monitoren, fernsehapparaten und dergleichen
GB8621468D0 (en) * 1986-09-05 1986-10-15 Philips Nv Display device
US4767969A (en) * 1987-05-26 1988-08-30 Honeywell, Inc. RF emission shield for CRT displays
US4839736A (en) * 1987-07-06 1989-06-13 Mitsui Toatsu Chemicals, Inc. Filter for CRT screen
JPH0275137A (ja) * 1988-09-09 1990-03-14 Hitachi Ltd 陰極線管
JP2804049B2 (ja) * 1988-09-19 1998-09-24 株式会社日立製作所 陰極線管
US5132585A (en) * 1990-12-21 1992-07-21 Motorola, Inc. Projection display faceplate employing an optically transmissive diamond coating of high thermal conductivity

Also Published As

Publication number Publication date
EP0462019A1 (de) 1991-12-18
DE69105826D1 (de) 1995-01-26
JP3025343B2 (ja) 2000-03-27
FR2663486A1 (fr) 1991-12-20
FR2663486B1 (fr) 1997-01-24
DE69105826T2 (de) 1995-04-27
US5223765A (en) 1993-06-29
JPH06139963A (ja) 1994-05-20

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