EP1233440A1 - Elektrische Abschirmung und Blendschutzmehrschicht für eine Kathodenstrahlröhre und zugehöriges Herstellungsverfahren - Google Patents

Elektrische Abschirmung und Blendschutzmehrschicht für eine Kathodenstrahlröhre und zugehöriges Herstellungsverfahren Download PDF

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Publication number
EP1233440A1
EP1233440A1 EP01104064A EP01104064A EP1233440A1 EP 1233440 A1 EP1233440 A1 EP 1233440A1 EP 01104064 A EP01104064 A EP 01104064A EP 01104064 A EP01104064 A EP 01104064A EP 1233440 A1 EP1233440 A1 EP 1233440A1
Authority
EP
European Patent Office
Prior art keywords
glaring
layer
electric shielding
layer coating
ray tube
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Withdrawn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
EP01104064A
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English (en)
French (fr)
Inventor
Yuan-Hsiang Yu
Li-Sha Yu
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.)
Teco Information Systems Co Ltd
Original Assignee
Teco Information Systems Co Ltd
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 Teco Information Systems Co Ltd filed Critical Teco Information Systems Co Ltd
Priority to EP01104064A priority Critical patent/EP1233440A1/de
Publication of EP1233440A1 publication Critical patent/EP1233440A1/de
Withdrawn legal-status Critical Current

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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 present invention relates to an electric shielding and anti-glaring multi-layer coating for cathode ray tube, especially to an electric shielding and anti-glaring multi-layer coating for cathode ray tube, which has good hardness and anti-smudge, and the method for making the same.
  • the conventional cathode ray tube generally has one or a plurality of coating layers formed on the glass panel thereof by chemical coating process such as spin coating or spraying.
  • chemical coating process such as spin coating or spraying.
  • the optical properties and electromagnetic properties on the surface of the cathode ray tube are important issues.
  • the optical and electromagnetic quality of the cathode ray tube is hard to satisfy the quality requirement in the future if the surface coatings are made by spinning or spraying.
  • the surface coatings made by conventional process further have following drawbacks.
  • the sheet resistance is more than 10 3 ⁇ / ⁇ such that the electric shielding effect is not satisfactory.
  • the light transmission rate is not easy to be adjustable and the reflection bandwidth is not sufficient.
  • PET films are attached on the glass surface as suggested by the TOYO Company to improve optical and electrical properties.
  • the hardness of the PET film is not good (pencil hardness 3-4H) and damage becomes serious problem to the PET film.
  • the surface coatings made by sputtering only have the problem of poor resistance to dirt and fingerprint. Moreover, the processing time is long and the cost is high to prohibit mass production.
  • the multi-layer coating comprises layers formed by sputtering; the sputtering layers have compact structure and smooth surface for enhancing the spraying of the anti-glaring layer.
  • the multi-layer coating is formed by sputtering and spraying process, separately. Therefore, the multi-layer coating has high hardness, resistance to fingerprint.
  • the multi-layer coating has low sheet resistance (smaller than 100 ⁇ / ⁇ ) and thus has excellent electric shielding effect and satisfies the security requirement for reducing alternating electric field (AEF).
  • the multi-layer coating has a protective layer to facilitate the formation of an anti-glaring layer.
  • the multi-layer coating has anti-glaring effect and anti-reflection effect in wide spectral range.
  • the multi-layer coating can be used to adjust the light transmission rate of the glass panel.
  • the present invention combines the process of sputtering and spraying to simplify process and enhance yield.
  • Fig. 1 shows the preferred embodiment of the present invention.
  • the electric shielding and anti-glaring multi-layer coating for CRT according to the present invention can be applied to a CRT 21.
  • the CRT 21 mainly comprises a glass hood 22 which include a glass panel 23, a neck 24 and a funnel 25.
  • the glass panel 23 has a fluorescent layer 26 on the inner surface thereof and composed of a plurality of fluorescent dots. When the thermionic electrons are landing on the fluorescent dots on the inner surface of the glass panel 23.
  • the fluorescent dots emit light of various colors to form color image on the glass panel 23.
  • the neck 24 houses a plurality of electron guns 27 in linear arrangement, and the electron guns 27 generate a plurality of electron beams 28 focused on the fluorescent layer 26 by the defection yoke 29, which deflect the electron beams 28 in vertical and horizontal directions.
  • the above-mentioned components are well-known arts and will not be described in detail.
  • the glass panel 23 of the CRT 21 has an electric shielding and anti-glaring multi-layer coating 31 on the outer surface thereof.
  • the electric shielding and anti-glaring multi-layer coating 31 comprises a sputtering multi-layers 32 and an anti-glaring layer 33.
  • the sputtering multi-layers 32 comprises an adhesion layer 34, a light absorbing layer 35, a conductive layer 36 and a protective layer 37, wherein above layers are formed by sputtering.
  • the major component of the adhesion layer 34 is silicon dioxide with thickness about 10-20nm (10 -9 m) to enhance the adhesion of other sputtering layers.
  • the major component of the light absorbing layer 35 is Cr, Zn or their metal oxide to control the transmittance of light and has thickness about 10-20nm (10 -9 m).
  • the major component of the conductive layer 36 is indium-tin oxide (ITO) and the thickness thereof is about 20-40nm (10 -9 m).
  • the conductive layer 36 is formed by sputtering to have compact structure such that the conductive layer 36 has small sheet resistance 100 ⁇ / ⁇ .
  • the conductive layer 36 is connected to a protective steel band (not shown) to ground the conductive layer 36. Therefore, the glass panel 23 of the CRT 21 has electric shielding property.
  • the major component of the protective layer 37 is silicon dioxide to protect the conductive layer 36.
  • the protective layer 37 protects the conductive layer 36 from acid corrosion during the process of the anti-glaring coating 31.
  • the thickness of the protective layer 37 is about 20-30nm (10 -9 m). Therefore, the overall thickness of the sputtering multi-layers 32 can be restricted to 80-110nm (10 -9 m).
  • the glass panel 23 is pre-heated to 30-100°C and then an anti-glaring material is sprayed to the protective layer 37.
  • the sprayed anti-glaring material is then baked at the temperature 150-180°C for 20-40 minutes. Afterward, the baked material is cooled to room temperature to form an anti-glaring layer 33 with surface density 0.001-0.01mg/cm 2 .
  • the averaged molecular weight of the anti-glaring material is about 1500-4000g/mole.
  • the anti-glaring material is water soluble material and comprises 5-15 wt% silicon oxide (with formula: Si(OEt) 4 ; Et: ethyl), 0.05-0.1 wt% nitric acid, 30-40 wt% ethyl alcohol, 5-10 wt% isopropyl alcohol, 5-10 wt% methyl alcohol, 3-8 wt% 2-methyl ethyl ketone and 0.1-0.5 wt% surfactant POP (Polyalklene Oxide-modified Polydimethylsiloxanes).
  • POP Polyalklene Oxide-modified Polydimethylsiloxanes
  • the electric shielding and anti-glaring multi-layer coating of the present invention is applied to the outer surface of the glass panel 23 of the CRT 21.
  • the sheet resistance of the glass panel 23 is tested to be 80-100 ⁇ / ⁇ and the pencil hardness thereof is large than 9H, the gloss value is about 40-70%, and having resistance to fingerprint.
  • Fig. 3 shows the flowchart of steps for manufacturing the electric shielding and anti-glaring multi-layer coating of the present invention, which is applied to the outer surface of the glass panel 23 of the CRT 21.
  • the manufacturing method has following steps.
  • Fig. 4 shows the reflectance curve of the glass panel applied with the electric shielding and anti-glaring multi-layer coating of the present invention.
  • the electric shielding and anti-glaring multi-layer coating has low-reflectivity between the spectral range 400-700nm(10 -9 m). Therefore, the multi-layer coating of the present invention has low-reflectivity in wide bandwidth range.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
EP01104064A 2001-02-20 2001-02-20 Elektrische Abschirmung und Blendschutzmehrschicht für eine Kathodenstrahlröhre und zugehöriges Herstellungsverfahren Withdrawn EP1233440A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01104064A EP1233440A1 (de) 2001-02-20 2001-02-20 Elektrische Abschirmung und Blendschutzmehrschicht für eine Kathodenstrahlröhre und zugehöriges Herstellungsverfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01104064A EP1233440A1 (de) 2001-02-20 2001-02-20 Elektrische Abschirmung und Blendschutzmehrschicht für eine Kathodenstrahlröhre und zugehöriges Herstellungsverfahren

Publications (1)

Publication Number Publication Date
EP1233440A1 true EP1233440A1 (de) 2002-08-21

Family

ID=8176543

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01104064A Withdrawn EP1233440A1 (de) 2001-02-20 2001-02-20 Elektrische Abschirmung und Blendschutzmehrschicht für eine Kathodenstrahlröhre und zugehöriges Herstellungsverfahren

Country Status (1)

Country Link
EP (1) EP1233440A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5541770A (en) * 1993-02-19 1996-07-30 Photran Corporation Light attenuating anti-reflection coating including electrically conductive layers
GB2306126A (en) * 1995-10-13 1997-04-30 Sony Corp Display devices having anti-reflection filters
EP0999458A2 (de) * 1998-10-07 2000-05-10 Hitachi, Ltd. Anzeigevorrichtung mit antistatischem und reflexionsminderndem laminierten Film
WO2000039835A1 (en) * 1998-12-29 2000-07-06 Koninklijke Philips Electronics N.V. Light-transmissive substrate having a light-transmissive, low-ohmic coating

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5541770A (en) * 1993-02-19 1996-07-30 Photran Corporation Light attenuating anti-reflection coating including electrically conductive layers
GB2306126A (en) * 1995-10-13 1997-04-30 Sony Corp Display devices having anti-reflection filters
EP0999458A2 (de) * 1998-10-07 2000-05-10 Hitachi, Ltd. Anzeigevorrichtung mit antistatischem und reflexionsminderndem laminierten Film
WO2000039835A1 (en) * 1998-12-29 2000-07-06 Koninklijke Philips Electronics N.V. Light-transmissive substrate having a light-transmissive, low-ohmic coating

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IMAMURA T ET AL: "26.2: A NEW EMI COATING FOR CRT PANEL GLASS", SID INTERNATIONAL SYMPOSIUM DIGEST OF TECHNICAL PAPERS,US,SANTA ANA, SID, vol. 28, 13 May 1997 (1997-05-13), pages 433 - 435, XP000722735, ISSN: 0097-966X *

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