EP0574112A1 - A coating composition and a cathode ray tube using the same - Google Patents

A coating composition and a cathode ray tube using the same Download PDF

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Publication number
EP0574112A1
EP0574112A1 EP93302158A EP93302158A EP0574112A1 EP 0574112 A1 EP0574112 A1 EP 0574112A1 EP 93302158 A EP93302158 A EP 93302158A EP 93302158 A EP93302158 A EP 93302158A EP 0574112 A1 EP0574112 A1 EP 0574112A1
Authority
EP
European Patent Office
Prior art keywords
coating
metal salt
salt
composition
nitrate
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Withdrawn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
EP93302158A
Other languages
German (de)
English (en)
French (fr)
Inventor
Su-Min Jeong
Jeong-Hoon Woo
Dong-Sik Jang
Heon-Soo Kim
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.)
Samsung SDI Co Ltd
Original Assignee
Samsung Display Devices Co Ltd
Samsung Electron Devices 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 Samsung Display Devices Co Ltd, Samsung Electron Devices Co Ltd filed Critical Samsung Display Devices Co Ltd
Publication of EP0574112A1 publication Critical patent/EP0574112A1/en
Withdrawn legal-status Critical Current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
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H01J29/896—Anti-reflection means, e.g. eliminating glare due to ambient light
    • 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
    • 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 a coating composition and a cathode ray tube using the same, and particularly to a coating composition comprising a novel metal salt, and to cathode ray tube using the same, having good non-glare characteristics, manufactured by spin coating a coating composition.
  • image display devices such as cathode ray tubes (CRT) and liquid crystal devices (LCD), etc.
  • CTR cathode ray tubes
  • LCD liquid crystal devices
  • a method which prevents the reflection by manufacturing a concavo-convex pattern on the viewing surface of the display devices such as CRTs, to induce a diffused reflection of the external light incident upon the outer surface of the panel.
  • Japanese Patent Laid-open Publication No. sho 44-11150 discloses a method for manufacturing a non-glare coating layer through coating "water glass” (potassium silicate) on the outer surface of the panel.
  • water glass potassium silicate
  • a white, opaque coating layer appears and results in a great transmittance drop which prohibits practical use.
  • Japanese Utility Model Laid-open Publication No. sho 50-26277 discloses a method for manufacturing a coating having SiO2 particles by spray coating hydrolyzed silicon tetrachloride (SiCl4) on the surface of a panel.
  • SiCl4 hydrolyzed silicon tetrachloride
  • Japanese Patent Laid-open Publication No. sho 61-118931 and sho 61-29051 suggest methods for manufacturing non-glare coating layers manufactured by a method comprising the steps of spray coating hydrolyzed solution of alkyl silicate (Si(OR)4) on the surface of the panel and then hardening the solution at a temperature above 80°C to produce a SiO2 concavo-convex pattern.
  • This method is practical and is now being applied in actual use.
  • the reflectance (gloss value) of the external light ranges from 40 to 70%. Due to certain characteristics of the spray coating, reflectances above 70% are difficult to reproduce. Moreover the coating layer is very weak.
  • Figures 1A and 2A illustrate a spray coating method and a spin coating method (called a clear coating), respectively, for coating a composition onto a cathode ray tube.
  • Figure 1B is an enlarged view of the coating layer obtained by the method of Figure 1A
  • Figure 2B is an enlarged view of a coating layer obtained by the method of Figure 2A.
  • the concavo-convex pattern (3) on the panel (2) as manufactured via spray coating is rougher than that manufactured by the spin coating method, the diffused reflection effect is better in the coating layer according to the spray coating method.
  • the thickness of the coating layer needs to be adjusted, and due to characteristics of the spray coating method, a compact pattern cannot be manufactured.
  • a coating layer having high reflectance of the external light is very difficult to obtain.
  • the coating layer by a spin coating method has a constant thickness and a high reflectance of external light.
  • the object of the present invention is to provide a coating composition which gives a coating layer having a wide range of reflectance of the external light and enhances the strength of the layer though manufacturing the layer through spin coating.
  • Another object of the present invention is to provide a cathode ray tube having good antistatic and non-glare characteristics, manufactured by employing the above coating composition.
  • a coating composition comprising alkyl silicate, a conductive material, distilled water and organic solvent, characterized in that the coating composition further comprises at least one metal salt selected from the group consisting of chloride salt, nitrate salt and acetic acid salt, and the amount of the metal salt is 0.01 to 2 weight percent based on the composition.
  • a cathode ray tube having an antistatic and non-glare coating layer on the outer surface of a panel, comprising silicon dioxide and a conductive material.
  • the coating layer further comprises at least one metal salt selected from a chloride salt, a nitrate salt and an acetic acid salt, preferably using a spin coating method to coat a coating composition on the surface of the panel. The composition is then dried.
  • a preferred metal salt is at least one selected from potassium chloride (KCl), sodium chloride (NaCl), ammonium chloride (NH4Cl) potassium nitrate (KNO3), sodium nitrate (NaNO3), ammonium nitrate (NH4NO3), potassium acetate (CH3COOK), sodium acetate (CH3COONa) and ammonium acetate (CHCOONH4).
  • tin (Sn) compound antimony (Sb) compound, platinum (Pt) compound, gold (Au) compound, indium (In) compound or zirconium (Zr) compound can be employed.
  • the metal salts added to the coating composition of the present invention exist in an aqueous solution state. After coating the composition on the outer surface of a panel, the composition is heated and dried. As the water and organic solvent vaporize from the surface, the metal salt dissolved in the solution precipitates as a crystal. The separation of the metal salt from the continuous silicate structure produces the concavo-convex pattern.
  • the coating composition of the present invention gives a concavo-convex pattern which provides a good non-glare effect in the coating layer even when using the spin coating method.
  • the amount added of the metal salt ranges from 0.01 to 2 weight percent based on the total amount of the composition. If the amount added of the metal salt is less than 0.01 weight percent, the reflectance of the external light of the manufactured cathode ray tube is too high, and if the amount added of the metal salt is more than 2 weight percent, the reflectance of the external light is too low.
  • the preferred amount added of the metal salt is about 1 weight percent.
  • a coating composition according to the present invention is manufactured as follows. First, tetraethyl orthosilicate, organic solvent, conductive material and distilled water are mixed and the mixture is matured in an approximately 60°C water bath for about 6 days. Metal salt is dissolved in distilled water, this solution is added to the above matured mixture and the thus-obtained mixture is stirred for about 2 hours. The mixture is spin coated on the outer surface of the panel at the speed of 50 to 100 rpm, for 5 to 20 seconds. Drying the coated composition at the temperature ranging from 80 to 200°C for 0.5 to 2 hours gives a coating layer manufactured by the use of a coating composition accordingly to the present invention.
  • TEOS tetraethyl orthosilicate
  • 3 wt% methyl alcohol --- 83 wt% distilled water
  • 10 wt% tin chloride (SnCl4.nH2O) 3 wt% potassium chloride
  • 1 wt% All of the above compounds except the potassium chloride are mixed together and matured in a 60°C water bath for 72 hours.
  • a 10 weight/vol% aqueous potassium chloride solution is added to the matured mixture and stirred for 2 hours to give a coating composition according to the present invention.
  • the composition is spin coated on the surface of a panel at a speed of 150 rpm for 2 minutes. Then, the coated panel is baked at 170°C for 0.5 hours.
  • TEOS tetraethyl orthosilicate
  • 3 wt% methyl alcohol --- 83 wt% distilled water
  • 10 wt% tin chloride SnCl4.nH2O
  • 3 wt% Sodium nitrate 1 wt%
  • a coating composition according to the present invention is obtained here by the same procedure as example 1, except that sodium nitrate is employed in lieu of the potassium chloride. Coating this composition on the outer surface of a panel and drying by heating gives a non-glare cathode ray tube according to the present invention.
  • TEOS tetraethyl orthosilicate
  • SnCl4.nH2O tin chloride
  • Ammonium acetate 1 wt%
  • a coating composition according to the present invention is obtained here by the same procedure as example 1, except that ammonium acetate is employed in lieu of the potassium chloride. Coating this composition on the outer surface of a panel and drying by heating gives a non-glare cathode ray tube according to the present invention.
  • Figure 3 is an enlarged photograph (400 times) of the coating layer manufactured by the coating method of Figure 1A, using the coating composition obtained through example 1.
  • Figures 4 to 6 are enlarged photographs (400 times) of the coating layers manufactured by the coating method of Figure 2A, using the coating compositions obtained through examples 1, 2 and 3. As confirmed by the photographs, the coating layer obtained using the spin coating method also has the deep and clear pattern as obtained via the spray coating method.
  • Figure 7 is an enlarged photograph (400 times) of the coating layer manufactured by the coating method of Figure 2, while blowing dry air on the surface of the panel, and using the coating composition obtained through example 1. This photograph confirms that the concavo-convex shape is not deep.
  • Figure 8 is a cross-sectional view of coating layers such as those illustrated in Figures 3 to 6, and Figure 9 is a cross-sectional view of a coating layer such as that illustrated in Figure 7.
  • the metal salt (4) in the coating layer is manufactured by the common spray or spin coating method, and is precipitated on the upper surface of the silicate layer (5).
  • the metal salt (4) in the coating layer manufactured by blowing dry air during coating is not completely separated from the silicate layer (5) and gives a coating layer on the panel (2) having a shallow concavo-convex shape.
  • Figure 10 is an enlarged view of coating layers, such as those illustrated in Figures 4 to 6, which shows the reaction principal of the coating composition on the panel.
  • the metal salts exposed to the air in the silicate layer absorb a small amount of unvaporized moisture and solvent remaining after drying and baking process from the network-type silicate layer, and vaporize them into the air to provide a solid coating layer.
  • the arrows indicate the proceeding direction of the solvent (6) and the vaporized solvent (6').
  • Figure 11 is a graph showing the reflectance of the external light according to the amount of the metal salt added in the coating composition of the present invention.
  • the coating layers were manufactured through the procedure in example 1 while changing the added amount of the potassium chloride (based on the total weight of the coating composition), and the reflectance of the external light for each coating layer was detected and plotted.
  • the reflectance of the external light is the percentage of the reflected light from a glass regarded as 100% when the incidence angle of the external light is 60°, and is detected by means of a GM-060 detector manufactured by Minolta Co.
  • the reflectance of the cathode ray tube employing a coating composition according to the present invention is easily adjustable by adjusting the amount of the metal salt added in the coating composition.
  • the reflectance of the external light varies from 40% to 90% in accordance with the added amount of the metal salt which is given to be in the range of from 0.01 to 2 weight percent.
  • the amount of additional metal salt is limited to this range so that the reflectance of the external light of the manufactured cathode ray tube lies between 40% to 90%.
  • the reflectance is lower than 40%, the resolution of the cathode ray tube deteriorates and the quality of the reproduce image also deteriorates due to the sparkling and if the reflectance is higher than 90%, the panel begins to bear similar effects as the common glass.
  • a preferred value of the reflectance ranges from 50% to 60%.
  • the added amount of the metal salt is 1 weight percent as in the example illustrated, the reflectance of the cathode ray tube is about 55%. That is to say, the reflectance of the external light can be controlled by adjusting the amount of added metal salt.
  • the present invention provides a coating composition which enables easy adjustment of the reflectance of the external light through varying the amount of the metal salt added, and forms a coating layer having a wide range of reflectance through a spin coating without special processing or separate equipment for spray coating.
  • the metal salt absorbs a small amount of solvent contained in the network of silicate layer and evaporates the solvent into the air to give a cathode ray tube having a solid coating layer.
  • the equipment and thus, the equipment cost) is greatly reduced.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Paints Or Removers (AREA)
  • Surface Treatment Of Optical Elements (AREA)
EP93302158A 1992-06-09 1993-03-22 A coating composition and a cathode ray tube using the same Withdrawn EP0574112A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR998992 1992-06-09
KR1019920009989A KR940001242A (ko) 1992-06-09 1992-06-09 음극선관용 코팅조성물 및 이를 사용한 음극선관

Publications (1)

Publication Number Publication Date
EP0574112A1 true EP0574112A1 (en) 1993-12-15

Family

ID=19334431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93302158A Withdrawn EP0574112A1 (en) 1992-06-09 1993-03-22 A coating composition and a cathode ray tube using the same

Country Status (5)

Country Link
EP (1) EP0574112A1 (ko)
JP (1) JP2768396B2 (ko)
KR (1) KR940001242A (ko)
CN (1) CN1079977A (ko)
TW (1) TW225035B (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6440491B1 (en) * 1994-07-29 2002-08-27 Donnelly Corporation Processes for forming transparent substrate with diffuser surface
CN101937821A (zh) * 2010-03-30 2011-01-05 中山大学 真空设备荧光屏及该荧光屏的无胶制作方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2231789B1 (en) * 2007-12-10 2012-02-08 Hempel A/S Alkyl silicate paint compositions with improved cracking resistance

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1136977A (en) * 1965-06-15 1968-12-18 Acheson Ind Inc Compositions and methods for producing electrically conductive coatings
EP0288982A2 (en) * 1987-04-28 1988-11-02 Kabushiki Kaisha Toshiba Cathode ray tube
DE3918744A1 (de) * 1988-06-17 1989-12-28 Mitsubishi Electric Corp Blendarme kathodenstrahlroehre und verfahren zu deren herstellung
EP0450134A1 (en) * 1990-03-31 1991-10-09 Samsung Display Devices Co., Ltd. Anti-dazzling and electrostatic charge-preventive transparent coating material, method thereof and video display coated therewith

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01276534A (ja) * 1988-04-28 1989-11-07 Toshiba Corp 陰極線管外表面の帯電防止膜形成方法
JP2858821B2 (ja) * 1989-11-08 1999-02-17 株式会社日立製作所 反射防止膜とその製法並びに画像表示面板

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1136977A (en) * 1965-06-15 1968-12-18 Acheson Ind Inc Compositions and methods for producing electrically conductive coatings
EP0288982A2 (en) * 1987-04-28 1988-11-02 Kabushiki Kaisha Toshiba Cathode ray tube
DE3918744A1 (de) * 1988-06-17 1989-12-28 Mitsubishi Electric Corp Blendarme kathodenstrahlroehre und verfahren zu deren herstellung
EP0450134A1 (en) * 1990-03-31 1991-10-09 Samsung Display Devices Co., Ltd. Anti-dazzling and electrostatic charge-preventive transparent coating material, method thereof and video display coated therewith

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6440491B1 (en) * 1994-07-29 2002-08-27 Donnelly Corporation Processes for forming transparent substrate with diffuser surface
US6620454B2 (en) * 1994-07-29 2003-09-16 Donnelly Corporation Processes for forming a faceplate having a transparent substrate with diffuser surface
CN101937821A (zh) * 2010-03-30 2011-01-05 中山大学 真空设备荧光屏及该荧光屏的无胶制作方法
CN101937821B (zh) * 2010-03-30 2012-02-15 中山大学 真空设备荧光屏及该荧光屏的无胶制作方法

Also Published As

Publication number Publication date
CN1079977A (zh) 1993-12-29
KR940001242A (ko) 1994-01-11
JP2768396B2 (ja) 1998-06-25
TW225035B (ko) 1994-06-11
JPH06260114A (ja) 1994-09-16

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