Protective plate for a plasma display and a method for producing the same

• US 7,264,881 B2
• Filed: 10/07/2004
• Issued: 09/04/2007
• Est. Priority Date: 09/26/1996
• Status: Expired due to Fees

• Current Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Inventors: Oyama, Takuji, Ajikata, Toshihiro, Noda, Kazuyoshi, Aikawa, Katsuaki, Osada, Kouichi, Sakurada, Nobuyoshi, Moriwaki, Ken
• Primary Examiner(s): Zimmerman; John J.
• Assistant Examiner(s): BLACKWELL, GWENDOLYN
• Application Number:
  US10/959,134
• Publication Number:
  US 20050057171A1
• Time in Patent Office: 1,062 Days
• Field of Search: 428/410, 428/426, 428/432, 428/434, 313/582
• US Class Current: 428/432
• CPC Class Codes: B32B 17/10005 laminated safety glass or glazing
• CPC Class Codes: B32B 17/10018 comprising only one glass sheet
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 27/06 as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3655 the multilayer coating containing at least one conducting layer
• CPC Class Codes: C03C 17/3671 specially adapted for use as electrodes
• CPC Class Codes: C03C 17/3676 specially adapted for use as electromagnetic shield
• CPC Class Codes: C03C 2218/154 by sputtering
• CPC Class Codes: G02B 1/11 Anti-reflection coatings
• CPC Class Codes: G02B 1/116 including electrically conducting layers
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: G02B 5/22 Absorbing filters G02B5/201 - G02B5/208 take precedence
• CPC Class Codes: G09G 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H01J 11/10 AC-PDPs with at least one main electrode being out of contact with the plasma
• CPC Class Codes: H01J 11/44 Optical arrangements or shielding arrangements, e.g. filters, black matrices, light reflecting means or electromagnetic shielding means
• CPC Class Codes: H01J 2211/446 : Electromagnetic shielding means; Antistatic means
• CPC Class Codes: H01J 2211/448 : Near infrared shielding means
• CPC Class Codes: H01J 5/02 : Vessels; Containers; Shields associated therewith; Vacuum locks
• CPC Class Codes: H01J 5/03 : Arrangements for preventing or mitigating effects of implosion of vessels or containers
• CPC Class Codes: H01J 9/241 : the vessel being for a flat panel display H01J9/261 takes precedence; flat discharge lamps H01J9/248
• CPC Class Codes: H05K 9/0096 : for television displays, e.g. plasma display panel
• CPC Class Codes: Y10T 428/315 : Surface modified glass [e.g., tempered, strengthened, etc.]

Abstract

A protective plate for a plasma display comprises conductive substrate for protecting a plasma display and an electrode in electrical contact with the conductive substrate.

Claims

1. A protective plate for a plasma display comprising:

a substrate;

a conductive electrode formed on the substrate; and

a conductive film formed on the substrate and in contact with the electrode, wherein the conductive film comprises alternating oxide and metal layers laminated into a multilayer structure having a total of 2n+1 layers, where n is an integer of at least one.

2. The protective plate of claim 1, wherein the substrate comprises a glass plate.

3. The protective plate of claim 2, wherein the glass plate comprises a glass plate subjected to a strengthening treatment.

4. The protective plate of claim 1, wherein the conductive electrode comprises a conductive material formed around a periphery of a main surface of the substrate.

5. The protective plate of claim 4, wherein said conductive film is formed on a middle portion of said main surface of the substrate and covering at least a portion of said conductive electrode such that the conductive electrode is interposed between the conductive film and the substrate.

6. The protective plate of claim 5, further comprising a colored ceramic layer formed around said periphery of a main surface of the substrate and interposed between said substrate and said conductive electrode.

7. The protective plate of claim 1, wherein the conductive film comprises:

a first oxide layer;

a first metal layer formed on the first oxide layer;

a second oxide layer formed on the first metal layer;

a second metal layer formed on the second oxide layer;

a third oxide layer formed on the second metal layer;

a third metal layer formed on the third oxide layer;

a fourth oxide layer formed on the third metal layer;

a fourth metal layer formed on the fourth oxide layer; and

a fifth oxide layer formed on the fourth metal layer.

8. The protective plate of claim 1, wherein the conductive film comprises:

a first oxide layer;

a first metal layer formed on the first oxide layer;

a second oxide layer formed on the first metal layer;

a second metal layer formed on the second oxide layer;

a third oxide layer formed on the second metal layer;

a third metal layer formed on the third oxide layer; and

a fourth oxide layer formed on the third metal layer.

9. The protective plate of claim 8, wherein at least one of the oxide layers comprises Indium Tin Oxide (ITO).

10. The protective plate of claim 8, wherein at least one of the oxide layers comprises Zinc Oxide (ZnO).

11. The protective plate of claim 8, wherein at least one of the oxide layers comprises a plurality of thin oxide layers.

12. The protective plate of claim 8, wherein a thickness of each of said second and third oxide layers is thicker than a thickness of each of said first and fourth oxide layers.

13. The protective plate of claim 8, wherein at least one of the metal layers comprises Ag.

14. The protective plate of claim 8, wherein said first, second and third metal layers have substantially equal thickness.

15. The protective plate of claim 1, wherein said conductive film comprises a sputtered film.

16. The protective plate of claim 1, wherein at least some of the alternating oxide and metal films are in direct contact with one another.

17. The protective plate of claim 1, wherein at least some of the alternating oxide and metal films are not in direct contact with one another.

18. The protective plate of claim 1, further comprising an anti-reflection layer.

19. The protective plate of claim 1, further comprising a colored film formed over said substrate and conductive film and configured to neutralize an overall color tone of the protective plate.

20. The protective plate of claim 1, further comprising a moisture resistant layer.

21. The protective plate of claim 1, wherein said protective plate has a resistance value of 1.0–

3.5 Ω

/□

.

22. A protective plate comprising:

glass substrate subjected to a strengthening treatment;

a colored ceramic layer formed around a periphery of a main surface of the glass substrate;

a conductive electrode formed around a periphery of said colored ceramic layer;

a conductive film formed on a middle portion of said main surface of the substrate and covering at least a portion of said colored ceramic layer and at least a portion of said conductive electrode, wherein the conductive film comprises;

a first oxide layer,

a first metal layer including Ag and formed on the first oxide layer,

a second oxide layer formed on the first metal layer,

a second metal layer including Ag and formed on the second oxide layer,

a third oxide layer formed on the second metal layer,

a third metal layer including Ag and formed on the third oxide layer, and

a fourth oxide layer formed on the third metal layer;

a colored film formed over said substrate and conductive film and configured to neutralize an overall color tone of the protective plate; and

an anti-reflective film formed over said substrate, conductive film and colored film.

23. The protective plate of claim 22, wherein at least one of said oxide layers comprises at least one metal oxide selected from the group consisting of Bi, Zr, Al, Ti, Sn, In and Zn.

24. The protective plate of claim 23, wherein said protective plate has a resistance value of 1.0–

3.5 Ω

/□

.

25. The protective plate of claim 23, further comprising a moisture resistant layer.

26. The protective plate of claim 22, wherein at least one of the oxide layers comprises a plurality of thin oxide layers.

27. A protective plate for a plasma display comprising:

a glass substrate;

a conductive electrode formed on a periphery of said glass substrate;

a film formed on the substrate and in contact with the electrode; and

means for providing said film with characteristics comprising;

conducting electricity a resistance value of 1.0–

3.5 Ω

/□

,

shielding electromagnetic waves, and

shielding near infrared rays.