LCD device having a noise-shield layer directly between LCD and EL panel

• US 6,456,342 B1
• Filed: 02/26/1999
• Issued: 09/24/2002
• Est. Priority Date: 02/27/1998
• Status: Expired due to Term

• Current Assignee: Lenovo Innovations Ltd Hong Kong (Lenovo Group Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Takenaka, Hidetoshi
• Primary Examiner(s): Ton, Toan
• Application Number:
  US09/258,075
• Publication Number:
  US 20020024624A1
• Time in Patent Office: 1,306 Days
• Field of Search: 349/40, 349/58, 349/110, 349/65, 349/50, 361/31, 361/32
• US Class Current: 349/58
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133334 Electromagnetic shields
• CPC Class Codes: G02F 1/133604 with lamps
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements

Abstract

A liquid crystal display device includes a shield layer for acoustic noise prevention between an LCD and an EL panel serving as a backlight source for the LCD. The shield layer is fixed to the surface of the EL panel by adhesion.

Claims

1. A liquid crystal display device comprising a shield layer for acoustic noise prevention between an LCD and an EL panel serving as a backlight source for said LCD;

wherein said shield layer is in direct contact with a surface of said EL panel.

2. A device according to claim 1, wherein said shield layer is fixed to said LCD by adhesion.

3. A device according to claim 2, wherein said shield layer is fixed to said LCD with double-coated tape.

4. A device according to claim 1, wherein said shield layer is a transparent electrode layer connected to ground.

5. A device according to claim 4, wherein said transparent electrode layer is formed on one entire surface of said EL panel.

6. A device according to claim 1, wherein said transparent electrode layer has an impedance set to less than several ten kΩ

.

7. A device according to claim 1, wherein said shield layer is a conductor selected from a group consisting of an ITO foil, an aluminum foil and silver foil.

8. A liquid crystal display device comprising:

a ground plate between an LCD and an EL panel; and

a shield layer in direct contact with a surface of said EL panel,

wherein said EL panel serves as a backlight source for said LCD.

9. A device according to claim 8, wherein said ground plate is formed by forming a transparent electrode layer on one surface of a PET film.

10. A liquid crystal display device, comprising:

a circuit board;

an EL panel, wherein said EL panel is positioned on top of said circuit board and said EL panel serves as a backlight;

a noise prevention shield layer, wherein said EL panel is positioned between said noise prevention shield layer and said circuit board; and

a liquid crystal display, wherein said noise prevention shield layer is positioned between said liquid crystal display and said EL panel, and said EL panel serves as said backlight for said liquid cystal display;

wherein said noise prevention shield layer is in direct contact with said surface of said EL panel.

11. A device according to claim 10, wherein said noise prevention shield layer is fixed to said liquid crystal display by adhesion.

12. A device according to claim 11, wherein said noise prevention shield layer is fixed to said liquid crystal display by double-coated tape.

13. A device according to claim 12, wherein said double-coated tape is about 0.1 μ

m thick.

14. A device according to claim 10, wherein said noise prevention shield layer is a transparent electrode layer connected to a ground.

15. A device according to claim 14, wherein said transparent electrode layer is formed on one entire surface of said EL panel.

16. A device according to claim 14, wherein said transparent electrode layer has an impedance set to less than several tens of kΩ

.

17. A device according to claim 14, further comprising a PET film, wherein said PET film is positioned between said transparent electrode layer and said EL panel.

18. A device according to claim 14, wherein said transparent electrode layer is formed on a surface of said PET film by vapor deposition and patterned to conform to said EL panel.

19. A device according to claim 14, further comprising a ground plate, wherein said ground plate has a PET film formed on one surface of said ground plate and said transparent elecrode layer is formed on said PET film.

20. A device according to claim 10, wherein said shield layer is a conductor selected from a group consisting of an ITO foil, an aluminum foil and a silver foil.