# US 7,612,490 B2 · Plasma display apparatus with optical filter and elastic conductive body

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- Number: US 7,612,490 B2
- Document ID: US7612490B2
- Status: Granted
- Kind: B2
- Application number: 11/515,822
- Filed: 2006-09-06
- Published: 2007-08-09
- Granted: 2009-11-03
- Earliest claimed: 2006-02-03
- Assignees: Hitachi, Ltd.
- Inventors: Hidenao Kubota; Yutaka Yamada
- Web page: https://patentgrep.com/patent/US7612490B2

## CPC

- H01J 11/44: Optical arrangements or shielding arrangements, e.g. filters, black matrices, light reflecting means or electromagnetic shielding means
- H05K 9/0054: {specially adapted for display applications}
- H01J 2211/446: Electromagnetic shielding means; Antistatic means
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A plasma display apparatus includes a conductive rear surface cover covering a rear surface of a plasma display panel; an optical filter provided with a conductive layer having a surface resistance of 0.5 Ω/square or above, which is disposed at the front surface of the plasma display panel and serves to reduce leakage of electromagnetic waves from the plasma display panel; an optical filter fixing member electrically connected with the rear surface cover, for at least retaining the optical filter; and a conductive body having elasticity, which is interposed between the optical filter and the optical filter fixing member. A plurality of bosses are formed in the optical filter fixing member. A part of the elastic conductive body is compressed by the bosses and connection resistance with the elastic conductive body is reduced.

## Claims

### Claim 1

A plasma display apparatus, comprising:
a plasma display panel;
a conductive rear surface cover covering a rear surface of the plasma display panel;
an optical filter provided with a conductive layer having a surface resistance of 0.5 Ω/square or above, which is disposed at the front surface of the plasma display panel and serves to reduce leakage of electromagnetic waves from the plasma display panel;
an optical filter fixing member electrically connected with the rear surface cover, for at least retaining the optical filter; and
a conductive body having elasticity, which is interposed between the optical filter and the optical filter fixing member;
wherein a plurality of bosses are formed in the optical filter fixing member, and a part of the elastic conductive body is compressed by the bosses, thereby electrically connecting an electric connection portion of the optical filter with the optical filter fixing member; and
wherein K1 (%) denotes compressibility of the elastic conductive body in an area where no bosses are formed in the fixing member, and K2 (%) denotes compressibility of the elastic conductive body in an area where the bosses are formed in the fixing member, and a ratio of compressibility of K1 and K2 satisfy the following condition:
1<K1/K2<2.66.

### Claim 2 (depends on 1)

The plasma display apparatus of claim 1, wherein a thickness of the elastic conductive body before installation is about 3.0 mm, a gap between the conductive optical filter and the optical filter fixing member is about 2.0 mm, and a height of the boss is about 1.2 mm.

### Claim 3 (depends on 1)

The plasma display apparatus of claim 1, wherein the elastic conductive body is a gasket.

### Claim 4 (depends on 1)

The plasma display apparatus of claim 1, wherein a ratio of a height of the boss to a thickness of the elastic conductive body before installation is less than 0.5.

### Claim 5 (depends on 1)

The plasma display apparatus of claim 1, wherein the optical filter fixing member reduces leakage of electromagnetic waves at least from a peripheral portion of the optical filter.