JPH0951494A - Plasma display device with optical filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce spurious radiation from a front side of the plasma display device by using effectively the optical filter for countermeasures against unwanted radiation. SOLUTION: The optical filter 2 on a front face of the plasma display device PDP 3 is fitted behind a display window 1a of a case front frame 1 of the display device. A video image displayed on the PDP is seen through the display window 1a externally. A conductive film 2b made of an ITO or the like is formed on one side of the optical filter 2. A conductive paint 1b with a low sheet resistance of 5 ohm-square is painted to an inside of the case front frame 1 and in contact with the conductive film 2b of the optical filter 2 via a projection 1c in electric contact therewith. A hole 2d is made to four corners of the optical filter 2 and a thread hole is made to a part corresponding to the projection 1c of the case front frame 1 and the conductive film 2b of the optical filter 2 is in contact with the projection 1c of the case front frame 1 and fastened by a screw 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device with an optical filter for displaying television images and the like with less unnecessary radiation of radio waves.

[0002]

2. Description of the Related Art In a plasma display device using a PDP, since an impulse-shaped discharge current flows, unnecessary radiation of radio waves is likely to occur. On the other hand, an optical filter is used on the front surface of the display to improve the display characteristics of the display. However, since this optical filter is naturally required to have optical transparency, it is difficult to have conductivity and thus unnecessary. It is difficult to prevent radiation. Therefore, there is a problem that unnecessary radiation from the front surface of the plasma display device is large.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an optical filter is effectively used as a countermeasure against unwanted radiation of radio waves to reduce unwanted radiation from the front surface of the plasma display device. It is in.

[0004]

A conductive film is formed on a front frame of a housing of an optical filter and a plasma display device, and the conductive film formed on the optical filter and the conductive film formed on the front frame of the housing are electrically connected to each other. The conductive film of the optical filter and the conductive film of the front frame of the housing are electrically bonded to each other to form an integrated type.

The area resistance of the conductive film on the front frame of the housing is made of conductive paint having a resistance of 5 Ω □ or less.

A projection that is convex toward the optical filter is provided at the joint between the conductive film of the front frame of the housing and the conductive film of the optical filter.

The conductive film of the optical filter is formed of an ITO film.

[0008] The conductive film of the optical filter is covered with plastic except for the joint portion which makes electrical contact with the conductive film of the front frame of the housing.

A hole for screwing is provided in the joint portion of the conductive film of the optical filter and the joint portion of the conductive film of the front frame of the housing, and the joint portion of the conductive film of the optical filter is connected to the conductive film of the front frame of the casing. Screw it to the joint part.

[0010]

The conductive film is formed on the front frame of the optical filter and the case of the plasma display device, and the conductive film formed on the optical filter and the conductive film formed on the front frame of the case are electrically connected to each other. The electrically conductive film of the optical filter and the electrically conductive film of the front frame of the housing are electrically joined to form an integrated type, whereby relatively low conductivity of the optical filter is reinforced,
It becomes easy to take measures against unnecessary radiation of radio waves from the front surface of the plasma display device.

Even if the front frame of the housing is made of an insulating material such as plastic, it is possible to take measures against unwanted radiation by using conductive paint having a conductive film of the conductive film of the front frame of the housing of 5 Ω □ or less.

A conductive film of the optical filter and a conductive film of the front frame of the housing are provided by providing a projection that is convex toward the optical filter at a joint portion of the conductive film of the front frame of the housing with the conductive film of the optical filter. Facilitates electrical contact with the membrane.

By forming the conductive film of the optical filter with an ITO film, it is possible to give conductivity without impairing the transparency of the optical filter.

The conductive film of the optical filter is covered with plastic except for the joint portion which is in electrical contact with the conductive film of the front frame of the housing to protect the conductive film of the optical filter such as an ITO film from damage due to abrasion. it can.

A hole for screwing is provided in the joint portion of the conductive film of the optical filter and the joint portion of the conductive film of the front frame of the housing, and the joint portion of the conductive film of the optical filter is formed in the conductive film of the front frame of the casing. By screwing the optical filter to the joint portion of the optical filter, electrical connection between the conductive film of the optical filter and the conductive film of the front frame of the housing is ensured, and the work of attaching the optical filter to the device is facilitated.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A plasma display device with an optical filter according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a plan view (cross section) of a main part (A) of a plasma display device with an optical filter according to the present invention, (B).
It is a front view. An optical filter 2 is provided on the front surface of a PDP 3 of the plasma display device, and the optical filter 2 is attached behind the display window 1a of the front frame 1 of the housing of the display device. The optical filter 2 functions to suppress the reflection of external light and improve the contrast ratio of the image displayed on the PDP, and the image displayed on the PDP can be viewed from the outside through the display window 1a. A conductive film 2b made of ITO (yttrium tin oxide) or the like is formed on one surface of the optical filter 2. The inside of the front frame 1 of the housing is coated with a conductive paint 1b having a low sheet resistance of 5Ω □ or less, and is joined to the conductive film 2b of the optical filter 2 via a protrusion 1c that electrically contacts the paint. . The conductive film is not limited to the conductive paint, and naturally, the same effect can be obtained with, for example, a copper foil.

While holes 2d are provided at the four corners of the optical filter 2, screw holes are also provided in the corresponding portions of the protrusions 1c of the front frame 1 of the housing, and the conductive film 2b of the optical filter 2 is fixed by the screw 4 to the front frame of the housing. The protrusion 1c of No. 1 is contacted and screwed.

On the surface of the conductive film 2b of the optical filter 2,
A plastic 2c for protecting the conductive film 2b is provided. The plastic 2c covers the entire surface of the conductive portion 2b of the optical filter 2 except for the portion where the conductive film 2b of the optical filter 2 contacts the protruding portion 1c of the front frame 1 of the housing.

[0019]

As described above, the conductive film of the optical filter for improving the display characteristics of the PDP is provided with the conductive film, and the conductive film is electrically integrated with the conductive film of the front frame of the housing. As a result, the unnecessary radiation emitted from the PDP can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view (cross section) of a main part (A) and a front view (B) of a plasma display device with an optical filter according to the present invention.

[Explanation of symbols]

 1 Front Frame 1a Display Window 1b Conductive Film 1c Protrusion 2 Optical Filter 2b Conductive Film 2c Plastic 2d Hole 3 PDP 4 Screw

Claims (6)

[Claims] 1. PDP (Plasma Display Panel)
In a plasma display device having an optical filter mounted on the front surface for improving image display characteristics, etc., a conductive film is formed on the optical filter and a front frame of a casing of the plasma display device, and the conductive film is formed on the optical filter. And a bonding portion for electrically contacting the conductive film formed on the front frame of the housing, and the conductive film of the optical filter and the conductive film of the front frame of the housing are electrically bonded to form an integral type. A plasma display device with a featured optical filter. 2. The sheet resistance of the conductive film on the front frame of the housing is 5 Ω □
The plasma display device with an optical filter according to claim 1, wherein the following conductive paint is used. 3. The method according to claim 1, wherein a joint portion of the conductive film of the front frame of the housing with the conductive film of the optical filter has a protrusion that is convex toward the optical filter. Plasma display device with optical filter. 4. The conductive film of the optical filter comprises an ITO film, claim 2, or claim 3.
A plasma display device with an optical filter as described above. 5. The conductive film of the optical filter is covered with plastic except for a joint portion which is in electrical contact with the conductive film of the front frame of the housing.
A plasma display device with an optical filter according to claim 3 or 4. 6. A hole for screwing is provided in a joint portion of the conductive film of the optical filter and a joint portion of the conductive film of the front frame of the housing, and the joint portion of the conductive film of the optical filter is connected to the front frame of the casing. The screw is fixed to the joint portion of the conductive film,
A plasma display device with an optical filter according to claim 2, claim 3, claim 4, or claim 5.