JP2003066854A - Optical filter and plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical filter which makes excellent ground contact with an electromagnetic wave shield function layer and a plasma display device which can be made thin. SOLUTION: A front film type sheet 3 is formed by laminating a reflection preventive film 3a and an electromagnetic wave shield film 3b. The electromagnetic wave shield film 3b is formed of, for example, an electromagnetic wave shield metal film. The electromagnetic wave shield metal film is positioned on not the surface side of the PDP 2, but on the opposite side. The electromagnetic wave shield film 3b is larger than the reflection preventive film 3a and the edge part (metal film formation side) of the electromagnetic wave shield film 3b is exposed to make the excellent ground contact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical filter and a plasma display device.

[0002]

2. Description of the Related Art In a plasma display panel, for example, a back side glass substrate having a large number of linear electrodes arranged at a predetermined interval and a front side glass substrate are bonded to each other so that the electrodes are orthogonal to each other. It has a structure in which a gas such as Xe (xenon) is filled in between. A discharge cell will be formed at each position where the respective electrodes on the back surface side and the front surface side are orthogonal to each other, and when the ultraviolet rays generated by the discharge in this discharge cell hit the phosphor provided on the glass substrate on the back surface side or the front surface side. Visible light is emitted from this phosphor. In the case of a full-color plasma display device, the phosphors are R (red), G (green), and B.
A large number of units that emit light of (blue) will be arranged.

FIG. 3 is a sectional view showing a front filter plate 42 arranged on the front side of a plasma display panel (hereinafter abbreviated as PDP) 31. A line spectrum in the near-infrared region other than visible light is generated from the PDP 31, a part of which is emitted to the outside of the tube through the glass on the surface, and the electromagnetic wave generated due to the discharge is also small. Leaks out. Further, when external light is incident on the display surface, the image contrast is lowered to make it difficult to see the screen, or the color purity of red display is lowered due to the emission line spectrum near 595 nm. Therefore, the front filter plate 42 has the antireflection film 32 on the front surface side and the back surface side (PDP side) of the transparent support substrate (glass) 33. Further, an electromagnetic wave shielding functional layer 34 and a toning layer 35 are provided between the antireflection film 32 on the back surface side and the transparent supporting substrate 33.
The electromagnetic wave shield functional layer 34 is connected to the ground via a conductive tape 36.

FIG. 4 is a sectional view showing an example of the internal structure of the plasma display device. The PDP 31 is attached to one surface of the support substrate 51, and the power supply circuit 53 and a circuit mounting substrate 54 on which various circuits are mounted are attached to the other surface. The support substrate 51 is fixed to the back panel 55, and the back panel 55 is attached to the housing 56. The front filter plate 42 has support members 58 on its four sides.
It is fixed to the housing 56 by.

A space (several mm to 1 cm) for air cooling is formed between the PDP 31 and the front filter plate 42.
The air passing through the air-cooling space robs the heat emitted from the PDP 31, and the fan 6 provided at the upper end of the housing 56.
It will be discharged to the outside by 0.

[0006]

The plasma display device is considered to be advantageous for use as a wall-mounted television, and it is important to make the device thinner. However, in the plasma display device described above, the space for air cooling is used. Since it is provided, it is not sufficient in terms of thinning. In addition, the presence of the air-cooling space causes double reflection of external light between the back surface of the front filter plate 42 and the display surface of the PDP 31, causing a problem that the outline of the image is blurred. Further, it has been proposed to directly attach a film-like sheet for preventing double images, but in such a structure, there is no proposal for a good ground contact structure to the electromagnetic wave shielding functional layer.

In view of the above circumstances, an object of the present invention is to provide an optical filter capable of making good ground contact with an electromagnetic wave shielding functional layer and a plasma display device capable of being thinned.

[0008]

In order to solve the above problems, the optical filter of the present invention comprises a first film having an antireflection layer or an antiglare layer and an electromagnetic wave shielding functional layer. A second film, at least the first film is present on the side on which the electromagnetic wave shielding functional layer is formed, the second film is larger than the first film, and the edge portion of the electromagnetic wave shielding functional layer is Characterized by being exposed.

With the above structure, since the edge of the electromagnetic wave shielding functional layer is exposed, good electrical contact with the electromagnetic wave shielding functional layer can be achieved.

The exposed width of the edge portion is preferably 10 mm or more. Further, it is preferable that at least one of the near infrared ray cut layer and the toning layer is provided.

Further, the plasma display device of the present invention is characterized in that the above-mentioned optical filter is laminated such that the second film side thereof is positioned so as to face the front surface of the plasma display panel. The second film may be larger than the plasma display panel, and the edge of the second film may be located on the side surface of the plasma display panel. Further, the electromagnetic wave shield functional layer may be brought into electrical contact with the outside through a conductive tape attached to the exposed edge portion of the electromagnetic wave shield functional layer. Further, the conductive tape may be grounded via a conductor provided on the back surface side of the frame member.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An optical filter and a plasma display device according to an embodiment of the present invention will be described below with reference to FIGS.

1A and 1B are diagrams showing the main constituent members of the plasma display device 1 according to the first example. FIG. 1A is a sectional view and FIG. 1B is a front view. The plasma display device 1 includes a plasma display panel (hereinafter abbreviated as PDP) 2, a front film-like sheet 3 for preventing glass scattering, an outer frame 4, and a frame body (not shown). Front film sheet 3
Is located between the outer frame body 4 and the PDP 2, and when the outer frame body 4 is screwed to the frame body, for example, the outer frame body 4 presses the peripheral edge of the front film sheet 3. By this pressing, the front film-like sheet 3 is placed in close contact with the tube surface of the PDP 2. Of course, the front film-like sheet 3 may be adhered to the tube surface of the PDP 2 by using a transparent adhesive.

Although not shown in detail in the PDP 2, for example, a back side glass substrate and a front side glass substrate on which a large number of linear electrodes are arranged at predetermined intervals are bonded so that the electrodes are orthogonal to each other. , And has a structure in which a mixed gas of Xe (xenon) or Ne (neon) is filled between both substrates. A discharge cell will be formed at each position where the respective electrodes on the back surface side and the front surface side are orthogonal to each other, and when the ultraviolet rays generated by the discharge in this discharge cell hit the phosphor provided on the glass substrate on the back surface side or the front surface side. Visible light is emitted from this phosphor. When a full-color plasma display device is used, R (red) as a phosphor,
A large number of G (green) and B (blue) lights are arranged as one set.

The front film sheet 3 is formed by laminating an antireflection (AR) film 3a and an electromagnetic wave shielding film 3b. Each film is formed by forming each functional layer on a transparent film substrate, and the film substrates are attached to each other with a transparent adhesive. The overall thickness of the front film sheet 3 is determined in consideration of the glass scattering prevention ability and the like. Examples of the transparent film substrate include PET (polyethylene terephthalate),
TAC (triacetyl cellulose), PC (polycarbonate), or the like can be used, but PET having excellent heat resistance is preferably used.

An antiglare film may be provided in place of the antireflection film 3a. This antiglare film has a total visible light transmittance of 90% or more and a transmission haze value of 9% to 2 for example.
It is configured to be 0%. The antiglare film is formed by scattering diffusing materials or surface irregularities.

The electromagnetic wave shielding film 3b is formed by forming, for example, an electromagnetic wave shielding metal film. As the electromagnetic wave shielding metal, Ag, Al, Ni, Au, Cu or the like can be used, but it is preferable to form an Ag sputtered film in order to eliminate coloring. As a method of forming the electromagnetic wave shield film 3b, a method such as vacuum deposition or plating can be used in addition to sputtering. The electromagnetic wave shielding metal film is located not on the tube surface side of the PDP 2 but on the side opposite thereto.

The electromagnetic wave shield film 3b is larger than the antireflection film 3a, and the edge portion (metal film formation side) of the electromagnetic wave shield film 3b is exposed. The exposed width of this edge is set to 10 mm or more. In order to obtain such an exposed structure, for example, when the optical filter wound in a roll shape is pulled out and cut into a predetermined size, a cut is made at a position apart by, for example, 10 mm from the cut portion. The depth of this cut is the antireflection film 3a.
By matching the thickness of the electromagnetic wave shielding film 3
The antireflection film 3a on the edge of b can be removed by a width of 10 mm to expose the edge of the electromagnetic wave shielding film 3b.

A conductive rubber 5 is provided on the back surface side of the outer frame body 4. When the outer frame body 4 is mounted on a main body frame (not shown) by screws or the like, the mounting pressure of the outer frame body 4 causes an edge of the electromagnetic wave shielding film 3b. The conductive rubber 5 is pressed against the exposed portion. The conductive rubber 5 is connected to a conducting wire (metal foil or the like) formed on the back surface of the outer frame body 4. The conductor is connected to ground. In order to further improve the electrical contact between the conductive rubber 5 and the electromagnetic wave shielding film 3b, as shown in the figure, the exposed electromagnetic wave shielding film 3b is exposed.
It is preferable that the conductive tape 6 be attached to the edge portion of, and the electromagnetic wave shielding film 3b be electrically contacted with the conductive rubber 5 via the conductive tape 6.

FIG. 2 is a sectional view showing main constituent members of the plasma display device 1 according to the second example. The electromagnetic wave shielding film 10b in the front film sheet 10 is larger than the antireflection film 10a, and the edge portion of the electromagnetic wave shielding film 10b is exposed.
Further, the electromagnetic wave shield film 10b is made larger than the tube surface of the PDP 2, and the edge exposed portion of the electromagnetic wave shield film 10b is wrapped around the side surface of the PDP 2. Then, the conductive tape 6 is attached from the edge of the antireflection film 10a to the edge exposed portion (wraparound portion) of the electromagnetic wave shielding film 10b. When the outer frame body 4 is mounted on the main body frame (not shown), the conductive wire formed on the back surface side of the outer frame body 4 due to the mounting pressure is the conductive tape 6
Will be pressed against.

Incidentally, in addition to the antireflection layer and the electromagnetic wave shielding functional layer, a toning layer and a near infrared ray cutting layer (or a layer which serves as both of them) may be formed. Such a layer absorbs near infrared rays (about 800 nm to 1100 nm) and PD
595 is a Ne (neon) emission spectrum from P2.
It contains a dye that absorbs wavelengths of nm. Specifically, 8
The transmittance of wavelengths of 00 nm or more is set to 10% or less and 595
The dye is compounded so that the transmittance at a wavelength of nm is 20% or less. By absorbing near infrared rays, malfunctions of the infrared remote controller can be reduced, and by absorbing a wavelength of 595 nm, orange components can be reduced and red purity can be improved.

[0022]

As described above, according to the present invention, the second film formed with the electromagnetic wave shielding functional layer is made larger than the first film formed with the antireflection layer or the antiglare layer. Since the edge portion of the electromagnetic wave shielding functional layer is exposed, it is possible to achieve good electrical contact with the electromagnetic wave shielding functional layer. Since such an optical filter is attached to the surface of the plasma display panel, the plasma display device can be thinned.

[Brief description of drawings]

FIG. 1 is a view showing main constituent members of a plasma display device according to a first example of the present invention, and FIG.
Is a sectional view, and FIG.

FIG. 2 is a sectional view showing main constituent members of a plasma display device according to a second example of the present invention.

FIG. 3 is a cross-sectional view schematically showing a conventional plasma display device having a cooling gap.

FIG. 4 is a cross-sectional view showing a conventional plasma display device.

[Explanation of symbols]

1 Plasma display device 2 Plasma display panel (PDP) 3 Front film sheet 4 Outer frame 5 Conductive rubber 6 Conductive tape

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification symbol FI theme code (reference) G02B 5/22 H04N 5/66 101A 5G435 H01J 11/02 5/72 A H04N 5/66 101 H05K 9/00 V 5/72 G02B 1/10 A H05K 9/00 Z F term (reference) 2H048 AA07 AA11 AA16 AA19 AA24 AA27 2K009 AA04 BB24 BB28 CC09 CC14 DD01 DD04 EE00 5C040 GH10 MA04 MA08 5C058 AA11 AB321 DA08 DA08 DA08 DA08 DA08 DA08 DA08 DA08 BB23 CC16 5G435 AA16 AA18 BB06 CC09 FF03 FF14 GG33 GG43 LL04

Claims (7)

[Claims] 1. A first film formed with an antireflection layer or an antiglare layer and a second film formed with an electromagnetic wave shielding functional layer.
A first film is present on the side on which the electromagnetic wave shielding functional layer is formed,
An optical filter, wherein the second film is larger than the first film and the edge of the electromagnetic wave shielding functional layer is exposed. 2. The optical filter according to claim 1, wherein the exposed width of the edge portion is 10 mm or more. 3. The optical filter according to claim 1 or 2, further comprising at least one of a near infrared ray cut layer and a toning layer. 4. A plasma, characterized in that the optical filter according to any one of claims 1 to 3 is bonded so that the second film side thereof is positioned so as to face the front surface of the plasma display panel. Display device. 5. The plasma display device according to claim 4, wherein the second plasma display panel is more than the second plasma display panel.
The plasma display device is characterized in that the film is larger and the edge of the second film is located on the side surface of the plasma display panel. 6. The plasma display device according to claim 4 or 5, wherein the electromagnetic wave shielding functional layer electrically contacts with the outside through a conductive tape attached to an edge exposed portion of the electromagnetic wave shielding functional layer. A plasma display device characterized by: 7. The plasma display device according to claim 6, wherein the conductive tape is grounded via a conductor provided on the back surface side of the frame member.