JP2002318542A - Plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display device capable of preventing interference fringes from occurring while making the device thinner by reducing the gap between a front surface filter plate and a plasma display panel as much as possible. SOLUTION: The plasma display device comprised a PDP 2, a front surface filter plate 3, and particulate spacers 4... arranged to be interposed between them. The PDP 2 and the front surface filter plate 3 are constructed into one body by pressing somewhat the particulate spacers 4... in the direction of holding between them by a frame member not shown in figure. The particulate spacers 4 are made of, for example, transparent glass of 5 μm-10 μm spheres or bars. Moreover, these particulate spacers 4 have thermal conductivity higher than air, and have about the same refraction index as a transparent supporting substrate 3a.

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 having a plasma display panel.

[0002]

2. Description of the Related Art Plasma display panels (hereinafter referred to as P
DP) is, for example, a back side glass substrate and a front side glass substrate on which a number of linear electrodes are arranged at predetermined intervals, are bonded together such that the electrodes are orthogonal to each other,
It has a structure in which a gas composed of Xe (xenon) is filled between both substrates. A discharge cell will be formed at each position where the electrodes on the back side and the front side are orthogonal to each other, and when ultraviolet rays generated by discharge in this discharge cell hit the phosphor provided on the glass substrate on the back side or the front side Then, visible light is emitted from the phosphor. In the case of a full-color plasma display device, R is used as the phosphor.
(Red), G (green), and B (blue) light are emitted as a set, and many of them are arranged.

FIG. 4 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. From the PDP 31, a line spectrum in the near infrared region other than the visible light is generated, a part of which is emitted to the outside of the tube through the glass on the surface, and the electromagnetic wave generated by the discharge is also small. Leaks outside the tube. Further, when external light enters the display surface, the image contrast is reduced to make it difficult to see the screen, and the color purity of red display is reduced due to the emission line spectrum around 595 nm. For this reason, the front filter plate 42 is made of a transparent support substrate (glass, acrylic) 3
3 has an antireflection film 32 on the back surface (PDP side), and has a transparent adhesive material layer 34, a toning layer 35, a transparent adhesive material layer 36 on the front surface side.
Transparent film substrate (PET) 37, magnetic shielding layer 38, transparent adhesive layer 39, transparent film substrate 40, and antireflection film 4
1 has a laminated structure.

FIG. 5 is a sectional view showing an example of the internal structure of the plasma display device. The PDP 31 is mounted on one surface of the support substrate 51, and a circuit mounting substrate 54 on which a power supply circuit 53 and various circuits are mounted is mounted on the other surface. The support substrate 51 is fixed to a back panel 55, and the back panel 55 is attached to a housing 56. The four sides of the front filter plate 42 have support members 58.
Is fixed to the housing 56.

[0005] 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 space for air cooling deprives the heat released from the PDP 31 of the air, and the fan 6 provided at the upper end of the housing 56.
By 0, it is discharged outside the machine.

[0006]

The plasma display device is considered to be advantageous for use as a wall-mounted television, and it is important to reduce the thickness of the plasma display device. Is not sufficient in terms of thickness reduction. In addition, due to the presence of the space for air cooling, even if an anti-reflection layer is provided on the back surface of the front filter plate 42, its function is not perfect, and external light is two times between the back surface of the front filter plate 42 and the display surface of the PDP 31. There is a problem that the image is heavily reflected and the outline of the image is blurred. To prevent this double image, the front filter plate 4
If 2 is brought into close contact with the display surface of the PDP 31, the undulation of the transparent support base 33 may cause interference fringes due to the contact portion and the non-contact portion. Further, assuming that the film is directly attached without the transparent support base 33,
Problems such as an increase in the surface temperature of the PDP 31 and a reduction in the ability to prevent glass fragments from scattering when the PDP glass breaks occur.

The present invention has been made in view of the above circumstances, and provides a plasma display device capable of preventing the occurrence of interference fringes and the like while reducing the gap between the front filter plate and the plasma display panel as much as possible. With the goal.

[0008]

According to the plasma display device of the present invention, in order to solve the above-mentioned problems, a front filter plate having at least a functional layer for adjusting optical characteristics formed on a transparent hard substrate is formed by a plasma display device. The display panel is mounted on the front side via a particulate spacer. 5 μm as the particulate spacer
A spherical or rod-shaped material having a thickness of 10 μm to 10 μm can be used.

In the above configuration, since the particulate spacer is interposed between the front filter plate and the plasma display panel, direct contact between the front filter plate and the front surface of the plasma display panel can be avoided. However, no interference fringes occur. Then, the size of the particulate spacer (the diameter if it is spherical) is the distance between the front filter plate and the plasma display panel. Can be made thin, and the influence of double reflection is eliminated even if the antireflection layer on the back surface of the front filter plate is removed.

The thermal conductivity of the particulate spacer is preferably higher than that of air. According to this, the heat generated in the plasma display panel is conducted through the particulate spacers and is well radiated to the front filter plate side.

The refractive index of the particulate spacer is preferably about the same as that of the transparent hard substrate. According to this, unwanted refraction and reflection by the particulate spacer can be reduced.

Preferably, the functional layer includes at least one of a toning function layer, an electromagnetic wave prevention function layer, an external light reflection prevention function layer, and an infrared cut function layer.

[0013] The gap formed by the particulate spacer may be filled with a transparent liquid having higher thermal conductivity than air and sealed. Further, the gap formed by the particulate spacer may be filled and sealed with a transparent liquid having a refractive index substantially equal to that of the transparent hard substrate.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plasma display device according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a cross-sectional view of the plasma display device 1. The plasma display device 1 includes a plasma display panel (hereinafter abbreviated as PDP) 2
, A front filter plate 3, and particulate spacers 4 provided so as to be interposed between them. And
The PDP 2 and the front filter plate 3 are combined with the particulate spacer 4.
Are applied by a frame member (not shown) in the direction of sandwiching.

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

The front filter plate 3 is composed of a hard transparent supporting substrate 3a, a coloring material-containing pressure-sensitive adhesive 3b, a transparent film substrate 3c, a magnetic-shielding layer 3d, a transparent pressure-sensitive adhesive layer 3e, a transparent film substrate 3f, and an antireflection coating. It has a layer 3g in this order. More specifically, the transparent film substrate 3c and the magnetic shield layer 3d
And the transparent film substrate 3f and the antireflection layer 3g are integrated, and these are adhered to each other by the transparent adhesive layer 3e. It has a structure in which it is adhered to the transparent support base 3a with an adhesive 3b.

The transparent support substrate 3a is a high-hardness plate made of a transparent glass plate or a transparent resin (acrylic or the like) plate.
The surface is prevented from being distorted at the contact point with the particulate spacer 4. In this embodiment, the refractive index of the transparent support substrate 3a is substantially equal to the refractive index of the surface glass of the PDP 2.

The toning dye-containing adhesive material 3b absorbs near-infrared rays (about 800 nm to 1100 nm) and absorbs PDP 2
(Ne) emission spectrum from 595 nm
Is used. Specifically, 8
The transmittance at a wavelength of 00 nm or more is set to 10% or less, and
The dye is prepared so that the transmittance at the wavelength of nm is 20% or less. By absorbing near-infrared rays, malfunction 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.

The transparent film substrate 3c and the transparent film substrate 3f are made of a plastic film which is transparent in the visible light region, has flexibility so as to be easily bonded, and has excellent mechanical strength. For example, PET (polyethylene terephthalate), TAC (triacetyl cellulose), PC (polycarbonate), or the like can be used, but PET having excellent heat resistance is preferably used.

The magnetic shield layer 3d is made of an electromagnetic wave shielding metal film. Examples of the electromagnetic wave shielding metal include Ag, Al, Ni,
Au, Cu, or the like can be used, but it is preferable to form it with an Ag sputtered film in order to eliminate coloring. The magnetic shield layer 3d is not limited to a single layer, and may be a composite layer of two or more layers. As a forming method, a method such as vacuum evaporation and plating can be used in addition to sputtering.

The particulate spacer 4 is composed of particles smaller than the size corresponding to the resolution of the human eye.
It has a spherical or rod shape of μm to 10 μm. The particulate spacer 4 is made of a transparent glass or a transparent resin, has a thermal conductivity higher than that of air, and has a refractive index similar to that of the transparent support base 3a. The particulate spacer 4 is, for example, a PD below the gas ejection nozzle.
By arranging P2 and ejecting the particulate spacers 4 together with the gas, it is possible to spray the P2 substantially uniformly on the PDP2.

In the plasma display device 1 having such a structure, since the particulate spacers 4 are interposed between the front filter plate 3 and the PDP 2, direct contact between the front filter plate 3 and the front surface of the PDP 2 is achieved. Adhesion is avoided, and even if the transparent support substrate 3a has undulation, no interference fringes are generated. The size of the particulate spacer 4 (the diameter if it is spherical) is equal to that of the front filter plate 3 and the PD.
Although the distance between P2 and P2 is much smaller than the conventional heat radiation gap (several mm to 1 cm), the thickness of the device can be reduced accordingly, and the influence of double reflection can be obtained. Disappears. Further, since the thermal conductivity of the particulate spacers 4 is higher than that of air, the heat generated in the PDP 2 is conducted through the particulate spacers 4 and radiated well to the front filter plate 3 side. . Further, the particulate spacer 4
Since the refractive index is substantially the same as the refractive index of the transparent support substrate 3a, it is possible to reduce undesired refraction and reflection by the particulate spacer 4.

FIG. 2 shows an arrangement provided with a front filter plate 3 '. The front filter plate 3 'includes a hard transparent support substrate 3a, a color-adhesive material 3b for toning, a magnetic shield layer 3d, a transparent film substrate 3f, and an antireflection layer 3g in this order. More specifically, it has a structure in which a magnetic shield layer 3d, a transparent film substrate 3f, and an antireflection layer 3g are integrated, and are adhered to a transparent support substrate 3a with a toning dye-containing adhesive material 3b.

FIG. 3 shows a structure in which a gap formed by the particulate spacer 4 is filled with a transparent liquid 5 and sealed with a sealing material 6 arranged on the periphery. As the transparent liquid 5, it is desirable to use a liquid having a higher thermal conductivity than air and having a refractive index similar to that of the transparent support base 3a. Of course, the transparent liquid 5 is preferably excellent in nonflammability, thermal stability, and the like. Further, a function of adjusting optical characteristics, such as inclusion of a toning dye, may be provided.

[0026]

As described above, according to the plasma display device of the present invention, a state in which the front filter plate and the front surface of the plasma display panel are in close contact with each other is formed while avoiding direct contact. In addition to reducing the thickness, the antireflection layer formed on the contact surface can be removed, and the occurrence of interference fringes and the occurrence of double reflection can be eliminated. Further, in a configuration in which the thermal conductivity of the particulate spacer or the filling liquid is higher than that of air, the heat radiation of heat generated in the plasma display panel is improved. Further, in a configuration in which the refractive index of the particulate spacer or the filling liquid is substantially the same as the refractive index of the transparent hard substrate, undesired refraction and reflection by the particulate spacer can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a plasma display device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing another example of the plasma display device according to the embodiment of the present invention.

FIG. 3 is a sectional view showing another example of the plasma display device according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating a conventional plasma display device, and is a cross-sectional view illustrating details of a front filter.

FIG. 5 is a cross-sectional view showing a conventional plasma display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plasma display apparatus 2 Plasma display panel (PDP) 3 Front filter plate 3a Transparent support base 4 Particulate spacer 5 Transparent liquid 6 Sealing material

Continued on the front page F term (reference) 5C040 GH10 MA04 MA08 MA13 5C058 AA11 AB05 AB06 BA35 5G435 AA01 AA09 AA12 AA14 AA17 AA18 BB06 CC09 CC12 EE03 GG11 GG33 GG43 HH02 HH03 HH18

Claims (7)

[Claims] 1. A front filter plate comprising at least a functional layer for adjusting optical properties formed on a transparent hard substrate,
A plasma display device mounted on the front side of a plasma display panel via a particulate spacer smaller than the size corresponding to the resolution of human eyes. 2. The plasma display device according to claim 1, wherein the particulate spacer has a thickness of 5 μm to 10 μm.
A plasma display device having a spherical shape or a rod shape of μm. 3. The plasma display device according to claim 1, wherein the thermal conductivity of the particulate spacer is higher than that of air. 4. The plasma display device according to claim 1, wherein the refractive index of the particulate spacer is substantially equal to the refractive index of the transparent hard substrate. Plasma display device. 5. The plasma display device according to claim 1, wherein the functional layer comprises:
Toning function layer, electromagnetic wave prevention function layer, external light reflection prevention function layer,
And at least one of an infrared cut function layer. 6. The plasma display device according to claim 1, wherein a gap formed by said particulate spacer is filled with a transparent liquid having higher thermal conductivity than air. A plasma display device, which is stopped. 7. The plasma display device according to claim 1, wherein a refractive index in a gap formed by said particulate spacer is substantially equal to a refractive index of said transparent hard substrate. A plasma display device characterized by being filled with a transparent liquid and sealed.