JP2002372917A - Plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the electromagnetic shield performance with a simple constitution in a plasma display device. SOLUTION: This device is provided with a front surface filter 23 arranged at a front surface side of a panel and having an electromagnetic shield layer 25 and a front surface cabinet 21 holding a peripheral part of this front surface filter 23 by holding it with a pressing metal 28 and the cabinet between them, a conduction tape 26 connected electrically to the electromagnetic shield layer 25 is provided at a peripheral part of the front surface filter 23, the electromagnetic shield layer can be made double and the electromagnetic shield performance can be enhanced by holding a peripheral part of the front surface filter 23 with the front surface cabinet 21 and the pressing metal 28 between them through conductive sponges 29a, 29b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large screen,
The present invention relates to a method for manufacturing a plasma display device known as a lightweight display device.

[0002]

2. Description of the Related Art In a plasma display apparatus of this type, an ultraviolet ray is generated by gas discharge, and a phosphor is excited by the ultraviolet ray to emit light, thereby performing color display. Further, a display cell partitioned by a partition is provided on the substrate, and the display cell has a configuration in which a phosphor layer is formed.

This plasma display device is roughly classified into an AC type and a DC type in terms of driving, and there are two types of discharge types, a surface discharge type and a counter discharge type. At present, the mainstream of plasma display devices is a surface discharge type having a three-electrode structure, which has a pair of display electrodes that are adjacent to each other in parallel on one substrate, and the other is a plasma display device. It has address electrodes arranged on the substrate in a direction intersecting the display electrodes, partition walls, and a phosphor layer. The phosphor layer can be made relatively thick, which is suitable for color display by phosphor.

FIG. 4 shows a structure of a panel in a plasma display device. As shown in FIG. 4, on a transparent front substrate 1 such as a glass substrate, a plurality of stripe-shaped display electrodes 2 formed of pairs of scan electrodes and sustain electrodes are formed, and cover the electrode group. The dielectric layer 3 is formed as described above, and a protective film 4 is formed on the dielectric layer 3.

[0005] A plurality of columns covered with an overcoat layer 6 are provided on a rear substrate 5 opposed to the front substrate 1 so as to cross the display electrodes 2 of scan electrodes and sustain electrodes. Are formed. A plurality of barrier ribs 8 are arranged on the overcoat layer 6 between the address electrodes 7 in parallel with the address electrodes 7, and the phosphor layers 9 are provided on the side surfaces between the barrier ribs 8 and on the surface of the overcoat layer 6. I have.

The substrate 1 and the substrate 5 are provided with a display electrode 2 of a scan electrode and a sustain electrode and an address electrode 7.
Are arranged so as to be substantially orthogonal to each other with a minute discharge space interposed therebetween, the periphery thereof is sealed, and one or a mixed gas of helium, neon, argon, and xenon is discharged in the discharge space. Sealed as gas. The discharge space is divided into a plurality of sections by the partition walls 8, so that a plurality of discharge cells are provided at intersections between the display electrodes 2 and the address electrodes 7, and each of the discharge cells has a red, green, and blue color. The phosphor layers 9 are sequentially arranged one by one so that

FIG. 5 shows an electrode arrangement of the plasma display panel. As shown in FIG. 5, the scan electrodes, the sustain electrodes, and the address electrodes have a matrix configuration of M rows × N columns, and the scan electrodes SCN1 to SCNM and the sustain electrodes SUS1 to SUS1 of M rows are arranged in the row direction.
SUSM are arranged, and N columns of address electrodes D1 are arranged in the column direction.
To DN are arranged.

In the plasma display panel having such an electrode configuration, an address discharge is performed between the address electrode and the scan electrode by applying a write pulse between the address electrode and the scan electrode, and after a discharge cell is selected. , Between the scan electrode and the sustain electrode,
By applying a periodic sustain pulse that is alternately inverted, a sustain discharge is performed between the scan electrode and the sustain electrode, and a predetermined display is performed.

FIG. 6 shows an example of the overall configuration of a plasma display device incorporating a panel having the structure described above. In the figure, a housing for accommodating the panel 10 is:
The front cabinet 1 is composed of a front cabinet 11 and a metal back cover 12 and is located on the front side of the panel 10.
A front filter 13 made of glass or the like which also protects the optical filter and the panel 10 is disposed in the opening 1. The front filter 13 is, for example, silver-deposited as an electromagnetic wave shielding layer in order to suppress unnecessary radiation of electromagnetic waves. Further, the back cover 12
Is provided with a plurality of ventilation holes 12a for releasing heat generated in the panel 10 and the like to the outside.

The panel 10 is provided on the front surface of a chassis member 14 as a holding plate also serving as a heat radiating plate made of aluminum or the like via a double-sided adhesive or a heat conductive sheet 15 made of an acrylic, urethane, or silicon material. A plurality of circuit blocks 16 for driving the display of the panel 10 are mounted on the rear side of the chassis member 14 by being adhered. The heat conduction sheet 15 transfers heat generated by the panel 10 to the chassis member 14.
It is intended to transmit heat efficiently and to dissipate heat. Also,
The circuit block 16 includes an electric circuit for driving and controlling the display of the panel 10, and includes a plurality of electrodes extending beyond the four edges of the chassis member 14 at electrode extraction portions extended to the edge of the panel 10. Are electrically connected by a flexible wiring board (not shown).

A boss 14a for attaching the circuit block 16 and fixing the back cover 12 is formed on the rear surface of the chassis member 14 by integral molding using die casting or the like. The chassis member 14
May be configured by fixing a fixing pin to an aluminum flat plate.

[0012]

Such a plasma display device can display images at a higher speed than a liquid crystal panel, has a wide viewing angle, is easy to increase in size, and is a self-luminous type. Due to high display quality, it has recently attracted particular attention among flat panel displays.It is characterized by its large size, light weight, thin shape, and wide viewing angle in addition to general household use. It is also used for business such as transportation, amusement, medical care, etc. that can be seen at once.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to enhance the electromagnetic wave shielding performance of a plasma display device with a simple configuration.

[0014]

In order to achieve the above object, the present invention provides a front filter having an electromagnetic wave shielding layer disposed on the front side of a panel and having an electromagnetic wave shielding layer on at least one side, and a holding metal fitting for a peripheral portion of the front filter. Having a front cabinet that is held by being sandwiched in, provided with a conductive portion that is electrically connected to the electromagnetic wave shielding layer from one surface to the other surface at a peripheral portion of the front filter,
In addition, the conductive portion of the front filter is electrically connected to the front cabinet and the holding member via the conductive member by sandwiching the peripheral portion of the front filter between the front cabinet and the holding member via the conductive member. .

With this configuration, the electromagnetic wave shielding layer can be doubled, and the electromagnetic wave shielding performance can be improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, the invention according to the first aspect of the present invention has a plurality of discharge cells which are arranged so as to oppose each other so that a discharge space is formed between the pair of substrates at least on the front side. A panel, a front filter disposed on the front side of the panel and having an electromagnetic wave shielding layer on at least one side, and a front cabinet for holding the periphery of the front filter by being clamped by a holding metal, and A conductive portion that is electrically connected to the electromagnetic wave shielding layer from one surface to the other surface is provided on a peripheral portion of the filter, and the peripheral portion of the front filter is sandwiched between the front cabinet and the holding metal via a conductive member. By doing so, the conductive portion of the front filter is electrically connected to the front cabinet and the holding member via a conductive member.

Further, the invention according to claim 2 of the present invention provides
It has a back cover that forms a housing with the front cabinet, and the back cover is electrically connected to the front cabinet and the holding metal.

Hereinafter, a plasma display device according to an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows the appearance of a plasma display device according to an embodiment of the present invention, and FIG. 2 shows the main structure of the plasma display device.
Reference numeral 0 denotes a front cabinet 21 and a back cover 22 which constitute a housing for accommodating a panel as shown in FIG.
And a front filter 23 arranged on the front side of the panel. 24 is the plasma display device 2
This is a stand for holding 0 in a stationary state.

As shown in FIG. 2, an electromagnetic wave shielding layer 25 is provided on one side of the front side filter 23 made of glass or the like disposed on the front side of the panel on the panel side. A conductive tape 26 serving as a conductive portion that is electrically connected to the electromagnetic wave shielding layer 25 is attached from one surface to the other surface by bonding.

The front filter 23 includes an opening peripheral portion 21a of the front cabinet 21 and a press fitting 28 attached to the opening peripheral portion 21a with a screw 27.
And the front edge of the front cabinet 2
It is held at 1. A conductive sponge 29, which is a conductive member having elasticity, is provided on a peripheral edge portion of the front filter 23 held by the front cabinet 21 and the holding member 28.
a, 29b are arranged, and the conductive sponge 29
a, 29b and the front cabinet 21 and the presser fitting 2
8, the conductive tape 26 of the front filter 23 is electrically connected to the front cabinet 21 and the press fitting 28 via conductive sponges 29a and 29b.

A back cover 22 which forms a housing with the front cabinet 21 is fixed to a chassis member by screws, and a peripheral portion of the back cover 22 is attached to the holding member 28 by a conductive member. It is pressed through a conductive sponge 30, whereby the back cover 22 is electrically connected to the front cabinet 21 and the press fitting 28.

Here, the front cabinet 21 and the back cover 22 are made of metal as a whole, or are made by plating a resin molded product or applying a conductive paint or the like so that conduction can be obtained. May be used.

The front filter 23 may be provided with an electromagnetic wave shielding layer 25 on both sides as shown in FIG. 3 in addition to providing the electromagnetic wave shielding layer 25 on one of the front surface and the back surface as shown in FIG. Also in this case, a conductive portion is provided by attaching a conductive tape 26 or the like to the peripheral portion.

Next, a description will be given of a case where the front filter is attached to the plasma display device according to the present embodiment. First, in the peripheral portion 21a of the opening of the front cabinet 21, a portion where the inner front filter 23 contacts is electrically conductive. Sex sponge 29a is pasted.
Then, the front filter 23 is placed on the peripheral edge portion 21 a of the opening of the front cabinet 21, and the presser fitting 28 is fixed with screws 27 from behind. At this time, conductive sponges 29b and 30 are pasted on both ends of the holding member 28.

Lastly, the back cover 22 is attached. At this time, by connecting the back cover 22 to the ground of the internal printed circuit board, the electromagnetic wave shielding layer 25 of the front filter 23 becomes conductive tape 26 , Conductive sponge 29a, front cabinet 21,
Presser fitting 28, conductive sponge 30, back cover 22
And the connection path of the rear conductive sponge 29b, the presser fitting 28, the conductive sponge 30, and the back cover 22 are connected to the ground.

That is, with this configuration, the electromagnetic wave shield of the front cabinet 21 can be doubled.

[0028]

As described above, according to the present invention, the electromagnetic shielding surfaces of the front cabinet, the front filter, and the front cabinet can be doubled, and the electromagnetic shielding performance can be improved.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing a main configuration of the plasma display device.

FIG. 3 is a cross-sectional view showing a main configuration of a plasma display device according to another embodiment of the present invention.

FIG. 4 is a perspective view showing a panel structure of the plasma display device.

FIG. 5 is an explanatory view showing an electrode arrangement of the panel.

FIG. 6 is an exploded perspective view showing the overall configuration of the plasma display device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 20 plasma display device 21 front cabinet 22 back cover 23 front filter 25 electromagnetic wave shielding layer 26 conductive tape 28 holding metal fittings 29a, 29b, 30 conductive sponge

Claims (2)

[Claims] 1. A panel having a plurality of discharge cells and a pair of substrates disposed at least on the front side facing each other so that a discharge space is formed between the substrates, and a panel disposed on the front side of the panel and provided on at least one side. A front filter having an electromagnetic wave shielding layer, and a front cabinet for holding the front filter by sandwiching a peripheral portion of the front filter with a holding member, wherein the electromagnetic wave extends from one surface to the other surface at the peripheral edge of the front filter. By providing a conductive portion that is electrically connected to the shield layer, and by sandwiching the peripheral edge of the front filter between the front cabinet and the presser fitting via the conductive member, the conductive portion of the front filter is connected via the conductive member. A plasma display device electrically connected to the front cabinet and a holding member. 2. The plasma display device according to claim 1, further comprising a back cover that forms a housing with the front cabinet, wherein the back cover is electrically connected to the front cabinet and a holding member.