JP2003043944A - Plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the weight of a plasma display device lighter. SOLUTION: This plasma display device has a panel 10 which is opposed and arranged with a pair of substrates which is transparent on at least the front side in a manner as to form an electric discharge space between the substrates and is disposed with electrode groups, a chassis member 14 which is arranged on the back side of the panel 10, a display driving circuit block which is arranged at this chassis member 14 and makes display by impressing a signal to the panel and a casing which has a front cabinet 11 for protecting the outer peripheral part of the panel 10 and a back cover 12 for protecting the display driving circuit block side. The front cabinet 11 is constituted by molding a denatured polyphenylene ether resin to a frame shape.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a large screen, thin type,
The present invention relates to a plasma display device known as a lightweight display device.

[0002]

2. Description of the Related Art In this plasma display device, ultraviolet rays are generated by gas discharge, and phosphors are excited by the ultraviolet rays to emit light to perform color display. The display cell partitioned by the partition is provided on the substrate, and the phosphor layer is formed on the display cell.

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. However, high definition, large screen and Due to the ease of manufacturing, at present, the mainstream plasma display device is a surface discharge type of three-electrode structure, which has a pair of display electrodes adjacent in parallel on one substrate and the other. It has address electrodes arranged in a direction intersecting with the display electrodes on the substrate, partition walls, and a phosphor layer. Since the phosphor layer can be relatively thick, it is suitable for color display by the phosphor.

Such a plasma display device is
Among the flat panel displays, it is possible to display at a higher speed than a liquid crystal panel, has a wide viewing angle, is easy to upsize, and has a high display quality due to its self-luminous type. It has been particularly attracting attention and is used for various purposes as a display device in a place where many people gather and as a display device for enjoying a large-screen image at home.

[0005]

On the other hand, as the plasma display device is used for various purposes, there is a strong demand for weight reduction of the plasma display device from the viewpoint of workability when it is installed on a wall surface. In addition, there is a strong demand for a cheaper device in terms of price.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a plasma display device which can be further reduced in weight.

[0007]

To achieve the above object, in a plasma display device of the present invention, a pair of substrates, at least the front side of which is transparent, are arranged so as to face each other so that a discharge space is formed between the substrates, and the substrates are mounted on the substrates. A panel on which the electrode group is arranged, a chassis member arranged on the back side of the panel, a display drive circuit block which is arranged on the chassis member and applies a signal to the panel to perform display, and an outer peripheral portion of the panel. A front cabinet for protection and a casing made of a back cover for protecting the display drive circuit block side are provided, and the front cabinet is formed by molding a modified polyphenylene ether resin into a frame shape.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, according to the first aspect of the present invention, a pair of substrates, at least the front side of which are transparent, are arranged so as to face each other so that a discharge space is formed between the substrates, and an electrode group is arranged on the substrates. Panel, a chassis member arranged on the back side of the panel, a display drive circuit block arranged on the chassis member and applying a signal to the panel for display, and a front cabinet for protecting the outer peripheral portion of the panel. And a casing formed of a back cover for protecting the display drive circuit block side, wherein the front cabinet is formed by molding a modified polyphenylene ether resin into a frame shape, and the invention according to claim 2 Then, the front cabinet is a modified polyphenylene ether resin that has a deflection temperature under load of 85 ° C or higher and uses a halogen-free flame retardant. It is characterized in that constructed by molding a frame shape.

A plasma display device according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 5, but the embodiment of the present invention is not limited to this.

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

A plurality of columns covered with an overcoat layer 6 are formed on the rear substrate 5 facing the front substrate 1 so as to intersect the display electrodes 2 of the scan electrodes and the sustain electrodes. Stripe-shaped address electrodes 7 are formed. A plurality of partition walls 8 are arranged on the overcoat layer 6 between the address electrodes 7 in parallel with the address electrodes 7, and a phosphor layer 9 is provided on a side surface between the partition walls 8 and a surface of the overcoat layer 6. There is.

These substrate 1 and substrate 5 are a display electrode 2 and an address electrode 7 which are scan electrodes and sustain electrodes.
Are arranged so as to be substantially orthogonal to each other, and are opposed to each other with a minute discharge space interposed therebetween, and the periphery is sealed, and one kind of helium, neon, argon, and xenon or a mixed gas is discharged into the discharge space. It is enclosed as a gas. Further, the discharge space is partitioned into a plurality of partitions by partition walls 8 to provide a plurality of discharge cells at which the intersections of the display electrodes 2 and the address electrodes 7 are located, and each of the discharge cells has red, green, and blue. The phosphor layers 9 are sequentially arranged for each color so that

FIG. 2 shows an electrode array of this plasma display panel. As shown in FIG. 2, the scan electrodes, the sustain electrodes and the address electrodes have a matrix structure of M rows × N columns, and the rows are arranged in the row direction. M rows of scan electrodes SCN1 to SCNM and sustain electrodes SUS1 to
Address electrodes D1 of N columns in which the SUSMs are arranged in the column direction
~ DN are arranged.

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

As a gradation display driving method of the plasma display device, an ADS (address / display period separation) method is generally used. In the ADS method, one field is temporally divided into a plurality of subfields.
For example, when displaying 256 gradations with 8 bits, one field is divided into eight subfields. In addition, each subfield is divided into an address period in which an address discharge for selecting a lighted cell is performed and a sustain period (display discharge period) in which a sustain discharge for display is performed. This A
In the DS system, the first line to the m-th line in each subfield
The entire surface of the PDP is scanned up to the line by the address discharge, and the sustain discharge is performed at the end of the whole surface address discharge.

FIG. 3 shows an example of a timing chart of the display drive circuit of the plasma display device.
As shown in FIG. 3, in the writing period, after all the sustain electrodes SUS1 to SUSM are held at 0 (V), positive voltages are applied to the predetermined address electrodes D1 to DN corresponding to the discharge cells to be displayed in the first row. Write pulse voltage + Vw (V)
When a negative scan pulse voltage −Vs (V) is applied to the scan electrodes SCN1 of the first row, the write discharge is generated at the intersections of the predetermined address electrodes D1 to DN and the scan electrodes SCN1 of the first row. Occur.

Next, a positive write pulse voltage + Vw (V) is applied to the predetermined address electrodes D1 to DN corresponding to the discharge cells to be displayed on the second row, and the scan electrode SCN2 on the second row.
When a negative scan pulse voltage -Vs (V) is applied to each of them, a write discharge occurs at the intersection of the predetermined address electrodes D1 to DN and the scan electrode SCN2 of the second row.

The same operation as described above is sequentially performed, and finally, a positive write pulse voltage + Vw (V) is applied to predetermined address electrodes D1 to DN corresponding to the discharge cells to be displayed in the Mth row.
When a negative scan pulse voltage −Vs (V) is applied to the scan electrode SCNM of the M-th row, write discharge occurs at the intersection of the predetermined address electrodes D1 to DN and the scan electrode SCNM of the M-th row. Happens.

In the next sustain period, all scan electrodes S are
When CN1 to SCNM are once held at 0 (V) and a negative sustain pulse voltage -Vm (V) is applied to all sustain electrodes SUS1 to SUSM, scan electrodes SCN1 to SCNM at the intersections where the write discharge occurs. A sustain discharge occurs between the sustain electrodes SUS1 to SUSM and the sustain electrodes. Next, a negative sustain pulse voltage -Vm (V) is alternately applied to all scan electrodes SCN1 to SCNM and all sustain electrodes SUS1 to SUSM, so that sustain discharge continues in the discharge cells to be displayed. Panel display is performed by the emission of this sustain discharge.

In the next erase period, all the scan electrodes SCN1 to SCNM are once held at 0 (V), and
When the erase pulse voltage -Ve (V) is applied to all the sustain electrodes SUS1 to SUSM, erase discharge occurs and the discharge is stopped.

By the above operation, one screen is displayed on the plasma display device.

FIG. 4 shows the overall structure of a plasma display device according to an embodiment of the present invention, which incorporates the panel having the structure described above.

In the figure, a housing for housing the panel 10 is a frame-shaped front cabinet 11 made of resin for protecting the outer peripheral portion of the panel 10, and a metal back cover for protecting display drive circuit blocks described later. And a front cover 13 made of glass or the like, which also serves as an optical filter and protects the panel 10, is arranged in the opening of the front cabinet 11.

Here, the front cabinet 11 is formed by molding a modified polyphenylene ether resin into a frame shape. Specifically, a modified polyphenylene ether resin using a halogen-free flame retardant with a deflection temperature under load of 85 ° C or higher is formed into a quadrangle shape, and the outer surface of the frame is coated with a paint of a predetermined color. The front cabinet 11 is configured. A specific example of this modified polyphenylene ether resin is "Zylon" (registered trademark) manufactured by Asahi Kasei Corporation.

As shown in FIG. 4, the front cover 13 is provided with, for example, silver vapor deposition in order to suppress unnecessary radiation of electromagnetic waves. Further, the back cover 12 is provided with a plurality of ventilation holes 12a for radiating the heat generated in the panel 10 and the like to the outside.

The panel 10 is held by being bonded to the front surface of a chassis member 14 made of aluminum or the like via a heat conductive sheet 15, and the chassis member 14 is then held.
A plurality of circuit blocks 16 for driving the display of the panel 10 are attached to the rear surface side. The heat conductive sheet 15 is for efficiently transmitting the heat generated in the panel 10 to the chassis member 14 and radiating the heat. The circuit block 16 includes an electric circuit for driving the display of the panel 10 and controlling the display. The electrode block extending to the edge of the panel 10 extends beyond the four edges of the chassis member 14. It is electrically connected by a plurality of extending flexible wiring boards (not shown).

Further, on the rear surface of the chassis member 14, a boss portion 14a for attaching the circuit block 16 and fixing the back cover 12 is provided by projecting integrally by die casting or the like. The chassis member 14
May be constructed by fixing a fixing pin to an aluminum flat plate.

FIG. 5 is a plan view showing an internal arrangement structure of the plasma display device having such a structure with the back cover 12 removed. In FIG. 5, the scan driver circuit block 20 has predetermined scan electrodes on the panel 10. The scan driver supplies a signal voltage, the sustain driver circuit block 21 supplies a predetermined signal voltage to the sustain electrodes of the panel 10, and the address driver circuit block 22 supplies a predetermined signal voltage to the address electrodes of the panel 10. The circuit blocks 20 and the sustain driver circuit blocks 21 are arranged at both ends of the chassis member 14 in the width direction, and the address driver circuit blocks 22 are arranged at the upper end and the lower end of the chassis member 14 in the height direction.

The control circuit block 23 receives an image based on a video signal sent from an input signal circuit block 24 having an input terminal portion to which a connection cable for connecting to an external device such as a television tuner is detachably connected. The data is converted into an image data signal according to the number of pixels of the panel 10 and supplied to the address driver circuit block 22, and a discharge control timing signal is generated and supplied to the scan driver circuit block 20 and the sustain driver circuit block 21, respectively. The display drive control such as gradation control is performed, and the display drive control is arranged at substantially the center of the chassis member 14.

The power supply block 25 supplies a voltage to each of the circuit blocks, and like the control circuit block 23, is arranged at substantially the center of the chassis member 14 and has a power cable (not shown) attached thereto. A commercial power supply voltage is supplied through a power supply input block 27 having a connector 26.

The bracket 28 is mounted on the stand pole, and is mounted at the lower end of the chassis member 14 in the height direction. The tip of the stand pole attached to the stationary stand is inserted into the hole of the bracket 28, and the stand pole is fixed to the bracket 28 with screws or the like to attach the stand, whereby the panel is held upright. It will be.

The flexible wiring board 29 connects the scan electrodes of the panel 10 and the electrode lead-out portions of the sustain electrodes to the printed wiring boards of the scan driver circuit block 20 and the sustain driver circuit block 21, and the flexible wiring board 30 of the panel 10. The electrode lead-out portion of the address electrode and the printed wiring board of the address driver circuit block 22 are connected to each other. The electrode lead-out portion is bent through 180 degrees from the front side to the rear side through the outer peripheral portion of the panel 10 and arranged.

Also, as shown in FIG.
The front cabinet 11 is arranged so as to protect the outer peripheral portions of the flexible wiring boards 29 and 30 that are drawn out to the rear surface side of the panel 10 through the outer peripheral portions of the.

As described above, the plasma display device according to the present embodiment has the front cabinet that protects the outer peripheral portion of the panel and the casing that includes the back cover that protects the display drive circuit block side. Since the cabinet is formed by molding the modified polyphenylene ether resin into a frame shape, it is possible to further reduce the weight of the plasma display device and to provide it at low cost.

That is, in the plasma display device, unlike the display device using a CRT or a liquid crystal display panel, the temperature in the vicinity of the surface of the panel is 60 ° C. to 80 ° C. in view of the operation principle of the plasma display panel.
Since the temperature of the front cabinet and the back cover is high, it is generally performed by molding a metal plate.

Under the circumstances, the present inventor has conducted various studies on the demand for reducing the weight of the plasma display device. As a result, the front cabinet forming the casing is made of modified polyphenylene ether resin. It has been found that, by forming the panel into a shape, the panel is not thermally deformed by the temperature generated by the panel and can be sufficiently molded as a front cabinet that protects the outer peripheral portion of the panel.

Further, according to the plasma display device of the present invention in which such a modified polyphenylene ether resin is molded into a frame shape to form a front cabinet, a panel of 42 inch size is provided as compared with the conventional metal front cabinet. The weight can be reduced by about 0.7 kg, and the cost can be reduced to about 1/4 of that of metal.

Further, in the case of the conventional metal front cabinet, there is a risk that the flexible wiring board or the like on the outer peripheral portion of the panel may be damaged by the burrs generated during the metal forming. The effect is obtained.

In the plasma display device of the present invention in which a modified polyphenylene ether resin is molded into a frame shape to form a front cabinet, the inventors of the present invention have found that the modified polyphenylene ether resin forming the front cabinet is: From the viewpoint of thermal deformation due to the heat of the panel, it is desirable that the deflection temperature under load is 85 ° C or higher.

[0040]

As is apparent from the above description, according to the plasma display device of the present invention, the front cabinet forming the casing is formed by molding the modified polyphenylene ether resin into a frame shape, thereby generating a panel. It can be molded as a front cabinet that protects the outer peripheral part of the panel without causing thermal deformation due to temperature, and it can be made lighter and more economical than conventional metal front cabinets. In addition, it can be constructed at a lower cost than that made of metal.

Further, in the case of the conventional metal front cabinet, there is a possibility that the flexible wiring board or the like on the outer peripheral portion of the panel may be damaged by the burrs generated when the metal is formed. The effect is obtained.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing an electrode array of a panel of the plasma display device.

FIG. 3 is a signal waveform diagram showing an example of a driving method of the plasma display device.

FIG. 4 is an exploded perspective view showing an internal arrangement structure of the plasma display device.

FIG. 5 is a plan view showing an internal arrangement structure of the plasma display device.

[Explanation of symbols]

10 panels 11 Front cabinet 12 back cover 14 Chassis member

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4E360 AB06 AB13 ED07 EE13 GA24                       GA34 GA52 GB02 GC08 GC11                 5C058 AA11 AB00 BA35                 5C094 AA36 AA43 AA44 BA31 DB02                       FB01 FB20 GB01 JA20                 5G435 AA09 AA12 AA17 AA18 BB06                       EE02 EE05 EE36 EE47 GG42                       HH18 KK02

Claims (2)

[Claims] 1. A panel in which a pair of substrates, at least front side of which are transparent, are arranged to face each other so that a discharge space is formed between the substrates and an electrode group is arranged on the substrates, and a chassis member arranged on the back side of the panels. A casing including a display drive circuit block disposed on the chassis member and applying a signal to the panel for displaying, a front cabinet for protecting an outer peripheral portion of the panel and a back cover for protecting the display drive circuit block side. And a body, wherein the front cabinet is formed by molding a modified polyphenylene ether resin into a frame shape. 2. The plasma display device according to claim 1, wherein the front cabinet is formed by molding a modified polyphenylene ether resin containing a halogen-free flame retardant having a deflection temperature under load of 85 ° C. or more into a frame shape.