Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Reexamination Certificate
1998-10-05
2001-07-03
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C313S479000, C313S473000
Reexamination Certificate
active
06255778
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a gas discharge type display panel utilizing a plasma display panel (hereinafter, referred to as “PDP”) and, more particularly, to a display panel utilizing a PDP which is integrated with electromagnetic-wave shielding material to impart electromagnetic-wave shielding efficiency to the display panel itself, thereby lightening its weight, making its wall thinner, reducing the number of parts, and thus improving the productivity and reducing the cost.
DESCRIPTION OF THE RELATED PART
A PDP (plasma display panel) utilizing a discharging phenomenon has the following advantages in comparison to a liquid crystal display (LCD) and a cathode ray tube (CRT). Therefore, recently it has been researched and developed for practical use, for example, televisions, office automatic apparatus such as personal computers and word processors, traffic apparatus, boards, and other kinds of display panels.
1. It utilizes discharge light so that it is spontaneous light.
2. As its discharge gap is 0.1-0.3 mm, it can be shaped in panel.
3. By using fluorescent substances, it can emit colors.
4. It eases to make wide screen.
The basic display mechanism of the PDP is displaying of letters and figures by selective discharge emitting of fluorescent substances in many discharge cells which are disposed distantly each other between two plate glasses, and for example, has a mechanism as shown in FIG.
9
.
In
FIG. 9
, a numeral
121
designates a front glass,
122
designates a rear glass,
123
designates a bulkhead,
124
designates a display cell (discharge cell),
125
designates an auxiliary cell,
126
designates a cathode,
127
designates a display anode,
128
designates an auxiliary anode. A red fluorescent substance, a green fluorescent substance, or a blue fluorescent substance (not shown) is provided in a film form on internal walls of each display cell
124
and these fluorescent substances emit light by electrical discharges when a voltage is applied between electrodes.
From the front surface of the PDP, electromagnetic waves with frequency from several kHz to several GHz are generated due to applying voltage, electrical discharge, and light emission, and the electromagnetic waves have to be shielded. Moreover, for improving its display contrast, reflection of external light at the front surface has to be prevented.
In order to shield such electromagnetic waves from PDP, a transparent plate which has electromagnetic-wave shielding efficiency is disposed in front of the PDP.
The PDP in which the separate transparent plate is disposed in front of the PDP has defects as follows:
1. Structure for disposing two panels is complicated.
2. As a transparent base plate made of glass or the like is required for each of the PDP and the electromagnetic-wave shielding transparent plate, the PDP and the electromagnetic-wave shielding transparent plate make thicker and heavier in total.
3. The number of parts and man-hours are increased, thereby raising the cost.
OBJECT AND SUMMARY OF THE INVENTION
It is an object of the present invention to solve the conventional problems as mentioned above and to provide a display panel utilizing a PDP which is integrated with electromagnetic-wave shielding material to impart electromagnetic-wave shielding efficiency to the display panel itself, thereby lightening its weight, making its wall thinner, reducing the number of parts, and thus improving the productivity and reducing the cost.
It is also an object of the present invention to provide a display panel which has good light transparency and high electromagnetic-wave shielding efficiency and thus can provide distinct pictures by preventing moiré phenomenon when a conductive mesh is used as electromagnetic-wave shield.
It is another object of the present invention to provide a display panel which has high safety by preventing scattering of fragments when damaged.
It is yet another object of the present invention to provide a display panel which has good light transparency and high electromagnetic-wave shielding efficiency and thus can provide distinct pictures without problems of moiré phenomenon.
It is further another object of the present invention to provide a display panel which has both electromagnetic-wave shielding efficiency and heat ray blocking efficiency.
It is still further another object of the present invention to provide a display panel which can easily provide conduction between an electromagnetic-wave shielding material and a body of equipment and can be easily built in the body of equipment.
A display panel of the first aspect comprises a plasma display panel body and an electromagnetic-wave shielding material which is bonded to a front surface of the plasma display panel body by transparent adhesives.
The display panel of the first aspect can be manufactured lighter, thinner, and with reduced number of parts because the PDP and the electromagnetic-wave shielding material are integrated by the transparent adhesives and thus can improve of the productivity and the reduction of the cost.
In the first aspect, it is preferable that the electromagnetic-wave shielding material is a conductive mesh member. In addition, it is preferable that a transparent base plate is bonded to a front surface of the electromagnetic-wave shielding material by transparent adhesives.
The first aspect also provides a display panel comprising a plasma display panel body, an electromagnetic-wave shielding material which is bonded to a front surface of the plasma display panel body by transparent adhesives, and a transparent base plate which is bonded to a front surface of the electromagnetic-wave shielding material by transparent adhesives, wherein the electromagnetic-wave shielding material is a conductive mesh member and wherein the transparent adhesives are transparent elastic adhesives. In the display panel, because the PDP body, the conductive mesh member and the transparent base plate are integrated by transparent elastic adhesives, the scattering of fragments when the display panel is broken due to some impact can be prevented, thereby improving its safety.
In the first aspect, the conductive mesh may be a composite mesh member in which metallic fibers and/or metal-coated organic fibers and organic fibers are woven. Since the composite mesh member can be woven without fraying even when it is made of fine fibers to have a large open area ratio, by using, as the electromagnetic-wave shielding material, the conductive composite mesh member in which metallic fibers and/or metal-coated organic fibers and organic fibers are woven, the degree of freedom for line width and the open area ratio is improved. Therefore, it can easily provide a conductive mesh member having excellent electromagnetic-wave shielding efficiency and light transparency without moire phenomenon.
Further in the first aspect, a heat-ray blocking layer may be interposed between the transparent base plate and the plasma display panel body. By integrating the heat-ray blocking layer as well as the electromagnetic shielding material, the display panel can provide not only the electromagnetic-wave shielding efficiency but also heat-ray (near infrared ray) blocking efficiency.
A display panel of the second aspect comprises a plasma display panel body, an electromagnetic-wave shielding material which is bonded to a front surface of the plasma display panel body by transparent adhesives, and a transparent base plate which is bonded to a front surface of the electromagnetic-wave shielding material by transparent adhesives, wherein the electromagnetic-wave shielding material is a conductive foil which is formed by pattern etching.
The display panel of the second aspect can be manufactured lighter, thinner, and with reduced number of parts because the PDP and the electromagnetic-wave shielding material are integrated by the transparent adhesives and thus can improve the productivity and the reduction of the cost.
Since the conductive foil can be formed in any desirable pattern by pattern etching, the degree of freedom
Morimura Yasuhiro
Yoshikawa Masato
Bridgestone Corporation
Guharay Karabi
Kanesaka & Takeuchi
Patel Nimeshkumar D.
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