Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Patent
1991-06-14
1993-11-23
Tusko, Donald J.
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
313491, 313518, 313519, 313585, 313586, H01J 1749
Patent
active
052647587
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a plasma display panel which uses a metal plate with apertures as a diaphragm or a spacer and to the method of producing the same.
BACKGROUND ART
In the modern plasma display panels (hereinafter referred to as PDPS), those of the type in which two pieces of substrates are laminated one upon the other maintaining a suitable gap, the periphery thereof is sealed with glass to constitute a housing and the gap is filled with a gas so that the panel is flat. Of the two pieces of substrates, the front plate must be composed of a glass plate and the other back plate is also composed of a glass plate of the same kind since it is inexpensive. Therefore, the following description deals with the PDP of this type.
In producing the PDPS, the air is exhausted prior to filling with a gas causing the pressure differential to become the greatest between the inside and the outside of the housing. Due to this pressure differential, the two pieces of glass substrates undergo a deformation. The deformation further increases due to the heating that is effected to release the gas that is adsorbed in the housing. In order to suppress the deformation to a negligible degree, the thickness of the glass plates must be increased or the size of the panel must be decreased. Such a limitation can be removed if spacers are provided between the two pieces of glass plates; i.e., spacers are indispensable for large display panels.
In the PDPs in which a plurality of discharge cells are arranged, furthermore, diaphragms or spacers are usually necessary to maintain a suitable gap for electric discharge or to prevent crosstalk relative to the neighboring cells irrespective of the type of electric discharge such as the AC type or the DC type.
Here, the arrangement of discharge cells in the PDP is determined depending upon the object of its use, and examples include a figure-eight display consisting of seven segments, a character display consisting of 5.times.7 dots, a full-dot display consisting of 640.times.480 dots, and the like.
FIGS. 1 to 5 illustrate arrangements of discharge cells in the PDPs, and wherein reference numeral 1 denotes a front glass plate, 3 denotes a diaphragm, 5 denotes a back glass plate, 6 denotes positive electrodes, and reference numeral 7 denotes negative electrodes. As shown in these drawings, there are used diaphragms and spacers (hereinafter often referred to simply as diaphragms) having a variety of shapes and cell holes of a variety of arrangements. The diaphragm can be prepared by the same method for any arrangement of cells, and a variety of methods have heretofore been attempted such as:
Among them, the method A is excellent in regard to economy and mass-produceability but has a defect in that a gap large enough for electric discharge is not obtained unless the printing is repeated many times. In the full-dot display PDP, in particular, making the dot pitch very fine (e.g., 0.2 mm of dot pitch) is very important but cannot be accomplished by the screen-printing method. A fine dot pitch was accomplished in the shape of stripes as shown in FIG. 2 (Y. Amano: SID Int. Symp. Dig. Tech. Paper, p. 160, 1982), which, however, cannot be applied to diaphragms that completely surround the discharge cells as shown in FIGS. 1 and 4, and is not practical since it requires a very high degree of technology.
There is a great difference in sense between the case where the discharge cells are completely surrounded by the diaphragm (hereinafter referred to as the completely closed diaphragm) as described above and the case where the diaphragm does not exist relative to the neighboring cells even in one direction (hereinafter referred to as incompletely closed diaphragm) like that of the shape of stripes.
For instance, when a luminous color of a rare gas itself is to be utilized such as a PDP of an orange luminous color by the electric discharge of a neon gas, even the incompletely closed diaphragm can be put into practical use since the emission of light is limited to the proximi
REFERENCES:
patent: 3798482 (1974-03-01), Reboul
patent: 3842308 (1974-10-01), Van Esdonk et al.
patent: 4037130 (1977-07-01), Mimitsuka et al.
patent: 4352040 (1982-09-01), Andreadakis
patent: 4388550 (1983-06-01), de Vries
Asai Hideyuki
Iijima Motoki
Kamiya Magonori
Kani Akira
Kikuchi Naoya
Noritake Co., Limited
Patel Ashok
Tusko Donald J.
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