Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Patent
1993-10-01
1996-02-20
Yusko, Donald J.
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
313582, 313586, 313238, H01J 1749, H01J 1716, H01J 926
Patent
active
054931754
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a plasma display panel.
BACKGROUND ART
As a plasma display panel (hereinafter referred to as a PDP), a direct-current type (DC type) PDP and an alternate-current type (AC type) PDP are known. These PDPs are further classified into a so-called mono-color type PDP using the emission of light by a discharge gas and a color type PDP in which a fluorescent substance is caused to emit visible light by ultraviolet rays generated by discharge. Although the following problems arise in both the color and the nono-color type PDPs, they are significant particularly in the color type PDP, so the color PDP will be described mainly below.
Although various methods of arranging PDPs are known, an air-tight vessel containing a discharge gas, which is manufactured by sealing the peripheral portions of front glass and rear plates opposing each other with sealing glass in order to decrease the thickness of the structure, is frequently adopted. Commonly, inexpensive soda-lime glass is used for both the front and rear plates.
In a color PDP having a large number of fine display cells. diaphragms are formed between the front and rear plates in order to prevent an erroneous discharge or a blur of colors between adjacent cells or to keep the difference between pressures inside and outside the panel, or as spacers for defining the distances between discharge electrodes. A space surrounded by the diaphragms and the front and the rear plates functions as one display cell. A fluorescent substance is deposited on the inner surface of each display cell to emit visible light of each individual color upon irradiation with ultraviolet rays generated by discharge. In the formation of the diaphragms, a thick-film formation technique that prints and calcines a dielectric paste consisting of, e.g., glass on the front and rear plates is used. In addition, methods using a porous metal plate have been proposed by the present inventors in Japanese Patent Application Laid-Open gazette Nos. 3-152830, 3-205738 and 4-19942. The present invention relates to a color PDP using this porous metal plate.
In the color PDP having a large number of fine display cells capable of displaying images, a matrix cell arrangement in which cells and electrodes can be formed easily is generally adopted. It is convenient to form a number of cells at the intersections of linear row- and column-discharge electrodes formed in a matrix manner. Each group of the row- and column-electrodes is a first or second electrode group, and a large number of cells can be selected independently of one another in these two electrode groups. Therefore, the types of first and second electrode groups are not particularly limited as long as a number of cells can be selected.
In the DC type PDP, linear cathodes are formed on a front glass plate or a rear plate, and linear anodes are formed on a substrate opposing the cathodes, such that both the cathodes and the anodes are exposed to a discharge gas and cross each other with diaphragms between them. Alternatively, the cathodes and the anodes can be formed on the same substrate to cross each other via a dielectric. An arrangement using an auxiliary discharge electrode in addition to the first and second electrode groups is also known.
The AC type PDP is similar to the DC type PDP except that discharge electrodes are covered with a dielectric, so two linear electrode groups can also be formed in the AC type PDP. Write electrodes can be formed on the same substrate as the discharge electrodes via an insulating layer. In some DC type PDPs, one of a pair of electrode groups is formed to cross the other via an insulating layer, making the use of write electrodes unnecessary. There is another known arrangement in which the electrodes of one of a pair of discharge electrode groups covered with a dielectric are connected together in units of cells, and electrodes for selection, so-called write electrodes are used as exposed electrodes.
A fluorescent substance is formed on a substrate opposing a
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Research Disclosure, No. 305, Sep. 1989, Havant GB, p. 637.
Noritake Co. Ltd.
Patel Nimesh D.
Yusko Donald J.
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