Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Patent
1995-09-19
1998-03-31
O'Shea, Sandra L.
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
313584, 313586, H01J 1749
Patent
active
057342288
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a plasma display panel for a multi-screen constituted by a plurality of unit plasma display panels assembled together, and more particularly to a plasma display panel for a multi-screen capable of minimizing the generation of a mosaic pattern and a picture distortion on the entire multi-screen by minimizing the size of a connection boundary area formed between adjacent unit plasma display panels connected to each other to constitute the multi-screen.
BACKGROUND ART
To manufacture an image display device with a large screen having a size of several hundred inches, a multi-screen system is generally used, in which a screen is constituted by connecting a plurality of unit display devices together such that adjacent unit displays are in contact with each other at their facing edges. This is because it is difficult to fabricate a large screen using a single display device in terms of technology and economy.
Where a large screen is fabricated using plasma display panels, it is suitable to use the multi-screen system because of the above-mentioned reason. Plasma display panels have a superior non-linearity over other planar displays. Where these plasma display panels are used to constitute a multi-screen, accordingly, they can exhibit a continuity between adjacent unit screens, thereby providing a screen with good quality as compared to other display devices.
Even in the multi-screen constituted by the plasma display panels, however, it is difficult to avoid a connection boundary area formed between adjacent unit plasma display panels each constituting a partial screen. As a result, a mosaic pattern is formed on the entire screen. The reason why the connection boundary area is formed is because each unit plasma display panel has a non-display area at its sealing portion for bonding upper and lower plates of the unit plasma display panel due to a certain thickness of the sealing portion. Since the thickness of the sealing portion is increased twice when adjacent unit plasma display panels are connected to each other, a connection boundary area disabling a display on the screen is formed at the connection region between adjacent unit plasma display panels.
In spite of the non-linearity characteristic of plasma display panels, the mosaic pattern causes a picture distortion phenomenon to occur upon connecting pictures. As a result, the entire picture becomes unnatural, thereby resulting in a degradation in picture quality. In particular, where an oblique line is displayed such that it extends over adjacent outermost display cells of adjacent unit plasma display panels, its display becomes inaccurate because a picture distortion occurs due to the thickness of the connection boundary area, in spite of the superior non-linearity characteristic of the plasma display panels.
It is apparent that such a mosaic pattern generated due to the connection boundary area serves to degrade the quality of the entire screen. It is therefore desirable to prevent the generation of such a mosaic pattern as much as possible. In order to minimize the picture distortion occurring due to the connection boundary area, it is required to reduce the width of the connection boundary area. For this, there has been proposed a method for bonding upper and lower plates of each unit plasma display panel at their edges using a bonding glass plate. However, this method is difficult to efficiently accomplish the purpose for eliminating or reducing the connection boundary area. This is because the bonding glass plate should have a certain thickness to provide reliability and workability.
Another method has also been proposed which involves attaching a bonding member along side edges of the upper and lower plates and then pressing the bonding member to reduce the thickness of the bonding member. In this method, however, the bonding member should also have a certain thickness on the outside of the upper and lower plates. In other words, it is difficult to efficiently reduce the connection boundary area by
REFERENCES:
patent: 5182489 (1993-01-01), Sano
Ku Bon Hee
Kwon Yang Ho
O'Shea Sandra L.
Orion Electric Co. Ltd.
Patel Vip
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