TECHNICAL FIELD

The present invention relates to a structure of a plasma display panel and aore particularly, to a structure of a plasma display panel for aulti-screen system in which the display cells adjacent to the sealing seam of the panel are wade of a size increasing in direction perpendicular to the sealing seaa with respect to the rest of the display cells thereby reducing a distortion of information displayed on the screen.

BACKGROUND ART

The aost siailar prior art in technical essence to this invention is the plasaa display panel disclosured in USSR Patent No. 1074301 ( March 30, 1982 ). This plasaa display panel coaprises upper and lower plates and systeas of autually orthogonal electrodes, in which display cells adjacent to the sealing seaa are foraed by hollows of grooves, and an external sealing eleaent is separated froa internal cell voluae by a light-translucent eleaent with a round cross-section inserted into the hollow and located around the edges.

However, the drawbacks of the USSR patent is in loss of a pitch at the place of joint of panels because of large thickness of the sealing seaa and it results in information distortion displayed on the screen.

DISCLOSURE OF THE INVENTION Accordingly, in consideration of the drawbacks of said described patent, the main object of the present invention is to provide improvement of information quality displayed in the at the expense of elimination of information distortion at the place of panel sealing parts.

To accomplish the object, the present invention comprises upper and lower dielectric plates, cathode and anode electrodes orthogonally located between said plates, display

cells defined by said electrodes, barrier ribs for seperating and defining display cells from each other and sealing seaa for sealing edge parts of said two plates, in which the display cells adjacent to the sealing seaa are aade of a size increasing in direction perpendicular to the sealing seaa with respect to the rest of the display cells.

BRIEF DESCRIPTION OF DRAWINGS Fig. 1 is a scheaatic view depicting the plasaa display panel for PDP aulti-screen systea.

DETAILED DESCRIPTION OF THE INVENTION

In Fig. 1, PDP (10) coaprises the upper dielectric plate(l) and the lower dielectric plate (2). Cathode electrode(3) and anode electrode(4) are orthogonally located between said plates (1) and (2). These electrodes (3) and (4) fora display cell (5) and (6), the cell (5) being foraed between barrier ribs (8) and thew cell (6) being adjacent to one side of sealing seaa (7). The display cells (5) and (6) are separated by barrier ribs (8).

As depicted, the horizental length of display cell (6) adjacent to sealing seaa (7) is aore long than the horizental length of display cell (5) being foraed between barrier ribs (8) and that the following ratio should be observed :

0.5 ( hs - he ) + lm ≤ le ≤ ( hs - he ) + lm

le : size of cell (6) adjacent to the sealing seam (7); lm : size of cell (5) hs : width of sealing seam (7); he : width of barrier rib (8) between cells (5):

For example, if size of cell(5) is 1.2 x 2 mm, width of sealing seam (7) is 1.5 mm and width of barrier ribs (8) between cells (5) is 1.5 mm, size of cell (6) adjacent to the sealing seam (7) becomes 2.7mm.

Increasing of size of cell (6) adjacent to the sealing seam (7) within the limits of given ratio results in keeping of specific light flux constant in the centre of panels and the place of their joints and it assists to create more favourable conditions for an operator to read the screen information.

When making size of cells (6) adjacent to the sealing seam (7) le ≥ ( hs - he ) + lm, an intensified light occurs in the region of the sealing seam being provoked by light flux increase of more than 30 % and resulting in information perception with distortion.

When making size of cells (6) adjacent to the sealing seam (7) le ≤ ( hs - he ) + lm, a loss of information takes place as a result of light flux reduction coming from cell adjacent to the sealing by more than 30*.

±30* is permissable limit of screen non-uniform light for DC-type plasma display panels required for normal perception of information on the screen.

As above mentioned, this invention allows to eliminate video-information distortion in multi-screen system in places of panel joints and it results in quality improvement of information displayed.