[Background Art] Figs. la and lb are cross-sectional diagrams illustrating a conventional plasma display panel and a conventional multi-display panel.

Referring to Fig. la, the conventional plasma display panel comprises a front panel 10-1, a rear panel 10-2, a barrier rib 20, an electrode (not shown) and a seal 30 for sealing the front panel 10-1 and the rear panel 10-2.

In the conventional plasma display panel, the seal 30 is formed inside of end portions of the front panel 10-1 and the rear panel 10-2, and barrier ribs 20 are formed between the seals 30. As a result, a distance becomes longer between the end portions of the front panel 10-1 and the rear panel 10-2 and a display region inside the barrier rib 20. Additionally, it is difficult to combine a plurality of panels because the thickness of the seal is not uniform.

When a multi-display panel is formed by combining a plurality of conventional plasma display panels for fabrication of large screen, there are problems as follows.

The multi-display panel of Fig. lb is formed by combining a plurality of plasma display panels of Fig. la. As shown in Fig. I b, if the plasma display panels of Fig. la are combined, a seam is generated in the center of the multi-display panel due to a

distance d between display regions of one plasma display panel and the other. When 4 plasma display panels are combined with 2 x 2, a seam crossed horizontally and vertically is generated in the center of the multi-display panel. As a result, since the whole screen is divided by the seam, the whole screen is discontinuously displayed.

[Detailed Description of the Invention) Accordingly, it is an object of the present invention to provide a plasma display panel wherein seal of the plasma display panel is formed with an oblique line to have the uniform thickness of the plasma display panel for easy combination of a plurality of plasma panels, and to provide a seamless multi-display panel wherein there is no seam between the combined plasma display panels.

In an embodiment, a plasma display panel comprises a first substrate, a second substrate and a sealing unit. Here, an end portion of the first substrate is extended longer than that of the second substrate by a predetermined length, and the sealing unit seals the end portion of the first substrate and the end portion of the second substrate with an oblique line.

In an embodiment, a multi-display panel comprises a plurality of plasma display panels each comprising a first substrate, a second substrate and a sealing unit. Here, side portions of the plasma display panels are combined adjacently, wherein an end portion of the first substrate is extended longer than that of the second substrate by a predetermined length, and the sealing unit seals the end portion of the first substrate and the end portion of the second substrate with an oblique line. The multi-display panel further comprises a fill-in unit for filling in a space between sealing units of the adjacent plasma display panels.

In an embodiment, a multi-display panel comprises a plurality of plasma display panels each comprising a front panel, a rear panel and a sealing unit, wherein side portions of the plasma display panels are combined adjacently. Here, of the two

adjacent plasma display panels, an end portion of the front panel is extended longer than that of the rear panel by a predetermined length, an end portion of the rear panel is extended longer than that of the front panel, and the sealing unit seals the end portion of the front panel and the end portion of the rear portion with an oblique line.

Description of the Drawings] Figs. la and lb are cross-sectional diagrams illustrating a conventional plasma display panel and a conventional multi-display panel.

Figs. 2a and 2b are cross-sectional diagrams illustrating a plasma display panel according to a first embodiment and a second embodiment of the present invention.

Figs. 3a and 3b are cross-sectional diagrams illustrating a multi-display panel according to a first embodiment and a second embodiment of the present invention.

Fig. 4 is a cross-sectional diagram illustrating a multi-display panel according to a third embodiment of the present invention.

[Preferred Embodiments] Fig. 2a is a cross-sectional diagram illustrating a plasma display panel according to a first embodiment of the present invention.

Referring to Fig. 2a, the plasma display panel comprises a first substrate 100-1, a second substrate 100-2, a barrier rib 200 and a sealing unit 300. Since an electrode formed in a display region of the plasma display panel is the same as a conventional electrode, the explanation is omitted.

Here, an end portion of the first substrate 100-1 is extended longer than that of the second substrate 100-2 by a predetermined length. The sealing unit 300 for sealing the first substrate 100-1 and the second substrate 100-2 seals the end portion of the first

substrate 100-1 and the end portion of the second substrate 100-2 with an oblique line.

It is preferable that the sealing unit 300 is formed to be adjacent to an exterior angle barrier rib 200-1 of a display region located inside the end portion of the second substrate 100-2. It is preferable that the first substrate 100-1 and the second substrate 100-2 are a front panel and a rear panel of the plasma display panel, respectively.

Fig. 2b is a cross-sectional diagram illustrating a plasma display panel according to a second embodiment of the present invention.

Referring to Fig. 2b, the plasma display panel of Fig. 2b comprises a first substrate 110-1, a second substrate 110-2, a barrier rib 210 and a sealing unit 310. Since an electrode formed in a display region of the plasma display panel is the same as a conventional one, the explanation of the electrode is omitted.

An end portion of the second substrate 110-2 is extended longer than that of the first substrate 110-1 by a predetermined length. The sealing unit 310 for sealing the first substrate 110-1 and the second substrate 100-2 seals the end portion of the first substrate 110-1 and the end portion of the second substrate 110-2 with an oblique line.

It is preferable that the sealing unit 310 is formed to be adjacent to an exterior angle barrier rib 210-1 of a display region located inside of the end portion of the first substrate 110-1. That is, when the plasma display panel of Fig. 2b is compared with that of Fig. 2a, they are actually the same except the difference in the length of the first substrate and the second substrate.

It is preferable that the first substrate 100-1 and the second substrate 100-2 are a front panel and a rear panel of the plasma display panel, respectively.

Figs. 3a and 3b are cross-sectional diagrams illustrating a multi-display panel according to a first embodiment and a second embodiment of the present invention. Fig.

3a shows when two or more plasma display panels shown in Fig. 2a are combined. Side

portions of the plasma display panels are located to be adjacent each other, and a fill-in unit 400 is formed to fill in a space between sealing units of the adjacent plasma display panels. It is preferable that the fill-in unit 400 is formed with a buffering material such as silicon.

Fig. 3b shows when two or more plasma display panels shown in Fig. 2b are combined. Side portions of the plasma display panels are located to be adjacent each other, and a fill-in unit 410 is formed to fill in a space between sealing units of the adjacent plasma display panels.

Here, the fill-in unit 410 is preferably formed with a buffering material such as silicon or with a lens and a filter so that a seam region may be shown narrow. When the fill-in unit 410 is formed with a lens or a filter, the lens or the filter serves as a function of focusing a light generated from a display region of the adjacent plasma display panel toward a junction surface. As a result, the seam region is shown narrow.

Fig. 4 is a cross-sectional diagram illustrating a multi-display panel according to a third embodiment of the present invention.

Referring to Fig. 4, the multi-display panel of Fig. 4 is formed by combining two or more plasma display panels of Figs. 2a and 2b.

The plasma display panels of Figs. 2a and 2b comprises sealing units 300 and 310 formed with an oblique line. As shown in Fig. 4, a multi-display panel may be formed by combining the plasma display panels of Figs. 2a and 2b in order to minimize the seam. Each of the plurality of plasma display panels comprises the front panels 100- 1 and 110-1, the rear panels 100-2 and 110-2 and the sealing units 300 and 310. When a multi-display panel is formed by combining side portions of the plasma display panels, of the two adjacent plasma display panels, the end portion of the front panel 100-1 is extended longer than that of the rear panel 100-2 by a predetermined length, the end

portion of the rear panel 110-2 is extended longer than that of the front panel 110-1, and the sealing units 300 and 310 seal the end portion of the front panels 100-1 and 110-1 and the end portion of the rear portions 100-2 and 110-2 with an oblique line. Here, a fill-in unit 420 is formed to fill in a space between the two adjacent panels. The fill-in unit 420 is preferably formed with a buffering material such as silicon.

[Industrial Applicability] As discussed earlier, in a plasma display panel and a multi-display panel according to an embodiment of the present invention, a sealing unit is formed with an oblique line so that the thickness of the sealing unit in the plasma display panel may be uniform for easy combination of a plurality of plasma panels. Specifically, the seam may be minimized in the multi-display panel formed by combining plasma display panels, and impact resulting from friction may be minimized by a function of a buffering material such as a lens or a filter in a space between the adjacent plasma display panels. As a result, a seam region can be shown narrow since a light of a junction portion is focused.