Large-scale display device

1. A large-scale display device comprising:

a plurality of display units which each include a plurality of elongated plasma tubes arranged in parallel, each of the plasma tubes being filled with a discharge gas, and a plurality of pairs of display electrodes disposed outside the plasma tubes; and

a flexible sheet member; wherein

the adjoined display units overlap each other to respectively have overlap portions and the flexible sheet member provided between the overlap portions to prevent direct contact between ends of the plasma tubes of the adjoined display units; and

the display units are adjoined in a longitudinal direction of the elongated plasma tubes and respectively have adjoining portions which are offset thicknesswise from each other for prevention of contact between ends of the plasma tubes of the adjoined display units.

2. A large-scale display device as set forth in claim 1 , wherein the sheet member is pervious to light.

3. A large-scale display device as set forth in claim 1 , wherein the adjoined display units are continuous through the overlap portions thereof to define a single display screen.

4. A large-scale display device as set forth in claim 1 , wherein a non-display region is defined by the overlap portions of the adjoined display units.

5. A large-scale display device comprising a plurality of display units each of which includes a plurality of plasma tubes aligned in parallel, each plasma tube having a first sealed end which has a first non-display region of length D and a second sealed end which has a second non-display region of length Da longer than the length D, the plurality of the display units being connected to each other in a longitudinal direction of the plasma tubes,

wherein each first sealed end of the plasma tubes constituting one of the display units overlaps with each non-display regions of the second sealed ends of the plasma tubes constituting another of the display units.

6. A large-scale display device comprising:

a plurality of display units which each include a plurality of elongated plasma tubes arranged in parallel, each of the plasma tubes being filled with a discharge gas, and a plurality of pairs of display electrodes disposed outside the plasma tubes;

wherein the display units are adjoined in a longitudinal direction of the elongated plasma tubes and respectively have adjoining portions which are offset thicknesswise from each other for prevention of contact between ends of the plasma tubes of the adjoined display units;

wherein each plasma tube includes a first end which has a first non-display region, a second end which has a second non-display region, and a third non-display region between adjacent two pair of display electrodes,

wherein a length D 1 of the first non-display region, a length D 2 of the second non-display region, and a length D 3 of the third non-display region being defined as follows;

D1≦D3<D2,

wherein the adjoined display units overlap each other to respectively have overlap portions and the first ends of the plasma tubes of a display unit overlap the second ends of the plasma tubes of another adjacent display unit.

7. A large-scale display device comprising:

a plurality of display modules each of which include a plurality of plasma tubes extending in a column direction and arranged in a row direction parallel to each other, a plurality of pairs of display electrodes extending parallel to each other perpendicularly to the plasma tubes, and a plurality of address electrodes extending parallel to each other along the plasma tubes;

wherein the display modules are arranged in a matrix and are supported by a support member so that the display modules aligned in the row direction of the matrix adjoin each other with no step therebetween and the display modules aligned in the column direction of the matrix adjoin each other with a step therebetween;

wherein each plasma tube includes a first end which has a first non-display region, a second end which has a second non-display region, and a third non-display region between adjacent two pair of display electrodes,

wherein a length D 1 of the first non-display region, a length D 2 of the second non-display region, and a length D 3 of the third non-display region being defined as follows;

D1≦D3<D2,

wherein the first ends of the plasma tubes of a display module overlap the second ends of the plasma tubes of another adjacent display module in the column direction.