Large-sized color display device

Claim 1

A display device comprising: a plurality of display units positioned adjacent each other, said display units each comprising, a display plate, a plurality of luminous cells held on said display plate, said luminous cells each including illuminants different in luminous color, a unit casing in which cathodes and control electrodes arranged opposite to said luminous cells are disposed, and a reflector mounted on said display plate, said reflector having a plurality of reflecting sides defining openings, each opening being positioned to correspond to a respective of said luminous cells and gradually expanding in a direction forward from said luminous cells; wherein said reflector has a front surface opposite said casing, said front surfaces having a width which is wider than the respective unit casing; said unit casings of adjacent display units separated by a gap which has a width sufficiently wide to enable lead wires to said electrode to pass through said gaps; the reflectors of adjacent display units having contiguous front surfaces; and the width of the front surface of each said reflector equaling the sum of the width of the unit casing and the width of said gaps; wherein the front end surface of said reflecting opening has a longitudinal central margin defining a width (S), a longitudinal outer margin defining a width (T), a lateral central margin defining a width (S'), and a lateral outer margin defining a width (T'), which have the following dimensional relationship: S≈2T≈S'≈2T'.