Patent ID: 7064479

Claim:
A cold cathode display device comprising: a first and second substrates disposed opposite each other with a space therebetween which is evacuated, at least a display portion of said second substrate, serving as a display surface, being transparent; a light emitting part disposed at a predetermined position on a side of said second substrate on which the space is located, said light emitting part including a positive electrode and phosphors on said positive electrode; an electron emitting part disposed on a side of said first substrate on which the space is located, opposite said light emitting part, said electron emitting part emitting an electron upon application of a predetermined potential; an extraction electrode located between said electron emitting part and said light emitting part, for controlling the electron emitted from said electron emitting part, wherein width of said electron emitting part is equal to a length obtained by subtracting twice the distance between said extraction electrode and said electron emitting part from a longer diameter of a passage window in said extraction electrode; and a focus electrode located between said light emitting part and said extraction electrode, said focus electrode including windows through which the electron emitted from said electron emitting part passes.