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(11) | EP 0 354 750 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Image display apparatus and method of fabrication thereof |
| (57) An image display apparatus comprising an insulating substrate (1) having electron
sources (13) controlled by X-Y matrix electrodes (10, 11) and a face plate (4) coated
with a phosphor material in opposed relationship with the substrate is disclosed.
An electron source at each intersection of the X-Y matrix control electrondes is made
up of a plurality of cold cathodes (2) connected to an X-control electrode (10) and
a plurality of gate electrodes (3) connected to a Y-control electrode (11) opposed
to the cold cathodes in the same plane, and the electron source is formed on the substrate
surface on other than the X- and Y-control electrodes. A voltage applied between the
cold cathodes and gate electrodes arranged in opposed relations on the same surface
causes a high electric field of about 10⁷ V/cm at the forward end of the cold cathodes
leading to an electron emission. A part of electrons thus emitted enters the anodes
directly. Another part of electrons flow into the opposed gate electrodes to generate
secondary electrons in the surface of the gate electrodes. The secondary electrons
thus generated are accelerated by the positive voltage (anode voltage) applied to
the phosphor surface of the opposed face plate and bombarded on the phosphor material,
which is thus illuminated. |