Display panel

Claim 2

A display panel comprising a transparent gas-tight envelope, an ionizable medium in said envelope, two planar main electrodes within said gas-tight envelope lying in different planes and parallel with each other and substantially coextensive with each other, one of said two planar electrodes being a cold cathode and the other of said two planar electrodes being an anode, said anode consisting of a metal screen, said electrodes being for maintaining a cold cathode glow discharge therebetween when a voltage is applied thereacross, and a cathodeluminescent panel positioned on the other side of said anode from said cathode, said cathode-luminescent panel consisting of a transparent glass plate, a transparent electrode means on said transparent glass plate, and a phosphor layer coated on said transparent electrode means, said phosphor layer being on the side of said panel toward said anode.

Claim 3

A display panel as claimed in claim 1, in which said transparent electrode means comprises at least one set consisting of seven segments insulated from each other and arranged in a pattern so as to display a numeral when certain segments are luminescent.

Claim 4

A display panel as claimed in claim 1, in which said transparent electrode means consists of a plurality of parallel strip-electrodes insulated from each other and said metal screen consists of a plurality of parallel anode wires insulated from each other, said strip-electrodes and said anode wires crossing with each other so as to form a cathodeluminescent x-y matrix display system having a plurality of picture elements, each picture element of said cathodeluminescent x-y matrix system consisting of one of said plurality of strip-electrodes and three of said plurality of anode wires, one central anode wire and two end anode wires, and bias means coupled to said anode wires biasing said two end anode wires negatively relative to said central anode wire.

Claim 5

A display panel as claimed in claim 1, in which said transparent electrode means consists of a plurality of parallel strip-electrodes insulated from each other and said metal screen consists of a plurality of parallel metal wires insulated from each other, said strip-electrodes and said anode wires crossing each other so as to form a cathodeluminescent x-y matrix display system, said anode wires and said strip-electrodes constituting the vertical scanning electrodes and the horizontal scanning electrodes of said cathodeluminescent x-y matrix display system, respectively, bias means coupled to said anode wires for biasing said anode wires positively relative to said cathode with a voltage slightly below the sparking voltage between said anodE wires and said cathode, whereby a positive vertical scanning pulse can be superposed by turns on said anode wires, and a positive horizontal scanning pulse which is modulated according to the amplitude or pulse width of a video signal can be applied by turns to said strip-electrodes synchronously to the vertical scanning pulse signal for causing said panel to display an image corresponding to said video signal.

Claim 6

A display panel as claimed in claim 4, in which said plurality of strip-electrodes are in groups of three, and the respective strip-electrodes in each group are coated with three kinds of phosphor layers which emit light of the three primary colors, respectively, so as to display a color video image.