초록 ▼

An image display device includes at least one display cell having the following in spaced relation: a photocathode; multiplier dynodes, an anode electrode; and a cathodoluminescent screen. In addition to an optical feedback fluorescent material, the anode electrode includes a material which exhibits

An image display device includes at least one display cell having the following in spaced relation: a photocathode; multiplier dynodes, an anode electrode; and a cathodoluminescent screen. In addition to an optical feedback fluorescent material, the anode electrode includes a material which exhibits slow fluorescence, e.g., Y2O3:Gd3%, such that it emits light energy for a finite time period after it has been excited by electrons. In the operation of the display device, an electrical discharge is employed to produce the desired optical output at the cathodoluminescent screen. Some of the electrons created in the discharge strike the anode electrode, causing light energy to be directed to the photocathode where it is converted into free electrons. The presence of these free electrons ensures the rapid initiation of subsequent electrical discharges. In other embodiments, the electrical discharge may be obtained through ion feedback or plasma discharge.

대표청구항 ▼

An image display device comprising an evacuated envelope within which is disposed a plurality of cathodoluminescent cells in a matrix array, each cell including: a. a source of electrons comprising: 1. a cathode electrode having means for emitting electrons in response to impinging electromagnetic r

An image display device comprising an evacuated envelope within which is disposed a plurality of cathodoluminescent cells in a matrix array, each cell including: a. a source of electrons comprising: 1. a cathode electrode having means for emitting electrons in response to impinging electromagnetic radiation; 2. means, including said cathode electrode, for establishing an electrical discharge, said discharge means further comprising: i. an anode electrode having means for producing electromagnetic radiation in response to bombardment by electrons; ii. an open channel between said anode electrode and said cathode electrode whereby a fraction of the electromagnetic radiation produced by said anode electrode is clear to feed back to and impinge upon said cathode electrode; and iii. means for sustaining a flow of electrons from said cathode electrode to said anode electrode; b. electron beam formation means; c. means for modulating a flow of electrons from said electron beam formation means; d. means for accelerating the modulated flow of electrons; e. a cathodoluminescent screen excitable by the accelerated and modulated flow of electrons, said screen being separated from said anode electrode; and f. additional means for storing a portion of the energy of said electrical discharge and then spontaneously emitting said stored energy to establish a subsequent electrical discharge.