초록 ▼

A cathodoluminescent image display device utilizes a cold cathode as the source of electrons. The cold cathode comprises a photocathode, an electron multiplier and a fluorescent anode. The structure of the cathode is such that a portion of the light given off by the fluorescent anode is free to feed

A cathodoluminescent image display device utilizes a cold cathode as the source of electrons. The cold cathode comprises a photocathode, an electron multiplier and a fluorescent anode. The structure of the cathode is such that a portion of the light given off by the fluorescent anode is free to feedback and impinge upon the photocathode. The cold cathode disclosed herein is thus a closed loop device having a loop gain G. The electron multiplier has a gain Gm such that the loop gain G of the device is maintained at a value greater than or equal to one thus causing a sustained electron 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. An anode electrode having means for producing electromagnetic radiation in response to bombardment

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. An anode electrode having means for producing electromagnetic radiation in response to bombardment by electrons; 2. a cathode electrode having means for emitting electrons in response to impinging electromagnetic radiation; 3. an open channel between said anode electrode and said cathode electrode whereby a fraction Fc of the electromagnetic radiation produced by said anode electrode is clear to feed back to and impinge upon said cathode electrode; and 4. 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; and e. a cathodoluminescent screen excitable by the accelerated and modulated flow of electrons, said screen being separate from said anode electrode.