US 2005/0110386 A1 · Laser cathode ray tube

Abstract

A Laser-CRT is described in which the laser faceplate is at high potential and the cathode is above ground. The cathodes can be modulated in a dual-drive or push-pull mode in which each of the dual video amplifiers is required to swing only half of the total required voltage, thereby writing smaller pixels faster and achieving higher resolution. Another described embodiment provides a substantially constant laser output over time, and an approximately uniform output intensity over an area. A constant-output Laser-CRT can be used to illuminate a spatial light modulator (SLM) in a projection system, and since video modulation is not required in that embodiment, neither are costly electronics and merely a voltage bias need be applied to the electron gun (e.g., the K electrode) to turn on the electron beam.

Claims17

Dependent claims

A Laser-CRT comprising:

a faceplate that includes an active gain layer and opposing reflective surfaces, thereby defining a laser area on said faceplate;
a cathode that emits an electron beam in a direction toward the faceplate to excite laser action at an incident location on the faceplate;
a G1 electrode situated between the cathode and the laser faceplate;
an electrical circuit that maintains the faceplate at a high positive potential with respect to ground;
and
a dual-drive modulation system that modulates the cathode and the G1 electrode responsive to a control signal, said dual-drive system modulating the cathode from an upper modulation voltage to ground, and modulating the G1 electrode from a lower modulation voltage that is below ground to ground.

3 more elements

Dependencies are inferred from the claim text.

Laser cathode ray tube

Life of this patent

Laser cathode ray tube

Life of this patent

Abstract

Claims17