Patent ID: 7898162

Claim:
A laser projection system comprising: a laser-CRT that emits red, green, and blue laser beams, wherein the laser-CRT comprises: a vacuum tube envelope; an electron gun situated at one end of the vacuum tube envelope, said electron gun arranged to emit an e-beam along an e-beam axis; a plurality of laser faceplates including a red laser faceplate, a green laser faceplate, and a blue laser faceplate arranged approximately at a non-perpendicular orientation angle to the e-beam axis to receive the e-beam, each faceplate comprising: a partially reflective mirror arranged to receive said e-beam, a highly reflective minor arranged parallel to said partially reflective minor to define an optical cavity, and a laser gain layer comprising a semiconductor material situated within said optical cavity; and a substantially opaque heat-removing structure connected to said laser faceplates; a projection system optically coupled to receive the laser beams, combine the light, and project the combined beam onto a screen to form an image; and an electron beam current control system connected to the electron gun of said laser-CRT to individually control the electron beam current in each faceplate, thereby providing a system to balance color in the projected image.