Patent ID: 9651204
Date: 2017-05-16
CPC Classifications: F21K,F21V,G02B,G02F

Claim:
1. A backlight, comprising a monochromatic laser diode, a reflector and a beam-expanding prism, wherein the monochromatic laser diode and the beam-expanding prism are arranged on the reflector, and monochromatic laser beams from the monochromatic laser diode are expanded after being reflected by the beam-expanding prism, wherein the beam-expanding prism is a total internal reflection beam-expanding prism; and wherein the total internal reflection beam-expanding prism includes a beam-expanding surface, a refractive surface and a totally reflective surface, the refractive surface is a light incident surface and forms a first angle relative to the reflector, the totally reflective surface is a surface of the total internal reflection beam-expanding prism opposite to the refractive surface and forms a second angle relative to the reflector, and the beam-expanding surface is a light-emitting surface and is a curved surface.