Patent ID: 7796331
Filing Date: 2010-09-14
Classification: G03B

Abstract:
1. A laser image display screen for projecting laser light having a center wavelength λ and a half value width Δλ, said laser image display screen comprising: a reflection scattering body that scatters and reflects the laser light, said reflection scattering body having a concave-convex shape; and a semi-transmissive diffusion layer that is arranged substantially parallel to the reflection scattering body, wherein: the semi-transmissive diffusion layer reflects at least 20% or more of the laser light, and transmits the remaining laser light, and diffuses and outputs the transmitting laser light; and a relationship of a distance d between a boundary on a side opposite to the reflection scattering body of the semi-transmissive diffusion layer and the reflection scattering body, the center wavelength λ, and the half value width Δλ satisfies 2d×Δλ>λ