| 摘要 |
A projection screen comprises a cholesteric liquid crystalline, polarized-light selective reflection layer for selectively diffuse-reflecting a specific polarized-light component. The polarized-light selective reflection layer has, on its observation-side surface, a roughened part for controlling the direction of interfacial reflection of imaging light that is projected on the polarized-light selective reflection layer. Imaging light (right-handed circularly polarized light in the selective reflection wave range) projected on the projection screen from a projector enters the polarized-light selective reflection layer and is diffuse-reflected inside this layer owing to the scattering property of the layer; this light is diffused as diffuse-reflected light, in directions included in an approximately constant range. On the other hand, part of the right-handed circularly polarized light projected on the projection screen from the projector is reflected, by interfacial reflection, from the inclined planes of the roughened part provided on the viewer side surface of the polarized-light selective reflection layer. The reflected light emerges from the polarized-light selective reflection layer in a direction different from the main direction in which the light diffuse-reflected from the polarized-light selective reflection layer emerges and returns to the observation side as light reflected by interfacial reflection.
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