Patent ID: 9580015
Date: 2017-02-28
CPC Classifications: B60R,G02B,G09F

Claim:
1. An image display device comprising: an optical unit that generates image display light based on an image signal; a projection unit that projects the image display light generated by the optical unit; and a virtual image presenting surface that presents a virtual image by reflecting the image display light projected from the projection unit; wherein the projection unit includes: a first wave plate that converts linearly-polarized image display light emitted from an image display element into circularly-polarized image display light; a diffuser plate that diffuses the circularly-polarized image display light emitted from the first wave plate; a second wave plate that converts the circularly-polarized image display light diffused by the diffuser plate into linearly-polarized image display light; and a polarization plate that transmits the linearly-polarized image display light emitted from the second wave plate, wherein at least the second wave plate and the polarization plate are placed such that the second wave plate and the polarization plate serve as a projection port cover that blocks a projection port of the projection unit, and wherein the projection port cover is provided parallel to a plane that forms the projection port and emits the image display light along a projection axis running from the projection unit to the virtual image presenting surface.