| 摘要 |
An image display device including a polarization selective holographic optical device for diffracting illuminating light, and a reflection type spatial optical modulator for modulating the state of polarization of the illuminating light diffracted by the polarization selective holographic optical device is disclosed. The device includes a plurality of each of two areas of respectively different incidence polarization orientation dependencies of the refractive index, with the layers being layered sequentially alternately. An image display apparatus including the above image display device, a light source, an illuminating optical system and a projection optical system is also disclosed. With the present optical display device and optical display apparatus, the utilization efficiency of the illuminating light may be improved, while the device and the apparatus may be reduced in size and production cost, as uniformity and high contrast of the image displayed are achieved simultaneously. <IMAGE> |
