| 摘要 |
An optical unit includes a light source, a color separator, reflection-type image display elements, a color synthesizer, a reflection-type polarization plate, and an optical chassis. The optical chassis holds the reflection-type polarization plate and the reflection-type image display elements thereon, and has a translucent window on an incident light side of the reflection-type polarization plate while an exiting light side of the reflection-type polarization plate is sealed with an incident surface of the color synthesizer. A hermetically sealed space is defined by the optical chassis, the reflection-type image display elements and the incident surface of the color synthesizer, and within the hermetically sealed space is disposed a translucent liquid having a refraction index from 1.2 to 1.9.
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