Hitachi-lg Data Storage, Inc.

Kunikazu Onishi

Satoshi Ouchi

Toshiteru Nakamura

Mitsuru Nagasawa

In an optical unit of a projective display device which projects light source light reflected by a DMD, one prism of TIR prisms has a first boundary surface which is arranged in parallel to an emission surface of the light source light of other prism at a predetermined distance and on which the light source light from other prism is incident and a second boundary surface which is provided to face the DMD and emits the light source light illuminating the DMD and on which reflected light from the DMD is incident. When a swinging angle of minute mirrors of the DMD is set as &#xb1;&#x3b8;, a refractive index of the prisms is set as n, an angle formed by the first boundary surface and the second boundary surface is set as &#x3b2;, and an emission angle of the light source light with respect to the DMD in the second boundary surface is set as &#x3b1;, the swinging angle &#x3b8;, the refractive index n, the angle &#x3b2;, and the angle &#x3b1; satisfy a predetermined relation.

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Tokyo, Japan

Kunikazu Onishi