Importance

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Abstract

A projection apparatus includes a prism set, a light source, a reflective element, a light valve and a projection lens. The prism set includes a first prism having a first surface, a second surface and a third surface, and a second prism having a fourth surface opposite to the second surface, a fifth surface and a sixth surface. The reflective element, light valve and projection lens are respectively disposed adjacent to the third, fifth and sixth surfaces. The light source emits an illumination beam to the first surface. The non polarized illumination beam is reflected by the second surface and the reflective element. The non polarized illumination beam passes through the third, second, fourth and fifth surfaces in sequence. The non polarized illumination beam is converted by the light valve into an image beam which is reflected by the fourth surface and passes through the sixth surface to the projection lens in sequence.

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First Claim