| 摘要 |
A projection type video display apparatus has a lighting system, which comprises a multiplicity of light sources (11, 12) for emitting substantially parallel beams of light, a half-mirror (13), and a total-reflection mirror (14). The half mirror and the total-reflection mirror are arranged to transmit and/or reflect these beams to illuminate substantially the same entire region of an integrator lens (14). As a result, a high-quality image having no unbalanced white or black dolor uniformity can be obtained even when the light sources are used only partially. This arrangement can be obtained using an inexpensive half-mirror and total-reflection mirror. Moreover, there is no need of precisely positioning the mirrors in alignment with a large number of convex lenses constituting the integrator lens. Thus, the projector can be manufactured at low cost.
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