| 摘要 |
An object of the invention is to achieve a high intensity, a compact structure, a cost reduction and a heat radiation of a liquid crystal panel, in a projection type video display apparatus employing a combination of LED light sources and a light pipe. The light pipe is formed in a hollow type so as to be utilized as a cooling wind path. Further, a permeable or reflective baffle plate is provided within the light pipe. Further, the light pipe is formed by coating a mirror on an inner surface of an optical case integrally formed by fixing optical parts. Further, a dichroic mirror is arranged in an LED light source outgoing surface.
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