| 摘要 |
PROBLEM TO BE SOLVED: To thin a projection display device using a mirror array element as a light valve and to make luminance higher by improving the light utilization efficiency in the display device. SOLUTION: Illumination light to illuminate the mirror array element is bent by two reflection mirrors and made incident on a total reflection prism, and the reflection surface of the reflection mirror near the total reflection prism is installed in parallel with the optical axis of a projection lens or at the angle within 10 degrees, so that the display device is thinned. By setting the mutual angles of the two reflection mirrors, an illumination area is accurately aligned with the image area of the mirror array element, and the luminance can be made higher by improving the light utilization efficiency. COPYRIGHT: (C)2004,JPO
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