| US 7,525,728 B2 | ||
| Transmissive screen and rear projection display apparatus | ||
| Yasufumi Ogawa, Chiba (Japan); Takaaki Iwaki, Tokyo (Japan); Hiroaki Uchino, Tokyo (Japan); and Minoru Makida, Kanagawa (Japan) | ||
| Assigned to Sony Corporation, (Japan) | ||
| Filed on Oct. 18, 2006, as Appl. No. 11/583,242. | ||
| Claims priority of application No. P2005-304677 (JP), filed on Oct. 19, 2005. | ||
| Prior Publication US 2007/0121208 A1, May 31, 2007 | ||
| Int. Cl. G03B 21/60 (2006.01); G03B 21/56 (2006.01) | ||
| U.S. Cl. 359—457 [359/460] | 12 Claims |
| 1. A transmissive screen, comprising:
a first board member on a light source side, the first board member including a Fresnel lens on a surface of the light source
side and one of a vertical lenticular lens or a horizontal lenticular lens on a surface of a viewer side; and
a second board member on the viewer side, the second board member including the other of the vertical lenticular lens or the
horizontal lenticular lens;
the first board member including a diffusing layer between the Fresnel lens and the lenticular lens on the surface of the
viewer side at a position close to the Fresnel lens;
wherein a relation represented by θ≧tan−1(fp/2L) is obtained, where θ is a diffusion angle at which a distribution characteristic of diffused light passing through
the diffusing layer is half the peak gain, fp is a pitch of the Fresnel lens, and L is a light path between the diffusing
layer and the lenticular lens on the surface of the viewer side.
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