A projection system incorporating a screen (2, 14) with a substantially achromatic response in a direction substantially perpendicular to the plane of the screen. The screen (2, 14) comprises a diffraction grating (4), means (5) for attenuating zero order and a diffuse holographic optical element (6). The system further comprises a focusing element with positive optical power. The aggregate optical power of the grating and the holographic optical element is substantially less than that of the focusing element.
申请公布号
WO9710523(A1)
申请公布日期
1997.03.20
申请号
WO1995GB02184
申请日期
1995.09.15
申请人
RICHMOND HOLOGRAPHIC RESEARCH & DEVELOPMENT LIMITE;ORR, EDWINA, MARGARET;TRAYNER, DAVID, JOHN