Projecting images

G - Physics – 02 – B

Patent

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Details

G02B 27/18 (2006.01) G03B 21/10 (2006.01) G03B 21/60 (2006.01) G06F 1/16 (2006.01) H04N 5/74 (2006.01) G09F 13/04 (2006.01) G09F 13/14 (2006.01)

Patent

CA 2193790

An "extra-folded" projection display system includes a selectively reflective material (e.g., a linear reflecting polarizer) placed immediately behind the system's imaging screen. The display system includes an image projector that projects an image beam containing light of a predetermined linear polarization toward the imaging screen. The linear reflecting polarizer reflects the light in the image beam away from the screen. The reflected image beam then encounters a 1/4-wavelength achromatic retarder which converts the linear polarization to circular polarization. The image beam next hits a mirror that reflects the light back through the 1/4-wavelength achromatic retarder, which converts the circular polarization back to linear polarization, with the polarization director rotated 90° from the original polarization director. The linear reflecting polarizer then allows the light to pass through to the image screen.

ystème de projection d'affichage «à double conversion» comprenant un matériau refléchissant sélectif (p. ex., un polariseur linéaire réfléchissant) situé immédiatement derrière l'écran de visualisation du système. Le système est doté d'un appareil de projection, qui projette un faisceau image, dont la polarisation linéaire de la lumière est déterminée à l'avance, en direction de l'écran. Le polariseur linéaire réfléchit la lumière du faisceau image, qui se dirigeait vers l'écran, en direction d'un retardateur achromatique quart d'onde, qui convertit la polarisation linéaire en polarisation circulaire. Le faisceau image est ensuite réfléchi par un miroir, qui redirige le faisceau dans le retardateur achromatique quart d'onde, lequel reconvertit la polarisation circulaire en polarisation linéaire; le directeur de polarisation étant placé à un angle de 90 degrés par rapport à la position du directeur de polarisation initial. Le polariseur linéaire réfléchissant permet alors à la lumière d'atteindre l'écran.

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