Stereoscopic video projection system
First Claim
Patent Images
1. A device for forming stereoscopic video images on a display surface comprising:
- a first synchronized video projection system and a second synchronized video projection system, each video projection system projecting a polarized beam of light, said polarized beam of light of each video projection system being polarized by an image forming element of each video projection system;
a first specially aligned retarder positioned between said first synchronized video projection system and said display surface so that a polarized beam of light of said first synchronized video projection system passes through said first specially aligned retarder;
a second specially aligned retarder positioned between said second synchronized video projection system and said display surface so that a polarized beam of light of said second synchronized video projection system passes through said second specially aligned retarder;
a first polarizing filter positioned between said first specially aligned retarder and said display surface so that said polarized beam of light of said first synchronized video projection system passes through said first polarizing filter; and
a second polarizing filter positioned between said second specially aligned retarder and said display surface so that said polarized beam of light of said second synchronized video projection system passes through said second polarizing filter.
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Abstract
A method and apparatus for reducing color shift resulting from the stereoscopic display of two polarized images by a pair of polarizing projectors each having a polarizing filter, or increasing the transmission of light which comprises the stereoscopic display, by placing a specially aligned retarder in the optical path between each polarizing projector and the corresponding polarizing filter.
90 Citations
24 Claims
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1. A device for forming stereoscopic video images on a display surface comprising:
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a first synchronized video projection system and a second synchronized video projection system, each video projection system projecting a polarized beam of light, said polarized beam of light of each video projection system being polarized by an image forming element of each video projection system; a first specially aligned retarder positioned between said first synchronized video projection system and said display surface so that a polarized beam of light of said first synchronized video projection system passes through said first specially aligned retarder; a second specially aligned retarder positioned between said second synchronized video projection system and said display surface so that a polarized beam of light of said second synchronized video projection system passes through said second specially aligned retarder; a first polarizing filter positioned between said first specially aligned retarder and said display surface so that said polarized beam of light of said first synchronized video projection system passes through said first polarizing filter; and a second polarizing filter positioned between said second specially aligned retarder and said display surface so that said polarized beam of light of said second synchronized video projection system passes through said second polarizing filter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for forming stereoscopic video images on a display surface comprising:
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a first synchronized liquid-crystal video projection system and a second synchronized liquid-crystal video projection system, each liquid-crystal video projection system projecting a polarized beam of light, said polarized beam of light of each liquid-crystal projection system being polarized by an image forming element of each liquid-crystal video projection system; a first specially aligned retarder positioned between said first liquid-crystal video projection system and said display surface so that a polarized beam of light of said first liquid-crystal video projection system passes through said first specially aligned retarder; a second specially aligned retarder positioned between said second liquid-crystal video projection system and said display surface so that a polarized beam of light of said second liquid-crystal video projection system passes through said second specially aligned retarder; a first polarizing filter positioned between said first specially aligned retarder and said display surface so that said polarized beam of light of said first liquid-crystal video projection system passes through said first polarizing filter; and a second polarizing filter positioned between said second specially aligned retarder and said display surface so that said polarized beam of light of said second liquid-crystal video projection system passes through said second polarizing filter. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A device for forming stereoscopic video images, including at least two synchronized video projection systems, each said projection system comprising:
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a. a light source, said light source projecting a beam of light along an optical path; b. a polarizing image forming element, said polarizing image forming element located along said optical path; c. a lens system, said lens system located along said optical path; d. a polarizing filter, said polarizing filter located along said optical path; and e. a specially aligned retarder, said specially aligned retarder located between said polarizing image forming element and said polarizing filter along said optical path. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for improving projection of a stereoscopic image using two liquid-crystal video projection systems, including the steps of:
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a. securing a first polarized filter between a lens system of a first video projection system and a display surface so that a light beam of said first video projection system will pass along a first path through said first polarizing filter; b. securing a second polarized filter between a lens system of a second video projection system and said display surface so that a light beam of said second video projection system will pass along a second path through said second polarizing filter, with a longitudinal axis of said second polarizing filter substantially orthogonal to a longitudinal axis of said first polarizing filter; c. placing a first retarder along the first path with a first side of said first retarder facing said lens system of said first video projection system and a second side of said first retarder facing said first polarizing filter wherein said first retarder has a normal axis; d. rotating said first retarder about said normal axis into a special alignment; e. placing a second retarder along the second path so that a first side of said second retarder faces said lens system of said second video projection system and a second side of said first retarder faces said second polarizing filter wherein said second retarder has a normal axis; and f. rotating said second retarder about said normal axis into a special alignment. - View Dependent Claims (20, 21, 22, 23)
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24. A method for reducing a color shift formed when two liquid-crystal video projection systems are used to form a stereoscopic image, the method comprising:
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a. securing a first polarized filter between a polarizing image forming element of a first video projection system and a lens system of a first video projection system so that a light beam of said first video projection system will pass along a first path through said first polarizing filter; b. placing a second polarized filter between a polarizing image forming element of a second video projection system and a lens system of a second video projection system so that a light beam of said second video projection system will pass along a second path through said second polarizing filter with a longitudinal axis of said second polarizing filter substantially orthogonal to a longitudinal axis of said first polarizing filter; c. placing a first retarder along the first path with a first side of said first retarder facing said last polarizing image forming element of said first video projection system and a second side of said first retarder facing said first polarizing filter wherein said first retarder has a normal axis; d. rotating said first retarder about said normal axis until said color shift has been minimized; e. placing a second retarder along the second path so that a first side of said second retarder faces a last polarizing image forming element of said second video projection system and a second side of said first retarder faces said second polarizing filter wherein said second retarder has a normal axis; and f. rotating said second retarder about said normal axis until said color shift has been minimized.
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Specification