Projection display system
First Claim
Patent Images
1. An apparatus comprising:
- a diffuse reflecting polarizer that diffusively reflects light polarized in a first direction and transmits light polarized in a second direction; and
a second polarizer adjacent a back side of the diffuse reflecting polarizer, wherein the second polarizer is oriented to transmit light polarized in the second direction.
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Abstract
In one embodiment, a projection screen includes a diffuse reflecting polarizer that diffusively reflects light polarized in a first direction and transmits light polarized in a second direction. The projection screen may also include a second polarizer adjacent a back side of the diffuse reflecting polarizer, wherein the second polarizer is oriented to transmit light polarized in the second direction. The projection screen may appear substantially diffuse when viewed from a front side and substantially transparent when viewed from a back side.
56 Citations
35 Claims
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1. An apparatus comprising:
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a diffuse reflecting polarizer that diffusively reflects light polarized in a first direction and transmits light polarized in a second direction; and
a second polarizer adjacent a back side of the diffuse reflecting polarizer, wherein the second polarizer is oriented to transmit light polarized in the second direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system comprising:
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a multi-color transmissive projector that emits light in which all colors are substantially polarized in a common direction; and
a diffuse reflecting projection screen that reflects light polarized in a same direction as the light emitted from the projector, and transmits light polarized in a different direction as the light emitted from the projector. - View Dependent Claims (18, 19, 20, 21, 23, 24, 25, 26, 27, 28)
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29. A system comprising:
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a multi-color transmissive projector that emits light;
a rotator to rotate polarization of at least some of the light emitted from the projector such that all colors of light are polarized in a common direction; and
a projection screen onto which the light emitted from the projector is diffusely reflected, wherein the projection screen appears substantially diffuse when observed from one side of the screen and appears substantially transparent when observed from an opposite side of the screen. - View Dependent Claims (30)
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31. A method comprising:
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combining multiple colors of light such that all of the colors of light are substantially polarized in a first direction; and
projecting the combined colored light onto a display screen that diffusely reflects light polarized in the first direction and transmits light polarized in a second direction.
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32. A method comprising:
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combining multiple colors of light such that all of the colors of light are substantially polarized in a first direction; and
projecting the combined colored light onto a display screen that reflects light polarized in the first direction and absorb light polarized in the second direction.
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33. An apparatus comprising:
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a diffuse reflecting polarizer that diffusively reflects light polarized in a first direction and transmits light polarized in a second direction; and
a reflecting polarizer adjacent a back side of the diffuse reflecting polarizer, wherein the reflective polarizer is oriented to reflect light polarized in the first direction and transmit light polarized in the second direction such that the apparatus appears substantially transparent when viewed from a back side of the apparatus corresponding to a light incident side of the reflecting polarizer and appears substantially diffuse when viewed from a front side of the apparatus corresponding to a light incident side of the diffuse reflecting polarizer.
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34. An apparatus comprising:
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a diffuse reflecting polarizer that diffusively reflects light polarized in a first direction and transmits light polarized in a second direction; and
an absorbing polarizer adjacent a back side of the diffuse reflecting polarizer, wherein the absorbing polarizer is oriented to absorb light polarized in the first direction and transmit light polarized in the second direction such that the apparatus appears substantially transparent when viewed from a back side of the apparatus corresponding to a light incident side of the absorbing polarizer and appears substantially diffuse when viewed from a front side of the apparatus corresponding to a light incident side of the diffuse reflecting polarizer.
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35. An apparatus comprising:
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a means for combining multiple colors of light such that all of the colors of light are substantially polarized in a common direction;
a means for projecting the combined colors of light; and
a means for diffusely reflecting the projected combined colors of light, wherein the means for diffusely reflecting substantially transmits light that is not polarized in the common direction.
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Specification