Projection screen using dispersing lens array for asymmetric viewing angle
First Claim
Patent Images
1. A light dispersing screen, comprising:
- a first film having a first surface, a portion of the first surface defining a plurality of non-lenticular lenses;
wherein light passing through at least one of the non-lenticular lenses is formed into an image and is asymmetrically diverged so that light entering the first film in a direction substantially parallel to a film axis has a downward viewing angle different from an upward viewing angle relative to the film axis or has a leftward viewing angle different from a rightward viewing angle relative to the film axis.
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Abstract
Rear projection screens include a film layer having a plurality of lenses for diverging light horizontally and vertically. The horizontal viewing angle created by the lenses may be different from the vertical viewing angle. The light may be directed by the lenses in a particular direction, so that the direction of the maximum intensity light does not lie parallel to an axis normal to the screen surface. The lens film may be combined with an isotropic light disperser, such as a bulk diffuser.
77 Citations
47 Claims
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1. A light dispersing screen, comprising:
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a first film having a first surface, a portion of the first surface defining a plurality of non-lenticular lenses;
wherein light passing through at least one of the non-lenticular lenses is formed into an image and is asymmetrically diverged so that light entering the first film in a direction substantially parallel to a film axis has a downward viewing angle different from an upward viewing angle relative to the film axis or has a leftward viewing angle different from a rightward viewing angle relative to the film axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A rear projection screen assembly, comprising:
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a first layer having a first surface, a portion of the first surface defining a plurality of non-lenticular lenses; and
a symmetric light disperser optically coupled to the first surface to disperse light transmitted by the first layer;
wherein light passing through at least one of the non-lenticular lenses is formed into an image and is asymmetrically diverged, so that light entering the first film in a direction substantially parallel to a film axis has a downward viewing angle different from an upward viewing angle relative to the film axis or has a leftward viewing angle different from a rightward viewing angle relative to the film axis. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A light dispersing screen, comprising:
a first film having a first surface defining light imaging and diverging means for forming an image and for asymmetrically diverging light passing through the first film, so that light entering the first film in a direction substantially parallel to a film axis has a downward viewing angle different from an upward viewing angle relative to the film axis or has a leftward viewing angle different from a rightward viewing angle relative to the film axis. - View Dependent Claims (32, 33, 34)
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35. A light dispersing film, comprising:
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a first film having a first surface, a portion of the first surface defining a plurality of lenses, all of the lenses having dimensions less than one twentieth of a selected dimension of the first film;
wherein light passing through at least one of the lenses is formed into an image and is asymmetrically diverged, and the selected dimension is selected from film length and film width, so that light entering the first film in a direction substantially parallel to a film axis has a downward viewing angle different from an upward viewing angle relative to the film axis or has a leftward viewing angle different from a rightward viewing angle relative to the film axis. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification