LIGHT GUIDE INCLUDING CONJUGATE FILM
First Claim
1. An illumination apparatus comprising:
- a light guide panel having a first end for receiving light from a light source, said light guide panel comprising material that supports propagation of said light along the length of the light guide panel;
a plurality of indentations disposed on a first side of the light guide panel, the indentations configured to turn at least a substantial portion of the light incident on the first side and to direct said portion of light out a second, opposite side of the light guide panel, said indentations having sloping sidewalls that reflect light by total internal reflection out said second side of the light guide panel; and
at least one contoured transmissive surface comprising a plurality of protruding surface portions having substantially complimentary shape to corresponding of said plurality of indentations in said light guide panel, said at least one contoured transmissive surface separated from said light guide panel by a gap.
2 Assignments
0 Petitions
Accused Products
Abstract
In various embodiments described herein, a front light guide panel comprises a plurality surface relief features having a variety of different sloping surface portions. Light injected into an edge of the light guide propagates though the light guide until it strikes one of the surface relief features. The light is then turned by total internal reflection such that the light is directed onto a reflective modulator array rearward of the light guide panel. The light reflects from the modulator array and is transmitted back through the surface features of the light guide panel. However, depending upon where the light is incident on the surface features, the light will be refracted at different angles by the different sloping surface portions. As a result, light reflected from a single point on the modulator array appears to originate from different locations, and ghost images appear. To reduce such ghosting, a conjugate film having equal and opposite surface relief features is disposed forward of the light guide panel. Light reflected from the modulator array and passing through surface relief features on the light guide panel is refracted a second time by the conjugate film to return the rays to their original trajectory.
216 Citations
60 Claims
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1. An illumination apparatus comprising:
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a light guide panel having a first end for receiving light from a light source, said light guide panel comprising material that supports propagation of said light along the length of the light guide panel; a plurality of indentations disposed on a first side of the light guide panel, the indentations configured to turn at least a substantial portion of the light incident on the first side and to direct said portion of light out a second, opposite side of the light guide panel, said indentations having sloping sidewalls that reflect light by total internal reflection out said second side of the light guide panel; and at least one contoured transmissive surface comprising a plurality of protruding surface portions having substantially complimentary shape to corresponding of said plurality of indentations in said light guide panel, said at least one contoured transmissive surface separated from said light guide panel by a gap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. An method of manufacturing an illumination apparatus comprising:
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providing a light guide panel having a first end for receiving light from a light source, said light guide panel comprising material that supports propagation of said light along the length of the light guide panel; disposing a plurality of indentations on a first side of the light guide panel, the indentations configured to turn at least a substantial portion of the light incident on the first side and to direct said portion of light out a second, opposite side of the light guide panel, said indentations having sloping sidewalls that reflect light by total internal reflection out said second side of the light guide panel; and including at least one contoured transmissive surface comprising a plurality of protruding surface portions having substantially complimentary shape to corresponding of said plurality of indentations in said light guide panel, said at least one contoured transmissive surface separated from said light guide panel by a gap.
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51. An illumination apparatus comprising:
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means for guiding light having a means for receiving light from a means for emitting light, said light guiding means comprising means for supporting propagation of said light along the length of the light guiding means; means for turning at least a substantial portion of light incident on a first side of said light guiding means, the light turning means configured to direct said portion of light out a second, opposite side of the light guiding means, said light turning means having means for reflecting light by total internal reflection out said second side of the light guiding means; and means for transmitting light comprising means for providing a complimentary shape to corresponding of said light turning means in said light guiding means, said light transmitting means separated from said light guide means by means for separating. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60)
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Specification