Light with bi-directional propagation
First Claim
Patent Images
1. A display device comprising:
- a reflective spatial light modulator;
a first light guide aligned over said modulator, said first light guide comprising a top surface disposed distal to said modulator and a bottom surface disposed proximate to said modulator, said first light guide further comprising a first end surface and a second end surface;
a second light guide disposed between said modulator and said first light guide, said second light guide comprising a top surface disposed distal to said modulator and a bottom surface disposed proximate to said modulator, said second light guide further comprising a first end surface and a second end surface;
a light source in optical communication with said first light guide and said second light guide, said light source configured to provide light through the first end surface of said first light guide and through the first end surface of said second light guide; and
a turning mirror disposed to receive light emitted from said second light guide second end surface and direct said light to the second end surface of said first light guide,said first light guide further comprising turning features configured to direct light that enters said first light guide first end surface and light that enters said first light guide second end surface through the bottom surface of said first light guide to said modulator.
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Accused Products
Abstract
Devices for providing illumination to a display and method for manufacturing the same. In one embodiment, a display device includes a reflective display and turning features for turning light propagating from opposite directions in a light guide to the reflective display.
503 Citations
35 Claims
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1. A display device comprising:
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a reflective spatial light modulator; a first light guide aligned over said modulator, said first light guide comprising a top surface disposed distal to said modulator and a bottom surface disposed proximate to said modulator, said first light guide further comprising a first end surface and a second end surface; a second light guide disposed between said modulator and said first light guide, said second light guide comprising a top surface disposed distal to said modulator and a bottom surface disposed proximate to said modulator, said second light guide further comprising a first end surface and a second end surface; a light source in optical communication with said first light guide and said second light guide, said light source configured to provide light through the first end surface of said first light guide and through the first end surface of said second light guide; and a turning mirror disposed to receive light emitted from said second light guide second end surface and direct said light to the second end surface of said first light guide, said first light guide further comprising turning features configured to direct light that enters said first light guide first end surface and light that enters said first light guide second end surface through the bottom surface of said first light guide to said modulator. - 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)
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27. A display device comprising:
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a first light guide comprising a front and back surface and edge surfaces, said first light guide configured to receive light through two or more edge surfaces, and direct said received light towards said back surface; a second light guide comprising a front and back surface and edge surfaces, said front surface of said second light guide disposed under said back surface of said first light guide, said second light guide configured to receive light through one or more edge surfaces and emit light through at least one edge surface; a turning mirror disposed to receive light emitted from said second light guide, and direct said light into at least one edge surface of said first light guide; and a reflective spatial light modulator disposed such that the second light guide is between said first light guide and said reflective spatial light modulator. - View Dependent Claims (28, 29)
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30. A method of manufacturing a display device comprising:
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providing a reflective spatial light modulator; aligning a first light guide over said reflective spatial light modulator, said first light guide having a first surface and a second surface; disposing a second light guide between said modulator and said first light guide, said second light guide having a first surface and a second surface; disposing a light source relative to said first and second light guides, said light source configured to provide light into said first surface of said first light guide and said first surface of said second light guide; and disposing a turning mirror relative to said first and second light guides, said turning mirror configured to receive light emitted from said second surface of said second light guide and direct said light into said second surface of said first light guide. - View Dependent Claims (31)
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32. A display device comprising:
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reflective display means; a first light guide comprising a front and back surface and edge surfaces, said first light guide configured to receive light through two or more edge surfaces, and direct said received light towards said back surface;
a second light guide comprising a front and back surface and edge surfaces, said front surface of said second light guide disposed under said back surface of said first light guide, said second light guide configured to receive light through one or more edge surfaces and emit light through at least one edge surface;
lighting means for providing light through the first end surface of said first light guide and through the first end surface of said second light guide; and
light turning means for receiving light emitted from said second light guide and directing said light into at least one edge surface of said first light guide, wherein said first light guide is configured to direct light propagating therein to said reflective display means. - View Dependent Claims (33, 34, 35)
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Specification