EDGE SHADOW REDUCING METHODS FOR PRISMATIC FRONT LIGHT
First Claim
Patent Images
1. An illumination apparatus comprising:
- a light source;
a light guide having first and second ends and a length therebetween such that light from the light source injected into said first end of the light guide propagates toward the second end, said light guide comprising non-overlapping first and second regions along said second end; and
a plurality of turning features in the light guide that reflect light incident thereon out the light guide, the turning features in said light guide generally facing a first region at said second end of said light guide such that light injected into said first end of said light guide is configured to be more efficiently reflected out from said first region of said light guide than from said second region,wherein said light source is configured to direct more light into said light guide towards a second region at said second end of said light guide rather than towards the first region of said light guide thereby increasing uniformity of light output across said light guide.
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Abstract
Embodiments herein relate to light systems designed to reduce Moiré interference while simultaneously reducing dark regions due to the edge shadow effect. For example, configurations of light sources, light guides and turning features may direct light across a display while reducing Moiré interference.
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Citations
79 Claims
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1. An illumination apparatus comprising:
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a light source; a light guide having first and second ends and a length therebetween such that light from the light source injected into said first end of the light guide propagates toward the second end, said light guide comprising non-overlapping first and second regions along said second end; and a plurality of turning features in the light guide that reflect light incident thereon out the light guide, the turning features in said light guide generally facing a first region at said second end of said light guide such that light injected into said first end of said light guide is configured to be more efficiently reflected out from said first region of said light guide than from said second region, wherein said light source is configured to direct more light into said light guide towards a second region at said second end of said light guide rather than towards the first region of said light guide thereby increasing uniformity of light output across said light guide. - 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)
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26. An illumination apparatus comprising:
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a light guide having first and second ends and a length therebetween such that light injected into said first end propagates toward a second end, said light guide having a width and thickness; and a plurality of turning features disposed on a first side of the light guide, said turning features comprising sloping sidewalls that reflect light incident thereon out a second side of the light guide, each of said turning features comprising a plurality of linear segments, at least one first segment of said plurality of segments being oriented obliquely with respect to at least one second segment of said plurality of segments, wherein none of said segments intersect more than two other turning features. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. An illumination apparatus comprising:
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a light guide having first and second ends and a length therebetween such that light injected into said first end propagates toward a second end; and a plurality of diagonal turning elements, each diagonal turning element comprising a plurality of turning features disposed on a first side of the light guide, said turning features comprising sloping sidewalls that reflect light incident thereon out a second side of the light guide, wherein one side of the turning features in each diagonal turning element being arranged along a line, the line being non-normal and non-parallel to the length of the light guide, and wherein the orientation of said turning features in said diagonal turning elements are different from the orientation of the respective diagonal turning element. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68)
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69. An illumination apparatus comprising:
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a light guide having first and second ends and a length therebetween such that light injected into said first end propagates toward a second end; and a plurality of turning features disposed on a first side of the light guide, said turning features comprising sloping sidewalls that reflect light incident thereon out a second side of the light guide, said turning features comprising linear paths orthogonal to the length of the light guide, said turning features having a first length, said turning features having two ends that do not contact other turning features or ends or edges of the light guide, wherein said first length is configured such that the individual turning features are undistinguishable by an unaided human eye. - View Dependent Claims (70, 71)
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72. An illumination apparatus comprising:
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a means for producing light; a means for guiding light having first and second ends and a length therebetween such that light from the light-producing means injected into said first end of the light-guiding means propagates toward the second end, said light-guiding means comprising non-overlapping first and second regions along said second end; and a plurality of means for turning light in the light-guiding means that reflect light incident thereon out the light-guiding means, the light-turning means in said light-guiding means generally facing a first region at said second end of said light-guiding means such that light injected into said first end of said light-guiding means is configured to be more efficiently reflected out from said first region of said light-guiding means than from said second region, wherein said light-producing means is configured to direct more light into said light-guiding means towards a second region at said second end of said light-guiding means rather than towards the first region of said light-guiding means thereby increasing uniformity of light output across said light-guiding means. - View Dependent Claims (73)
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74. An illumination apparatus comprising:
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means for guiding light having first and second ends and a length therebetween such that light injected into said first end propagates toward a second end, said light-guiding means having a width and thickness; and a plurality of means for turning light disposed on a first side of the light-guiding means, said light-turning means comprising means for reflecting light incident thereon out a second side of the light-guiding means, each of said light-turning means comprising a plurality of linear segments, at least one first segment of said plurality of segments being oriented obliquely with respect to at least one second segment of said plurality of segments, wherein none of said segments intersect more than two other segments. - View Dependent Claims (75)
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76. An illumination apparatus comprising:
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means for guiding light having first and second ends and a length therebetween such that light injected into said first end propagates toward a second end; and a plurality of diagonal means for directing light, each diagonal light-directing means comprising a plurality of means for turning light disposed on a first side of the light-guiding means, said light-turning means comprising means for reflecting light incident thereon out a second side of the light-guiding means. - View Dependent Claims (77)
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78. An illumination apparatus comprising:
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means for guiding light having first and second ends and a length therebetween such that light injected into said first end propagates toward a second end; and a plurality of means for turning light disposed on a first side of the light guiding means, said light turning means comprising means for reflecting light incident thereon out a second side of the light guide, said light turning means comprising linear paths orthogonal to the length of the light guiding means, said light turning means having a first length, said light turning means having two ends that do not contact other light turning means or ends or edges of the light guiding means, wherein said first length is configured such that the individual light turning means are undistinguishable by an unaided human eye. - View Dependent Claims (79)
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Specification