Waveguide including light turning gaps
First Claim
1. A waveguide including gaps for turning light comprising:
- planar surfaces extending a length of the waveguide including a top planar surface;
a plurality of gapped planes located within the waveguide surrounded by the planar surfaces, each gapped plane meeting the top planar surface tilted at a same angle;
each gapped plane includes a group of gaps occupying a fraction of an area of the respective plane; and
each of the gapped planes partially reflects out of the waveguide light received within a first angle range and transmits down the waveguide light received within a second angle range.
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Accused Products
Abstract
The technology provides embodiments for a waveguide including gaps which turn the direction of light. Each of a plurality of planes located within a waveguide includes a group of gaps so that each of the gapped planes partially reflects out of the waveguide light within a first angle range and transmits down the waveguide light received within a second angle range. In some examples, the waveguide is formed by joining optically transparent sections, and each group of gaps is formed in a surface of each optically transparent section which becomes a joining surface when bonded with an abutting all flat surface of an adjacent section. The waveguide may be used in displays, and in particular in near-eye displays (NED)s.
125 Citations
20 Claims
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1. A waveguide including gaps for turning light comprising:
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planar surfaces extending a length of the waveguide including a top planar surface; a plurality of gapped planes located within the waveguide surrounded by the planar surfaces, each gapped plane meeting the top planar surface tilted at a same angle; each gapped plane includes a group of gaps occupying a fraction of an area of the respective plane; and each of the gapped planes partially reflects out of the waveguide light received within a first angle range and transmits down the waveguide light received within a second angle range. - View Dependent Claims (2, 3, 4, 5)
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6. A optically transparent waveguide comprising:
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planar surfaces including a top planar surface and a bottom planar surface; joining surfaces, each joining surface having flat surface areas and a number of gaps and extending from the top planar surface to the bottom planar surface; each joining surface is tilted at a same angle with respect to the top planar surface; each gap of each joining surface reflecting out of the waveguide light received by the gap within a first angle range; and each gap of each joining surface passing for total internal reflection down the waveguide light received within a second angle range. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of making a waveguide using gaps for turning light comprising:
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forming a pseudo-randomized pattern of pits in one surface of each of a number N of optically transparent flat sections; tilting the pitted N optically transparent flat sections at a same angle with each of the pitted N surfaces facing in the same direction; stacking the tilted pitted N optically transparent flat sections into a stack with each of the pitted N surfaces facing the in the same direction so each pitted surface abuts an all flat surface of a respective adjacent optically transparent flat section; bonding the stack of N sections by bonding flat non-pitted portions of each of the pitted N surfaces to the all flat surface of the respective adjacent optical transparent flat section for forming a gap in each of the pits; slicing across the stack to form a waveguide including the N bonded sections tilted at the same angle, and polishing external planar surfaces of the sliced waveguide for satisfying total internal reflection (TIR) flatness criteria. - View Dependent Claims (18, 19, 20)
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Specification