Granted Patent
B2
US 12,271,035 · App. 18/362,870 · Granted Apr 8, 2025
Waveguides incorporating transmissive and reflective gratings and related methods of manufacturing
Inventors:
Jonathan David Waldern (Diablo, CA); Alastair John Grant (San Jose, CA); Hyesog Lee (Sunnyvale, CA); Gerald Buxton (Sunnyvale, CA); Milan Momcilo Popovich (Leicester, GB)
Assignee:
DigiLens Inc.
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Abstract
Multiplexed reflection and transmission gratings, and methods of their manufacture, are provided that improve uniformity with laser light, that is, reduced banding and other illumination artifacts occurring in waveguides. The mechanism for this can be the multiple reflections between the waveguide reflecting surfaces and the reflection hologram, which promote illumination averaging as beam propagation processes within a waveguide. In some gratings, a beam splitter layer overlapping the multiplexed gratings can be provided for the purposes of reducing banding in a laser-illuminated waveguide. The beam splitter can be provided by one or more dielectric layers. The beamsplitter can have sensitivity to one polarization. The beamsplitter can be sensitive to S-polarization. The beam splitter can be an anti-reflection coating optimized for normal incidence that becomes reflective at high TIR angles when immersed in glass or plastic.
Claims (33)
1. A waveguide display, comprising:
a source of light modulated with an image data; and
a waveguide comprising:
at least one transmission grating;
at least one reflection grating, wherein said at least one reflection grating and said at least one transmission grating at least partially overlap; and
at least one input coupler for coupling light from said source of light into a total internal reflection (TIR) path in said waveguide towards the at least partially overlapping at least one transmission grating and at least one reflection grating,
wherein said at least one transmission grating and said at least one reflection grating have K-vectors configured to beam-expand light from the input grating in two directions and extract light from the input grating towards a viewer.
2. The waveguide display of claim 1 , wherein said at least one reflection grating and said at least one transmission grating are multiplexed in a single grating layer.
3. The waveguide display of claim 1 , wherein said at least one input coupler is a grating.
4. The waveguide display of claim 1 , wherein:
said at least one input coupler comprises an input transmission grating;
said at least one transmission grating comprises a fold transmission grating and an output transmission grating; and
at least one of said input, fold, and output transmission gratings is multiplexed with said at least one reflection grating.
5. The waveguide display of claim 1 , wherein:
said at least one input coupler comprises an input transmission grating;
said at least one transmission grating comprises at least first and second fold transmission gratings;
said at least one reflection grating overlaps at least one of said input transmission grating and said first and second fold transmission gratings;
said first and second fold transmission gratings overlap each other;
said first and second fold transmission gratings have crossed K-vectors; and
each of the fold transmission gratings is configured to beam-expand light from the input grating and couple it towards the other fold transmission grating, which then beam-expand and extract light towards a viewer,
wherein said at least one transmission grating and said at least one reflection grating first and second fold transmission gratings include gratings with crossed K-vectors.
6. The waveguide display of claim 1 , wherein each of said gratings has a grating vector that in combination provide a resultant vector with substantially zero magnitude.
7. The waveguide display of claim 1 , wherein said light undergoes a dual interaction within at least one of said gratings.
8. The waveguide display of claim 1 , further comprising a beam splitter layer overlapping said at least one reflection grating.
9. The waveguide display of claim 1 , further comprising an alignment layer overlapping said at least one reflection grating.
10. The waveguide display of claim 1 , wherein said source of data modulated light is one selected from the group consisting of: a laser-scanning projector, a microdisplay panel, and an emissive display.
11. The waveguide display of claim 1 , wherein said source of light provides at least two different wavelengths.
12. The waveguide display of claim 1 , wherein at least one of said gratings is characterized by a spatial variation of a property selected from the group consisting of: refractive index modulation, K-vector, grating vector, grating pitch, and birefringence.
13. The waveguide display of claim 1 , wherein said gratings are configured to provide a plurality of separate optical paths for a property selected from the group consisting of: wavelength band, angular bandwidth, and polarization state.
14. The waveguide display of claim 1 , wherein said waveguide is curved.
15. The waveguide display of claim 1 , wherein said waveguide incorporates a GRIN structure.
16. The waveguide display of claim 1 , wherein said waveguide is plastic.
17. The waveguide display of claim 1 , wherein at least one of said gratings comprises a structure selected from the group consisting of: a switchable Bragg grating recorded in a holographic photopolymer a HPDLC material, a switchable Bragg grating recorded in a uniform modulation holographic liquid crystal polymer material, a Bragg grating recorded in a photopolymer material, and a surface relief grating.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Jan 31, 2024
From: WALDERN, JONATHAN DAVID; GRANT, ALASTAIR JOHN; LEE, HYESOG; BUXTON, GERALD; POPOVICH, MILAN MOMCILO
To: DIGILENS INC.
Reel/Frame 066403/0837 →
Continuity (4)
Provisional Application
62858928
· Jun 7, 2019
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