Granted Patent
B2
US 12,352,960 · App. 18/481,943 · Granted Jul 8, 2025
Waveguide architectures and related methods of manufacturing
Inventors:
Jonathan David Waldern (Diablo, CA); Milan Momcilo Popovich (Leicester, GB); Alastair John Grant (San Jose, CA)
Assignee:
DigiLens Inc.
G02B27/0103G02B6/0026G02B6/005G02B6/0065G02B27/0101G02B27/0179B60K35/00B60K35/654B60K2360/334G02B2027/011G02B2027/0123G02B2027/0125G02B2027/0132G02B2027/0187
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Abstract
Systems and methods for generating head-up displays (HUDs) using waveguides incorporating Bragg gratings in accordance with various embodiments of the invention are provided. The term HUD is typically utilized to describe a class of displays that incorporates a transparent display that presents data without requiring users to look away from their usual viewpoints. HUDs can be incorporated in any of a variety of applications including (but not limited to) vehicular and near-eye applications, such as googles, eyewear, etc. HUDs that utilize planar waveguides that incorporate Bragg gratings in accordance with various embodiments of the invention can achieve significantly larger fields of view and have lower volumetric requirements than HUDs implemented using conventional optical components.
Claims (28)
1. A waveguide display comprising:
a waveguide comprising a holographic polymer dispersed liquid crystal mixture (HPDLC) layer sandwiched between first and second transparent substrates, wherein the HPDLC layer comprises:
an input grating;
a fold grating; and
an output grating; and
an input image node optically coupled to the waveguide;
wherein:
the input grating is configured to receive light from the input image node and to cause the light to travel within the waveguide via total internal reflection to the fold grating;
the fold grating is configured to direct the light towards the output grating;
the output grating is configured to cause the light to exit the waveguide; and
wherein at least one of the input grating and the output grating is a multiplexed grating;
wherein the multiplexed gratings provided by at least one of the input grating and the output grating is configured to increase the field of view of the waveguide display by providing a first waveguide path for light forming a first portion of the field of view and a second waveguide path for light forming a second portion of the field of view; and
wherein the input and output gratings each multiplex first and second gratings, wherein a second fold grating is provided, wherein the first grating multiplexed into the input grating, the fold grating and the first grating multiplexed into the output grating together provide a first wavequide path for in-coupling, beam expanding and extracting a first field of view portion, wherein the second grating multiplexed into the input grating, the second fold grating and the second grating multiplexed into the output grating together provide a second waveguide path for in-coupling, beam expanding, and extracting a second field of view portion.
2. The waveguide display of claim 1 , wherein the input image node is coupled to the waveguide by an opto-mechanical interface that allows the waveguide to be mechanically disconnected from the input image node.
3. The waveguide display of claim 1 , wherein the waveguide is configured to direct light received from the input image node towards a vehicular windshield.
4. The waveguide display of claim 3 , wherein the waveguide is configured to distort the light exiting the waveguide such that the distorted light compensates for the curvature of the vehicular windshield.
5. The waveguide display of claim 1 , wherein the input grating and the output grating are configured to be reverse reciprocal of each other.
6. The waveguide display of claim 1 , wherein the input image node comprises a transparent prism for coupling light into the waveguide.
7. The waveguide display of claim 6 , wherein the transparent prism comprises a first surface for coupling light from the input image node into the prism, a second surface for coupling light out of the prism towards the waveguide, a third surface for providing an internal reflection, and a fourth surface opposing the third surface.
8. The waveguide display of claim 7 , wherein the third surface is configured to totally internally reflect the light, wherein the third and fourth surfaces provide a window for viewing an external scene.
9. The waveguide display of claim 1 , further comprising a second waveguide, wherein the two waveguides are configured to form a binocular waveguide display.
10. The waveguide display of claim 1 , wherein the waveguide further comprises a second fold grating, wherein the multiplexed grating is configured to direct a portion of incident light towards the first fold grating and to direct another portion of incident light towards the second fold grating.
11. The waveguide display of claim 1 , wherein the waveguide further comprises a quarter wave coating for rotating polarization of incoming light.
12. The waveguide display of claim 1 , wherein the fold grating is configured to provide pupil expansion in a first direction and the output grating is configured to provide pupil expansion in a second direction different than the first direction.
13. The waveguide display of claim 1 , wherein at least one of the input grating, fold grating, and output grating comprises a rolled K-vector grating.
14. The waveguide display of claim 1 , wherein the input image node comprises a light source.
15. The waveguide display of claim 14 , wherein the input image node further comprises a microdisplay panel.
16. The waveguide display of claim 1 , further comprising an eye tracker.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Jul 1, 2025
From: WALDERN, JONATHAN DAVID; POPOVICH, MILAN MOMCILO; GRANT, ALASTAIR JOHN
To: DIGILENS INC.
Reel/Frame 071585/0071 →
Continuity (6)
Provisional Application
62614947
· Jan 8, 2018
Provisional Application
62614949
· Jan 8, 2018
Provisional Application
62615000
· Jan 8, 2018
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