Suppression of stray light in head worn computing

• US 10,705,339 B2
• Filed: 01/07/2017
• Issued: 07/07/2020
• Est. Priority Date: 01/21/2014
• Status: Active Grant

• Current Assignee: Mentor Acquisition One, LLC (Magic Leap, Inc.)
• Original Assignee: Mentor Acquisition One, LLC (Magic Leap, Inc.)
• Inventors: Border, John N.
• Primary Examiner(s): Huang, Wen
• Application Number:
  US15/400,982
• Publication Number:
  US 20170123213A1
• Time in Patent Office: 1,277 Days
• Field of Search: 359478, 359629-631, 359633, 359634, 359636, 359638, 359639, 345 7- 9, 348 1408, 348169, 348341
• CPC Class Codes: G02B 2027/0105 Holograms with particular structures
• CPC Class Codes: G02B 2027/012 comprising devices for attenuating parasitic image effects
• CPC Class Codes: G02B 2027/0174 holographic
• CPC Class Codes: G02B 27/01 Head-up displays
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 27/10 Beam splitting or combining systems polarising systems G02B27/28; mixing and splitting light signals using optical waveguides G02B6/28; beam shaping, e.g. changing the cross-sectional area, by dividing or superposing multiple light beams G02B27/0905
• CPC Class Codes: G02B 27/14 operating by reflection only
• CPC Class Codes: G02B 27/28 for polarising used in stereoscopes G02B30/25
• CPC Class Codes: G02B 27/283 used for beam splitting or combining
• CPC Class Codes: H04N 13/344 with head-mounted left-right displays
• CPC Class Codes: H04N 13/346 using prisms or semi-transparent mirrors

Abstract

Aspects of the present invention relate to suppression of stray light in head worn computing.

Claims

1. A method, comprising:

receiving image light;

reflecting a first portion of the image light via an angled reflective surface toward an eye of a user of a wearable head device;

transmitting a second portion of the image light via the angled reflective surface such that the second portion of the image light is absorbed within the wearable head device,

wherein the second portion of the image light is absorbed by an absorptive polarizer.

2. A wearable head device comprising:

an image source configured to produce image light;

a see-through display;

a combiner, wherein the wearable head device is configured to direct the image light towards the combiner, and wherein the wearable head device is further configured to permit a user to view the image light and a surrounding environment simultaneously via the see-through display; and

a stray light suppression system configured to suppress, within the wearable head device, a stray portion of the image light that is transmitted through the combiner,

wherein the stray light suppression system comprises a wavelength specific material and is configured to absorb a first wavelength of the image light and to allow a visible light bandwidth of the image light to pass.

3. A wearable head device comprising:

an image source configured to produce image light;

a see-through display;

a combiner, wherein the wearable head device is configured to direct the image light towards the combiner, and wherein the wearable head device is further configured to permit a user to view the image light and a surrounding environment simultaneously via the see-through display; and

a stray light suppression system configured to suppress, within the wearable head device, a stray portion of the image light that is transmitted through the combiner,

wherein the stray light suppression system comprises an absorptive polarizer.