Enhanced imaging system for linear micro-displays

• US 10,553,139 B2
• Filed: 11/10/2016
• Issued: 02/04/2020
• Est. Priority Date: 11/10/2016
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Inventors: Bohn, David D.
• Primary Examiner(s): Lei, Jie
• Application Number:
  US15/348,911
• Publication Number:
  US 20180130391A1
• Time in Patent Office: 1,181 Days
• Field of Search: 359 13, 359618, 359630-633, 345 7, 345 8, 345 32
• CPC Class Codes: G02B 26/0883 the refracting element being a prism
• CPC Class Codes: G02B 26/108 having one or more prisms as scanning elements
• CPC Class Codes: G02B 27/0093 with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G06F 3/013 Eye tracking input arrangements G06F3/015 takes precedence
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/02 by tracing or scanning a light beam on a screen

Abstract

An optical system comprises a linear illumination source configured to emit light, a first scanning stage configured to receive the light and to scan the light, and a second scanning stage. The linear illumination source is configured to generate light forming a vertical field of view based on the one or more output signals received from a controller modulating the one or more output signals comprising image data defining content. The first scanning stage redirects portions of the light to generate an output defining a horizontal field of view based on the one or more output signals of the controller. The first scanning device combines the vertical field of view and the horizontal field of view in the output light to create a two-dimensional light image of the content. The second scanning stage receives and directs the output of the first scanning stage toward a projected exit pupil.

Claims

1. An optical system, comprising:

a controller modulating one or more output signals comprising image data defining image content;

a linear array generating light forming a vertical field of view of the image content based on the one or more output signals;

a first scanning stage for receiving the light from the linear array, wherein the first scanning device redirects portions of the light from the linear array to generate an output light defining a horizontal field of view of the image content based on the one or more output signals of the controller, wherein the first scanning device combines the vertical field of view formed by the linear array and the horizontal field formed by the first scanning device to create a two-dimensional light image of the content;

a second scanning stage configured to receive the output light from the first scanning stage, wherein the second scanning stage directs the output light comprising the two-dimensional light image of the content toward a projected exit pupil; and

a partially reflecting mirror positioned to receive the output light from the second scanning stage by the projected exit pupil, wherein the partially reflecting mirror directs at least a portion of the output light for facilitating a view of a real-world background to the image content.

2. The optical system of claim 1, wherein one or more of the first scanning stage and the second scanning stage comprises a Risley prism pair.

3. The optical system of claim 1, wherein the first scanning stage comprises a linear array of electrowetting microprisms to perform a non-mechanical steering of the light at angles controlled by the one or more output signals.

4. The optical system of claim 3, wherein one or more of the first scanning stage and the second scanning stage comprises a liquid crystal element.

5. The optical system of claim 3, wherein one or more of the first scanning stage and the second scanning stage comprises a plurality of electrowetting lenses.

6. The optical system of claim 1, further comprising a waveguide positioned to receive the output light from the second scanning stage at the projected exit pupil, wherein the waveguide comprises a pupil replication stage to replicate and expand the exit pupil using a surface relief grating.

7. The optical system of claim 6, wherein the waveguide comprises:

an input section for receiving light at the exit pupil;

a pupil replication stage; and

a plurality of reflecting surfaces for reflecting the output light from the input section to the pupil replication stage.