Optical configurations for head-worn see-through displays

• US 10,564,426 B2
• Filed: 10/04/2017
• Issued: 02/18/2020
• Est. Priority Date: 07/08/2014
• 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., Bietry, Joseph, Haddick, John D.
• Primary Examiner(s): Choi, William
• Application Number:
  US15/724,297
• Publication Number:
  US 20180067319A1
• Time in Patent Office: 867 Days
• Field of Search: 359630, 345 7- 9
• CPC Class Codes: G02B 2027/0118 comprising devices for improving the contrast of the display / brillance control visibility
• CPC Class Codes: G02B 2027/0152 involving arrangement aiming to get lighter or better balanced devices
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 27/0176 characterised by mechanical features
• 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: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00

Abstract

An optical system for a head-worn computer includes an upper optical module adapted to convert illumination into image light by illuminating a reflective display through a field lens, wherein the image light is transmitted back through the field lens, then through a partially reflective partially transmissive surface and into a lower optic module adapted to present the image light to an eye of a user wearing the head-worn computer and the upper optical module being positioned within a housing for the head-worn computer and having a height of less than 24 mm, as measured from the reflective display to the bottom edge of the rotationally curved partial mirror.

Claims

1. An optical system for a wearable device, the optical system comprising:

an upper optical module adapted to;

illuminate a reflective display through a field lens;

receive image light from the illuminated reflective display via the field lens; and

present the image light to a lower optical module through a partially reflective partially transmissive surface; and

the lower optical module, comprising a rotationally curved partial mirror and adapted to present the image light presented by the upper optical module to an eye of a user of the wearable device;

wherein the upper optical module is configured to be positioned within a housing of the wearable device, and wherein a distance from the reflective display to a bottom of the rotationally curved partial mirror is less than 24 mm.

2. The optical system of claim 1, wherein the reflective display comprises an LCoS display.

3. The optical system of claim 1, wherein the reflective display comprises a DLP display.

4. The optical system of claim 1, wherein the reflective display comprises an OLED display.