IMPROVEMENTS IN OR RELATING TO AUGMENTED REALITY DISPLAY UNITS AND AUGMENTED REALITY HEADSETS COMPRISING THE SAME

Title:

IMPROVEMENTS IN OR RELATING TO AUGMENTED REALITY DISPLAY UNITS AND AUGMENTED REALITY HEADSETS COMPRISING THE SAME

Document Type and Number:

WIPO Patent Application WO/2019/186132

Kind Code:

A3

Abstract:

An augmented reality display unit for use in an augmented reality headset or the like comprising front and rear variable focusing power compression liquid lens assemblies (220, 230) in mutual optical alignment on an optical axis (O),a transparent waveguide display(240) interposed between the front and rear liquid lens assemblies (220, 230) and a selectively operable adjustment mechanism for adjusting the focusing powers of the front and rear compression liquid lens assemblies (220, 230); wherein each of the front and rear compression liquid lens assemblies (220, 230) comprises a fluid-filled envelope (225, 235) having a first wall formed by a distensible elastic membrane (226, 236) that is held under tension around its edge by a peripheral support ring, a second substantially rigid wall (223, 233) formed by or supported on an inner surface of a transparent plate or a hard lens of fixed focusing power, and a collapsible side wall (227, 237), the membrane forming an optical surface of variable optical power, and the adjustment mechanism being arranged to displace the support ring towards or away from the second wall parallel to the optical axis (O) for increasing or decreasing the pressure of the fluid (228, 238) within the envelope thereby to cause the membrane to distend or contract respectively parallel to the optical axis for changing the focusing power of the optical surface of the membrane(226, 236); wherein the second wall (223) of the front compression liquid lens (220) is formed by or supported on a transparent plate or hard lens (222) which is tilted at a first angle to the optical axis to introduce a first amount of prism to a ray of light passing therethrough, and the second wall (233) of the rear compression liquid lens is formed by or supported on a transparent plate or hard lens (232) which is tilted at a second angle to the optical axis to introduce a second amount of prism to a ray of light passing therethrough, wherein the first and second amounts of prism are mutually substantially equal and opposite.

Inventors:

JACOBY THOMAS NORMAN LLYN (GB)
STEVENS ROBERT EDWARD (GB)
HORROCKS SIMON PETER (GB)
EDGINTON ALEX (GB)

Application Number:

PCT/GB2019/050849

Publication Date:

November 14, 2019

Filing Date:

March 26, 2019

Export Citation:

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Assignee:

ADLENS LTD (GB)

International Classes:

G02B27/00; G02B3/14; G02B26/08; G02B27/01; G02C7/08; G02C7/14

Foreign References:

US20130300635A1	2013-11-14
US5526067A	1996-06-11
US20170168307A1	2017-06-15
US6318857B1	2001-11-20
TW200914878A	2009-04-01
US7986465B1	2011-07-26

Other References:

KRAMIDA GREGORY: "Resolving the Vergence-Accommodation Conflict in Head-Mounted Displays", IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS, IEEE SERVICE CENTER, LOS ALAMITOS, CA, US, vol. 22, no. 7, 1 July 2016 (2016-07-01), pages 1912 - 1931, XP011611904, ISSN: 1077-2626, [retrieved on 20160525], DOI: 10.1109/TVCG.2015.2473855