US 11,940,639 B2
Optical device with one-way mirror
Chulwoo Oh, Cedar Park, TX (US); Ravi Kumar Komanduri, Austin, TX (US); David Kleinman, Cedar Park, TX (US); Vaibhav Mathur, Weston, FL (US); and David Manly, Fort Lauderdale, FL (US)
Assigned to Magic leap, Inc., Plantation, FL (US)
Filed by Magic Leap, Inc., Plantation, FL (US)
Filed on Mar. 24, 2021, as Appl. No. 17/211,457.
Claims priority of provisional application 62/994,739, filed on Mar. 25, 2020.
Prior Publication US 2021/0302636 A1, Sep. 30, 2021
Int. Cl. G02B 5/30 (2006.01); F21V 8/00 (2006.01); G02B 5/08 (2006.01); G02B 27/01 (2006.01); G02F 1/1335 (2006.01)
CPC G02B 5/305 (2013.01) [G02B 5/0808 (2013.01); G02B 5/3058 (2013.01); G02B 5/3083 (2013.01); G02B 6/0076 (2013.01); G02B 27/0172 (2013.01); G02F 1/133528 (2013.01); G02B 2207/101 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical device that is wearable on a head of a user, the optical device comprising:
a one-way mirror arranged on a world side of the optical device, the one-way mirror comprising:
a depolarizer including at least one retarder having random optical axis orientations such that the depolarizer receives light from the world side of the optical device and randomizes a polarization of at least a portion of the received light;
a polarization selective mirror oriented to receive light from the depolarizer and configured to transmit, through the polarization selective mirror, a portion of the received light having randomized polarization, the polarization selective mirror having a transmission axis; and
an absorptive polarizer oriented to receive the light transmitted through the polarization selective mirror, the absorptive polarizer having a transmission axis aligned with the transmission axis of the polarization selective mirror,
wherein the polarization selective mirror is disposed between the depolarizer and the absorptive polarizer; and
an actively variable dimmer comprising the absorptive polarizer, an additional polarizer, and an array of liquid crystal elements disposed between the absorptive polarizer and the additional polarizer, wherein the one-way mirror and the actively variable dimmer form an integrated structure by sharing the absorptive polarizer as a component of both the one-way mirror and the actively variable dimmer.