Eyepiece with switchable reflector for head wearable display

摘要

An eyepiece for a head wearable display includes a light guide component for guiding display light received at a peripheral location offset from a viewing region and emitting the display light along an eye-ward direction in the viewing region. The light guide component includes an input surface to receive the display light into the light guide component, an eye-ward facing side, a world facing side, a total internal reflection (“TIR”) portion disposed proximal to the input surface to guide the display light received through the input surface using TIR, and a partially reflective portion including a partially reflective element disposed over the eye-ward facing side and a switchable reflector disposed over the world facing side. The partially reflective portion is disposed to receive the display light from the TIR portion and to guide the display light via reflections off of the partially reflective element and the switchable reflector.

主权项

1. An eyepiece for a head wearable display, the eyepiece comprising:
a light guide component for guiding display light received at a peripheral location offset from a viewing region and emitting the display light along an eye-ward direction in the viewing region, the light guide component including:
an input surface oriented to receive the display light into the light guide component at the peripheral location;an eye-ward facing side;a world facing side;a total internal reflection (“TIR”) portion disposed proximal to the input surface to guide the display light received through the input surface using TIR off of the eye-ward and world facing sides; anda partially reflective portion including a partially reflective element disposed over the eye-ward facing side and a switchable reflector disposed over the world facing side, the partially reflective portion disposed distal to the input surface to receive the display light from the TIR portion and to guide the display light via reflections off of the partially reflective element and the switchable reflector, a display source to generate the display light; and a controller coupled to the display source and the switchable reflector to synchronize a first duty cycle that activates and deactivates the display source with a second duty cycle that activates and deactivates the switchable reflector, wherein the controller is coupled to adjust the first duty cycle of the display source to adjust a brightness of the display light and the second duty cycle of the switchable reflector to adjust a transparency of the eyepiece.