Patent ID: 8873148
Filing Date: 2014-10-28
Classification: G02B

Abstract:
1. An eyepiece for a head mounted display, the eyepiece comprising: a light relay body having a first end coupled to receive computer generated image (“CGI”) light from an image source and a second end including a viewing region from which the CGI light is emitted, wherein the light relay body includes a first oblique side; a total internal reflection (“TIR”) interface disposed in the viewing region at an oblique angle relative to an eye-ward side of the light relay body through which the CGI light is emitted from the eyepiece, the TIR interface oriented to redirect the light towards the eye-ward side of the light relay body; a focusing lens disposed along the eye-ward side of the light relay body in alignment with the TIR interface to bring the CGI light into focus for a near-to-eye arrangement; and a prism element having a second oblique side that mates to the first oblique side of the light relay body, wherein the TIR interface comprises a gap between the first and second oblique sides of the light relay body and the prism element, respectively, wherein the gap between the first and second oblique sides is formed by three standoffs disposed between the first and second oblique sides in a triangular pattern.