Patent ID: 9606354
Date: 2017-03-28
CPC Classifications: G02B,G06F

Claim:
1. An apparatus comprising: a light guide including a proximal end, a distal end, a front surface and a back surface spaced apart from the front surface, an ambient input region on the front surface near the distal end, and an input/output region on the back surface near the distal end; a display positioned near the proximal end; a camera positioned at or near the proximal end to image ocular measurement radiation; a proximal optical element positioned in the light guide near the proximal end and a distal optical element positioned in the light guide near the distal end, wherein the proximal optical element is optically coupled to the display, the camera and the distal optical element such that it directs display light to the distal optical element and directs ocular measurement radiation received from the distal optical element to the camera, and wherein the distal optical element is optically coupled to the proximal optical element, the ambient input region and the input/output region such that it directs display light and ocular measurement radiation to the input/output region and directs ocular measurement radiation from the input/output region to the proximal optical element; and an input/output optical element positioned on the back surface over the input/output region and optically coupled to the input/output region, wherein the input/output region and the input/output optical element output display light, ambient light, and ocular measurement radiation from the light guide and input ocular measurement radiation to the light guide, wherein the display light and the ambient light are in a visible range of wavelengths and the ocular measurement radiation is in an invisible range of wavelengths, and wherein the input/output optical element applies optical power to the ocular measurement radiation and applies substantially no optical power to the display light and the ambient light.