Abstract: An eye-tracking system includes two mirrors. A first mirror is positioned to transmit light, received at a first incident angle, reflected off an eye of a user toward a second mirror. The first mirror is also positioned to reflect the light, reflected from the second mirror, at a second incident angle. The second mirror is inclined from the first mirror so that the light transmitted through the first mirror is reflected by the second mirror toward the first mirror at a first reflection angle. The light reflected by the second mirror is reflected by the first mirror toward the second mirror at a second reflection angle greater than the first reflection angle. The eye-tracking system also includes one or more sensors positioned to detect the light reflected by the first mirror and the second mirror for determining a gaze direction of the eye of the user.

Abstract: An eye-tracking system includes two mirrors. A first mirror is positioned to transmit light, received at a first incident angle, reflected off an eye of a user toward a second mirror. The first mirror is also positioned to reflect the light, reflected from the second mirror, at a second incident angle. The second mirror is inclined from the first mirror so that the light transmitted through the first mirror is reflected by the second mirror toward the first mirror at a first reflection angle. The light reflected by the second mirror is reflected by the first mirror toward the second mirror at a second reflection angle greater than the first reflection angle. The eye-tracking system also includes one or more sensors positioned to detect the light reflected by the first mirror and the second mirror for determining a gaze direction of the eye of the user.

Abstract: An alignment apparatus for a polarization device includes a polarizer subassembly for polarizing a light beam, a rotary support for rotatably supporting the polarization device in a path of the light beam downstream of the polarizer subassembly, an analyzer subassembly downstream of the rotary support for receiving the light beam propagated through the polarization device, and a photodetector array disposed downstream of the analyzer subassembly and extending along the width dimension of the light beam for detecting the light beam propagated through the analyzer subassembly. At least one of the polarizer or analyzer subassemblies includes a spatially variant polarization element having a polarization property varying along the width dimension of the light beam.

Abstract: An alignment apparatus for a polarization device includes a polarizer subassembly for polarizing a light beam, a rotary support for rotatably supporting the polarization device in a path of the light beam downstream of the polarizer subassembly, an analyzer subassembly downstream of the rotary support for receiving the light beam propagated through the polarization device, and a photodetector array disposed downstream of the analyzer subassembly and extending along the width dimension of the light beam for detecting the light beam propagated through the analyzer subassembly. At least one of the polarizer or analyzer subassemblies includes a spatially variant polarization element having a polarization property varying along the width dimension of the light beam.

Abstract: A head-mounted display device includes one or more infrared light sources configured to emit infrared light toward one or more eyes of a wearer, a first mirror configured to transmit the infrared light reflected from the one or more eyes of the wearer toward the first mirror, that reaches the first mirror at a first incident angle, the second mirror configured to reflect the infrared light transmitted through the first mirror, toward the first mirror so that the first mirror is configured to reflect the infrared light reflected by the second mirror, and incident on the first mirror at a second incident angle that is greater than the first incident angle, one or more sensors configured to detect the infrared light reflected by the first mirror and the second mirror for determining a gaze direction of the one or more eyes of the wearer.

Abstract: An alignment apparatus for a polarization device includes a polarizer subassembly for polarizing a light beam, a rotary support for rotatably supporting the polarization device in a path of the light beam downstream of the polarizer subassembly, an analyzer subassembly downstream of the rotary support for receiving the light beam propagated through the polarization device, and a photodetector array disposed downstream of the analyzer subassembly and extending along the width dimension of the light beam for detecting the light beam propagated through the analyzer subassembly. At least one of the polarizer or analyzer subassemblies includes a spatially variant polarization element having a polarization property varying along the width dimension of the light beam.

Abstract: An optical evaluation workstation evaluates quality metrics (e.g., optical contrast) of optical elements of a HMD. The workstation includes a test pattern, an optical element feed assembly, a light source, a camera and a control module. The light source backlights the test pattern with diffuse light. The optical element feed assembly receives an optical element of a HMD and places the optical element at a first distance from the test pattern corresponding to a distance between the optics block in the HMD and an exit pupil of the HMD. The camera images the test pattern through the optical element and the camera is positioned at a second distance from the test pattern corresponding to a distance between the exit pupil and an electronic display in the HMD. The control module generates a test report for presentation to a user based on the evaluation of the optical element.

Abstract: An electronic display is driven to compensate for aging of pixels in the electronic display. An aging factor is determined based on initial display data for a display portion of the electronic display during one or more monitored frames. The aging factor is indicative of aging of pixels in the display portion of the electronic display due to use corresponding to the initial display data. An aging counter for the display portion is increased based on the determined aging factor. A compensation value is determined for the display portion based on the aging counter for the display portion. Input display data for the display portion is modified during a subsequent frame according the determined compensation value. The display portion is driven with the modified input display data during the subsequent frame.

Abstract: An electronic display is driven to compensate for non-uniformity in a display property across display regions of the electronic display. Non-uniformity measures are determined for a set of electronic displays. A transformation is determined for converting the non-uniformity measures to transformed non-uniformity representations having fewer dimensions than a total number of the display regions in an electronic display. Using the transformation, a transformed non-uniformity representation for the electronic display is generated and stored, and an inverse transform is determined and stored. A system containing the electronic display generates correction values for the display regions by applying the inverse transformation to the transformed non-uniformity representation. Input display data for the electronic display is modified according to the generated correction values for the display regions. The electronic display is driven according the modified display data.

Abstract: An electronic display is driven to compensate for aging of pixels in the electronic display. An aging factor is determined based on initial display data for a display portion of the electronic display during one or more monitored frames. The aging factor is indicative of aging of pixels in the display portion of the electronic display due to use corresponding to the initial display data. An aging counter for the display portion is increased based on the determined aging factor. A compensation value is determined for the display portion based on the aging counter for the display portion. Input display data for the display portion is modified during a subsequent frame according the determined compensation value. The display portion is driven with the modified input display data during the subsequent frame.

Abstract: An electronic display is driven to compensate for aging of pixels in the electronic display. An aging factor is determined based on initial display data for a display portion of the electronic display during one or more monitored frames. The aging factor is indicative of aging of pixels in the display portion of the electronic display due to use corresponding to the initial display data. An aging counter for the display portion is increased based on the determined aging factor. A compensation value is determined for the display portion based on the aging counter for the display portion. Input display data for the display portion is modified during a subsequent frame according the determined compensation value. The display portion is driven with the modified input display data during the subsequent frame.

Abstract: An optical evaluation workstation evaluates quality metrics (e.g., optical contrast) of optical elements of a HMD. The workstation includes a test pattern, an optical element feed assembly, a light source, a camera and a control module. The light source backlights the test pattern with diffuse light. The optical element feed assembly receives an optical element of a HMD and places the optical element at a first distance from the test pattern corresponding to a distance between the optics block in the HMD and an exit pupil of the HMD. The camera images the test pattern through the optical element and the camera is positioned at a second distance from the test pattern corresponding to a distance between the exit pupil and an electronic display in the HMD. The control module generates a test report for presentation to a user based on the evaluation of the optical element.

Abstract: An electronic display is driven to compensate for aging of pixels in the electronic display. An aging factor is determined based on initial display data for a display portion of the electronic display during one or more monitored frames. The aging factor is indicative of aging of pixels in the display portion of the electronic display due to use corresponding to the initial display data. An aging counter for the display portion is increased based on the determined aging factor. A compensation value is determined for the display portion based on the aging counter for the display portion. Input display data for the display portion is modified during a subsequent frame according the determined compensation value. The display portion is driven with the modified input display data during the subsequent frame.