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 system calibrates luminance of an electronic display. The system includes an electronic display, a luminance detection device, and a controller. The luminance detection device is configured to measure luminance parameters of active sections of the electronic display. The controller is configured to instruct the electronic display to activate sections in a sparse pattern and in a rolling manner and instruct the luminance detection device to measure luminance parameters for each of the active sections in the sparse pattern. The controller generates calibration data based on the measured luminance parameters of sections in the sparse pattern.

Abstract: The disclosed computer-implemented method may include a display calibration apparatus. The display calibration apparatus may include a lens and an actively-cooled electromagnetic radiation detector configured to detect electromagnetic radiation emitted from various pixels of an electronic display panel under test. The electromagnetic radiation may travel through the lens prior to reaching the detector. The display calibration apparatus may also include a special-purpose computing device configured to: analyze the detected electromagnetic radiation from the pixels of the electronic display panel and generate calibration data for the electronic display panel using a specified calibration algorithm. As such, the electronic display panel may operate using the generated calibration data. Various other methods, systems, and computer-readable media are also disclosed.

Abstract: The disclosed computer-implemented method may include a display calibration apparatus. The display calibration apparatus may include a lens and an actively-cooled electromagnetic radiation detector configured to detect electromagnetic radiation emitted from various pixels of an electronic display panel under test. The electromagnetic radiation may travel through the lens prior to reaching the detector. The display calibration apparatus may also include a special-purpose computing device configured to: analyze the detected electromagnetic radiation from the pixels of the electronic display panel and generate calibration data for the electronic display panel using a specified calibration algorithm. As such, the the electronic display panel may operate using the generated calibration data. Various other methods, systems, and computer-readable media are also disclosed.

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 a virtual image distance of eyecup assemblies of a head mounted display (HMD). The workstation includes an eyecup assembly feed assembly configured to receive an eyecup assembly of an HMD. The eyecup assembly comprising an optics block rigidly fixed to an electronic display panel. The workstation includes a lens assembly positioned at a fixed distance from the eyecup assembly. The workstation includes a movable imaging sensor assembly positioned along the alignment axis and configured to capture one or more images of the one or more test patterns presented by the eyecup assembly when the imaging sensor assembly is at different positions. The optical evaluation workstation includes a control module configured to determine one or more virtual image distances of the eyecup assembly using the plurality of images captured by the imaging sensor assembly.

Abstract: A system calibrates luminance of an electronic display. The system includes an electronic display, a luminance detection device, and a controller. The luminance detection device is configured to measure luminance parameters of active sections of the electronic display. The controller is configured to instruct the electronic display to activate sections in a sparse pattern and in a rolling manner and instruct the luminance detection device to measure luminance parameters for each of the active sections in the sparse pattern. The controller generates calibration data based on the measured luminance parameters of sections in the sparse pattern.

Abstract: A virtual reality (VR) headset calibration system calibrates a VR headset, which includes a plurality of locators and an inertial measurement unit (IMU) generating output signals indicative of motion of the VR headset. The system comprises a calibration controller configured to receive a headset model of the VR headset that identifies expected positions of each of the locators. The controller controls cameras to capture images of the VR headset while the headset is moved along a predetermined path. The images detect actual positions of the locators during the movement along the predetermined path. Calibration parameters for the locators are generated based on differences between the actual positions and the expected positions. Calibration parameters for the IMU are generated based on the calibration parameters for the locators and differences between expected and actual signals output by the IMU. The calibration parameters are stored to the VR headset.

Abstract: A system calibrates luminance of an electronic display panel. The system includes a luminance detection device, an actuator and a computing device. The luminance detection device comprises a plurality of detectors arranged along a width or length of the electronic display panel to simultaneously measure luminance parameters of at least one row or column of areas in the electronic display panel. Each of the plurality of detectors covers an area in the at least one row or column of the electronic display panel. The actuator is configured to cause a relative translational movement in a length direction or a width direction of the electronic display panel. The computing device is coupled to the luminance detection device to receive the measured luminance parameters, and the computing device is configured to generate calibration data for adjusting brightness of areas of the electronic display panel by processing the measured luminance parameters.

Abstract: A virtual reality (VR) headset calibration system calibrates a VR headset, which includes a plurality of locators and an inertial measurement unit (IMU) generating output signals indicative of motion of the VR headset. The system comprises a calibration controller configured to receive a headset model of the VR headset that identifies expected positions of each of the locators. The controller controls cameras to capture images of the VR headset while the headset is moved along a predetermined path. The images detect actual positions of the locators during the movement along the predetermined path. Calibration parameters for the locators are generated based on differences between the actual positions and the expected positions. Calibration parameters for the IMU are generated based on the calibration parameters for the locators and differences between expected and actual signals output by the IMU. The calibration parameters are stored to the VR headset.

Abstract: A system calibrates luminance of an electronic display panel. The system includes a luminance detection device, an actuator and a computing device. The luminance detection device comprises a plurality of detectors arranged along a width or length of the electronic display panel to simultaneously measure luminance parameters of at least one row or column of areas in the electronic display panel. Each of the plurality of detectors covers an area in the at least one row or column of the electronic display panel. The actuator is configured to cause a relative translational movement in a length direction or a width direction of the electronic display panel. The computing device is coupled to the luminance detection device to receive the measured luminance parameters, and the computing device is configured to generate calibration data for adjusting brightness of areas of the electronic display panel by processing the measured luminance parameters.

Abstract: An optical evaluation workstation evaluates quality metrics (e.g., virtual image distance) of eyecup assemblies of a head mounted display (HMD). The workstation includes an eyecup assembly feed assembly configured to receive an eyecup assembly of a head mounted display (HMD), the eyecup assembly comprising an optics block rigidly fixed at a first distance to an electronic display panel. The optical evaluation workstation includes a camera assembly configured to capture a plurality of images of the electronic display panel through the optics block, the camera assembly comprising a pinhole aperture at an exit pupil position and a camera attached to a lens assembly having an adjustable focus. The optical evaluation workstation includes a control module configured to determine one or more virtual image distances of the eyecup assembly using the plurality of images captured by the camera assembly.

Abstract: An apparatus for aligning an eyecup to an electronic display panel of a head-mounted display is presented in this disclosure. The eyecup is coupled to the electronic display panel forming an eyecup assembly. An imaging device captures one or more images of image light projected by the electronic display panel through the eyecup. A calibration controller, interfaced with the electronic display panel and the imaging device, determines physical locations of pixels of the electronic display panel on a sensor of the imaging device based on the captured one or more images. The calibration controller also determines a preferred alignment for presenting images by the electronic display panel based on the determined physical locations of the pixels and a projected location of the eyecup.

Abstract: An optical evaluation workstation evaluates quality metrics (e.g., sharpness, blemishes) of eyecup assemblies of a head mounted display (HMD). The workstation includes an eyecup assembly feeder, a camera, and a control module. The eyecup assembly feeder is configured to receive an eyecup assembly of a HMD, the eyecup assembly comprising an optics block rigidly fixed at a first distance to an electronic display panel. The camera is configured to capture one or more images of the one or more test patterns presented by the electronic display panel through the optics block. The control module is configured to modify at least one image of the one or more images using a transform, and determine a quality metric for the modified at least one image.

Abstract: A virtual reality (VR) headset calibration system calibrates a VR headset, which includes a plurality of locators and an inertial measurement unit (IMU) generating output signals indicative of motion of the VR headset. The system comprises a calibration controller configured to receive a headset model of the VR headset that identifies expected positions of each of the locators. The controller controls cameras to capture images of the VR headset while the headset is moved along a predetermined path. The images detect actual positions of the locators during the movement along the predetermined path. Calibration parameters for the locators are generated based on differences between the actual positions and the expected positions. Calibration parameters for the IMU are generated based on the calibration parameters for the locators and differences between expected and actual signals output by the IMU. The calibration parameters are stored to the VR headset.

Abstract: An optical calibration system is configured to determine camera calibration information of a virtual reality camera. The optical calibration system comprises a light source, a first and a second planar grid, and an optical calibration controller. The light source is configured to backlight the first and the second planar grids. Each planar grid includes a plurality of fiducial markers that are backlit by the light source. The optical calibration controller determines camera calibration information of a virtual reality camera selecting and analyzing a plurality of captured images that include a portion of the first or the second planar grid with fiducial markers backlit.