Measuring luminance and color of near-eye display virtual images

Photo Research develops solution which allows users to measure light from VR target areas in the range 0.3 – 6 mm.
Near-eye display devices, such as Virtual Reality (VR) and Augmented Reality (AR), operate by generating virtual images perceived by the human eye. Optical metrology of these devices poses challenges, and any radiance or luminance meter that is used to measure virtual images must conform to certain optical requirements. Photo Research has developed products designed to attach to its spectroradiometers that allows the user to measure light from VR target areas in the range 0.3 – 6 mm. Measurements include spectral radiance, luminance, chromaticity, and CCT. The principle is to use a fixed stop, located in the eye-box and sized to mimic the human pupil, as an entrance pupil to the spectroradiometer. This entrance pupil is mapped to the internal slit of the spectroradiometer using both standard Photo Research lenses and accessory lenses that are housed in the attachment. The VR accessories include a NIST-traceable calibration (2% accuracy) that is similar to the calibration of other Photo Research optical accessories. The Photo Research VR accessory is a robust, cost-effective solution for optical metrology in the near-eye display market.