Virtual reality (VR) and augmented reality (AR) use Near Eye Displays (NED’s) to project an image near the eye producing a seamless, interactive experience of a real-world for the user. In this growing market, VR is now used for more than just gaming. It can also be used to treat anxiety, recruitment and training, pain management, social cognition to mange autism, and more. But with this growing landscape, there is also an increased expectation for experiences to be consistent with the real world, offering ultra-crisp visuals that let one experience shadows and textures for example, in order to explore different worlds in a realistic but safe manner. Poor quality, inconsistent lighting will leave customers dissatisfied with a mediocre experience at best, and as a result manufacturers must ensure quality and control in production for light throughput and chromaticity.
Wide Choice of Quality Lenses
Any issues with uniformity or defects are greatly magnified by the NED technique and take away from the AR/VR experience. Traditional lenses which were designed for traditional flat screen displays and have distance limitations, are unable to take measurements in AR/VR applications because their aperture is found deep within the lens.
To correct this issue, Westboro Photonics supplies cost-effective lenses with unique characteristics specifically designed for AR/VR applications. The lens design puts the aperture much closer to the front face of the lens (17.5 mm and 13.4 mm for the 10 mm and 8 mm lenses respectively) allowing the lens to be placed inside the the NED system at the same location as the eye’s pupil. In addition, the entrance pupil is set to 5 mm to mimic human pupil diameters. These lenses have excellent MTF and distortion specifications with all data available. Lastly, because the aperture is closer to the lens edge, they are able to measure a larger 68-degree field of view which is better suited for VR devices. AR/VR lenses may be exchanged with other calibrated lenses allowing additional testing for displays outside of the device or on the production line.
Westboro’s cooled EF lens WP6P series imaging photometers when combined with a custom lens have an extremely small footprint which allows for simple fixturing to the device. Two instruments can be placed side-by-side, as close as 45 mm apart, which is less than the minimum pupillary distance allowing simple measurement of defects and differences from eye to eye. Standard measurements are luminance, chromaticity, contrast, uniformity, MTF along with pixel or line defects, mura and more.