54‐5: Measuring Direct Retinal Projection Displays

Abstract

Direct retinal projection technology is a promising approach that can avoid vergence-accommodation conflict. But it introduces new measurement challenges. We demonstrate an evaluation system that can perform spatial as well as direct absolute spectral-based photometric and colorimetric measurements of these devices.

Real-Time Application of Computer Graphics Improvement Techniques Using Hyperspectral Textures in a Virtual Reality System

“…The measurement instrument employed in this work was a Konica-Minolta CS-2000 tele-spectroradiometer with a spectral resolution of 1 nm between 380 and 780 nm, a <2% radiance measurement error and CIE 1931 x = 0.0015; y = 0.0010 color error for an illuminant A. The measurements were performed through the lens of the HMD following the recommendations about color measurements in Near-eye displays (NEDs) [30][31][32]. To perform the measurements, we set up the virtual light booth showing only one color capsule at a central point on the booth floor.…”

51‐2: Distinguished Paper: Measuring Color Capability of Wide Color Gamut Near‐Eye Displays

“…These displays use red, green, and blue laser diodes to raster scan the image directly on the back of the retina. The light measuring device (LMD) needed to make accurate near-eye display measurements have certain optical requirements, such as small entrance pupil size [6,7]. However, the methodology used here to evaluate spectral bandwidth and spectral stray light can also be applied to other spectrometer designs.…”

Measuring color capability of wide color gamut near‐eye displays

“…In the case of retinal projection displays, an LMD with a diffusing element is necessary to improve the spatial uniformity of the entrance pupil response. 7 This provides an accurate measure of the retinal display luminance when the LMD entrance pupil is placed at the laser crossing point. However, the low luminance of the display used in this study precluded the use of a diffuser in the collection optics for accurate saturated color measurements.…”

“…These displays use RGB laser diodes to raster scan the image directly on the back of the retina. The LMD needed to make accurate near‐eye display measurements have certain optical requirements, such as small entrance pupil size 6,7 . However, the methodology used here to evaluate spectral bandwidth and spectral stray light can also be applied to other spectrometer designs.…”

“…We first investigated the influence of spectral stray light on the laser color measurements. In the case of retinal projection displays, an LMD with a diffusing element is necessary to improve the spatial uniformity of the entrance pupil response 7 . This provides an accurate measure of the retinal display luminance when the LMD entrance pupil is placed at the laser crossing point.…”