Wednesday, May 2025
04:10 PM - 04:30 PM
Room: LL21AB
Session: AR/VR Measurement
Eye-Box Measurement for Augmented-Reality Waveguides with Pupil Expansion
Description:
The eye box is a key characteristic of the near-eye display, which describes the three-dimensional space in which the near-eye display device can clearly and completely see the virtual image. The size of the eye box determines the range of positions in which the near-eye display device can accommodate eye movement for users with different interpupillary distances. Conventional methods of obtaining the size of the eye box based on the luminance or MTF scanning of the near-eye display eye area are cumbersome and time-consuming, The selection of the reference luminance and the threshold luminance is difficult in augmented reality due to the luminance non-uniformity in eye box of pupil-extended waveguide. This paper proposes a method for measuring the size of the eye box in augmented reality devices with a pupil-extended waveguide scheme. The method is based on the analysis of the luminance distribution of the outer boundary field of view of the eye box, with the aim of obtaining the eye box size. The analysis focuses on the luminance distribution of the boundary field of view outside. The eye box region is analyzed to obtain the eye box size under a specific eye relief. This is achieved by combining the parameters of the luminance distribution with the field-of-view calculations. As a result, this method can also be used to determine the 3 dimensions of the eye box for augmented reality waveguides with pupil expansion. The method is both efficient and rapid, requiring only the light distribution map of the boundary field of view outside the eye box area for analysis of the 3D size of the eye box on the device.