Novel method for the fast measurement of the three‐dimensional range of the eyebox of a VR device

Abstract

In a virtual reality (VR) device, the eyebox is an importance factor that is used to characterize the performance of the VR device. The conventional eyebox measurement method is quite time consuming as measurements must be performed at multiple positions to determine the three‐dimensional range. In this paper, a new measurement method is proposed that entails investigating the trajectories of the light rays extending from a specific position of the virtual image. These light rays form an identifiable brightness distribution pattern on the diffusing plane when this plane is located near the eye position of user. The positions of the pupil that allow the user to see the positions of the virtual image can be derived from the overlap of these distributions. Additionally, the three‐dimensional range of the eyebox can be determined by changing the position of the diffusing screen. Furthermore, the proposed method allows simultaneous measurement of the eyebox of the left and right eyes. Thus, the proposed method can be used to relatively quickly determine the three‐dimensional range of the eyebox.

A measurement method of the focal distance of the virtual image in an augmented reality or virtual reality device

“…For the example in this experiment, the diameter of the +5 D lens is approximately 60 mm, but the rays emitted from the sample device are distributed only within 15 mm near the eye position 11,16 . Therefore, the latter determines the value of A and relates to the eyebox of the AR/VR devices.…”

“…In the parallax method, the translating camera should remain inside the eyebox. For the selected sample display, the eyebox is slightly larger than 10 mm 11,16 . For example, for D o = 2.29 m and T = 0.01 m, the angle θ is calculated to be 0.25° from Equation .…”

“…And further performance improvements are important 4–6 . Several measurement methods to characterize the performance of these devices have been reported 7–16 . In most of AR/VR devices, a virtual image is formed in front of the eye at the specific focal distance except for devices using technologies such as retinal scanning displays 4,17 …”

A method to measure the uniformity of the virtual image distance in an augmented reality or virtual reality device

“…As the optical structures and performance of AR and VR devices are different from those of the typical flat panel display (FPDs), measurement methods for AR and VR devices are different from those for FPD. Hence, various new methods to measure the performance of VR and AR devices have been reported 10–19 . Virtual image distance, which is the distance to the virtual image, is an important factor in characterizing the performance of AR and VR devices.…”

“…Hence, various new methods to measure the performance of VR and AR devices have been reported. [10][11][12][13][14][15][16][17][18][19] Virtual image distance, which is the distance to the virtual image, is an important factor in characterizing the performance of AR and VR devices. The parallax method and focal methods have been reported as measurement methods for the virtual image distance.…”