Tomographic near-eye displays

Abstract

The ultimate 3D displays should provide both psychological and physiological cues for depth recognition. However, it has been challenging to satisfy the essential features without making sacrifices in the resolution, frame rate, and eye box. Here, we present a tomographic near-eye display that supports a wide depth of field, quasi-continuous accommodation, omni-directional motion parallax, preserved resolution, full frame, and moderate field of view within a sufficient eye box. The tomographic display consists of focus-tunable optics, a display panel, and a fast spatially adjustable backlight. The synchronization of the focus-tunable optics and the backlight enables the display panel to express the depth information. We implement a benchtop prototype near-eye display, which is the most promising application of tomographic displays. We conclude with a detailed analysis and thorough discussion of the display's optimal volumetric reconstruction. of tomographic displays.

Light source optimization for partially coherent holographic displays with consideration of speckle contrast, resolution, and depth of field

“…The limited depth of field is a critical bottleneck of partially coherent holographic displays. Inspired by previous works using a tunable-focus lens for gaze-contingent displays 47 or tomographic displays 13 , 48 , we can consider an adaptive focus holographic display system. According to the gaze direction, the depth information of the scene is adjusted to reconstruct gazed objects mostly within the limited depth of field.…”

“…Recently, various researches related to holographic near-eye displays 2 – 4 have been introduced to show a new possibility of realizing an ultimate near-eye display. The intrinsic optical principle of holographic displays, wavefront modulation using a coherent light source, carries several advantages for near-eye displays compared to other approaches including multi-plane displays 5 – 8 , light field displays 9 , 10 , volumetric displays 11 – 13 , and gaze-contingent displays 14 .…”

Multifocal displays: review and prospect

“…Lee et al [94] from Seoul National University proposed the tomographic display [ Fig. 10(d)], featuring a 60 Hz LCD with a fast DMD backlight and a tunable liquid lens.…”

Progresses in the practical metasurface for holography and lens

“…Recently, the commercial market for head mounting type devices such as augmented reality (AR) and virtual reality (VR) is increasing, and as the importance of lightness and compactness of devices such as cameras and optical sensors used in smart phones emerges, a demand for a new platform is increasing [99][100][101]. Through the Fresnel lens, or Echelette-type lens, the thickness of the lens can be reduced, but in spite of their potential, such a lens has problems such as the reduction of light efficiency compared with shadow effects [6,102].…”