Full-color computational holographic near-eye display

Abstract

Near-eye displays (NEDs) are an excellent candidate for the future of augmented reality. Conventional micro-display based NED designs mostly provide stereoscopic 3D experience, which leads to visual discomfort due to vergence-accommodation conflict. Computational holographic near-eye displays (HNEDs) can simultaneously provide wide FOV, retinal resolution, attractive form-factor, and natural depth cues including accommodation. In HNEDs, computer-generated holograms (CGHs) are displayed on a spatial light modulators (SLMs). We propose a CGH computation algorithm that applies to arbitrary paraxial optical architectures; where the SLM illumination beam can be collimated, converging or diverging, and the SLM image as seen by the eye box plane may form at an arbitrary location, and can be virtual or real. Our CGH computation procedure eliminates speckle noise, which is observed in all other laser-based displays, and chromatic aberrations resulting from the light sources and the optics. Our proof-of-concept experiments demonstrate that HNEDs with simple optical architectures can deliver natural 3D images within a wide FOV (70 degrees) at retinal resolution (30 cycles-per-degree), exceeding 4000 resolvable pixels on a line using a printed binary mask. With the advances in SLM technology, HNEDs can realize the ultimate personalized display, meeting the demand of emerging augmented and virtual reality applications.

Foveated near-eye display using computational holography

“…We provided basic proof of concept demonstrations using off-line computed holograms and precise positioning of the camera during recording of the experimental images. Details of real-time pupil tracking 26 , 27 and real time computation of CGH for generic architectures 9 are discussed elsewhere. Fast hologram computation for eye-centric architecture will be the subject of future publications.…”

“…In holographic HWDs, CGHs are typically displayed on phase-only spatial light modulators (SLMs) 8 . The need for relay optics is not present for such displays, since the SLM can be imaged at an arbitrary distance away from the eye 9 .…”

Design and fabrication of freeform holographic optical elements

“…Publication date: December 2020. implement multi-layer displays [Lee et al 2016a]. HOEs are also part of many near-eye display systems, wherein HOEs are used as transparent reflective image combiners [Akşit et al 2017;Jang et al 2018Jang et al , 2017Kazempourradi et al 2019;Maimone et al 2017]. HOEs have also been used in place of waveguides for AR displays [Mukawa et al 2008;Oku et al 2015], as a thin VR display [Maimone and Wang 2020], and as an eye-tracking combiner element that is transparent to visible light, but sensitive to infrared illumination [Liu et al 2018].…”

P‐8.4: Holographic Color Display by Controlling the Spectral Components in A Continuous White Light Source

“…Dynamic holographic 3D display can be realized with computer generated holograms (CGH) [1,2]. Full-color holographic displays can be realized by approaches such as time-multiplexing [3,4], spatial-multiplexing [5,6], frequency-domain multiplexing [7][8][9] and three SLMs based methods [10,11]. Realizing the timemultiplexing color holographic display is straightforward: the use of red, green and blue light sources and a synchronized high speed SLM.…”