Simultaneous multi-channel near-eye display: a holographic retinal projection display with large information content

Abstract

Augmented reality (AR) near-eye displays (NEDs) are emerging as the next-generation display platform. The existing AR NED only present one single video channel at a time, same as traditional media such as TVs and smartphones. In this Letter, to the best of our knowledge, we propose for the first time a multi-channel holographic retinal projection display (RPD), which can provide multi-channel image sources simultaneously, thus greatly increasing the information content. Due to the superposition capacity of a hologram, multiple images are projected to different viewpoints simultaneously through multiple spherical wave encoding, so that the viewer can switch among playing channels very fast through eye rotation. A full-color dynamic multi-channel holographic near-eye display is demonstrated in the optical experiment. The proposed method provides a good prospect that the future AR glasses can play dozens of video channels in parallel, and the user can switch among channels freely and efficiently just through a simple eye rotation.

A Depth-Enhanced Holographic Super Multi-View Display Based on Depth Segmentation

“…The image quality was significantly improved when compared with the conventional method. This method can also be extended to color, which requires the recording of information from all three RGB wavelengths into the same channel and the simultaneous use of a tri-color laser [24,44]. In order to quantitatively illustrate the enhancement of the proposed method for achieving multi-depth image quality, we performed PSNR calculations for both the simulation results of this method and the simulation results of the conventional method mentioned in Section 2, as shown in Figure 9.…”

“…The image quality was significantly improved when compared with the conventional method. This method can also be extended to color, which requires the recording of information from all three RGB wavelengths into the same channel and the simultaneous use of a tri-color laser [ 24 , 44 ].…”

“…The image quality was significantly improved when compared with the conventional method. This method can also be extended to color, which requires the recording of information from all three RGB wavelengths into the same channel and the simultaneous use of a tri-color laser [24,44]. The proposed method in this paper is similar to the holographic stereogram (HS) [45][46][47][48], which also uses multi-view images to calculate the hologram.…”

“…While these methods provide good results, they are limited by the limited range of video sources and they are not very efficient. The Maxwellian display [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ] partially alleviates the VAC problem by increasing the depth of field. However, it is unable provide accurate depth cues for monocular vision.…”

Depth-Enhanced Holographic Super Multi-View Maxwellian Display Based on Variable Filter Aperture

“…However, the matched video sources are still hard to access or generate for commercial use due to the large amount of 3D data. Apart from these, the Maxwellian NED is less computationally expensive and relieves the VAC problem by providing an “always in-focus” image, but the monocular depth cues are not recovered [ 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ].…”