Varifocal Occlusion for Optical See-Through Head-Mounted Displays using a Slide Occlusion Mask

Can Retinal Projection Displays Improve Spatial Perception in Augmented Reality?

“…To tackle this issue, new AR displays are emerging. Some can change their focal distance to provide a proper accommodation cue [1,10], and even to provide varifocal occlusion [15]. However, such devices are still prototypes and need further development to be used as "all-in-one," compact and wearable, AR headsets.…”

40‐2: Demonstration of a Novel Single‐Layer Double‐Pass Optical Architecture for a Pupil‐Matched Occlusion‐Capable Optical See‐Through Head‐Mounted Display

“…Again the significance of the result is that correct occlusion relationships are created and used to give an unparalleled sense of depth to a virtual image in an OST-HMD. Fig 4(b) demonstrates significant improvements of our newly proposed OCOST-HMD architecture in terms of system specification such as FOV and resolution, optical performance, dynamic range of the real and virtual content, , form factor, and viewpoint perspective, as compared to previous works [2][3][4][5][6][7][8][9][10][11][12].…”

“…Un-edited AR view captured by a camera through a typical OST-HMD that lacks occlusion capability Recently there have been several different attempted solutions to achieve mutual occlusion in an OST-HMD. These attempts can be broken down into two clear categories: direct ray blocking occlusion, which involves the selective blocking of rays from a see-through scene without focusing them [3][4][5] and per-pixel modulation occlusion, which requires an objective optics to focus the see-through view at an intermediate image plane to selectively modulate the real scene pixel by pixel through an occlusion mask [6][7][8][9][10][11][12]. While both occlusion methods have their unique advantages, per-pixel modulation occlusion tends to be preferred when it comes to environment versatility, light efficiency, diffraction artifacts and accuracy of the occlusion mask(s).…”

Occlusion-capable optical-see-through near-eye display using a single digital micromirror device

“…The contrast and visibility of displayed virtual images are also reduced significantly without occlusion, especially in bright ambient light conditions. Several works have been reported for occlusion-capable OST NEDs [1][2][3][4][5][6][7][8][9][10]. Typical architectures form a conjugate image of the real scene onto an SLM for masking, and a second SLM forms the virtual images to be displayed.…”

“…The two SLMs are then added by an optical combiner before projection into the observer's eye. After the preliminary work of Kiyokawa et al [1], various implementations, including the use of a freeform prism [2], a compact package using stock lenses [3] or a double-pass configuration [4], the use of an x -prism [5], and mechanical sliding of the masking SLM for varifocal occlusion [6] have been reported. Direct placement of the masking SLM in front of the eye has also been proposed [7] with the use of a microlens array [8] or computational stacked display configuration [9] for three-dimensional (3D) occlusion.…”