Foveated near-eye display using computational holography

Area of Science:

• Optics
• 3D Display Technology
• Human-Computer Interaction

Background:

• Holographic displays offer true 3D with essential depth cues.
• Current holographic head-worn displays (HWDs) are limited by small fields-of-view (FOV) and exit pupil sizes due to spatial light modulator (SLM) constraints.
• Conventional HWDs typically offer a fixed FOV of approximately 20° × 11°.

Purpose of the Study:

• To introduce a new optical architecture for HWDs that overcomes existing FOV and resolution limitations.
• To present a system that enhances the space-bandwidth product utilization of the SLM.
• To achieve a comfortable and immersive 3D experience through continuous depth planes and correct stereoscopic disparity.

Main Methods:

• Developed a novel, partless optical architecture for HWDs.
• Implemented an eye-gaze-tracking mechanism that automatically adjusts the display.
• Incorporated variable resolution across the FOV, mimicking human vision.

Main Results:

• Achieved an instantaneous FOV of 28° × 28° within an extended FOV of 60° × 40° using a 4K SLM.
• Demonstrated experimental results of 20° × 20° instantaneous FOV and 40° × 20° extended FOV.
• Reported over a 3x enhancement in instantaneous FOV area and over a 10x enhancement in extended FOV area and space-bandwidth product.

Conclusions:

• The proposed optical architecture significantly enhances the FOV and space-bandwidth product of holographic head-worn displays.
• The gaze-tracking and variable resolution features offer a more efficient and human-like visual experience.
• This technology represents a substantial advancement in achieving wider and more immersive holographic 3D displays.