Holografik ve foveated göze yakın ekran

Augmented reality (AR) displays are attracting more and more attention due to their potential in industrial, medical and consumer-level applications. The ability of embedding computer-generated information with the physical world seamlessly is unique to AR displays in glass-like form factor, which is the reason why they are considered the next-generation of display devices. Increasing the field-of-view (FOV) while providing viewing comfort and true 3D vision are the most important challenges in state-of-the-art AR display design. Computational holography is the only technology that can offer true 3D with all the required depth cues. Holographic near-eye displays (HNED) can provide continuous depth planes with the correct accommodation for a comfortable 3D experience. Existing approaches for HNEDs have small FOV and exit pupil size, which are limited by the number of pixels on the spatial light modulator. As an example, conventional holographic head-worn display architectures are limited to about 20×10 degrees FOV using a 4K resolution SLM panel and have fixed FOV. Dynamic foveated displays with a steerable FOV across the visual field are desired. Proposed architectures require multiple moving components, which are not practical for head-worn displays due to speed, size, and power requirements. We present a new optical architecture that can overcome those limitations and substantially extend the FOV supported by the SLM. Our architecture automatically follows the gaze of the viewer's pupil without any moving parts. Moreover, it mimics human vision by providing varying resolution across the FOV resulting in better utilization of the available space-bandwidth product of the SLM. We achieved 28×28 degrees instantaneous FOV within an extended FOV of 60×40 degrees using a 4K SLM, effectively providing a total enhancement of >3× in instantaneous FOV area, >10× in extended FOV area. Furthermore, we have developed a novel hologram computation algorithm for the display and developed a software-based hologram correction procedure that can correct for undesired aberrations. Computer-generated holograms were used to provide 3D depth cues such as focus blur within the instantaneous FOV.