Işığı Verimli Kullanan ve Foveated Gözlük Mimarileri

Augmented reality (AR) displays in eyeglass form are seen as the future of information displays. The image generation unit within the AR glasses, which is called a spatial light modulator (SLM), and optical architectures are among the major limitations of current AR displays. For the ultimate AR experience, the viewer should see high resolution images that cover a large portion of their viewing angle. With the current SLM technology either large viewing angle with low resolution images or high resolution images with small viewing angle can be provided. This trade-off is one of the key limitations of AR glass technology. Considering that the human eye has high resolution only at its central vision and the rest of the view gradually seems blurred towards the periphery, more efficient displays can be designed by mimicking the human eye. These architectures that show sharp images only to the central vision and low resolution images to the rest of the viewing angle are known as foveated displays in the literature. Foveated displays require eye tracking and special optical architectures that can change the position of the high resolution image within the larger viewing angle of the user, depending on the user's viewing direction. In this thesis, we present three different foveated AR glass architectures and a fast, reliable and computationally light pupil tracker algorithm that we developed for foveated display architectures. In our pinhole display we extended the eyebox using an array of light sources (LEDs), which are individually turned-on based on the pupil position in real-time. We demonstrated a 37° circular field-of-view (FOV) with a luminance of 360 cd/m2 using an LED with only 0.42 lumen output. We achieved an extended eyebox of 14x10 mm in size with 1 mm static eyebox per LED and the static eyeboxes are spaced 2 mm apart. The resulting display is super light-efficient as most of the LED light is captured by the eye. In our holographic display with rotating beam splitters, a static 7x4° instantaneous FOV is mechanically steered in sync with the rotations of the eye, so that the viewer always sees a high resolution image at the central vision. We demonstrated 37x4° extended FOV, which is the first holographic foveated head-worn display that works in closed-loop with a pupil tracker in the literature. In our eye-centric design, we eliminated the moving parts by imaging the SLM to the rotation center of the eye. With this architecture, the SLM automatically follows the central vision by design and the holographic image is projected on to fovea by updating the hologram on the SLM. We demonstrated 28x28° instantaneous FOV, which is extended to 60x40°.