The time the user experiences VR is often limited by factors such as eye fatigue and dizziness. However, an iOptics laboratory at the University of Illinois at Urbana-Champaign (Intelligent Optics Laboratory) is expected to solve this problem. Liang Gao, an assistant professor of electrical and computer engineering, and Cui, a graduate student, invented a new optical mapping 3D display that makes VR viewing more comfortable. Both researchers are at the Beckman Institute.
According to a report published by two people in Optics Letters, most of the current 3D VR displays are superimposed on two pictures, and the viewers then form 3D scenes in the brain through these pictures. This display can cause eye discomfort. We often refer to it as a vergence-accommodation conflict that can cause eye focus problems (causing visual fatigue, headaches, etc.).
When people are watching objects, the eyes will focus on the objects they are viewing. The pupil of the eye adjusts the focal length based on the distance between the observer and the object. At this time, the visual convergence adjustment is consistent and there will be no conflict. In the 3D rendering scene of the computer, all this changed. The two images that make up the stereoscopic three-dimensional image are displayed on the screen at the same distance. In order to produce 3D effects, the positions of these images are slightly offset. This is different from the usual way of working with the human eye. At this time, the focus of the eye is focused on the screen that is only a few centimeters from the face, but the screen image makes people think that it is in a remote place.
In order to solve this problem Liang Gao and Cui Wei invented an optical mapping near-eye (full three-dimensional) display method. Their method is to split the screen into sub-screens. The spatial multiplexing unit (SMU) can adjust the depth of the sub-panels in the correct way to generate depth perception. Unlike current methods for producing 3D images by using images inexpensively, SMUs can also align the center of the image with the optical path. Afterwards, the images are merged into a seamless image by an optical algorithm.
Liang Gao said: "People have tried a method similar to ours to create multiple plane depths. The difference is that they realize depth perception by quickly changing the image, instead of creating multiple depth images at the same time. The former needs to be in the dynamic range or It's a trade-off in contrast because each image shows a very short time."
Researchers are continuing to study how to increase the efficiency of the display while reducing the weight and size of the device. Liang Gao said: "In the future, we hope to replace the spatial light demodulator with a different optical element, such as a holographic grating. In addition to a smaller volume, the holographic grating is also very power-efficient, which can make our equipment more compact , easier to use in VR and AR heads."
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