Since the advent of electronic devices such as smartphones and tablets in 2007, researchers have sought the next generation of transformative technologies. 3D display without glasses is one of the technologies that will redefine wearable electronics. However, limited by display panel resolution, spatial resolution, angular resolution, and viewing angle have become critical tradeoffs in 3D displays.
In a new article published in Light Science & Application, Prof. Linsen Chen, Prof. Wen Qiao and their colleagues at the University of Soochow, China, proposed a general approach to 3D display without glasses, through which spatially variable information is projected onto the observation region. Densely packed views are laid out in the center, while sparse views are distributed around the periphery. To manipulate the view distribution at scale, they devised a feasible strategy based on a view modulator completely covered with a 2D metagrating complex (2DMC). More interestingly, they developed a flexible interference lithography (IL) system to allow fabrication of the view modulator with over 1,000,000 2D meta-arrays pixelated over 9 inches in size. With total display information of less than 4K, a full-color static or video 3D display with an unprecedented 160 ° Field of View (FOV) is demonstrated. The proposed 3D display system has a slim form factor for potential applications in portable electronic devices.
The proposed foveal 3D display is centered around a large-scale 2D metagrator complex (2DMC), which serves as a view modulator. 2DMCs can be manipulated to generate the desired radiation patterns applied in different scenarios. For example, dot-shaped views provide the highest density of information. Vertically oriented line-shaped views reduce the information density in the vertical direction while maintaining the information density in the horizontal direction, etc. These scientists summarize the operating principle of their 3D display system:
“In previous studies, a constant density of information was provided in the viewing angle by views with the same distribution pattern. On the other hand, we offer a 3D display with a spatially varying information density by precisely manipulating the view distribution in a hybrid point / line / rectangle form. As a result, the information density will be modulated as in the foveal vision of vertebrate eyes. “
“The large-scale 2D meta-scraping complex designed has three objectives: (1) to vary the angular separation of views in different regions; (2) to adapt the illumination model of each view to eliminate overlap between views to avoid crosstalk; (3) to avoid gaps between views to ensure a smooth transition in the field of view. they added.
“The demonstrated spatial variant information density 3D display opens up a new avenue for glasses-less 3D displays by addressing the critical trade-off between spatial resolution, angular resolution and viewing angle. We anticipate that the FOV ultra-wide foveal 3D display will be used in commercial applications such as consumer electronics. Scientists predict.
Light science and applications
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