This paper designs a binocular three-dimensional (3D) display based on pixelated nanograting matrix. A view modulator covered with the nanograting matrix forms a specific view distribution according to the binocular position in space. Furthermore, we introduce the concept of super multi-view display to resolve the vergence-accommodation conflict (VAC). In the experiment, we combine the LCD screen and the view modulator pixel by pixel. Then a binocular super multi-view 3D display prototype is constructed with collimation backlight. The experiment demonstrates that this scheme can present stereoscopic images with correct depth cues.
In this paper, a kind of transparent 3D static display consisting of a flat glass waveguide and single layer gratings is proposed. The gratings are shaped into various patterns and designed pixel by pixel to provide correct parallax images. Incident light from the edge of the flat glass can only be extracted from the patterned area and projected to designed views. The prototype shows the advantage of wide field of view (60°), small angular separation (5°) and high transmission (<60%). Virtual 3D objects blend well with the real scene. Potential applications include window display and advertisements
We propose a method for designing diffractive lenses, which is called binary variable slope search (BVSS) algorithm. The diffractive lens designed by this algorithm have a fixed-position focus at several prescribed wavelengths, which we refer to as achromatic diffractive lenses (ADLs). The BVSS algorithm greatly reduces discontinuity in depth of the diffractive microstructure, thus it allows one to consider the technological limitations associated with the fabrication of the diffractive microrelief. As example, we designed an ADL, which can focus five wavelengths at a point to reduce chromatic aberration. The simulation and experimental results show that the deviation between the designed and fabricated profiles amounts to 8%. The obtained results confirm the efficiency of the proposed method in practical applications.
The microneedle array (MNA) is a painless, minimally invasive device composed of micrometer-sized and submillimeterheight needles, which is used to deliver drugs or extract signals. In this paper, we can use digital light processing (DLP) 3D printing technology to simply fabricate sharp MNAs (tip radius<6 μm) and good straightness (coefficient of determination R2>0.996) with adjustable size, then PDMS molds can be obtained by replicating MNAs through the soft imprinting process. Further, we proposed a UV imprinting method to produce microneedle molds rapidly and massively, by casting photosensitive resin in PDMS mold to transfer the MNAs microstructure. Based on the dissolvable MNAs fabricated by PDMS molds, we also conducted a skin penetration study to verify the functional capabilities of the MNAs in biomedicine.
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