3D伪全息投影仪的研制

Design of 3D Pseudo Hologram Projector

摘要: 3D伪全息投影是一种较为广泛运用的全息显示技术。本文利用单路信号LED显示屏投影三维投影源动画至正四棱锥形的PVC透明片中，由光学折反射原理在正四棱锥中呈现出虚拟的三维动画幻象。采用动画建模软件与视频处理软件设计了具有灯光音效及故事情节的视频动画，制作了边长68.5 mm，高50 mm的正四棱锥形的成像空间，完成了尺寸为135 mm × 100 mm × 55 mm的投影仪装置的研制。对幻象的成像效果及可视范围进行了实验，结果得到当LED显示屏光照度为632Lux，水平观影角度在60˚至120˚之间时可观察到动态对比度为1606:1的清晰可控的三维动画投影。该装置成本低、体积小，具有极强的空间感、透视感和科技感。

Abstract: 3D pseudo-holographic projection is a widely used holographic display technology. In this paper, the single-signal LED display is used to project the three-dimensional projection source animation into a regular quadrangular pyramid-shaped transparent PVC sheet. The principle of optical cata-dioptric reflection presents a virtual three-dimensional animated illusion in a regular quadrangular pyramid. The video animation with lighting effects and storylines was designed using animation modeling software and video processing software. The image space of 68.5 mm, high 50 mm and four-pyramid is made, and the development of a projector device with a size of 135 mm × 100 mm × 55 mm is completed. The imaging effect and visibility range of the phantom were experimentation. It was found that when the LED display light intensity was 632Lux and the horizontal viewing angle was between 60 degrees and 120 degrees, a clear and controllable 3D animation projection with dynamic contrast of 1606:1 could be observed. The device has a low cost and small size, and has a strong sense of space, perspective and technology.