Improved electroholographic display using liquid crystal devices to shorten the viewing distance with both‐eye observation
Improved electroholographic display using liquid crystal devices to shorten the viewing distance with both‐eye observation
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使用液晶器件改进电子全息显示，缩短双眼观察的观看距离
DOI：
10.1117/1.600757
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发表时间：
1996
影响因子：
1.3
通讯作者：
T. Honda
中科院分区：
文献类型：
--
作者：
N. Fukaya;K. Maeno;Koki Sato;T. Honda
我们正在建构一个以液晶显示器作为空间光调变器的电子全息显示系统，以控制雷射光的波阵面来重建三维影像。一个广泛的水平观看区是由五个特殊的液晶显示器设置在一个连续的半反射镜。然而，观看距离仍然相当长，并且该距离降低了图像深度的感知。因此，我们建议在重建图像的中心设置一个场透镜，以缩短观察距离。由于重建的3-D图像变得相当失真的使用场透镜，我们提出了预失真补偿。假设每个LCD具有3200（H）X 960（V）像素，像素间距为28（H）X 56（V）µm。虽然，这种液晶显示器仍在试制中，我们已经确认了重建图像，取代液晶显示器与计算机生成的全息图（CGH）记录到五个摄影胶片具有相同的规格作为真实的液晶显示器。通过这种方式，我们验证了仅具有离轴水平视差的重建图像[50（W）X 50（D）X 100（H）mm]。该图像可以用双眼在900 mm的距离处观察到，并且我们可以充分地感知图像深度。
We are constructing an electroholographic display system using liquid crystal devices (LCDs) as spatial light modulators to control the wavefront of laser light for reconstructing 3-D images. A wide horizontal viewing zone is secured with five special LCDs set up in a continuous series by a half mirror. The viewing distance is still considerably long, however, and this distance reduces the perception of image depth. Thus, we suggest setting a field lens at the center of the reconstructed image to shorten the viewing distance. Since the reconstructed 3-D image becomes considerably distorted by the use of a field lens, we propose predistortion to compensate. Each LCD is assumed to have 3200 (H) X 960 (V) pixels with 28 (H) X 56 (V) µm pixel pitch. Although, this LCD is still in trial production, we have confirmed the reconstructed image by replacing the LCDs with computer-generated holograms (CGHs) recorded to five photographic films having the same specifications as real LCDs. In this way, we verified the reconstructed image [50 (W) X 50 (D) X 100 (H) mm] with off-axis, horizontal parallax only. This image can be observed with both eyes at a distance of 900 mm, and we can perceive the image depth sufficiently.