In this Letter, we present a display system based on a curved screen and parallax barrier, which provides stereo images with a horizontal field of view of 360° without wearing any eyewear, to achieve an immersive autostereoscopic effect. The display principle and characteristics of this display system are studied theoretically in detail. Three consecutive pixels on a curved screen and parallax barrier form a display unit, which can generate separate viewing zones for the left and right eyes, respectively. Simulation and experimental results show that the non-crosstalk effect can be obtained in the viewing zones, which proves the effectiveness of this display system. This study provides some new ideas for the improvement of the autostereoscopic display and to enable envisioned applications in virtual reality technology.

在车载、舰载等运动载体或单兵警戒值守等狭窄空间，传统显示方法难以兼顾显示视场与显示分辨率。针对该问题，本文研究了一种基于变形目镜的全景/周视成像技术与系统。系统采用3路低照度摄像机+4 mm焦距镜头，构成150°左右的全景成像视场，基于FPGA处理平台完成全景图像解析、拼接、校正和显示等算法，实现视频图像大视场拼接与1/3缩放实时显示；由OLED微显示器、变形目镜组和大目镜组成的显示系统使视频图像横向扩大3倍，实时显示全景高分辨动态场景图像。实验系统对全景成像显示技术进行了验证，在军用和民用领域具有广泛的应用前景。

In this Letter, we present an electrically tunable holographic waveguide display (HWD) based on two slanted holographic polymer dispersed liquid crystal (HPDLC) gratings. Experimental results show that a see-through effect is obtained in the HWD that both the display light from HWD and the ambient light can be clearly seen simultaneously. By applying an external electric field, the output intensity of the display light can be modulated, which is attributed to the field-induced rotation of the liquid crystal molecules in the two HPDLC gratings. We also show that this electrically tunable performance enables the HWD to adapt to different ambient light conditions. This study provides some ideas towards the development of HWD and its application in augmented reality.