Deng Huan, Li Qiang, He Wei, Li Xiaowei, Ren Hui, Chen Cong
Opt Express. 2020 Aug 31;28(18):26385-26394. doi: 10.1364/OE.402468.
Two-dimensional (2D)/three-dimensional (3D) convertible or mixed display is one of the most important factors for the fast penetration of 3D display into the display market. In this paper, we propose a 2D/3D mixed frontal projection system that mainly contains a liquid crystal micro-lens array (LCMLA) and a quarter-wave retarding film with pinholes (QWRF-P). The LCMLA exhibits the focusing effect or no optical effect depending on the polarization direction of the incident lights. The forward incident lights pass through the LCMLA without any bending. After passing through the QWRF-P twice, half of the backward lights change the polarization direction with 90°, and the other half remains. Using our designed system, different display modes, including 2D display, 3D display, and 2D/3D mixed display, can be realized. The unique feature of the proposed 2D/3D mixed frontal projection system is that it can switch the display modes by simply changing the image sources without the need of any active optical devices. Moreover, the proposed system is compact, simple and space-efficient, which is suitable for the application in glassless 3D cinema and home 3D theatre.
二维（2D）/三维（3D）可转换或混合显示是3D显示快速渗透到显示市场的最重要因素之一。在本文中，我们提出了一种2D/3D混合前投影系统，该系统主要包含一个液晶微透镜阵列（LCMLA）和一个带针孔的四分之一波延迟膜（QWRF-P）。LCMLA根据入射光的偏振方向呈现聚焦效果或无光学效果。正向入射光穿过LCMLA时不会发生任何弯曲。在两次穿过QWRF-P后，一半的反向光偏振方向改变90°，另一半保持不变。使用我们设计的系统，可以实现不同的显示模式，包括2D显示、3D显示和2D/3D混合显示。所提出的2D/3D混合前投影系统的独特之处在于，它可以通过简单地改变图像源来切换显示模式，而无需任何有源光学器件。此外，所提出的系统紧凑、简单且节省空间，适用于无眼镜3D影院和家庭3D影院应用。
