| In recent years, the near-eye displays have more and more widely used in military applications, industrial production, three dimensional displays and video games, such as the Oculus Rift manufactured by the Oculus company and Google Glass fabricated by the Google corporation. These wearable devices have caused extensive attention in the field of consumption. In combination with three dimensional displays technology, the near-eye three dimensional displays will greatly improve the user’s visual experience and rich people’s daily life.However, in the traditional wearable near-eye three dimensional displays field, the holographic optical element and freeform surface element are utilized frequently, at the same time also other optical components such as reflection, refraction and diffraction devices are introduced. These methods increase the complexity of the optical system and reduce the portable display device undoubtedly.Therefore, Hironobu Gotoda came up with a new design according to calculations of a multilayer LCDs scheme, which used a stack of spatial light modulators to achieve different perspective images and get accurate motion parallax. At the same time, Andrew Maimone fabricated an augmented reality glasses with multilayer structure of liquid crystal display. In combination with nonnegative matrix decomposition algorithm, the author claimed that the best reconstructed light field can be optimized.Based on predecessors’ study of multi-layer LCDs near-eye displays technology, this paper expounds on the layers of liquid crystal display technology and the basic principle of near-eye displays. Combined with the light and multilayer pixels of one-to-one correspondence relationship, finally we introduced how to utilize the high dimensional linear least squares algorithm and nonnegative matrix decomposition algorithm to calculate the multilayer transmittance of LCDs pixels and accomplish the three dimensional scene reconstruction.What’s more, an array of pinhole cameras were set up in the 3ds max software to obtain the target light field, and a number of viewpoints were utilized in the OpenGL to acquire the light field at the same time. Experimental results show the same light field is captured with these two methods, and the OpenGL method has a higher real-time and a better commonality.Depending on human visual characteristics, the paper developed an optimization algorithm enhancing performance of the near-eye light field displays based on multilayer LCDs. The limiting angle of resolution under different field of view can be derived by analyzing the corresponding MTF curves, the analysis of weight optimization for near-eye light field displays indicates a better reconstructed light field and better information utilization.At the end of the paper, we summarized the bottlenecks in near-eye three dimensional displays and a few possible solutions are proposed. |
