Contents 1. Introduction
The history of three-dimensional display technology with glasses can be traced back to the early 19th century, including anaglyph glasses, polarized glasses, Pulfrich glasses, shutter glasses and head-mounted display [1]. However, viewers wear these extra-glasses for watching the 3D programs will feel inconvenient and uncomfortable, so that the development of naked-eye 3D display becomes an important issue. The technologies of naked-eye 3D display include the holographic type, volumetric type, time-multiplexed and spatial-multiplexed 3D display … etc, where the spatial-multiplexed 3D display is most and earlier concerned. The spatial-multiplexed methods include parallax barrier type and lenticular array type, but the structure of lenticular array encountered the bottleneck of fabrication, so the modified parallax barrier method has become a more important issue [2]. The principle of parallax barrier method is shown as Fig. 1, the grating can successfully separate the images emitted from the odd pixels and even pixels into the human's left and right eyes, however, the luminance-deficiency problem of traditional parallax barrier structure still exist. A light reused method which can effectively resolve the luminance-deficiency problem is proposed in 2008 [3]. This method can increased luminance value but still less than non-barrier structure of LCD panel. Therefore, we propose the traditional parallax barrier replace with diffractive optical element to achieve the stereoscopy in 2007. This study main is a novel grating structure of diffraction for stereoscopy display. The diffractive optical element (DOE) may substitute for the multi-pieces function of traditional optical component, which can modulate the phase of the incident wave front by surface relief method then rearrange the light field distribution. In fact, the DOE has been applied to many fields, such as beam shaping [5], wavelength division, multi-focusing, but no one discusses about the application to the stereoscopy display. In this study, we use the DOE to control the directions of the emitted lights from RGB sub-pixels, then to achieve the effect of stereoscopy. Parallax Barrier 3D Display
