DMD-based autostereoscopic display system for 3D interaction

Y. Zhang, A.R.L. Travis
2008 Electronics Letters  
A novel approach to implement the multiview autostereoscopic display system is presented. This implementation brings together a high frame rate digital micro-mirror device (DMD) projector, an active shutter, and an optical wedge. It facilitates the modulation of the DMD to achieve extra high frame rate with a trade-off in greyscale resolution. The results have the great potential for commercialising the autostereoscopic display system. Introduction: Autostereoscopic display systems provide the
more » ... ystems provide the viewers with 3D perception of images without the need of wearing either a pair of special glasses or other headsets. Two common approaches are available to realise an autostereoscopic display system: spatial-multiplexing and time-multiplexing [1 -4]. Cambridge University has been developing an autostereoscopic display system by using the time-multiplexing approach for about 20 years, and has achieved great success [3 -5]. However, owing to the lack of a high bandwidth display device, Cambridge's previous system adopted the viewsequential approach to encode depth information, and used fast cathode ray tubes (CRTs) to generate pixel information. On the basis of the success of Cambridge's 3D display system, and the fast advancement of spatial light modulator (SLM) technology, especially DMD technology [6], over the years, this Letter introduces our innovation of the existing system by using DMDs and a decoupling diffuser to replace the CRTs. It is well known that the high pixel bandwidth is of critical importance to a 3D display system, since it almost requires orders of magnitude more information than its 2D counterpart [1, 2]. A CRT is an analogue device, bulky and difficult to run; while a DMD is a binary device with the features of high speed, high precision and broadband capacity, allowing for encoding the desirable quantity of 3D information and realising the time-multiplexing system much easier [7]. Principle and system components: This system uses a time-multiplexing approach. It consists of three major parts (see Fig. 1 ): a high frame rate DMD projector, an active shutter, and an optical wedge [8] . Three DMDs are utilised, one for each colour: red, green, and blue (RGB). An optical wedge is brought in, making the whole display system in a flat panel form. The following sections firstly describe the
doi:10.1049/el:20082427 fatcat:u2yfveebmbgjnhfk26cocxd3sa