Research On Translational Multi-screen Bitmap Volumetric Display System

Three-Dimensional display technology is classified into three types: stereoscopic display technology which is based on the effect of binocular disparity; holographic display technology which depends on the principle of light-wave interference; and volumetric display technology which relies on the 2-D image slice. The images showed by stereoscopic display technology only have psychological depth perception and cannot provide physical depth perception, so they will discomfort the observers. Holographic display has the most ideal 3-D display effect to reappear objects which already exist in practice. However, there are still many technical obstacles in the display of virtual objects. On the current technology level, volumetric display is the most desirable kind of display technique。This paper, based on the patent of Translational multi-screen bitmap volumetric display method, researches and manufactures Translational Multi-screen Bitmap Volumetric Display System. The main work includes:1,Introduce the principles, the development processes and research status of stereoscopic display, holographic display and volumetric display technology respectively. Point out volumetric display technology is the mainstream of 3-D display technologies, and analyze the advantages and disadvantages of several typical volumetric display systems.2,Illustrate the principle of translational multi-screen bitmap volumetric display system, which is divided into five subsystems---the graphics generation subsystem, the image control subsystem, the step drive subsystem, mechanical scanning subsystem and the optic imaging subsystem. Explain the work principles of these subsystems and their relationships, and describe the image matching relations among them.3,Describe the drive mode and the main design parameters of mechanical scanning subsystem, explain the principle of circular translation which is needed by the optic imaging subsystem, and analyze the force status of imaging screen. Prove optical path, the distance between projector device and imaging screen, is constant. So projector device can project clear 2-D images on the imaging screen. 4,Compare kinds of motor control schemes, based on the system requirements and characteristics, adopt stepper motor open-loop control as the control plan of the step drive subsystem. Use self-made DSP circuit board to achieve stepper motor's real-time control by sending pulse sequence.5,Choose CPLD as the host chip of the image control subsystem. Based on the self-made CPLD circuit board, the functions such as image data transmission, video DAC and VGA timing are realized. 6,Introduce the specific implementation of the drive control and image display, analyze the prototype's experimental results.7,Summarizes the major work. According to the problems which are discovered during the processes of the prototype's production and experiment, propose some suggestions to improve the system.