The Research Of Stereoscopic LED Display System

In recent years, with the widespread of information technology, the traditional two-dimensional display technology has been gradually failed to meet the demands of the public. Whereas, focus comes to be attracted on the three-dimensional (3D) display and it has been a hot research direction in the display field. Besides, LED has been widely used in the outdoor display nowadays. Therefore, the application of 3D technology to the traditional LED display will not only take the advantages of the high brightness, large viewing angle and long longevity of the LED display, but it will also make the outdoor 3D display come true. This paper is focused on the realization of stereoscopic LED display including the design of the parallax barrier, hardware and software of the system.According to the problems that the LED units on the LED display panel are distorted and uneven which have led to the difficulty for traditional parallax barrier to align at the display panel, this paper presents a design of two-sided parallax barrier, which consists of a back barrier, a front barrier and a transparent base plate. The back barrier ensures that the horizontal and vertical direction of the luminous center of every pixel in LED is consistent with each other. The front barrier is used to separate lights. The two-sided parallax has effectively avoided serious 3D crosstalk and solved the problems mentioned above.The paper has designed and realized the hardware and software of the stereoscopic LED display. ARM and FPGA is adopted in the hardware design. ARM provides the 3D video source to FPGA and FPGA is responsible for the storage control of the data and gray-scale control. The software system is achieved by the combination of ARM and FPGA. The ARM platform is composed of Boot Loader, Linux kernel, driving program of LCD device and Qtopia graphical user interface. The FPGA part is separated into 3D data control module and driving module. Each module, which is further separated into several sub-modules, is described by utilizing the Verilog HDL. QuartusII 9.0 is adopted to compile, simulate and debug the program. In this system, through using ARM embedded system instead of traditional PC to provide the 3D video source will not only reduce the cost, but it is also more feasible and flexible. The programmable feature of the FPGA will facilitate the system to be configured, updated and upgraded in time.The paper has finally realized the stereoscopic LED display system based on two-sided parallax barrier with the resolution of 256×128 and two viewpoints. On the base of that, the design is also successfully applied to LED display with the resolution of 1366×768 and the system could show satisfying 3D display effect with five viewpoints. The paper is significant to the commercialization of the stereoscopic LED display.