Research Of TFT-LCD Overdrive Technique And Its Implementation On FPGA

Nowadays, the display technology has been improved rapidly. For its small size, high resolution, low radiation and power consumption, liquid crystal display has become the mainstream of the display and has a huge development potential and market prospect. Liquid crystal display replacing traditional CRT is the trend of the times.In this paper, the working principle of liquid crystal display is described in detail according to the structure of liquid crystal display. Then we raise motion blur which restricts the further development of liquid crystal displays and explain the origin of motion blur, also we give some methods to solve this problem. We propose to adopt the overdrive technology which is used to improve response time of liquid crystal and introduce several popular overdrive technologies. We chiefly analyse an overdrive algorithm called"approximation approach to time value". The algorithm obtains overdriven pixel value through the look-up table (LUT), which achieve the goal of improving response time of liquid crystal. Additionally its FPGA implementation is presented in this paper.The paper introduces the structure and functional characteristics of Xilinx Spartan-3A FPGA, design flow of FPGA based on ISE. According to study of the structure of liquid crystal display, we develop a FPGA overdrive system which can seamlessly link into liquid crystal display. The whole system is mainly composed of LVDS receive module, FPGA module, SDRAM module, LVDS transmit module, power module, which realize video signal capturing, storing, overdrive processing and display. FPGA module is the core component of the system, which includes memory management module, overdrive value calculate module and SDRAM controller module. This top-down modular design method also can improve compatibility and portability of the system. Finally, the whole system validation is carried out. The result of FPGA synthesis and simulation as well as the data of response time from the experiment confirm that the system can work correctly and reliably. Futhermore, we subjectively evaluate the quality and motion blur of liquid crystal display, then we conclude that the improvement of motion blur is effective and the design is successful.