Research On Display Control Of Silicon Based LED Micro Display

The development of modern display technology is closely related to integrated circuit.At the same time,with the popularization of Internet and intelligent application equipment,people’s demand for high performance information display mode is also gradually strong.How to achieve better display effect in the small size equipment has become one of the key problems to be solved in the current display field.Micro LED display technology has become an effective solution in current display technology.Combined with the current research status at home and abroad,this thesis has fully studied the working principle and driving mode of Micro LED.According to the functional requirements of the project and main technical parameters,the hardware circuit design of silicon LED Micro display system has been completed.Aiming at the influence of power output noise and ripple voltage on transmission signal,a distributed power supply architecture is used to design the power module circuit.To solve the problem of data loss after FPGA power failure,a Flash memory module circuit is designed to ensure that the system can keep valid data when it is powered on again.Based on FPGA development platform,including the logic functional framework design,the division and logic design of functional modules of the display system are completed by topdown design.The image data cache module is designed to solve the problem of clock synchronization of data transmission between modules.The data processing module is designed to realize the processing of image data bit width and the cycle of 8 row clearing sub-field cycles under different frame display cycles.Use ISE and Modelsim software cosimulation to verify the correctness of each function module designed.Finally,based on the designed functional modules,the display driver of the display system is realized through board-level debugging,which verifies the feasibility of the design of the display system.In this thesis,the design of the resolution of 1280×720 silicon-based LED micro display system can achieve 256 gray level brightness display.Aiming at the nonlinear problem of human eyes’ perception of brightness,the nonlinear correction technology adapted to human eyes’ perception characteristics is introduced,and 256 gray levels are remapped by MATLAB.The results show that the brightness jump phenomenon of low gray order can be eliminated when the compensation coefficient is 0.6 and the correction coefficient is 2.2.Considering the influence of traditional PWM dimming algorithm on gray brightness of display screen,the proposed PWM average split dimming algorithm increases the visual refresh frequency of display screen from 276Hz to 1116Hz.Through the debugging comparison of the display screen,the results show that the PWM average division dimming algorithm can obviously improve the uneven display effect caused by high level centralized output.