Design And Optimization Of Field-sequential-color Liquid Crystal Display System

At present,the display device realizes color display by three-primary color mixing,and mainly has two methods of space blending and field-sequential color(FSC)mixing.The former divides one pixel into three sub-pixels of red,green and blue,and realizes color display by using the limit of spatial resolution of the human eye.The most widely used liquid crystal display mainly uses space mixing method.Different from space blending,FSC-display can quickly display the information of red,green and blue images on the display screen,and synthesize color images by using the visual temporary characteristics of human eyes.It does not use color filters,thus avoiding the absorption of light by color filters.Since the sub-pixel matrix structure is not required,a high pixel density can be achieved in a unit display area.Southeast University has done a lot of basic research work in the field of sequential color display.This paper designs a FSC-LCD system.Through the cooperation of matrix color backlight and LCD panel with high refresh rate,the system can realize color sequential display without filter,with high light efficiency and high resolution.Specific work includes the following aspects:First of all,the paper completed the design and construction of a FSC-LCD system.The system uses FPGA as the control core,which is mainly divided into two parts: liquid crystal display module and backlight module.The refresh rate of the liquid crystal module is 240 Hz.The original backlight is disassembled,and a 16×9 matrix LED backlight circuit is redesigned to produce a backlit PCB board.Secondly,the paper designs the FPGA logic for the FSC-LCD system,and completes the logic implementation of the video driver module and the backlight module respectively.The driving sequence of 240 Hz is generated by the FPGA,and the four sub-field data collected are sequentially output to the liquid crystal module.The backlight data is hidden in the first line of the video image,and the backlight data is acquired by the FPGA and sent to the backlight system.The color sequential display is completed through the cooperation of the liquid crystal module and the backlight system.Finally,a four-field LPD algorithm is designed based on the characteristics of the system.The algorithm implementation and effect simulation were carried out using MATLAB.The natural image is displayed on the physical platform.The subjective scoring experiment was designed to evaluate the suppression effect of the four-field LPD algorithm on color breakup.It can be seen from the final display effect that the 240 Hz FSC-LCD system designed in this paper successfully realizes the field-sequential display of color images.The four-field LPD algorithm can effectively suppress the color breakup phenomenon of the FSC-display,and the display effect is good.