Design Of Ultra High Definition Laser Display System Based On FPGA

With the quality and standard of people's life getting better and better,the demand for large and high-resolution images is also increasing.Under the same display resolution,compared with other display technologies,projection has more reasonable price and higher mobility convenience.The projection principle of DLP determines that the contrast of the picture it projects is very high,and it has advantages in brightness,resolution and light efficiency.At the same time,the use of laser light source brings revolutionary improvement to the display system.In the display domain,laser is the next generation technology,it has many advantages,such as high brightness,long service life,large color span and environment friendly.LCD,LCOS and other liquid crystal materials are organic substances,which will undergo rapid denaturation under high-intensity laser irradiation,and the service life can not meet the needs of products.Therefore,using DLP technology is the first choice of laser display at this stage.Digital Micromirror Device(DMD)is the core component of DLP technology,which has been monopolized by Texas Instruments(TI).For several years,TI has monopolized the whole system solutions such as DMD,test,driver chip and application,and the interface is not open.In some applications requiring fast response and sensitive fields,its proprietary driver chips have some problems such as high latency,poor universality and low application extensibility.According to the cooperation needs of a company's actual project,this paper designs and implements an ultra-high definition laser display system based on FPGA,which aims to support DMD projection display with multiple resolutions with very low delay,and solve the problems of limited application and high time delay under TI monopoly through autonomous driving and algorithm optimization.The system can drive the DMD with a maximum resolution of 2716 * 1528 to realize the ultra-high definition laser projection display with a resolution of 3840 * 2160.The software and hardware of the system are independently developed and designed.The hardware system adopts sub motherboard architecture,which is composed of a 10 layers 4kdmd driver board and a 10 layers DMD daughter board,including 1647 components,1288 signal networks and 4934 signal connections.In the process of system design,the signal integrity,power integrity and electromagnetic compatibility of high-speed hardware design are guaranteed through theoretical calculation and pre and post simulation.In terms of software,this paper realizes the display driving and video processing of DMD through FPGA programming,combined with more efficient PWM data interleaving algorithm and block reset algorithm.Thus,the delay time of data processing is shortened.The measured delay is 30 ms,which is only 1/4 of the DDP4422 driving scheme of American TI company.The interaction between the system and PC is realized through the upper computer software,which can conveniently adjust the brightness of each color of resolution,double laser light sources and red,green,blue and yellow.The system breaks the monopoly of TI company in the field of 4K DMD display driver,instead of its proprietary driver chips,making the delay lower and the integration higher.Compatible with a variety of front-end video processing and a variety of DMD back-end drivers.The application is unrestricted and more flexible.Compatible with multi-color wheel,multi laser light source and UHP high-pressure mercury lamp,and reserved expansion and interaction interface.It provides a customizable driving platform for major projection manufacturers to choose domestic programs,and provides a low delay solution for some application scenarios requiring extremely high response speed,which has a good application prospect.