Design Of Sub-pixel Sampling Image Display Hardware System

Full color LED display, as a kind of new color array display, has developed rapidly in the stadiums, station's waiting rooms, recording fields with the advantage of wide display dynamic range, bright color and wide angle. On account of the limits of manufacturing cost and production level, it is still very difficult for LED display to achieve the same resolution and sharpness as other flat panel displays. Therefore, how to show high resolution pictures on low resolution displays becomes one of the major research contents in LED display area.Focusing on this problem, image simulation and display hardware platform is designed based on the display characteristics of different sub-pixel sampling modes. Due to the objective conditions, it is difficult to obtain sub-pixel sampling pictures on LED displays. It's more convenient to drive LCD display and imitate LED display. Firstly, real-time display simulation effects that different sub-pixel sampling modes displays are realized on the hardware platform on LCD display. After that, low pass filtering algorithm is adopted to reduced image color error because of sub-pixel sampling. Finally, new standard video which can improve resolution and sharpness is produced from this platform for LED display control system. Main work and results are as follows:1. More effective way to improve resolution can be found based on the understanding of sub-pixel sampling, anti-aliasing low pass filtering algorithm, human visual system and research of LED and LCD display principle.2. To achieve the real-time display simulation, image simulation and display hardware platform based on FPGA is designed. FPGA acts as core processor and SDRAM serves as external memory. Different sub-pixel sampling pictures can be realized on this platform. What's more, it is easy to produce new Standard digital video after sub-pixel sampling and anti-aliasing through DVI digital video interface.3. Different sub-pixel sampling images such as pixel sampling, RGB-trio sampling, RGGB-mosaic sampling, RGB-delta sampling are shown on LCD display. The display effects are the same as on LED display. The anti-aliasing low pass filtering algorithm is used to solve the problems of sub-pixel sampling color error. Different processing images are shown in order to compare the advantages and disadvantages between various sub-pixel sampling images.4. Real-time sub-pixel sampling and anti-aliasing operation are adopted to handle the video signal through DVI interface based on this platform and the above experimental results. New video signal can directly drive LED display control system and improve display quality and resolution.It is shown that the simulation effects of various sub-pixel sampling models and anti-aliasing operation can be conveniently obtained from the image simulation and display hardware platform. And it can also provide new standard digital video signal after sub-pixel sampling and anti-aliasing for LED displays. This platform is beneficial to select more proper LED arrangements and enhances the resolution and picture definition under the condition of not changing physical resolution.