场序彩色视频控制系统

Video Controller System by Using Field Sequential Color

采用时序彩色法实现彩色显示,在液晶显示技术中具有良好的发展前景,具有成本低、分辨率高、彩色效果好等优点。文章主要介绍了一套针对南开大学研制的LCoS芯片的场序彩色视频控制系统,该系统采用场序彩色模式,经过实验调试后,最终实现了LCoS芯片的彩色视频显示。在设计的系统中视频数据采用并行的输出方式,降低了整个控制系统的工作频率。系统利用两组外部SRAM对帧数据进行缓存,采用乒乓操作来实现视频的实时连续显示。整个控制系统的核心部分采用一片FPGA来实现,文章详细介绍了FPGA内部数据流处理的算法实现:FPGA采用3组移位寄存器对数据进行动态缓存,实现了串行-并行的数据转换,并将同时输入的红、绿、蓝视频数据转换为红、绿、蓝子场数据;并且充分利用FP-GA内部RAM作为缓存,完成了图像的插值处理,以满足LCoS扫描显示的要求。最后介绍了在时序彩色LCoS显示中出现的问题和难点。

There is a great developing potential by using sequential color method to achieve color display. It has many good performances of low cost, high resolution and color effect. This paper introduces the field sequential color video controller for LCoS produced by Nankai University. Field sequential color （FSC） is used in this system to achieve the color display. And by using experiment and debug, the color display of the LCoS chip is realized. In this system, the video data are output in parallel, which reduces the work frequency of the whole controller system. The system makes use of two group of outer SRAM to buffer the frame data, and uses ping-pong operation of the SRAM to achieve the video display in series. The core of the controller is realized by a piece of FPGA. This paper discusses the method to achieve the data flow processing in the FPGA in detail. The FPGA adopts three shift registers, and the data are buffered in dynamic. The shift registers complete the serial-in-parallel-out data transform,which transform the RGB signal data into the RGB field signal data separately; By using the inner RAM of the FPGA, the interpolation operation of the image is achieved, which satisfies the requirement of the LCoS display. At last, some problems in the LCoS color display by FSC is introduced.