场序彩色视频控制系统

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。     

Low power design of a field sequential color LCoS chip

The low power design of a field sequential color （FSC） liquid crystal on silicon （LCoS） chip for near-to-eye application is presented in this paper. Dual power supplies are used in the design, that is, the supply for part of driving circuits is 3.3 V, and the one for the active matrix is 5.0 V. Serial-to-parallel conversion circuits are adopted to lower the pixel clock frequency of the chip. Also, an idle state is inserted into the pixel clock signal to decrease the switching activity factor to further reduce the power consumption. The LCoS chip is fabricated with 0.35 μm CMOS process and its power consumption is only about 300 mW.