【作者】 李志；

【导师】 付红桥；

【作者基本信息】 重庆大学 ， 仪器科学与技术， 2008， 硕士

【摘要】 光栅光调制器是一种基于MEMS技术的光调制器件,可用于数字投影显示。由于对器件的研究尚处于初步阶段,设计一种可用于验证和测试器件的动态显示效果的控制电路系统是课题研究的一个重要组成部分。本文分析了光栅光调制器的投影显示原理,并根据光栅光调制器的灰度实现方法,提出了一种针对无源和有源光栅光调制器阵列(16×16)的动态显示控制系统。该系统可以实现不同效果的单色的灰度等级为16的动态图像的显示。分析和探讨了PC应用程序与USB设备的通信原理,在PC上应用Visual C++语言设计应用软件,产生文字、灰度渐变和绘图效果的动态图像数据,并将其显示在应用程序的界面上,同时通过格式转换、数据打包后将动态图像数据通过USB数据线传输到带有USB控制器的开发板。以Altera公司Cyclone系列的FPGA芯片(EP1C6Q240C8)作为硬件开发平台,使用硬件描述语言Verilog HDL进行FPGA设计,实现了无源和有源光栅光调制器阵列(16×16)的数字控制电路(单色四位二进制灰度值)。该控制电路包括FPGA到USB数据接口模块,桶形移位的位面格式转换模块,双口RAM乒乓操作控制电路、以及用于无源器件的二进制脉宽调制的逐行扫描控制电路和用于有源器件的子场法二进制脉宽调制电路。分析了无源光栅光调制器的交叉效应,针对无源光栅光调制器阵列(16×16)设计了可抑制交叉效应的可调偏压法驱动电路。根据无源光栅光调制器阵列与LED阵列在逐行扫描显示方法及在灰度实现原理的相似性,设计了LED阵列代替无源光栅光调制器阵列的测试电路板,对了整个控制系统进行了实验测试。搭建了光栅光调制器阵列单像素测试平台,对新加工的器件进行了单像素工作电压、吸合电压、方波电压驱动的工作频率进行了测试实验。最后,设计并搭建了光栅光调制器动态投影显示系统试验平台,针对控制系统进行了动态图像的投影显示实验。实验结果表明,该系统运行稳定、可靠,操作方便,为控制和测试光栅光调制器的动态显示提供了有力的技术支持。更多还原

【Abstract】 Grating light modulator is a kind of MEMS-based optical modulator which can be used for digital projection display. Because the technology of device research is still at a preliminary stage, a design of control circuit system is an important part of the research which can be used to verify and test effect of projection display. Projection display principle of grating light modulator is analyzed in this paper. In accordance with the gray levels method of grating light modulator, a display control system for the small (16×16) passive and active grating light modulator array is proposed. The system can be used for displaying different effect monochrome dynamic image,which can reach 16 gray levels.Communication theory between PC application and USB device is analyzed and discussed. The application software is designed on PC using Visual C++ language. It can produce dynamic image data of text, graphics and graded gray,and show that in the application interface. After format conversing, the dynamic image data is packaged and transmitted to the development board, which have a USB controller through a USB cable.The digital control circuit (4 grade monochrome gray) of the passive and active grating light modulator array (16×16) is designed, using the Altera Cyclone FPGA chip (EP1C6Q240C8) as a hardware development platform,and Verilog HDL as hardware description language. The control circuit includes FPGA to USB interface module, barrel shifter format conversion module, dual ports RAM ping-pong operation controller module, binary pulse width modulation control circuit for passive device and binary field pulse width modulation circuit for active device.Cross effect of the passive grating light modulator is analyzed. In view of passive grating light modulator array (16×16), driving circuit of adjustable bias witch can inhibit cross effect is designed. As the display method of line by line scan and the graying principle of passive grating light modulator array with LED array are similar, the testing circuit board of LED array instead of passive grating light modulator array is designed. The entire control system is tested by circuit board of LED array. Test platform for single pixel of the grating light modulator array is established. Testing experiment of single pixel like operating voltage, pull-in voltage and frequency of square wave driving voltage is done. At last, test platform of grating light modulator dynamic projection display system is established. Dynamic image projection display experiment for the control system is done. As the result of the test shows that the system is stable, reliable, and convenient to handle. It provides a strong technical support for testing dynamic display of grating light modulator.更多还原