Phase-only Liquid Crystal Spatial Light Modulator Design And Application Research

Nowadays with the rapid development of the information high-technology, traditio-nal encryption technology is facing more and more challenges. Photoelectric encryption system based on the random phase encoding technology, for its outstanding security characteristic it has got more and more extensive attention. Phase-only Spatial Light Modulator-SLM is an important display device in joint transform correlator encryption and decryption system, the thesis have done meticulous research and design of SLM. First we designed and improved the Single Chip Microcomputer—SCM drive circuit, then put forward a design scheme which the SLM were driven by FPGA.(1) The thesis put forward a Chaos key design method which is a realizable way for "one-time pad" in some sense, this method based on digital chaos theory, random phase anti-counterfeiting mask exposure coding method and real-time photoelectric verification system design. By using the phase-only spatial light modulator as the key carrier, we put forward a fingerprint verification system. And the discussed the random phase anti-counterfeiting mask exposure coding method, we explained the principle of POCS algorithm and done the computer simulation by using matlab GUI interface we write.(2) The thesis choose the SONY LCX026BLT LCD screen, designed and improved the SCM drive circuit, completed the design, welding and debugging of the drive circuit and the independent power conversion module. At the end the SLM can work normally.(3) Analyzed the possibility of FPGA work as the main chip of the SLM driving circuit, come up with the whole drive circuit design diagram,eventually completed the schematic diagram and the two layer PCB design of the driving circuit.