The ways to realize electronic paper technology mainly include cholesteric liquid crystal display technology, electrophoretic display technology (EPD) and electrowetting display technology. Among them, electrophoresis display technology is the most promising technology approach. This technology was first mastered by E Ink in the United States, but in fact many international giants have contributed to this technology, including Xerox, Lucent, Philips, Epson, etc. More mature companies that have mastered this technology include US E Ink Company, SiPix Company, Guangzhou Aoyi Technology Company, Epson, Bridgestone and so on. These companies have their own core patented technologies; Guangzhou Aoyi Technology Co., Ltd. is also actively bringing electronic paper technology to the market. Domestic institutions that carry out e-paper research also include Sun Yat-sen University, Northwestern Polytechnical University, Zhejiang University, and Tsinghua University.