摘要:利用E-Ink技术类纸显示、无辐射、功耗低等特点,设计并实现一种环保节能的基于类纸屏幕广播的课堂教学系统.针对TCP协议开销较大、耗时长的问题,设计一种以UDP广播为主,辅以反馈和TCP传输的无线传输方法,通过对屏幕的即时截图将教师演示的课件内容以图片的形式即时传输并显示在学生手中具有E-Ink屏幕的电子阅读器设备上,从而实现课件的同步分阅.最后通过采集实验数据对该系统进行了性能分析,包括终端接收成功率、广播次数、数据包大小等.结果表明采用该无线传输方法的系统具有较高可行性.%Taking advantage of E-Ink technologies such as paper-like display, no radiation and low power consumption, the paper designs and implements an environment protective and energy preservative, paper-like screen broadcasting based classroom teaching system. To overcome the disadvantages of TCP protocol such as high cost and time consuming, the paper designs a wireless transmission approach which depends mainly on UDP broadcasting while supplemented by feedbacks and TCP transmission, through instant screen snatch, transmits in the form of images, the courseware contents that the teacher demonstrates, and displays them on electronic readable devices, which are held in students' hands, each equipped with an E-lnk screen. As a result the synchronous respective-reading of courseware is realized. Finally by collecting experimental data the performance of the system is analyzed, including the success rate of terminal receipt, broadcasting frequency, packet size and so on. The result validates the high feasibility of the system on account of the wireless transmission approach.