Research And Development Of Anti-peeping Display System

A variety of emerging technologies are widely applied to electronic products in recent years.For example, more and more phones with T9buttons are placed by smartphones with largetouch-screen. The resolution is becoming higher and higher with the changing of input mode andscreen size. Not to mention that Retina display has become the standard configuration of theflagship. Besides, the sensor of gravity, light and distance makes human-computer interactionmore flexible and intelligent. But one thing has not been changed: the screen is the only channelfor users to get information from electronic products. Even for the wearable device, which willbecome the mainstream in the future, it is necessary to be connected with our mobile phones orcomputers in the present stage, when we want to set them or read the record from them.On one hand, the screen display is still the domination of information output. On the otherhand, with the development of the Internet and online banking, more and more privateinformation of people needs to be dealt with by the computer. Therefore, the research ofanti-peeping display system is important and practical.The main research of this paper is as follows:Firstly, this paper analyzes the research background and significance of the anti-peepingdisplay system by summarizing the research status of anti-peeping display technology, SLI andCrossFire at home and abroad. Based on the persistence of vision of human eyes, a designscheme, which can absolutely solve the problem of anti-peeping by Field Programmable GateArray and digital video display technology, is put forward.Secondly, a detailed study of DVI and HOMI, two kinds of digital video interfacesspecification, has been made. Also an explanation of the physical properties and coding mode ofthe involved TMDS Link is issued, among which the description of different periods of HDMIinterface in the process of data transmission and the coding mode used in all periods is given.This paper also studies the working principle and developing process of FPGA chips.Thirdly, hardware circuit is designed in accordance with the requirements of the system. Inthe first step, the author selects the FPGA chip needed by system to draw buffer circuit of inputand output. Then, the author designs three voltage conversion circuits according to differentvoltages needed by each chip. In the end, two circuit designs of FPGA configuration mode,JTAG and SPI, are put forward.Fourth, software design is made according to the requirements of system. The software isdivided into four modules: data receiving module, clock managing module, parity frameprocessing module and data transmitting module. Every module is described in detail and partsof codes and flow charts of some modules are given. Finally, the synthesis and the behaviorsimulation for the software design are carried on.