In this article,authors state three technical ideas about external wall exterior insulation including the technical idea which exterior insulation is better than interior insulation, the technical method of gradual change layer by layer and flexible releasing stress, and the structural design of exterior insulation without cavity.

After the brief introduction of OELD about its device structure,work principle and fabrication process,the paper expounds systemically the research progress in the organic luminous materials,OELD display panel and its driving technology.

The development of driving technology urges the stepping motor system to become more widely used.

AC servo heavy duty driving technology is a new dynamical driving technology which develops on the base of common AC servo driving technology in recent years.

On the basis of analyzing the development trend of permanent-magnet AC servo system,the research state of permanent-magnet AC servo system s control strategy,position detection and identification,main circuit, drive technique and communication network technique and so on were focused on.

The cost reduction and high quality picture can be achieved by using various PDP drive techniques.

This article introduced emphatically the control strategy,position detection and identification,drive technique as well as main circuit of permanent magnet Ac servo system.