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This document introduce about the physical principles of liquid crystal display (LCD) and plasma display (PDP), discuss the physical imaging principle of the new style display. The LCD works with lower voltage and power, and lower calories radiation, no nuclear radiation, complete flat surface, restore the picture by the square, a strong ability to anti-interference, appearance stability and not gleam. Its researched here in the aspects of the basic principle about display. In addition, While add a little amount gas of Xe in the Ne, the atom of and atom of Xe will collide frequently, and cause the Xe ionized, then release the ultraviolet ray. this ultraviolet ray excite visible light from the fluorescence powder, thus realize the picture rebuild. Choose different fluorescence powder material, we can carry out three primary color rebuild.