Acid resistingit is administered to the surface of CRT display (non glare) one of processing.The vacuume vaporating the magnesium fluoride and the like to the display surface, the system which makes the transparent thin film, denies the plain air due to the illumination and the like making use of the interference of light. Scantness of the curtain has become 1/4 of wave length of the light. When plain air does incidence, the light which is reflected with the surface of the membrane and, transmitting, it divides into the light which it reflects with the inner part, but as for both because 1/2 wave length it reaches the antiphase which slips, to deny, reflected light stops being conspicuous.