Directional filter for a display screen, the method for manufacturing same and a display system, a cathode-ray tube in particular, provided with such a filter

摘要: For improving the contrast of information displayed on screen, there is placed in front this latter a filter comprising matrix channels pierced photosensitive glass plate. The plate covered over whole its surface with blackened deposit so as to reduce maximum coefficient reflection. Thus filters can be formed readily request, according direction observation particular, good transmission and improved contrast.