Cathode ray tube phosphor layers.

摘要

A cathode ray tube (C.R.T.) phosphor is formed by a fibre optic plate (4) comprising single crystal fibres (7) of a phosphor material such as Y3Al5O12 doped with Tb, Eu, or Ce, held in a matrix (8) e.g. of aluminium, epoxy resin, or a glass. The layer (4) may be mounted inside a cathode ray tube envelope (1) or form its front face. The fibres (7) may be doped with different dopant to give a multi colour display. For example the fibres may be arranged in groups of threes each group having a fibre doped to give emissions of red, blue, and green. One use of the invention in high brightness displays such as aircraft head up displays.