Projection television display tube and device having interferenc

Details Projection television display tube and device having interferenc Projection television display tube and device having interferenc

1985-11-04

1987-07-28

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Screen

313112, 358237, 358253, H01J 2989

Patent

active

046833986

ABSTRACT:
A projection television display tube comprising in an evacuated envelope a display screen on the convexly curved inside of a display window in the wall of the envelope, which display screen comprises a layer of luminescent material and a multilayer interference filter between said material layer and the display window, the filter comprising a number of layers which are alternately high refractive index (H) and low refractive index (L). The filter is composed of at least 6 layers, each having an optical thickness nd, wherein n is the refractive index of the material of the layer and d is the thickness, which optical thickness is between 0.2.lambda..sub.f and 0.3.lambda..sub.f, wherein .lambda..sub.f is equal to p x .lambda., wherein .lambda. is the desired central wavelength which is selected from the spectrum emitted by the luminescent material and p is a number between 1.18 and 1.32.

REFERENCES:
patent: 4365183 (1982-12-01), Kloss

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