04683398 is referenced by 29 patents and cites 2 patents.

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.

Title
Projection television display tube and device having interference filter
Application Number
6/794862
Publication Number
4683398
Application Date
November 4, 1985
Publication Date
July 28, 1987
Inventor
Johannes H M Spruit
Eindhoven
NL
John A Clark
Carshalton
GB
Leendert Vriens
Eindhoven
NL
Agent
John C Fox
Assignee
U S Philips Corporation
NY, US
IPC
H01J 29/89
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