04804884 is referenced by 24 patents and cites 5 patents.

A projection television system comprising an array of three projection television display tubes (14) luminescing in red, green and blue, a focusing lens (16) associated with each tube and a display screen (12) on which the respective optical images are merged to form a single multicolored image. At least one of the display tubes (14) has a multilayer interference filter (46) between the phosphor (30) and the faceplate (20). In order to imprve the light output at the corners of the display screen (12), the cut-off angle of the first filter layers is varied between the center and the corners thereof, for example by increasing the optical thickness of the filter layers relative to the center.

Title
Display tube having improved brightness distribution
Application Number
2/645922
Publication Number
4804884
Application Date
May 1, 1987
Publication Date
February 14, 1989
Inventor
John A Clarke
Carshalton
GB
Johannes H M Spruit
Eindhoven
NL
Leendert Vriens
Eindhoven
NL
Agent
F Brice Faller
Assignee
U S Philips Corporation
NY, US
IPC
H01J 29/89
H01J 29/28
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