Projection television system with display tubes having an...

H - Electricity – 01 – J

Patent

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Details

316/13, 313/35.1

H01J 29/28 (2006.01)

Patent

CA 1291203

ABSTRACT: 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 multicoloured 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 improve the light output at the corners of the display screen (12), the cut-off angle of the filter layers is varied between the centre and the corners thereof, for example by increasing the optical thickness of the filter layers relative to the centre.

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