Cathode-ray tube having an apertured mask

Details Cathode-ray tube having an apertured mask Cathode-ray tube having an apertured mask

H - Electricity

01

J

313/35.155, 313/

H01J 29/30 (2006.01) H01J 29/07 (2006.01) H01J 29/32 (2006.01)

Patent

CA 1076636

Abstract A cathode-ray tube with either a positive- or a netative-tolerance viewing-screen structure comprises an evacuated envelope, a luminescent viewing screen within the envelope and means for exciting the screen to luminescence. The tube includes means, such as an apertured mask or a light-absorbing matrix, for selectively defining to the viewer an array of discrete excited areas in the screen which are noncircularly graded in size, with the largest areas in the central portion of the screen and the smallest areas in the peripheral portions of the screen. -1-

147518

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