Cathode ray tube screen having charge-retaining layer apertured in registration with color elements
AssigneeU.S. Philips Corporation
InventorJan VAN DER Waal
Life of this patent
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Abstract
In a color CRT, the mislanding of electron beams due to thermal effects in the shadow mask is compensated for by means of an electron-absorbing insulating layer on the display screen, which layer has apertures which are in registration with the luminescent regions of the display screen.
Claims2
A cathode-ray tube for displaying color pictures comprising a shadow mask having a large number of apertures, a display screen having a large number of regions luminescing in different colors, and electron gun means to generate a number of electron beams, each electron beam being arranged to impinge on luminescent regions of a respective color by means of the apertures in the shadow mask, said display screen being covered on the side facing said electron gun means with a continuous thin metal layer, said metal layer on the side facing said electron gun means being provided with an electron-absorbing and charge-retaining layer having a low electrical conductivity and having apertures which are in registration with the luminescent regions.
Dependencies are inferred from the claim text.