Rectangular grade black surround screen

Claim 2

A black surround color television picture tube having a substantially rectangular faceplate and a screen assembly including an aperture mask spaced from a plurality of viewable image elemenTs distributed in a rectangular field over the faceplate and characterized in that said viewable image elements diminish gradually in area from the center to the edge of the faceplate such that elements having the same area are disposed on concentric loci which are centered in said field and which have a substantially rectangular geometry.

Claim 3

A black surround color television picture tube as set forth in claim 1 wherein said viewable image elements comprise, light emitting color phosphors arranged in groups or red, blue and green.

Claim 4

A black surround color television picture tube as set forth in claim 2 wherein said viewable image elements comprise dots of said light emitting phosphors arranged in triads, said dots being spaced apart from each other on said faceplate and having areas diminishing in accordance with said pattern.

Claim 5

A rectangular screen assembly for a color television picture tube including a matrix of light absorbing material on said faceplate, said matrix having holes arranged in a rectangular field over said faceplate coextensive with the maximum viewable areas of light emitting phosphors, said holes having areas diminishing in accordance with distance from the center of said faceplate and arranged in a pattern characterized in that lines of holes of substantially the same areas occur at the same percentages of distance from said center.

Claim 6

A rectangular screen assembly for a color television picture tube including a matrix of light absorbing material on said faceplate, said matrix having holes arranged in a rectangular field over said faceplate coextensive with the maximum viewable areas of light emitting phosphors, said holes having areas diminishing in accordance with distance from the center of said faceplate and arranged in a pattern characterized in that lines of holes of substantially the same areas occur at the same percentages of distance from said center.

Claim 7

A screen assembly for a color cathode ray tube having a faceplate with a black surround grille including a multiplicity of holes, each defining the viewable area of an associated deposit of light emitting phosphor, distributed throughout said faceplate with an area grade characterized in that the hole areas decrease in a predetermined manner with distance from the center of the faceplate and further characterized in that holes having substantially the same areas are disposed along a substantially rectangular locus centered in said faceplate so that the screen assembly, when incorporated into a tube, will have a viewable phosphor area characteristic comprising a concentric series of substantially rectangularly shaped patterns of equal brightness.

Claim 8

A screen assembly for a color cathode ray tube having a faceplate with a black surround grille including a multiplicity of holes, each defining the viewable area of an associated deposit of light emitting phosphor, distributed throughout said faceplate with an area grade characterized in that the hole areas decrease in a predetermined manner with distance from the center of the faceplate and further characterized in that holes having substantially the same areas are disposed along a substantially rectangular locus centered in said faceplate so that the screen assembly, when incorporated into a tube, will have a viewable phosphor area characteristic comprising a concentric series of substantially rectangularly shaped patterns of equal brightness.

Claim 9

A screen assembly as set forth in claim 5 wherein said holes are circular and said phosphors comprise deposits of red, green and blue light emitting phosphor materials.

Claim 10

A black surround color television picture tube having a substantially rectangular faceplate and a screen assembly including an aperture mask spaced from a plurality of viewable image elements distributed in a rectangular field over the faceplate and characterized in that in at least one common coordinate direction said viewable image elements diminish gradually in dimension from the center to the edge of the faceplate such that elements having the same value of said dimension in said common coordinate direction are disposed on concentric loci which are centered in said field and which have a non-circular geometry.

Claim 11

A black surround color television picture tube having a substantially rectangular faceplate and a screen assembly including an aperture mask spaced from a plurality of viewable image elements distributed in a rectangular field over the faceplate and characterized in that in at least one common coordinate direction said viewable image elements diminish gradually in dimension from the center to the edge of the faceplate such that elements having the same value of said dimension in said common coordinate direction are disposed on concentric loci which are centered in said field and which have a non-circular geometry.