Luminescent screen comprising phosphor cores luminescent in first color and phosphor coatings luminescent in second color

Claim 2

A luminescent screen comprising a substrate and a layer of coated particles on said substrate, each of said coated particles comprising a base particle and a coating layer of phosphor thereon and wherein: each of said base particles has a plurality of superimposed phosphor coating layers thereon, each of said phosphor coating layers comprises a plurality of superimposed sublayers of colloidal phosphor particles which luminesce in a color different from the other coating layers, said base particles are particles of a phosphor which luminesce in a color different from the colors in which said phosphor coatings luminesce, and said base phosphor particles are substantially larger than said colloidal phosphor particles.

Claim 3

A luminescent screen comprising a substrate and a layer of coated particles on said substrate, each of said coated particles comprising a base particle of a first phosphor which luminesces in a first color and a coating on said base phosphor particle which includes a second phosphor which luminesces in a second color.

Claim 4

A luminescent screen comprising a substrate and a layer of coated particles on said substrate, each of said coated particles comprising a base particle of a first phosphor which luminesces in a first color and a coating on said base phosphor particle which includes a second phosphor which luminesces in a second color.

Claim 5

A luminescent screen according to claim 2 and wherein said coating comprises a plurality of superimposed layers of phosphor particles, each of which layers luminesces in a color different from the others and from said base phosphor particle.

Claim 6

A luminescent screen comprising a substrate and a layer of coated particles on said substrate, each of said coated particle comprising a base particle of a first phosphor which luminesces in a first color and having the following superimposed coating layers thereon in the order named; a first layer of nonluminescent colloidal particles, a layer of colloidal particles of a second phosphor which luminesces in a second color, a second layer of nonluminescent colloidal particles, and a layer of colloidal particles of a third phosphor which luminesces in a third color.

Claim 7

A luminescent screen comprising a substrate and a layer of coated particles on said substrate, each of said coated particle comprising a base particle of a first phosphor which luminesces in a first color and having the following superimposed coating layers thereon in the order named; a first layer of nonluminescent colloidal particles, a layer of colloidal particles of a second phosphor which luminesces in a second color, a second layer of nonluminescent colloidal particles, and a layer of colloidal particles of a third phosphor which luminesces in a third color.

Claim 8

In a color television picture tube, including a screen end and gun means for directing electrons of differing velocities toward said screen end, a luminescent screen at said screen end of said tube, said screen comprising coated particles, individual ones of at least some of said coated particles comprising an inner body of a first phosphor which luminesces in a first color, and a plurality of successive coatings each of which surrounds said body on all sides, said coatings including a first coating of nonluminescent material, a coating of a second phosphor which luminesces in a second color, another coating of noluminescent material outside said last-mentioned phosphor coating, a coating of a third phosphor which luminesces in a third color, said coated particles being adapted when struck by said electrons to produce light the color of which is controlled by the velocity of said electrons, the thickness of said inner body being greater than the thickness of any of said coatings and also great enough to prevent said electrons from passing through said inner body and penetrating its layers on the side away from said gun means.

Claim 9

In a color television picture tube, including a screen end and gun means for directing electrons of differing velocities toward said screen end, a luminescent screen at said screen end of said tube, said screen comprising coated particles, individual ones of at least some of said coated particles comprising an inner body of a first phosphor which luminesces in a first color, and a plurality of successive coatings each of which surrounds said body on all sides, said coatings including a first coating of nonluminescent material, a coating of a second phosphor which luminesces in a second color, another coating of noluminescent material outside said last-mentioned phosphor coating, a coating of a third phosphor which luminesces in a third color, said coated particles being adapted when struck by said electrons to produce light the color of which is controlled by the velocity of said electrons, the thickness of said inner body being greater than the thickness of any of said coatings and also great enough to prevent said electrons from passing through said inner body and penetrating its layers on the side away from said gun means.