Method for producing tri-color screens for television picture tubes

A method for preparing a patterned, integrally-colored, transparent, tri-color glass screen for the face plate of a color television picture tube comprising the steps of:

• (a) forming a glass body suitable as a face plate for a television picture tube or a glass body suitable for attachment to said face plate to form a composite body consisting essentially, in weight percent on the oxide basis as calculated from the batch, of about 10-20% Na.sub.2 O, 0.0005-0.3% Ag, 1-4% F, an amount of at least one halide selected from the group consisting of Cl, Br, and I at least sufficient to react stoichiometrically with the Ag, but not more than about 3%, and the remainder SiO.sub.2 ;
• (b) placing an appropriate electron shadow mask in contact with said glass body at a position to expose about one-third of the pattern area;
• (c) subjecting said one-third of the pattern area to high energy or actinic radiation for a period of time sufficient to develop a latent image therein leading to the production of a first integral color therein selected from the group of red, green, and blue;
• (d) moving the shadow mask and/or the glass body a distance equal to about one-third of the hole separation in said shadow mask;
• (e) subjecting a second one-third of the pattern area to high energy or actinic radiation for a period of time sufficient to develop a latent image therein leading to the production of a second integral color therein selected from the group of red, green, and blue;
• which is different from the color produced by step (c)
• (f) moving the shadow mask and/or the glass body another distance equal to about one-third of the hole separation in said shadow mask;
• (g) subjecting a third one-third of the pattern area to high energy or actinic radiation for a period of time sufficient to develop a latent image therein leading to the production of a third integral color therein selected from the group of red, green, and blue;
• which is different from the colors produced by steps (c) and (e)
• (h) heating said glass article to a temperature between about the transformation range of the glass and the softening point thereof for a sufficient length of time to cause nucleation and growth of microcrystals of alkali metal fluoride containing at least one silver halide selected from the group consisting of silver chloride, silver bromide, and silver iodide in the areas of said latent image;
• (i) subjecting at least said previously-exposed portions of said glass body to high energy or actinic radiation;
• (j) heating said glass body to a temperature between about the transformation range of the glass and the softening point thereof for a sufficient length of time to cause metallic silver to be deposited as discrete colloidal particles less than 200A in the smallest dimension, and/or deposited within said microcrystals, the silver-containing part of the microcrystal being less than about 200A in the smallest dimension, and/or deposited on the surface of said microcrystals, the portion of the microcrystal coated with silver being less than about 200A in the smallest dimension said microcrystals having a concentration of at least 0.005% by volume and causing the integral red, green, and blue coloration;
• and then
• (k) cooling said glass body to ambient temperature.

A method for preparing a patterned, integrally-colored, transparent, tri-color glass screen for the face plate of a color television picture tube comprising the steps of:

• (a) forming a glass body suitable as a face plate for a television picture tube or a glass body suitable for attachment to said faceplate to form a composite body consisting essentially, in weight percent on the oxide basis as calculated from the batch, of about 10-20% Na.sub.2 O, 0.0005-0.3% Ag, 1-4% F, an amount of at least one halide selected from the group consisting of Cl, Br, and I at least sufficient to react stoichiometrically with the Ag, but not more than about 3%, and the remainder SiO.sub.2 ;
• (b) placing an electron shadow mask at an appropriate uniform distance from said glass body;
• (c) directing collimated high energy or actinic radiation through said mask toward said glass body at the proper angle to expose about one-third of the pattern area for a period of time sufficient to develop a latent image therein leading to the production of a first integral color therein selected from the group of red, green, and blue;
• (d) directing collimated high energy or actinic radiation through said mask toward said glass body at the proper angle to expose a second one-third of the pattern area for a period of time sufficient to develop a latent image therein leading to the production of a second integral color therein selected from the group of red, green, and blue;
• which is different from the color produced by step (c)
• (e) directing collimated high energy or actinic radiation through said mask toward said glass body at the proper angle to expose a third one-third of the pattern area for a period of time sufficient to develop a latent image therein leading to the production of a third integral color therein selected from the group of red, green, and blue;
• which is different from the colors produced by steps (c) and (d)
• (f) heating said glass article to a temperature between about the transformation range of the glass and the softening point thereof for a sufficient length of time to cause nucleation and growth of microcrystals of alkali metal fluoride containing at least one silver halide selected from the group consisting of silver chloride, silver bromide, and silver iodide in the areas of said latent image;
• (g) subjecting at least said previously-exposed portions of said glass body to high energy or actinic radiation while at least said portions are at a temperature between about 200.degree.-410.degree. C. for a sufficient length of time to cause metallic silver to be deposited as discrete colloidal particles less than about 200A in the smallest dimension, and/or deposited within said microcrystals, the silver-containing part of the microcrystal being less than about 200A in the smallest dimension, and/or deposited on the surface of said microcrystals, the portion of the microcrystal coated with silver being less than about 200A in the smallest dimension, said microcrystals having a concentration of at least 0.005% by volume and causing the integral red, green, and blue coloration;
• and then
• (h) cooling said glass body to ambient temperature.

A method for preparing a patterned, integrally-colored, transparent, tri-color glass screen for the face plate of a color television picture tube comprising the steps of:

• (a) forming a glass body suitable as a face plate for a television picture tube or a glass body suitable for attachment to said face plate to form a composite body consisting essentially, in weight percent on the oxide basis as calculated from the batch, of about 10-20% Na.sub.2 O, 0.0005-0.3% Ag, 1-4% F, an amount of at least one halide selected from the group consisting of Cl, Br, and I at least sufficient to react stoichiometrically with the Ag, but not more than about 3%, and the remainder SiO.sub.2 ;
• (b) placing an electron shadow mask at an appropriate uniform distance from said glass body;
• (c) directing collimated high energy or actinic radiation through said mask toward said glass body at the proper angle to expose about one-third of the pattern area for a period of time sufficient to develop a latent image therein leading to the production of a first integral color therein selected from the group of red, green, and blue;
• (d) directing collimated high energy or actinic radiation through said mask toward said glass body at the proper angle to expose a second one-third of the pattern area for a period of time sufficient to develop a latent image therein leading to the production of a second integral color therein selected from the group of red, green, and blue;
• which is different from the color produced by step (c)
• (e) directing collimated high energy or actinic radiation through said mask toward said glass body at the proper angle to expose a third one-third of the pattern area for a period of time sufficient to develop a latent image therein leading to the production of a third integral color therein selected from the group of red, green, and blue;
• which is different from that colors produced by steps (c) and (d)
• (f) heating said glass body to a temperature between about the transformation range of the glass and the softening point thereof for a sufficient length of time to cause nucleation and growth of microcrystals of alkali metal fluoride containing at least one silver halide selected from the group consisting of silver chloride, silver bromide, and silver iodide in the areas of said latent image;
• (g) subjecting at least said previously-exposed portion of said glass body to high energy or actinic radiation;
• (h) heating said glass body to a temperature between about the transformation range of the glass and the softening point thereof for a sufficient length of time to cause metallic silver to be deposited as discrete colloidal particles less than 200A in the smallest dimension, and/or deposited within said microcrystals, the silver-containing part of the microcrystal being less than about 200A in the smallest dimension, and/or deposited on the surface of said microcrystals, the portion of the microcrystal coated with silver being less than about 200A in the smallest dimension, said microcrystals having a concentration of at least 0.005% by volume and causing the integral red, green, and blue coloration, and then
• (i) cooling said glass body to ambient temperature.

A method for preparing a patterned, integrally-colored, transparent, tri-color glass screen for the face plate of a color television picture tube, wherein said face plate has an overall green background, comprising the steps of:

• (a) forming a glass body suitable as a face plate for a television picture tube or a glass body suitable for attachment to said face plate to form a composite body consisting essentially, in weight percent on the oxide basis as calculated from the batch, of about 10-20% Na.sub.2 O, 0.0005-0.3% Ag, 1-4% F, an amount of at least one halide selected from the group consisting of Cl, Br, and I at least sufficient to react stoichiometrically with the Ag, but not more than about 3%, and the remainder SiO.sub.2 ;
• (b) subjecting said glass body to high energy or actinic radiation for a period of time sufficient to develop a latent image therein leading to the production of an integral green color therein;
• (c) placing an electron shadow mask at an appropriate uniform distance from said glass body;
• (d) directing collimated high energy or actinic radiation through said mask toward said glass body at the proper angle to expose about one-third of the pattern area for a period of time sufficient to develop a latent image therein leading to the production of a first integral color therein selected from the group of red and blue;
• (e) directing collimated high energy or actinic radiation through said mask toward said glass body at the proper angle to expose a second one-third of the pattern area for a period of time sufficient to develop a latent image therein leading to the production of a second integral color therein selected from the group of red and blue;
• which is different from the color produced by step (d)
• (f) heating said glass body to a temperature between about the transformation range of the glass and the softening point thereof for a sufficient length of time to cause nucleation and growth of microcrystals of alkali metal fluoride containing at least one silver halide selected from the group consisting of silver chloride, silver bromide, and silver iodide in the areas of said latent image;
• (g) subjecting said glass body to high energy or actinic radiation;
• (h) heating said glass body to a temperature between about the transformation range of the glass and the softening point thereof for a sufficient length of time to cause metallic silver to be deposited as discrete colloidal particles less than 200A in the smallest dimension, and/or deposited within said microcrystals, the silver-containing part of the microcrystal being less than about 200A in the smallest dimension, and/or deposited on the surface of said microcrystals, the portion of the microcrystal coated with silver being less than about 200A in the smallest dimension, said microcrystals having a concentration of at least 0.005% by volume and causing the integral red, green, and blue coloration;
• and then
• (i) cooling said glass body to ambient temperature.