GB728179A - Tri-colour phosphor screens - Google Patents
Tri-colour phosphor screensInfo
- Publication number
- GB728179A GB728179A GB7800/53A GB780053A GB728179A GB 728179 A GB728179 A GB 728179A GB 7800/53 A GB7800/53 A GB 7800/53A GB 780053 A GB780053 A GB 780053A GB 728179 A GB728179 A GB 728179A
- Authority
- GB
- United Kingdom
- Prior art keywords
- activator
- per cent
- zinc
- colour
- elements
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
- H01J29/30—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines
- H01J29/32—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television
Landscapes
- Luminescent Compositions (AREA)
- Glass Compositions (AREA)
Abstract
728,179. Luminescent screens. RADIO CORPORATION OF AMERICA. March 20, 1953 [March 25, 1952], No. 7800/53. Drawings to Specification. Class 39 (1). A luminescent screen for a colour television receiver has a multiplicity of phosphor triads, in which the red elements are zinc selenide, or zinc cadmium selenide having at least 8 parts Zn to 1 part Cd by weight, plus 0.003 to 0.03 per cent Cu activator, the blue elements are zinc sulphide or zinc seleno-sulphide having at least 8 parts S to 1 part Se by weight plus 0.005 to 0.025 per cent Ag activator, and the green elements are zinc silicate plus 0.1 to 1.0 per cent Mn activator. In the zinc cadmium selenide the ratio of Zn to Cd is preferably 25: 1. The zinc sulphide or seleno-sulphide may have 0.015 per cent Ag activator. The red and blue phosphors are prepared by firing at 750- 1250‹ C., preferably in a nitrogen atmosphere, using 2 per cent of NaCl or NH 4 Cl as a flux. The colour emission shade can be varied by varying the firing temperature and also, in the case of the blue phosphor, by varying the S : Se ratio. The green phosphor is preferably zinc orthosilicate with 0.3 per cent Mn activator. The tri-colour elements may be lines, dots or triangles, and may be disposed in one or more planes, or angularly as on the sides of pyramids, ridges or cells. The screen may be transparent, for example if elements of one colour are on one side and the elements of the other two colours are on the other side, or opaque, and may be flat or curved. The preferred red phosphor comprises 97 parts of Zn Se, 3 parts of Cd Se and 0.01 parts Cu activator. The deepening effect on the colour of increasing the percentage of Cd Se from 1-10 per cent is indicated graphically, Fig. 2 (not shown). Prior art phosphors for colour television receivers are referred to as follows: (a) blueemitting calcium magnesium silicate with 1 per cent Ti activator, (b) red-emitting cadmium borate with 1 per cent Mn activator, (c) redemitting zinc orthophosphate with 1 per cent Mn activator, (d) green zinc silicate with Mn activator (willemite). Phosphor (b) requires a didymium glass filter to correct the colour.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US728179XA | 1952-03-25 | 1952-03-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB728179A true GB728179A (en) | 1955-04-13 |
Family
ID=22109935
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7800/53A Expired GB728179A (en) | 1952-03-25 | 1953-03-20 | Tri-colour phosphor screens |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE941508C (en) |
FR (1) | FR1075553A (en) |
GB (1) | GB728179A (en) |
NL (1) | NL177092B (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE828575C (en) * | 1949-08-08 | 1952-01-17 | Philips Nv | Electric discharge tubes with a luminescent screen |
-
0
- NL NLAANVRAGE7503543,A patent/NL177092B/en unknown
-
1953
- 1953-03-09 FR FR1075553D patent/FR1075553A/en not_active Expired
- 1953-03-20 GB GB7800/53A patent/GB728179A/en not_active Expired
- 1953-03-22 DE DER11255A patent/DE941508C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1075553A (en) | 1954-10-18 |
DE941508C (en) | 1956-04-12 |
NL177092B (en) |
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