GB1152290A - Improvements relating to Luminescent Screens for Colour Television Picture Tubes - Google Patents
Improvements relating to Luminescent Screens for Colour Television Picture TubesInfo
- Publication number
- GB1152290A GB1152290A GB55375/67A GB5537567A GB1152290A GB 1152290 A GB1152290 A GB 1152290A GB 55375/67 A GB55375/67 A GB 55375/67A GB 5537567 A GB5537567 A GB 5537567A GB 1152290 A GB1152290 A GB 1152290A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- lies
- graphite
- colour
- contrast
- 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
-
- 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
- H01J29/185—Luminescent screens measures against halo-phenomena
-
- 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
- H01J29/28—Luminescent screens with protective, conductive or reflective layers
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
Abstract
1,152,290. Colour television tubes. COMPAGNIE FRANCAISE DE TELEVISION. 5 Dec., 1967 [19 Jan., 1967; 30 Oct., 1967], No. 55375/67. Heading H1D. In a three-gun three colour picture tube having a luminescent screen comprising, for example, the colour strips 6-8, and a postfocusing grid adjacent the screen, the screen being provided with a thin aluminium coating 5 and a graphite layer 4 deposited on the aluminium coating, the graphite layer is porous and has a density d gm/cm<SP>3</SP> and a thickness e microns such that the produce d, e lies between 2À6 and 5À1. The graphite serves to reduce secondary electron emission which reduces the contrast, and the range given produces an improvement in contrast without excessively reducing the brightness by reducing the energy of the primary electrons. Preferably d lies between 0À2 and 0À3 and e lies between 13 and 17. The layer may be formed by spraying a colloidal suspension of graphite grains in ethyl alcohol, the grains having a diameter of about 1 micron. To this suspension is added a filmforming material such as a collodion or a methyl methacrylate which is eliminated during subsequent heat treatment phases in the preparation of the screen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR91730A FR1515211A (en) | 1967-01-19 | 1967-01-19 | Improvement to luminescent color television tube screens |
FR126302A FR93385E (en) | 1967-01-19 | 1967-10-30 | Improvement to luminescent screens of color television tubes. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1152290A true GB1152290A (en) | 1969-05-14 |
Family
ID=26174552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB55375/67A Expired GB1152290A (en) | 1967-01-19 | 1967-12-05 | Improvements relating to Luminescent Screens for Colour Television Picture Tubes |
Country Status (10)
Country | Link |
---|---|
US (1) | US3475639A (en) |
BE (1) | BE707508A (en) |
CH (1) | CH459294A (en) |
DE (1) | DE1537070A1 (en) |
DK (1) | DK124299C (en) |
ES (1) | ES348526A1 (en) |
FR (2) | FR1515211A (en) |
GB (1) | GB1152290A (en) |
NL (1) | NL6800398A (en) |
SE (1) | SE323983B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2120840A (en) * | 1982-05-12 | 1983-12-07 | Philips Electronic Associated | Contrast improvement in vacuum image display devices |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3703401A (en) * | 1970-12-28 | 1972-11-21 | Rca Corp | Method for preparing the viewing-screen structure of a cathode-ray tube |
GB1404659A (en) * | 1971-09-08 | 1975-09-03 | Hitachi Ltd | Postdeflection acceleration type colour cathode-ray tube |
GB1405899A (en) * | 1971-09-08 | 1975-09-10 | Hitachi Ltd | Method of forming secondary electron emission preventing layer for post-deflection acceleration type colour picture tube |
US4025661A (en) * | 1972-11-13 | 1977-05-24 | Rca Corporation | Method of making viewing-screen structure for a cathode-ray tube |
JPS4979169A (en) * | 1972-12-04 | 1974-07-31 | ||
JPS49107173A (en) * | 1973-02-14 | 1974-10-11 | ||
NL7504324A (en) * | 1975-04-11 | 1976-10-13 | Philips Nv | CATHOD BEAM TUBE FOR DISPLAYING COLORED IMAGES. |
US4160187A (en) * | 1975-11-05 | 1979-07-03 | Gte Sylvania Incorporated | Post-deflection acceleration crt system |
US4353005A (en) * | 1976-04-12 | 1982-10-05 | U.S. Philips Corporation | Camera tube with mutually insulated, light absorbing particles on gun side of target |
US5639330A (en) * | 1990-03-14 | 1997-06-17 | Matsushita Electric Industrial Co., Ltd. | Method of making an image display element |
DE102016206899A1 (en) * | 2016-04-22 | 2017-10-26 | Cosma Engineering Europe Gmbh | Method for increasing the plastic deformability of a workpiece with an absorbent |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2916664A (en) * | 1954-12-06 | 1959-12-08 | Westinghouse Electric Corp | Electron discharge device |
US2878411A (en) * | 1955-03-21 | 1959-03-17 | Chromatic Television Lab Inc | Color television display screen |
US2858466A (en) * | 1955-11-25 | 1958-10-28 | Westinghouse Electric Corp | Method of reducing secondary emission from bombarded surfaces |
US3223872A (en) * | 1962-08-13 | 1965-12-14 | Paramount Pictures Corp | Color screen with electron- and lightabsorptive material separating adjacent color strips |
-
1967
- 1967-01-19 FR FR91730A patent/FR1515211A/en not_active Expired
- 1967-10-30 FR FR126302A patent/FR93385E/en not_active Expired
- 1967-11-27 US US685823A patent/US3475639A/en not_active Expired - Lifetime
- 1967-11-30 CH CH1687767A patent/CH459294A/en unknown
- 1967-12-04 BE BE707508D patent/BE707508A/xx not_active IP Right Cessation
- 1967-12-05 GB GB55375/67A patent/GB1152290A/en not_active Expired
- 1967-12-20 DE DE19671537070 patent/DE1537070A1/en active Pending
- 1967-12-21 DK DK645167AA patent/DK124299C/en not_active IP Right Cessation
- 1967-12-22 ES ES348526A patent/ES348526A1/en not_active Expired
-
1968
- 1968-01-11 NL NL6800398A patent/NL6800398A/xx unknown
- 1968-01-17 SE SE603/68A patent/SE323983B/xx unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2120840A (en) * | 1982-05-12 | 1983-12-07 | Philips Electronic Associated | Contrast improvement in vacuum image display devices |
Also Published As
Publication number | Publication date |
---|---|
NL6800398A (en) | 1968-07-22 |
FR93385E (en) | 1969-03-21 |
SE323983B (en) | 1970-05-19 |
DK124299C (en) | 1973-02-19 |
DK124299B (en) | 1972-10-02 |
FR1515211A (en) | 1968-03-01 |
CH459294A (en) | 1968-07-15 |
US3475639A (en) | 1969-10-28 |
BE707508A (en) | 1968-04-16 |
DE1537070A1 (en) | 1970-07-30 |
ES348526A1 (en) | 1969-06-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |