GB1306335A - - Google Patents
Info
- Publication number
- GB1306335A GB1306335A GB1306335DA GB1306335A GB 1306335 A GB1306335 A GB 1306335A GB 1306335D A GB1306335D A GB 1306335DA GB 1306335 A GB1306335 A GB 1306335A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- llllll
- light
- degrees
- normal
- 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
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/89—Optical components associated with the vessel
- H01J2229/8913—Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices
Landscapes
- Luminescent Compositions (AREA)
Abstract
1306335 Optical filters STANDARD TELEPHONES & CABLES Ltd 1 July 1971 30897/71 Heading G2J [Also in Division H1] A display device (e.g. c.r.t.) has a light scattering light, emissive display medium covered by a passband interference filter having an effective refractive index as defined, not greater than 1À65 (e.g. 1À46), such that when light is reflected back into the display medium a proportion will be scattered to re-emerge at angles for which the filter is transmitting. The display device may be a c.r.t. with a granular (p 1 ) phosphor (4) and the filter (3) may be within the tube envelope. The construction improves contrast by ensuring at least part of the re-emitted light is at an angle closer to the normal and is not selectively reflected. The filter may be of ZnS and cryolite alternating layers and of structure S L H LLLLLL H L H LLLLLL H L H LLLLLL H where L and H are low and high Á“ wave layers and S is the substrate. The filter passband may be matched at an angle other than the normal (e.g. 30 degrees Œ15 degrees).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3089771 | 1971-07-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1306335A true GB1306335A (en) | 1973-02-07 |
Family
ID=10314824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1306335D Expired GB1306335A (en) | 1971-07-01 | 1971-07-01 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1306335A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2149203A (en) * | 1983-11-04 | 1985-06-05 | Mitsubishi Electric Corp | Projection cathode-ray tube |
| GB2176048A (en) * | 1985-05-29 | 1986-12-10 | Philips Nv | Projection television display tube and projection television device having at least one such tube |
| EP0212715A1 (en) * | 1985-08-12 | 1987-03-04 | Koninklijke Philips Electronics N.V. | Projection television display device |
| GB2244857A (en) * | 1990-05-09 | 1991-12-11 | Mitsubishi Electric Corp | Projection cathode ray tube |
-
1971
- 1971-07-01 GB GB1306335D patent/GB1306335A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2149203A (en) * | 1983-11-04 | 1985-06-05 | Mitsubishi Electric Corp | Projection cathode-ray tube |
| GB2176048A (en) * | 1985-05-29 | 1986-12-10 | Philips Nv | Projection television display tube and projection television device having at least one such tube |
| GB2176048B (en) * | 1985-05-29 | 1989-07-05 | Philips Nv | Projection television display tube and projection television device comprising at least one such tube |
| EP0212715A1 (en) * | 1985-08-12 | 1987-03-04 | Koninklijke Philips Electronics N.V. | Projection television display device |
| US5061993A (en) * | 1985-08-12 | 1991-10-29 | U.S. Philips Corporation | Projection television display device |
| GB2244857A (en) * | 1990-05-09 | 1991-12-11 | Mitsubishi Electric Corp | Projection cathode ray tube |
| GB2244857B (en) * | 1990-05-09 | 1994-06-01 | Mitsubishi Electric Corp | Projection cathode-ray tube |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
| PCNP | Patent ceased through non-payment of renewal fee |