GB531295A - Improvements in lighting control in dependence upon projected images - Google Patents
Improvements in lighting control in dependence upon projected imagesInfo
- Publication number
- GB531295A GB531295A GB2073839A GB2073839A GB531295A GB 531295 A GB531295 A GB 531295A GB 2073839 A GB2073839 A GB 2073839A GB 2073839 A GB2073839 A GB 2073839A GB 531295 A GB531295 A GB 531295A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- colour
- television
- image
- ray tube
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
- H04N5/58—Control of contrast or brightness in dependence upon ambient light
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
531,295. Television. BRITISH THOMSONHOUSTON CO., Ltd., and MYNALL, D. J. July 17, 1939, No. 20738. [Class 40 (iii)] The lighting of the auditorium of the screen surround of a television receiving apparatus is controlled in accordance with the average intensity or colour of the image on the screen by voltage derived from the D.C. component of the image signal, either directly from the signals applied to the control electrode of a cathode-ray tube or from an earlier tapping off with D.C. reinsertion. For colour television using separate projectors for each colour, each projector produces its separate control. As shown, the D.C. component of the image signals applied across a resistance R between the cathode K and a control electrode E of a cathode-ray tube T is fed through a resistance R2 to a condenser C connected to a voltage controlling unit D1 supplying a bank of lamps D2. The unit D1 may contain grid controlled gas-discharge devices controlling saturable reactors, and receives its supply by leads S. Specification 524,579 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2073839A GB531295A (en) | 1939-07-17 | 1939-07-17 | Improvements in lighting control in dependence upon projected images |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2073839A GB531295A (en) | 1939-07-17 | 1939-07-17 | Improvements in lighting control in dependence upon projected images |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB531295A true GB531295A (en) | 1941-01-01 |
Family
ID=10150824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2073839A Expired GB531295A (en) | 1939-07-17 | 1939-07-17 | Improvements in lighting control in dependence upon projected images |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB531295A (en) |
-
1939
- 1939-07-17 GB GB2073839A patent/GB531295A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU97100939A (en) | VIDEO SYSTEM WITH A POWER SOURCE OF A SCREENING NETWORK RESPONDING TO THE ARNS SYSTEM | |
| GB534973A (en) | Improvements in or relating to television receivers | |
| US2354108A (en) | Copying apparatus | |
| GB531295A (en) | Improvements in lighting control in dependence upon projected images | |
| GB1345005A (en) | Low light tv camera | |
| GB524672A (en) | Improvements in or relating to the control of television receivers | |
| US2121990A (en) | Television | |
| GB1215024A (en) | Television receiver | |
| JPS563949A (en) | Color picture tube device | |
| US3144579A (en) | Two gun storage tube utilizing pulse circuitry | |
| GB605122A (en) | Improvements in or relating to projectors for the image of a cathode-ray tube | |
| GB480521A (en) | Improvements in or relating to cathode ray television apparatus | |
| GB1018935A (en) | Improvements in or relating to x-ray diagnosing apparatus | |
| US2655554A (en) | Generation of picture signals for television transmission | |
| GB661807A (en) | Television film scanning apparatus | |
| JPS60205494A (en) | Color display unit | |
| GB777936A (en) | Improvements in and relating to colour switching circuits including reflector type colour television receiver tubes | |
| GB501535A (en) | Improvements in or relating to television and like systems | |
| GB478238A (en) | Improvements in or relating to light sensitive electron discharge tubes | |
| GB533993A (en) | Improvements in colour television | |
| SU108554A1 (en) | A method of improving the quality of a raster in a photo-telegraph system | |
| ES255529A1 (en) | Improvements in or relating to circuit arrangements for the prevention of screen burning in cathode ray tubes | |
| US2145134A (en) | Electric arc illumination | |
| GB528444A (en) | Improvements in television receivers of the optical projection type and other image projection systems | |
| GB680916A (en) | Improvements relating to cathode ray tube apparatus |