Color cathode ray tube having an improved color phosphor screen
US4689520A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1985 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | Jun 28, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/187
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
According to the present invention, there is provided a color cathode ray tube of multi-purpose use in which as a red phosphor of a color phosphor screen, (ZnCd)S : Ag or (ZnCd)S : Cu phosphor of short decay time is added to rare earth phosphor to have an adding amount of 5 to 30 weight % relative to the total amount of red phosphor so that with respect to the red light emission, the high visibility brightness similar to that of the ordinary color television picture tube can be obtained. Also, since the brightness is lowered rapidly in the early stage of the light emission, the address detection can be carried out positively by, for example, a light pen pick-up.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.