Projection type color television with a single cathode ray tube
US4183053A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1977 |
| Grant date | Jan 8, 1980 |
| Priority date | — |
| Expiry date | Dec 8, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Two electron beams are used to scan a striped color phosphor pattern arranged normal to the scan line in succession so as to increase the total amount of photon emission during the interval between successive line scans. The two beams are oscillated parallel to the scan line so as to increase the dwell time of impinging electrons on the phosphor stripe with a consequential increment in brightness. Beam sensing elements are located in a predetermined positional relationship with the phosphor stripes. Impingement of the scanning beams upon the sensing elements produces an index signal representing the nonlinearity which may be present in the horizontal deflection waveform, which signal is stored for the interval of a subsequent raster scan and retrieved nondestructively at the start of each line scan. The retrieved signal is modulated in frequency with a signal representing the time it takes for the beam to traverse the entire phosphor stripes to compensate for the so-called pincushion distortion. The frequency-modulated index signal is delayed so as to align it in phase with the start of each line scan. The phase-corrected index signal is used to sample a received primary color comp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.