Flat configuration color CRT display apparatus with scanning correction for component positioning error
US5068579A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1990 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | May 18, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J31/126
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image display apparatus includes a flat configuration CRT which is provided with a second set of horizontal deflection electrodes in addition to the main horizontal deflection electrodes. A sawtooth waveform correction deflection voltage is applied to the second electrodes such as to slow the rate of electron beam scanning each time a portion of a fluorescent layer pattern of the screen is scanned, thereby increasing display brightness, while in addition the correction deflection voltage and the electron beam modulation signals are phase shifted by a mutually identical amount once in each scan line such as to compensate for a position deviation between the main horizontal deflection electrodes and the fluorescent layer pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.