Alignment of cathode ray tube displays using a video graphics controller
US6437829B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1997 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Sep 24, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N17/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Dynamic adjustment techniques for aligning video images in cathode ray tube (CRT) devices are disclosed. A host computer stores correction factor data and video image data in video graphics controller RAM. The host computer processes and transmits the correction factor data, representative of the cathode ray tube distortion characteristics, to the CRT device during the retrace time of the electron beam and video image data during the trace time. The correction factor data may be generated by a vision system, a gain matrix table, interpolation engine or manual methods. Circuitry, within the CRT device, for separating the correction factor data from the video signal is disclosed along with the methods and apparatus used to decode correction data. Data can also be transferred from the monitor back to the host computer over the video connector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.