Alignment of a video monitor using an on-screen display chip and a gain matrix table
US6052146A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1996 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Mar 5, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/2335
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit within a video monitor for making corrections during horizontal scan includes a data storage device containing information relating to a selected display parameter, an integrator receptive of the stored information and adapted to produce an integrated signal therefrom, and an amplifier receptive of the integrated signal for supplying signals to the video monitor based on the integrated signal. The information supplied from the data storage device to the integrator is encoded in a pulse density modulated waveform via a tri-state gate and a one-shot timer. The information stored in the data storage device is stored in bytes, each byte containing a "sign bit" and a plurality of data bits. The present invention also discloses the use of an on-screen display chip that uses stored fonts to generate a pulse-density modulated signal. Gradients between rows of fonts can be generated using selected fonts from a font gradient table or can be produced using an up-down counter. Gain matrix tables are also disclosed that reside in the vision system to aid the vision system in predicting proper alignment of less intelligent monitors. Gain matrix table data can also be supplied to the mo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.