Display systems
US4262290A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 7, 1979 |
| Grant date | Apr 14, 1981 |
| Priority date | — |
| Expiry date | May 7, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a cathode-ray tube display system, signals defining the coordinates of the element of the screen on which the cathode-ray beam is incident in its raster scan are supplied to a comparator together with signals defining the coordinates of a series of points defining the image to be displayed. The comparator derives a brightness-weighting signal in respect of each element in accordance with the proximity of that element to those of the points defining the image within a predetermined proximity. The predetermined proximity may be equal to the separation between the points. The system also includes a store, brightness-weighting signals being added together in the store to produce a total signal for each element that is used to control bright-up of the element. The store may include two units that each receive the brightness-weighting signals in respect of elements in two regions comprising several raster lines each, signals from one region being read out of one unit while signals from the other region are written into the other unit. Alternatively, the store may include a plurality of units associated with respective regions of the screen, the units being written into and associated …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.