Graphics light pen and method for raster scan CRT
US4367465A · kind A · utility
50Cited by
6References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1980 |
| Grant date | Jan 4, 1983 |
| Priority date | — |
| Expiry date | Apr 4, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/04892
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A graphics system for a raster scan CRT implements a light pen tracked by a cursor. Hits corresponding to the cursor are distinguished from those corresponding to background data by a selective interlacing technique. A threshold level shifting technique providing accurate measurement of a horizontal component of the cursor allows accurate prediction of the location of the center of the field of view during the next frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.