Scheme for determining position of surface contact of cathode ray tube screen
US5119075A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1990 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Jun 18, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A touch-screen scheme is employed in an arrangement wherein an inquiry and a choice of responses thereto are displayed on a CRT screen. In accordance with this scheme, a first touch-screen device is held against a predetermined spot on the screen. A selection is made by holding a second touch-screen device against the area of the screen corresponding to the desired response. When the electron beam which scans the CRT screen sweeps across the first and second touch-screen devices at different times, the two device generate two signal outputs. The touch-position or the selection is determined based on the time difference between the two signal outputs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.