Apparatus for aligning raster scanned image to touch panel
US4929935A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1986 |
| Grant date | May 29, 1990 |
| Priority date | — |
| Expiry date | May 2, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/22
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for aligning a raster scanned display uses a microprocessor to control timing for horizontal and vertical synchronizing signals. An additional delay device may be provided to improve alignment resolution. When the aligning apparatus is used with a touch panel, an alignment screen is displayed, including aligning touchkeys. By depressing the touch panel at the displayed touchkeys, a user provides image position information to the microprocessor. The microprocessor corrects image alignment to the touch panel by varying timing interval counts stored in registers of a video controller for front and back porch intervals of horizontal and vertical signals. Where resolution is to be improved, delay parameter settings are provided to the additional delay device. Alternatively, the counts in the registers may be fixed and alignment may be controlled completely by the delay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.