Method and apparatus for aligning visual images with visual display devices
US5424839A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1993 |
| Grant date | Jun 13, 1995 |
| Priority date | — |
| Expiry date | Mar 1, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N17/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus is provided for ensuring that an image projected upon a visual display device is properly aligned with the viewing surface of the display device. Important to achieving the proper alignment is the use of a fluorescent ink which is visible only when illuminated under ultraviolet light. Use of the fluorescent ink allows a pattern of reference points, constituting an alignment pattern, to be permanently marked directly on the viewing surface of the visual display device, for example. Since the alignment pattern is permanently marked and is visible only when illuminated with ultraviolet light, alignment between the image and the display device can be immediately determined without the aid of additional equipment such as is employed by previously known image alignment systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.