Projector with adjustably positioned image plate
US6361171B1 · kind B1 · utility
30Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2000 |
| Grant date | Mar 26, 2002 |
| Priority date | — |
| Expiry date | Jan 28, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N17/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projector is often positioned so that its optical axis is at an imperfect orthogonal angle with respect to a projection screen. This position causes a keystone distortion as well as imperfect focus in the projected image. To correct these undesirable problems, initially, a lens and/or an image-forming plate is independently repositioned to bring the projected image into focus based upon user input data. The keystone distortion is also corrected by redrawing the image on an image-forming surface based upon additional user input data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.