Video projection apparatus and method of displaying a video image composed of pixels of a defined size
US6262781A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1998 |
| Grant date | Jul 17, 2001 |
| Priority date | — |
| Expiry date | Feb 18, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/74
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a video projection device for showing a video picture composed of picture points of defined magnitude on a screen with at least one light source for emitting a light bundle with a predetermined beam profile for illuminating every picture point on the screen during a predetermined time interval, it is provided that the beam profile of the light bundle is expanded wider than the defined magnitude of the respective picture point to be illuminated and the time interval is so short that the magnitude of the picture point recognized in the eye of an observer watching the video picture is perceptible in conformity with the defined size of the picture point. A method, in which a video picture on a screen is formed of picture points in that a light bundle with a predetermined beam profile is directed onto the screen for the illumination, in each instance, of a picture point of defined size for a predetermined time interval, is characterized in that a light bundle with a beam profile which is expanded further than those by means of the defined size of the picture point to be illuminated is used in the method, and every picture point is illuminated within a time interval which is short eno…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.