Optical element rotating device for liquid-crystal
US5550605A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1994 |
| Grant date | Aug 27, 1996 |
| Priority date | — |
| Expiry date | Jul 29, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/317
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid-crystal projector with a light source, a projection lens set, and a liquid-crystal panel arranged between the light source and the projection lens set for displaying a video signal included in an odd field and a video signal included in an even field alternately at a predetermined period of time by the same pixels thereof in synchronization with a vertical synchronizing signal in the video signal. The liquid-crystal projector includes a wedge-shaped prism rotating device arranged between the projection lens set and a screen. The wedge-shaped prism rotating device includes an electromagnetic solenoid for converting a reciprocating motion of a solenoid plunger to a periodic rotational motion of a wedge-shaped prism about its optic axis clockwise and counterclockwise. The liquid-crystal projector also includes a control unit associated with the prism rotating device, for producing the periodic rotational motion in synchronization with the vertical synchronizing signal, so that both projected positions of picture images on the screen, each image included in either one of the odd and even fields, are offset to each other by one-pixel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.