Virtual screen display device
US6292305A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1998 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Aug 24, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0136
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A virtual screen display apparatus includes a display arranged to generate display information and having an effective diagonal length DLC and an optical projecting element arranged to receive the display information from the display and to project and form an image, the optical projecting element having an effective F number which is defined by Fe=S1/PuD wherein S1 is a distance between the display and a principal point of the optical projecting element and PuD is a diameter of an exit pupil of the optical projecting element. A field optical element arranged to form an in-space image in a position of a virtual screen and to direct a divergent light flux from the virtual screen to a view region where the image is viewable to an observer. A diameter of a range in which the image is viewable to the observer in the view region is ERD and a diagonal length of the virtual screen is VSD and a distance between the virtual screen and the view region is VSP, and the following equation is satisfied: EQU VSD/VSP=DLC/(ERD.times.Fe).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.