Visual lecture aid
US5428417A · kind A · utility
Inventor
Key dates
| Filing date | Aug 2, 1993 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | Aug 2, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/26
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An overlay projection apparatus for aiding in the communication of graphic presentations to large audiences by enabling the on-screen writing of overlay icons, highlighting bars and alpha-numeric labels as selected by the presenter. Brightness and color control of overlay highlighting graphics provide audience visual comfort over a wide variation of projected underlay graphic and ambient light conditions. Digital formation of overlay graphics by presenter/lecturer touch control command from a remote video panel also enables total storage and recall of multiple frames of complex overlay graphics with matching underlay graphics for reemphasis or for question and answer sessions between the lecturer and audience.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.