Edge-lit multiple image display device
US4949489A · kind A · utility
Inventors
Key dates
| Filing date | Jul 11, 1989 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Jul 11, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F2013/1868
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is disclosed an edge-lit multiple image display device. The device utilizes a plurality of internal-reflecting-light sheets which are provided in a stacked array. Images are formed on the surfaces of the sheets with a coating of a material that changes the density on the internally reflecting surface of its respective sheet. A light source is provided to illuminate the edges of the stacked array of sheets, with a light shield that can be moved to selectively direct the light to one edge at a time of the edges of the sheets in the stack. As the light shield is moved to selectively and alternatingly illuminate the edges of selected sheets in the stacked array, the images displayed on each of the edge-lit plates becomes illuminated, appearing and then disappearing as the light source is applied and then removed from the edge of its respective plate. This can be used to provide an animated display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.