Display apparatus for signage
US5793343A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1996 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | Nov 6, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/0278
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A portable display signage for all weather and ambient lighting conditions has dual matrices of character generating elements. One matrix is provided by a multiplicity of passive display units arranged in an array for cooperatively displaying graphics or characters. Each of the passive display elements comprises a flat disk having a reflective side and a non-reflective side. An electromagnet on each display element rotates the disk to display its reflective or non-reflective side to form an information display from the first matrix. The second matrix is formed from active display elements including light emitting diodes arranged in an array for cooperatively displaying graphics or characters. Each active display element is co-located with a passive display element to form a set and are positioned to be visible between gaps in the first matrix. A display is built from a plurality of modules containing subsets of the two matrices. Each module is based on a printed circuit board which mounts both subsets of the matrix elements and which has circuit elements controlling the matrix elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.