Electroluminescent lamp with controlled field intensity for displaying graphics
US5660573A · kind A · utility
Inventor
Key dates
| Filing date | Aug 16, 1995 |
| Grant date | Aug 26, 1997 |
| Priority date | — |
| Expiry date | Aug 16, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B33/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An EL lamp includes a transparent electrode, an electroluminescent dielectric layer overlying the transparent electrode, a patterned insulating layer overlies selected portions of the dielectric layer for reducing the electric field across the selected portions of the electroluminescent dielectric layer, and a rear electrode overlying the insulating layer and the electroluminescent dielectric layer. The insulating layer is preferably a low dielectric constant material and can overlie the electroluminescent dielectric layer or can be located between a separate dielectric layer and a phosphor layer. A gray scale is produced by depositing or printing more than one thickness of insulating layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.