Electroluminescent display and luminous timepiece dial
US5838644A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1995 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Oct 27, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B19/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electroluminescent display which is simple to manufacture and which is capable of high luminance consists of a transparent electrode disposed on a transparent substrate. On the transparent electrode are sequentially laminated layers including a fluorescent print pattern layer, a luminescent layer, an insulating layer and a rear electrode layer. The fluorescent layer is preferably formed of a fluorescent pigment and a fluoride resin binder and is provided at a portion of the electroluminescent display at which a display is to be created, such as the time indicating indicia on the dial of a timepiece. In a preferred embodiment, the electroluminescent display is provided as a timepiece dial and has a central hole therethrough for providing shafts for driving an hour hand, a minute hand and a second hand. Upon application of an electric field between the display electrodes, portions of the luminescent layer other than those which correspond to the time indicia emit light with a luminescent color dependent upon the material of the luminescent layer. The luminescent color becomes the background color of the dial. The time indicia portion formed of the patterned fluorescent layer produ…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.