Multi-function keypad using colored light sources and optical films
US7523862B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2006 |
| Grant date | Apr 28, 2009 |
| Priority date | — |
| Expiry date | Dec 21, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A multi-function key system for use with an electronic device can include at least one key (230) and an optical film (255) optically coupled to the key. The optical film (255) can include a first optical filter (260) corresponding to a first color of light and a second optical filter (265) corresponding to a second color of light. The multi-function key system further can include a first light source (275), disposed below the key, that emits the first color of light and a second light source (280), disposed below the key, that emits the second color of light. A controller (215) can selectively activate the first light source (275) or second light source (280) responsive to an event detected within the electronic device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.