Serpentine fluorescent lamp with shaped corners providing uniform backlight illumination for displays
US7042147B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2003 |
| Grant date | May 9, 2006 |
| Priority date | — |
| Expiry date | May 30, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133604
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A bent fluorescent lamp for backlighting a display providing uniform illumination. A fluorescent lamp is made from a tubular glass envelope having right angles formed therein with shaped corners. The right angles provide improved illumination of a plane surface for backlighting a liquid crystal display. The right angles and shaped corners eliminate dark regions in the illuminated surface. A right-angled bend is also formed at the ends of the fluorescent lamp. An electrode is positioned sufficiently far from a central portion of the lamp so that any dark spaces in the gas discharge of the fluorescent lamp, such as the Faraday dark space associated with a cathode of a lamp are not formed within the central portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.