Low-loss face diffuser films for backlit signage and methods for using same
US6282821A · kind A · utility
42Cited by
22References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1998 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Jun 25, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31692
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A low-loss, diffuser film is provided for translucent surface(s) of lighted signage. The film has little absorptivity and has partial transmissivity and partial reflectivity. Luminance efficiency and brightness are significantly improved over conventional films used in backlit signage. A luminance efficiency prediction equation is also provided to aid in selection of diffuser films and interior surfaces of the lighted sign cavity. A combination of effects of diffuser films and a diffuse reflective films lining the interior surfaces of the lighted sign cavity is unexpectedly greater than their sum of effects operating alone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.