Title:
PASSIVELY ILLUMINATED, EYE-CATCHING DISPLAY FOR TRAFFIC SIGNS
Document Type and Number:
WIPO Patent Application WO2001096666
Kind Code:
A3
Abstract:
Low-cost, programmable and remotely activatable traffic signs (10), particularly suitable for roadside use, which can display a variety of messages or images, for example warnings and directions, employ electropolymeric shutter arrays (16, 18) in front of retroreflective materials (32) (32). The signs employ daylight or other illumination external to the sign, such as vehicle headlights, to yield high contrast images with good visibility. Optional features include attention-getting effects such as flashing, economical solar power means and means to detect vehicle approach to initiate an attention-getting display, e.g. flashing.
Inventors:
KALT CHARLES G (US)
SLATER MARK S (US)
SLATER MARK S (US)
Application Number:
PCT/US2001/018985
Publication Date:
June 06, 2002
Filing Date:
June 13, 2001
Export Citation:
Assignee:
DISPLAY SCIENCE INC (US)
KALT CHARLES G (US)
SLATER MARK S (US)
KALT CHARLES G (US)
SLATER MARK S (US)
International Classes:
G02B5/128; G08G1/095; G09F9/33; G02B26/02; (IPC1-7): G08B5/00
Foreign References:
| US6057814A | 2000-05-02 | |||
| US4082426A | 1978-04-04 | |||
| US5892461A | 1999-04-06 | |||
| US3154872A | 1964-11-03 | |||
| US4564836A | 1986-01-14 | |||
| US5231559A | 1993-07-27 | |||
| US6204778B1 | 2001-03-20 |
Other References:
See also references of EP 1312058A4
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