Passively illuminated, eye-catching display for traffic signs

Details Passively illuminated, eye-catching display for traffic signs Passively illuminated, eye-catching display for traffic signs

2005-05-24

2005-05-24

Tweel, John (Department: 2632)

Communications: electrical

Visual indication

C345S058000

Reexamination Certificate

active

06897786

ABSTRACT:
Low-cost, low energy, programmable and remotely activatable traffic signs, particularly suitable for roadside, waterside or comparable use, which signs can display a variety of messages or images, for example warnings and directions, employ electropolymeric shutter arrays in front of retroreflective materials (32). The signs employ daylight or other passive 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 the attention-getting display, e.g. flashing.

REFERENCES:
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patent: 4564836 (1986-01-01), Vuilleumier et al.
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patent: 5892461 (1999-04-01), Dokko
patent: 6057814 (2000-05-01), Kalt
patent: 6204778 (2001-03-01), Bergan et al.
patent: 6317108 (2001-11-01), Kalt

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