Passively illuminated, eye-catching display for traffic signs
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United States of America Patent
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May 24, 2005
Grant Date -
N/A
app pub date -
Jun 14, 2000
filing date -
Jun 14, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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Cited Art Landscape
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