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United States of America Patent
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Apr 24, 2001
Grant Date -
N/A
app pub date -
Apr 20, 1999
filing date -
Nov 17, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An array of disks facing a viewing direction is composed of disks rotatable about an axis approximately perpendicular to the viewing direction between alternating orientations where light and dark surfaces are respectively displayed in the viewing direction. There is provided a row of LEDs located forwardly of the array and out of the normal viewing path located to illuminate the disks of said array. Masking means prevents direct illumination from said LED's being visible in the viewing direction. In a further variant the disks' light surfaces contain a fluorescent component and the LEDs are selected to provide radiation including UV spectra.
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