Sunlight readable display structure

Details Sunlight readable display structure Sunlight readable display structure

G - Physics

09

F

G09F 9/33 (2006.01) G09F 13/04 (2006.01) G09F 13/00 (2006.01)

Patent

CA 2059157

SUNLIGHT READABLE DISPLAY STRUCTURE ABSTRACT OF THE DISCLOSURE Sunlight readable display structure includes a layered structure formed of a reflective element, an LED light source, a colored filter, a legend plate, and a liquid crystal shutter. The reflective element is positioned behind the LED light source. The light source is formed of an LED array having a diffusion medium disposed in front of the LED array for scattering light when energized. The liquid crystal shutter permits displayable information on the legend plate to be viewed only when the LED array and the liquid crystal shutter are energized. The reflective element and the diffusion medium reflect and scatter incident sunlight which is passed through the liquid crystal shutter, legend plate and colored filter back through the colored filter and legend plate and out the liquid crystal shutter. The colored filter is preferably selected to have certain spectral transmission characteristics. As a result, the contrast of the displayable information on the legend plate is enhanced and is unaffected by washout to a viewer located in the area of incident sunlight.

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