Patent ID: 7762704

Claim:
An edge-lit sign comprising a solid panel of optical transmission medium having a first surface, a second surface opposite the first surface, and a plurality of edges; the plurality of edges including at least one illuminated edge and at least one unlit edge; each of the at least one unlit edge being coated with a coating that prevents light emission therefrom; a light source provided along the at least one illuminated edge, said light source transmitting light into the panel through the at least one illuminated edge; an extractor pattern formed on at least one of the first surface or the second surface of the panel, said extractor pattern comprising extractor pixels, said extractor pixels causing light transmitted in the panel to emit from the panel; the extractor pixels per unit area varying with distance from the at least one illuminated edge to achieve a substantially spatially uniform intensity of light emitted from the panel; the extractor pixels corresponding to pixels of a binary image derived from a dithered grayscale image, the darkness of the grayscale image increasing with distance from the light source.