Billboard with light assembly for substantially uniform illumination

摘要

A billboard includes a support structure and a display surface mounted on the support structure. A first lighting assembly is mounted on the support structure and includes LEDs directed toward the display surface so that the first lighting assembly can illuminate a first portion of the display surface. A second lighting assembly is also mounted on the support structure and also includes LEDs directed toward the display surface so that the second lighting assembly can illuminate a second portion of the display surface. The first portion and the second portion constitute the entire display surface. The entire display surface can be uniformly illuminated using only the first lighting assembly and the second lighting assembly such that the light intensity across the display surface is provided with a uniformity that achieves a 3:1 ratio of average illumination to minimum illumination.

主权项

1. A billboard comprising:
a support structure; a display surface mounted on the support structure, the display surface having a width of forty-eight feet along an upper edge and a lower edge of the display surface and a height of fourteen feet along a left side edge and a right side edge of the display surface, the display surface comprising a first portion extending from the lower edge to the upper edge near the left side edge and a second portion extending from the lower edge to the upper edge near the right side edge, the first and second portions together extending from the left side edge to the right side edge; a walkway attached to the support structure adjacent the lower edge of the display surface, wherein an uppermost surface of the walkway is vertically spaced at a distance lower than a lowermost portion of the display surface; a first lighting assembly that includes a plurality of light emitting diodes (LEDs) and a plurality of optical elements, wherein each optical element is disposed over only one associated LED, the optical elements each including a first portion, a second portion and a third portion arranged to direct light toward the display surface so that each LED of the first lighting assembly can illuminate the first portion of the display surface, wherein all of the LEDs of the first lighting assembly are mounted in a single assembly attached to the walkway, the first lighting assembly including a first heat sink; and a second lighting assembly that includes a plurality of LEDs and a plurality of optical elements, wherein each optical element is disposed over only one associated LED, the optical elements each including a first portion, a second portion and a third portion arranged to direct light toward the display surface so that each LED of the second lighting assembly can illuminate the second portion of the display surface, the first portion and the second portion comprising all of the display surface, wherein all of the LEDs of the second lighting assembly are mounted in a single assembly attached to the walkway, the second lighting assembly including a second heat sink, wherein all of the display surface can be illuminated using only the first lighting assembly and the second lighting assembly.