Efficient, uniform, and dimmable sign or display illumination methods using overlapped LED modules on a raised grid platform

An LED-illuminated sign or display unit design comprising:

• (a) a raised platform constructed with a plurality of flat plates or fins of certain heights which intersect with a first and second plate to form a grid-node, thus creating a plurality of grid-nodes at plurality of intersections that construct a two-dimensional array shaped as a square, rectangular, or any non-regular grid;
• (b) a plurality of LED sub-modules denoted as “horizontal-transverse-1” or “HT1” placed parallel to X axis of the two-dimensional array;
• (c) a plurality of LED sub-modules denoted as “horizontal-transverse-2” or “HT2” placed parallel to Y-axis of the two-dimensional array wherein these HT2 sub-modules are mounted over the HT1 sub-modules, following a rotation of 90 degrees with respect to the HT1 sub-modules and wherein the HT1 and HT2 sub-modules are electrically isolated from one another;
• (d) a plurality of composite LED modules, each shaped as a “plus-sign”, constructed from overlapped the HT1 and HT2 sub-modules wherein the composite LED modules are placed at each grid-node of the raised grid platform, which serves as a base for the LED lamp module assemblies when placed at the back of a sign or display, reducing the distance between the light source and the sign it illuminates.