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A light transmitting, visual display panel for use as a sign or message board and comprised of a plurality of closely adjacent, rectangular modules, each of which includes a closed, vertically disposed housing having top, bottom, side and back walls, and a front wall comprised of a plurality of clos

A light transmitting, visual display panel for use as a sign or message board and comprised of a plurality of closely adjacent, rectangular modules, each of which includes a closed, vertically disposed housing having top, bottom, side and back walls, and a front wall comprised of a plurality of closely adjacent, interchangeable, rectangular, 3-dimensional, light refracting filtering lenses. The lenses are removably secured in the housing. A vertical array of individual light sources is disposed within the housing behind the lenses and dividers behind the lenses separate the light sources. Each housing includes at least one pressurizing cooling fan and narrow, slot-like air exhaust ducts are provided between adjacent lenses.

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1. A light transmitting visual display panel comprised of a plurality of closely adjacent rectangular modules, each of said modules comprising: A) a closed vertically disposed housing having top, bottom, side and back walls, and a front wall comprised of a plurality of closely adjacent interchang

1. A light transmitting visual display panel comprised of a plurality of closely adjacent rectangular modules, each of said modules comprising: A) a closed vertically disposed housing having top, bottom, side and back walls, and a front wall comprised of a plurality of closely adjacent interchangeable rectangular three-dimensional filtering lenses, each of said lenses having a top edge and a bottom lip, B) means for removably securing said lenses in said housing, C) a vertical array of individual light sources disposed within the housing behind said lenses, D) dividers behind said lenses separating said light sources, said dividers including horizontal louvers supported at their ends in said housing and extending forwardly from the lenses, said louvers each including on one side a longitudinal channel intermediate between the forward and rearward edges and on the other side a corresponding longitudinal projection, the top edges of said lenses being engageable in said channel of one louver and the bottom lips of said lenses being engageable against the projection of the next adjacent lower louver, E) at least one pressurizing cooling fan in the housing, and F) narrow slot-like air exhaust ducts between adjacent lenses. 2. A visual display panel according to claim 1 wherein each of said filtering lenses comprises: A) a body having an open back, B) a flat front wall member having 1) on the outside surface a plurality of narrow adjacent horizontal prisms adapted to refract light to an angle below horizontal, and 2) on the inside surface a plurality of narrow adjacent vertical horizontal beam spread controlling prisms, and C) side and bottom wall members extending rearwardly from said front lens member. 3. A visual display panel according to claim 2 wherein said side and bottom lens wall members are flat and inclined angularly outwardly from the front lens member, and have pillow prisms on the inside and outside surfaces. 4. A visual display panel according to claim 3 wherein: A) vertical flanges extend rearwardly from the inclined side wall members of said lens, B) vertically spaced apart horizontal ribs project inwardly on the inside surfaces of said flanges, and C) at least one horizontal rib projects outwardly on the outside surface of one of said flanges, and at least a pair of vertically spaced apart horizontal ribs displaced vertically from said other outside horizontal rib project outwardly on the outside surface of the other of said flanges to provide said slot-like exhaust ducts between adjacent lenses. 5. A visual display panel according to claim 4 wherein: A) vertical and horizontal dividers separate said light sources, B) the forward edges of said vertical dividers are bifurcated and spreadable, and C) said spreadable divider members engage said inside flange ribs of adjacent lenses to provide an air passage between the divider and flange. 6. A visual display panel according to claim 2 wherein said lens body is composed of pigmented polycarbonate or acrylic synthetic resin. 7. A visual display panel according to claim 2 wherein the flat front wall lens member extends angularly inwardly from top to bottom. 8. A visual display panel according to claim 1 wherein: A) each of said lenses includes a pair of horizontally spaced apart horizontal baffles forming a partial top wall of said lens, and B) each of said louvers includes at least one hole in the area of the louver overlying said baffles. 9. A visual display panel according to claim 1 wherein said light sources are incandescent bulbs. 10. A visual display panel according to claim 9 wherein: A) some of said lenses are blue in color, and B) at least some of the bulbs behind said blue lenses are of higher intensity than the remaining bulbs. 11. A visual display panel according to claim 1 wherein said light dividers include generally parabolic reflectors around said light sources.