Patent ID: 6308444
Filing Date: 2001-10-30
Classification: F21S,F21V,F21Y,G02B,G09F,Y10S

Abstract:
In a light illuminated display board fabricated with a plurality of laminated transparent acrylic plastic plates, a plurality of lamps set along the edges of each of said plastic plates and controlled by a programmable logic controller (PLC), and a display board frame setting the laminated plastic plates, the lamps and the PLC therein in cooperation with a back plate, the improvement comprising:the plastic plates laminated, with a plurality of packings positioned in laminated junctions between the plastic plates at corners of the plates so as to form a space in said laminated junctions, said plastic plates being also precisely cut at their edges to form specifically angled and segmented edge surfaces individually having two to five surface segments, with a plurality of edge color sheets being attached to the surface segments so as to allow desired letters, figures, symbols or a combination of them to be illuminated by desired color light beams while being displayed on a display surface, said desired letters, figures or symbols being formed by inscribing outline grooves of the letters, figures or symbols, having a V-shaped cross-section, on a rear surface of a first plastic plate, and by scratching a rear surface of a middle plastic plate at areas corresponding to closed areas within said outline grooves, and by attaching a plurality of specifically cut color sheets, having shapes corresponding to profiles of the scratched areas, to both a front surface of said middle plastic plate and a rear surface of a last plastic plate at positions corresponding to the scratched areas;a plurality of heat dissipating bodies set in gaps between the lamps and the angled and segmented edge surfaces of the plastic plates, with an air ventilation hole being longitudinally formed in each of said heat dissipating bodies; anda color reflection plate attached to the rear surface of said last plastic plate at a junction between said last plastic plate and the back plate,whereby said plastic plates are laminated together, with the outline grooves, the scratched areas and the specifically cut color sheets of the plastic plates being precisely aligned with each other.