Lighting board using cassette light unit

1. A lighting board, comprising:

(1) a cassette light unit, having a top layer electrode plate, a bottom layer electrode plate, and a transparent head, said top layer electrode plate having a flat surface wherein partial areas of the surface are exposed;

(2) a receptacle substrate, having a first metal electrically coupled with said top layer electrode plate through said exposed areas, a second metal parallel with said first metal and electrically coupled with said bottom layer electrode plate, said first metal having an open area for light emitting;

(3) a lateral slot between said first metal and second metal for insertion of said light unit; and

(4) an insulating material between said first metal and said second metal.

2. The lighting board as claimed in claim 1 , wherein said lighting board is a strip shaped lighting board with a plurality of cassette light units arranged in a line.

3. The lighting board as claimed in claim 1 , wherein said lighting board is a matrix lighting board with a plurality of cassette light units arranged in a matrix.

4. The lighting board as claimed in claim 1 , wherein said transparent head is a layer of protection glue.

5. The lighting board as claimed in claim 1 , wherein said transparent head is of a shape selected from the group consisting of: animal, plant, natural scenery, and articles.

6. A cassette light unit, comprising:

(1) a light-emitting diode chip, having a first electrode and a second electrode;

(2) a top layer electrode plate electrically coupled with said first electrode and having a flat surface wherein at least partial areas of the surface are exposed;

(3) a bottom layer electrode plate electrically coupled with said second electrode, said top layer electrode plate having an open area for mounting said light-emitting diode chip onto said bottom layer electrode plate;

(4) an insulating material between said top layer electrode plate and said bottom layer electrode plate; and

(5) a transparent head formed over said light-emitting diode chip.

7. The cassette light unit of claim 6 , wherein the transparent head extends from the bottom layer electrode plate upwardly beyond a topmost surface of the top layer electrode plate.

8. The lighting board of claim 1 , wherein the first metal includes at least an elastic cantilever that contacts the top layer electrode plate and holds the cassette light unit down against the second metal for fixing the cassette light unit in place after the cassette light unit has been inserted in the slot.

9. The lighting board of claim 8 , wherein said elastic cantilever is bent downward toward the second metal for elastically holding the cassette light unit in place.

10. The lighting board of claim 1 , wherein said first metal includes two elastic cantilevers that are bent downward toward the second metal for contacting the top layer electrode plate and elastically holding the cassette light unit down against the second metal for fixing the cassette light unit in place after the cassette light unit has been inserted in the slot;

at least one of said elastic cantilevers is electrically coupled with the top layer electrode plate; and

said elastic cantilevers are spaced from one another to define therebetween the open area in which the transparent head of the cassette light unit is received.

11. A lighting board, comprising:

a cassette light unit that includes

an LED chip,

top and bottom layer electrode plates electrically coupled to respective terminals of the LED chips, and

a transparent head formed over the LED chip;

a receptacle substrate that includes

first and second metals spaced from each other by a spacing in which the cassette light unit is removably insertable so that the top and bottom layer electrode plates are (i) sandwiched between the first and second metals and (ii) in electrical contact with the first and second metals, respectively; and

an insulating material between said first and said second metals;

wherein said first metal has a cut-out portion defining an open area in which the transparent head is received when the cassette light unit is inserted into the receptacle.

12. The lighting board of claim 11 , wherein the first metal includes at least an elastic arm supported in cantilever fashion by the insulating material,

said elastic arm contacting the top layer electrode plate and elastically pressing the cassette light unit down against the second metal for fixing the cassette light unit in place after the cassette light unit has been inserted in the receptacle.

13. The lighting board of claim 12 , wherein said elastic arm is bent downward toward the second metal for elastically holding the cassette light unit in place.

14. The lighting board of claim 11 , wherein

said first metal includes two elastic arms supported in cantilever fashion by the insulating material, said arms being bent downward toward the second metal for contacting the top layer electrode plate and elastically holding the cassette light unit down against the second metal for fixing the cassette light unit in place after the cassette light unit has been inserted in the receptacle;

at least one of said elastic arms is in electrical contact with the top layer electrode plate; and

said elastic arms are spaced from one another to define therebetween the open area in which the transparent head of the cassette light unit is received.

15. The lighting board of claim 14 , wherein the first metal is U-shaped.

16. The cassette light unit of claim 11 , wherein, when after the cassette light unit has been inserted in the receptacle, the transparent head extends from the bottom layer electrode plate upwardly beyond topmost surfaces of both the top layer electrode plate and the first metal.

17. The cassette light unit of claim 16 , wherein, when after the cassette light unit has been inserted in the receptacle, the entirety of said cassette light unit, except said transparent head, is received in the spacing between said first and second metals.