Flat lighting assembly apparatus including flat lighting module

1. A flat lighting assembly apparatus comprising:

a first flat lighting module and a second flat lighting module which are separated from each other and each include:

a frame including a base and an extension portion extending from the base;

a light source placed on the base, wherein the light source includes a plurality of light emitting devices; and

a diffusion plate placed on the light source,

wherein a light emitting device that is the closest to the extension portion among the plurality of the light emitting devices of the light source is disposed separately from the extension portion at a predetermined interval;

a ceiling member to which a connector of the first flat lighting module and the second flat lighting module is coupled; and

a power supply controller disposed within the ceiling member,

wherein the light emitting devices include an LED, and

wherein the connector is electrically connected to a socket disposed on the rear side of the base in order to supply electric power from the outside to the light source and includes a coupling unit coupled to at least one guide disposed around the socket.

2. The flat lighting assembly apparatus of claim 1 , wherein the light emitting device closest to the extension portion emits light toward the diffusion plate directly.

3. The flat lighting assembly apparatus of claim 1 , wherein the predetermined interval is at least 5 mm.

4. The flat lighting assembly apparatus of claim 1 , wherein a surface of the extension portion is inclined at an acute angle with respect to a line extended from the surface of the base.

5. The flat lighting assembly apparatus of claim 4 , wherein the acute angle is between 65° and 75°.

6. The flat lighting assembly apparatus of claim 1 , wherein the frame comprises a reflective material coated on an inner surface of the extension portion.

7. The flat lighting assembly apparatus of claim 1 , wherein the extension portion of the frame comprises at least one locking hole, wherein the diffusion plate comprises at least one locking projection disposed on the edge thereof, and wherein the locking projection of the diffusion plate is coupled to the locking hole of the extension portion of the frame.

8. The flat lighting assembly apparatus of claim 7 , wherein the locking projection of the diffusion plate is inserted and coupled to the locking hole of the extension portion of the frame in a direction from the inside to the outside of the extension portion.

9. The flat lighting assembly apparatus of claim 1 , wherein each of the first and second flat lighting modules further comprises a heat radiation sheet disposed between the light source and the base of the frame.

10. The flat lighting assembly apparatus of claim 1 , wherein each of the first and second flat lighting modules further comprises:

a socket disposed on the rear side of the base for the purpose of supplying electric power to the light source;

at least one guide disposed around the socket; and

a connector being electrically connected to the socket in order to supply electric power from the outside and including a coupling unit coupled to the guide.

11. The flat lighting assembly apparatus of claim 10 , wherein the socket is disposed around the center portion of the base, and wherein the socket and the connecter are connected with each other by using a push-pull method.

12. The flat lighting assembly apparatus of claim 10 , wherein a plurality of the guides are provided and the guides have mutually different shapes from each other.

13. The flat lighting assembly apparatus of claim 10 , wherein a plurality of the guides are provided and the guides have cylindrical shapes having mutually different diameters from each other.

14. The flat lighting assembly apparatus of claim 10 , wherein a distance from a first end to a second end of the guide is greater than a distance from a first end to a second end of the socket measured perpendicularly to the base.

15. The flat lighting assembly apparatus of claim 10 , wherein the guide is formed to project from the rear side of the base, and wherein the coupling unit has a shape into which the projecting guide is inserted.

16. The flat lighting assembly apparatus of claim 1 , wherein the diffusion plate is at least thicker than the substrate of the light source.

17. The flat lighting assembly apparatus of claim 1 , wherein each of the first and second flat lighting modules further comprises a reflection plate including a plurality of holes and being disposed on the light source such that the plurality of the light emitting devices are disposed in the plurality of the holes respectively so that light from the light emitting devices is exposed.

18. The flat lighting assembly apparatus of claim 1 , wherein the diffusion plate is spaced apart from and over the light source such that a light spot of the light emitted from the light emitting devices is not generated at least in the diffusion plate.