Display device and manufacturing method thereof

1. A display device comprising:

a light source which generates light;

a light guide member which guides the light; and

a light collecting member which is disposed on the light guide member to collect the light provided from the light guide member, and comprises:

a first insulation layer disposed on the light guide member and comprising a plurality of central areas, a plurality of ring areas respectively surrounding the plurality of central areas, and a peripheral area which surrounds the plurality of ring areas, and is spaced farther than the plurality of central areas from the light guide member, wherein the plurality of ring areas connects the peripheral area to the plurality of central areas, wherein a first cavity is defined as a space surrounded by the light guiding member, the peripheral area, and the plurality of ring area and a second cavity is defined as a recessed space in the direction from the peripheral area to the light guide member;

a plurality of insulation patterns disposed on the first insulation layer and disposed inside the plurality of second cavities; and

a plurality of optical lenses which is disposed on the plurality of insulation patterns and each of which overlaps a portion of the plurality of central areas, a portion of the plurality of ring areas, and the peripheral area, and includes an upwardly convex surface,

wherein the first insulation layer has a refractive index greater than that of each of the plurality of insulation patterns.

2. The display device of claim 1 , wherein each of the plurality of insulation patterns has a truncated cone shape having a diameter gradually decreasing from a lower portion of the plurality of insulation patterns to an upper portion of the plurality of insulation patterns,

each of the plurality of insulation patterns has a trapezoidal shape on a cross-section, and

each of side surfaces of the plurality of insulation patterns defines an angle of about 60° with respect to the light guide member on the cross-section.

3. The display device of claim 2 , wherein, in a plan view, the plurality of optical lenses overlaps central points of the plurality of insulation patterns, respectively.

4. The display device of claim 1 , wherein each of the plurality of optical lenses has a dome shape, and

each of the plurality of optical lenses has a circular shape in a plan view.

5. The display device of claim 4 , wherein when a diameter of a bottom surface of each of the plurality of optical lenses is defined as A, and a largest distance among distances from a central point of the bottom surface of each of the plurality of optical lenses to a top surface of each of the plurality of optical lenses is defined as B, a ratio of B to A is equal to or greater than about 0.3.

6. The display device of claim 4 , wherein each of the plurality of central areas overlaps at least two optical lenses among the plurality of optical lenses,

the light guide member includes a first side surface and a second side surface facing the first side surface,

the light source is disposed adjacent to the first side surface, and

the display device further comprises a reflective plate disposed adjacent to the second side surface in the light guide member to reflect the light toward the first side surface.

7. The display device of claim 1 , wherein each of the plurality of optical lenses has a semi-cylindrical shape having a rectangular shaped bottom surface including a long side parallel to a first direction and a short side parallel to a second direction perpendicular to the first direction,

each of the plurality of optical lenses overlaps a portion of central areas, which are arranged in the first direction, among the plurality of central areas, and

the light source emits the light in the second direction.

8. The display device of claim 1 , wherein the light collecting member further comprises a second insulation layer disposed below the first insulation layer and disposed in the first cavity, and

the second insulation layer has a refractive index less than that of each of the first insulation layer and the light guide member.

9. The display device of claim 8 , further comprising a metal layer which is disposed between the second insulation layer and the light guide member to reflect the light downward.

10. The display device of claim 9 , wherein the first insulation layer has a refractive index equal to or greater than about 1.7.

11. The display device of claim 8 , wherein the first insulation layer further comprises an inorganic material, the second insulation layer comprises an organic material, and each of the plurality of insulation patterns comprises an organic material.

12. The display device of claim 1 , wherein the light collecting member further comprises a planarizing layer extending upward from the plurality of insulation patterns, parallel to the light guide member, and comprising an organic material, and the planarizing layer is unitary with the plurality of insulating patterns.

13. The display device of claim 12 , wherein the light collecting member further comprises a second insulation layer disposed below the first insulation layer and disposed in the first cavity, and

the first insulation layer has a thickness equal to or greater than about 0.6 micrometer and equal to or less than about 1.0 micrometer, and each of bottom surfaces of the plurality of ring areas has a width less than a height of the second insulation layer.

14. The display device of claim 12 , wherein air is contained in the first cavity, a plurality of through-holes are defined in the peripheral area, and

the air contacts the planarizing layer through the plurality of through-holes.

15. The display device of claim 1 , wherein the light is reflected toward top surfaces of the plurality of ring areas by bottom surfaces of the plurality of ring areas, and the light reflected toward the top surfaces of the plurality of ring areas is refracted by the top surfaces of the plurality of ring areas to pass through the plurality of optical lenses.

16. The display device of claim 1 , the plurality of optical lenses which is correspondingly disposed on and overlaps less than an entire portion of the plurality of insulation patterns and each of which overlaps less than an entire portion of the plurality of central areas, less than an entire portion of the plurality of ring areas, and the peripheral area.