Light emitting device package and backlight unit using the same

A light unit, comprising:

• a plurality of light emitting devices on a substrate;
• a plurality of optical lenses disposed over the plurality of light emitting devices;
• and
• a diffusion plate disposed above the plurality of respective optical lenses,
• wherein a respective optical lens comprises:
• a body, the body comprising:
• a recessed portion having a curved surface and inwardly recessing towards a respective light emitting device;
• a rounded convex surface disposed around the recessed portion;
• a bottom surface facing a top surface of the substrate;
• and
• a lateral flat portion disposed between the rounded convex surface and the bottom surface, wherein the lateral flat portion extends from a bottom point of the rounded convex surface in a first direction substantially parallel with a central axis of the respective light emitting device;
• and
• an extending member extending from the body of the respective optical lens, wherein the extending member comprises:
• a first part laterally extending from the lateral flat portion of the body in a second direction substantially perpendicular to the central axis of the respective light emitting device;
• and
• a second part extending from the first part,
• wherein each of outermost lateral surfaces of the first and second parts is positioned farther than the lateral flat portion from the respective light emitting device,
• wherein the second part is disposed between the top surface of the substrate and a plane comprising the bottom surface of the body,
• wherein the recessed portion is disposed at a center of a top surface of the body, and
• wherein the second part is substantially symmetrical with respect to an axis that is spaced apart in the second direction from the central axis of the respective light emitting device and substantially parallel with the central axis of the respective light emitting device.

A display, comprising:

• a plurality of light emitting devices on a substrate;
• a plurality of optical lenses disposed over the plurality of light emitting devices;
• a diffusion plate disposed above the plurality of respective optical lenses;
• and
• a display panel disposed above the diffusion plate,
• wherein a respective optical lens comprises:
• a body, the body comprising:
• a recessed portion having a curved surface and inwardly recessing towards a respective light emitting device;
• a rounded convex surface disposed around the recessed portion;
• a bottom surface facing a top surface of the substrate;
• and
• a lateral flat portion disposed between the rounded convex surface and the bottom surface, wherein the lateral flat portion extends from a bottom point of the rounded convex surface in a first direction substantially parallel with a central axis of the respective light emitting device;
• and
• an extending member extending from the body of the respective optical lens,
• wherein the extending member comprises:
• a first part laterally extending from the lateral flat portion of the body in a second direction substantially perpendicular to the central axis of the respective light emitting device;
• and
• a second part extending from the first part,
• wherein each of outermost lateral surfaces of the first and second parts is positioned farther than the lateral flat portion from the respective light emitting device,
• wherein the second part is disposed between a top surface of the substrate and a plane comprising the bottom surface of the body,
• wherein the recessed portion is disposed at a center of a top surface of the body, and
• wherein the second part is substantially symmetrical with respect to an axis that is spaced apart in the second direction from the central axis of the respective light emitting device and substantially parallel with the central axis of the respective emitting device.