OPTICAL ASSEMBLY, BACKLIGHT UNIT HAVING THE SAME, AND DISPLAY APPARATUS THEREOF
The present invention provides an optical assembly, a backlight unit having the same, and a display apparatus thereof, and the optical assembly includes: a light emitting device; and a lens disposed above the light emitting device, and the lens has: a lower surface portion through which light emitted from the light emitting device travels inside; an upper surface portion that totally reflects at least some of the light traveling inside through the lower surface portion, downward to the side; and a side portion through which the light totally reflected from the upper surface portion is discharged to the outside.
1 . A backlight unit comprising a plurality of light sources,
wherein the light source includes:
a light emitting device; and
a lens disposed above the light emitting device, and the lens has:
a lower surface portion through which light emitted from the light emitting device travels inside;
an upper surface portion that totally reflects at least some of the light traveling inside through the lower surface portion, downward to the side; and
a side portion through which the light totally reflected from the upper surface portion is discharged to the outside.
2 . The backlight unit of claim 1 , wherein the lower surface portion of the lens has a shape recessed upward to cover the light emitting device.
3 . The backlight unit of claim 2 , wherein at least a portion of the lower surface portion of the lens has any one cross-sectional shape of a straight line, a triangle, a circle, and an ellipse.
4 . The backlight unit of claim 1 , wherein the upper surface portion of the lens has a shape recessed downward at the center portion.
5 . The backlight unit of claim 4 , wherein the depth of the upper surface portion is 0.3 or more times the distance from the center potion to the end of the upper surface portion.
6 . The backlight unit of claim 1 , wherein at least a portion of the upper surface portion of the lens has any one cross-sectional shape of a parabola, a circle, and an ellipse.
7 . The backlight unit of claim 6 , wherein the surface curvature of a parabola corresponding to the cross-sectional shape of the upper surface portion is ¼ to 4.
8 . The backlight unit of claim 1 , wherein the upper surface portion of the lens includes a plurality of light emission patterns having a shape that is convex upward.
9 . The backlight unit of claim 1 , wherein the side portion of the lens is inclined at a predetermined angle toward the inside the lens.
10 . The backlight unit of claim 1 , wherein the side portion of the lens is inclined at a predetermined angle outward from the lens.
11 . The backlight unit of claim 9 , wherein the inclination angle of the side portion of the lens is 0 degree to 45 degrees.
12 . The backlight unit of claim 1 , wherein at least a portion of the side portion of the lens has any one cross-sectional shape of a straight line, a circle, and an ellipse.
13 . The backlight unit of claim 1 , wherein the side portion of the lens includes a plurality of protrusion patterns that is convex outward.
14 . The backlight unit of claim 1 , wherein the lens includes a plurality of particles for diffusing light.
15 . The backlight unit of claim 1 , wherein the light source further includes a diffusion layer disposed at a lower side of the lens.
16 . The backlight unit of claim 1 , wherein the light source further includes a second lens disposed above the lens and adjusting light discharged through the upper surface portion of the lens.
17 . The backlight unit of claim 1 , wherein the light source further includes a light shielding layer disposed above the lens and the light shielding layer includes a plurality of patterns for transmitting or blocking light emitted through the upper surface portion of the lens.
18 . The backlight unit of claim 1 , further comprising a reflective sheet disposed under the light source and having a plurality of embossed or intagliated patterns.
19 . A display apparatus comprising:
a backlight unit including a plurality of light sources; and
a display panel disposed on the backlight unit,
wherein at least one of the plurality of light sources of the backlight unit includes:
a light emitting device; and
a lens disposed above the light emitting device, and the lens has:
a lower surface portion through which light emitted from the light emitting device travels inside;
an upper surface portion that totally reflects at least some of the light traveling inside through the lower surface portion, downward to the side; and
a side portion through which the light totally reflected from the upper surface portion is discharged to the outside.
20 . The display apparatus of claim 19 , wherein the lower surface portion of the lens has a shape recessed upward to cover the light emitting device.
21 . The display apparatus of claim 19 , wherein the upper surface portion of the lens has a shape recessed downward at the center portion.
22 . The display apparatus of claim 19 , wherein the side portion of the lens is inclined at a predetermined angle toward the inside the lens.
23 . The display apparatus of claim 19 , wherein the lens includes a plurality of particles for diffusing light.
24 . The display apparatus of claim 19 , wherein the light source further includes a diffusion layer disposed on the underside of the lens.
25 . The display apparatus of claim 19 , wherein the light source further includes a second lens disposed above the lens and adjusting light discharged through the upper surface portion of the lens.
26 . The display apparatus of claim 19 , further comprising an optical sheet disposed between the backlight unit and the display panel,
wherein the lens further includes at least one protrusion supporting the optical sheet.
27 . An optical assembly comprising:
a light emitting device; and
a lens disposed above the light emitting device, and the lens has:
a lower surface portion through which light emitted from the light emitting device travels inside;
an upper surface portion that totally reflects at least some of the light traveling inside through the lower surface portion, downward to the side; and
a side portion through which the light totally reflected from the upper surface portion is discharged to the outside.
28 . The optical assembly of claim 27 , wherein the lower surface portion of the lens has a shape recessed upward to cover the light emitting device.
29 . The optical assembly of claim 27 , wherein the upper surface portion of the lens has a shape recessed downward at the center portion.
30 . The optical assembly of claim 27 , wherein the side portion of the lens is inclined at a predetermined angle toward the inside the lens.