Backlight assembly including light emitting diode and display device including the same
A light emitting diode is provided which includes an emitting portion on a base portion and a lens portion covering the emitting portion and having a slanted upper surface. The slanted upper surface has a reversed cone shape and has a slanted angle of about 55 to 85 degrees with respect to a center axis of the emitting portion.
1 . A light emitting diode, comprising:
an emitting portion on a base portion; and
a lens portion covering the emitting portion and having a slanted upper surface, wherein the slanted upper surface has a reversed cone shape and a slanted angle of about 55 to 85 degrees with respect to a center axis of the emitting portion.
2 . The diode according to claim 1 , wherein the lens portion has a refractive index of about 1.49 to 1.52.
3 . The diode according to claim 1 , wherein the lens portion includes polymethylmetharylate (PMMA) and silica.
4 . The diode according to claim 1 , further comprising a reflector coated on the slanted upper surface.
5 . A backlight assembly, comprising:
a plurality of light emitting diodes,
a reflecting sheet having a plurality of through holes corresponding to the plurality of light emitting diode; and
at least one optical sheet disposed directly over the plurality of light emitting diode.
6 . The assembly according to claim 5 , wherein at least one of the plurality of light emitting diodes comprise:
an emitting portion on a base portion; and
a lens portion covering the emitting portion and having an slanted upper surface, wherein the slanted upper surface has a reversed cone shape and has a slanted angle of about 55 to 85 degrees with respect to a center axis of the emitting portion;
7 . The assembly according to claim 6 , wherein the lens portion has a refractive index of about 1.49 to 1.52.
8 . The assembly according to claim 6 , wherein the lens portion includes polymethylmetharylate (PMMA) and silica.
9 . The assembly according to claim 6 , wherein the one of the plurality of light emitting diodes further includes a reflector coated on the slanted upper surface.
10 . The assembly according to claim 6 , wherein portions of the at least one optical sheet directly over the plurality of light emitting diode are transparent.
11 . A display device, comprising:
a display panel; and
a backlight assembly below the display panel
wherein the backlight assembly comprises:
a plurality of light emitting diodes;
a reflecting sheet having a plurality of through holes corresponding to the plurality of light emitting diodes; and
at least one optical sheet disposed directly over the plurality of light emitting diodes.
12 . The device according to claim 11 , wherein at least one of the plurality of light emitting diodes comprises:
an emitting portion on a base portion; and
a lens portion covering the emitting portion and having a slanted upper surface, wherein the slanted upper surface has a reversed cone shape and has a slanted angle of about 55 to 85 degrees with respect to a center axis of the emitting portion;
13 . The device according to claim 12 , wherein the at least one of the plurality of light emitting diode further includes a reflector coated on the slanted upper surface.
14 . The device according to claim 12 , wherein portions of the at least one optical sheet directly over at least a portion of the plurality of light emitting diode are transparent.
15 . The device according to claim 12 , wherein the display panel includes a liquid crystal panel.
16 . A backlight assembly, comprising:
a plurality of light emitting diodes,
wherein at least one of the plurality of light emitting diodes comprises:
an emitting portion on a base portion; and
a lens portion covering the emitting portion and having an slanted upper surface, wherein the slanted upper surface has a reversed cone shape such that the at least one of the plurality of light emitting diode has a highest luminous intensity at an angle of about 55 to 80 degrees with respect to a center axis of the emitting portion; and
at least one optical sheet disposed directly over the plurality of light emitting diode.
17 . The assembly according to claim 16 , wherein a ratio of the luminous intensity of light going directly upward and the highest luminous intensity is equal to or less than 0.02.
18 . The assembly according to claim 16 , wherein the slanted upper surface has a slanted angle of about 55 to 85 degrees with respect to a center axis of the emitting portion.
19 . The assembly according to claim 16 , wherein the at least one of the plurality of light emitting diodes further includes a reflector coat on the slanted upper surface