Light emitting device
A light emitting device emitting an output light includes an optical structure. A sub light is defined as the output light corresponding to an azimuth angle, a first value L 1 is a sum of a luminance of the sub light corresponding to a polar angle from 115 to 125 degrees, a second value L 2 is a sum of a luminance of the sub light corresponding to a polar angle from 95 to 105 degrees, a third value L 3 is a sum of a luminance of the sub light corresponding to a polar angle from 75 to 85 degrees, a fourth value L 4 is a sum of a luminance of the sub light corresponding to a polar angle from 55 to 65 degrees. The first value L 1 , the second value L 2 , the third value L 3 and the fourth value L 4 satisfy L 3 ≠L 2 , and (L 2 +L 3 )>(L 1 +L 4 ).
1 . A light emitting device configured to emit an output light having a distribution of luminance, comprising:
an optical structure,
wherein the output light is adjusted by the optical structure, a sub light is defined as the output light corresponding to an azimuth angle, a first value L 1 is a sum of a luminance of the sub light corresponding to a polar angle from 115 degrees to 125 degrees, a second value L 2 is a sum of a luminance of the sub light corresponding to a polar angle from 95 degrees to 105 degrees, a third value L 3 is a sum of a luminance of the sub light corresponding to a polar angle from 75 degrees to 85 degrees, a fourth value L 4 is a sum of a luminance of the sub light corresponding to a polar angle from 55 degrees to 65 degrees, and the first value L 1 , the second value L 2 , the third value L 3 and the fourth value L 4 satisfy following relations:
L
3
≠
L
2
;
and
(
L
2
+
L
3
)
>
(
L
1
+
L
4
)
.
2 . The light emitting device of claim 1 , further comprising a plurality of light emitting units configured to emit a light, wherein the light passes through the optical structure to form the output light.
3 . The light emitting device of claim 2 , wherein the optical structure comprises a plurality of light blocking elements and an insulating layer disposed in a space between two adjacent light blocking elements of the plurality of light blocking elements.
4 . The light emitting device of claim 3 , wherein an extending direction of one of the plurality of light blocking elements is different from a top view direction of the light emitting device.
5 . The light emitting device of claim 2 , wherein one of the plurality of light emitting units comprises a diode.
6 . The light emitting device of claim 5 , wherein the diode is an inorganic diode.
7 . The light emitting device of claim 6 , wherein the diode comprises at least one semiconductor.
8 . The light emitting device of claim 5 , wherein the diode is an organic diode.
9 . The light emitting device of claim 2 , further comprising a display panel, wherein the optical structure is disposed between the display panel and the plurality of light emitting units.
10 . The light emitting device of claim 9 , wherein the optical structure comprises a base and a plurality of directional elements disposed on a surface of the base, and an extending direction of one of the plurality of directional elements is inclined from the surface of the base.
11 . The light emitting device of claim 9 , wherein one of the plurality of light emitting units comprises a diode.
12 . The light emitting device of claim 11 , wherein the diode is an inorganic diode.
13 . The light emitting device of claim 12 , wherein the diode comprises at least one semiconductor.
14 . The light emitting device of claim 1 , wherein the optical structure comprises a liquid crystal layer.
15 . The light emitting device of claim 1 , wherein the optical structure is a lens.