Light-emitting device having dissimilar first and second light-emitting angles
A light-emitting device includes a light-emitting structure with a side surface, and a reflective layer covering the side surface. The light-emitting structure has a first light-emitting angle and a second light-emitting angle. The difference between the first light-emitting angle and the second light-emitting angle is larger than 15°.
1. A display unit comprising:
a carrier;
a light guide plate;
a light-emitting device, comprising:
a light-emitting structure with a side surface, arranged between the carrier and the light guide plate;
a light-transmitting body enclosing the light-emitting structure and having a first side surface, a second side surface, a third side surface and a fourth side surface; and
a reflective layer covering the side surface, the first side surface and the third side surface without covering the second side surface and the fourth side surface; and
a diffusing plate arranged on the light guide plate; wherein the light-emitting device has a first light-emitting angle and a second light-emitting angle different from the first light-emitting angle.
2. The display unit according to claim 1 , wherein the light-transmitting body has a top surface and a bottom surface opposite to the top surface, and the light-emitting device comprises a pair of extension electrode layers disposed on the bottom surface.
3. The display unit according to claim 1 , wherein the first side surface is opposite to the third side surface and the second side surface is opposite to the fourth side surface.
4. The display unit according to claim 1 , wherein the first light-emitting angle is of 130˜150°.
5. The display unit according to claim 1 , wherein the second light-emitting angle is of 100˜125°.
6. The display unit according to claim 1 , wherein the light-emitting device has merely three light-emitting surfaces.
7. The display unit according to claim 1 , further comprising an extension electrode layer overlapping the reflective layer.
8. The display unit according to claim 1 , further comprising an extension electrode layer having a side surface coplanar with the reflective layer.
9. The display unit according to claim 2 , wherein the reflective layer has an inner surface with a first portion inclined with respect to the top surface and a second portion substantially perpendicular to the top surface.
10. The display unit according to claim 9 , wherein the first portion has a height larger than that of the light-emitting structure.
11. The display unit according to claim 1 , wherein the first side surface has a portion uncovered by the reflective layer.
12. The display unit according to claim 1 , wherein the light-transmitting body has a top surface, and the reflective layer has an inner surface inclined with respect to the top surface.
13. The display unit according to claim 1 , further comprising another reflective layer covering a bottom surface of the light-transmitting body.
14. The display unit according to claim 1 , further comprising another reflective layer covering the light-emitting structure.
15. The display unit according to claim 1 , further comprising a reflector arranged below the light guide plate.
16. The display unit according to claim 15 , wherein the light guide plate is arranged between the diffusing plate and the reflector.
17. The display unit according to claim 15 , wherein the reflector has a length larger than that of the light guide plate.
18. The display unit according to claim 15 , wherein the reflective layer is arranged between the reflector and the diffusing plate.
19. The display unit according to claim 1 , wherein the diffusing plate is arranged above the light-emitting structure.
20. The display unit according to claim 1 , wherein the diffusing plate has a length not shorter than that of the light guide plate.