Multi-channel visible light communication system
A multi-channel visible light communication system includes a carrier board and a plurality of light-emitting device stacks. The light-emitting device stacks are arranged over the carrier board. Each of the light-emitting device stacks includes a first light-emitting device, a second light-emitting device and a first adhesive layer. The second light-emitting device is disposed over the first light-emitting device. The first adhesive layer is disposed between the first light-emitting device and the second light-emitting device. The first adhesive layer includes a first metasurface. The first metasurface is configured to pass a first color light emitted from the first light-emitting device and reflect a second color light emitted from the second light-emitting device.
1 . A multi-channel visible light communication system, comprising:
a carrier board; and
a plurality of light-emitting device stacks arranged over the carrier board, wherein each of the plurality of light-emitting device stacks comprises:
a first light-emitting device;
a second light-emitting device, disposed over the first light-emitting device; and
a first adhesive layer, disposed between the first light-emitting device and the second light-emitting device, wherein the first adhesive layer comprises a first metasurface configured to pass a first color light emitted from the first light-emitting device and reflect a second color light emitted from the second light-emitting device, the first metasurface of the first adhesive layer comprises:
a first substrate; and
a plurality of first antennas protruding upward from the first substrate; and
a first refractive index matching layer covering upper surfaces and all side faces of the plurality of first antennas of the first metasurface.
2 . The multi-channel visible light communication system according to claim 1 , wherein each of the plurality of light-emitting device stacks further comprises:
a third light-emitting device, disposed over the second light-emitting device; and
a second adhesive layer, disposed between the second light-emitting device and the third light-emitting device, wherein the second adhesive layer comprises a second metasurface configured to pass the first color light emitted from the first light-emitting device and the second color light emitted from the second light-emitting device and reflect a third color light emitted from the third light-emitting device.
3 . The multi-channel visible light communication system according to claim 2 , wherein the first light-emitting device, the second light-emitting device and the third light-emitting device of each of the plurality of light-emitting device stacks are independently controlled.
4 . The multi-channel visible light communication system according to claim 2 , wherein the second adhesive layer of each of the plurality of light-emitting device stacks further comprises a second refractive index matching layer covering the second metasurface.
5 . The multi-channel visible light communication system according to claim 2 , wherein the second adhesive layer of each of the plurality of light-emitting device stacks further comprises a distributed Bragg reflector below the second metasurface.
6 . The multi-channel visible light communication system according to claim 2 , wherein a wavelength of the first color light emitted from the first light-emitting device is greater than that of the second color light emitted from the second light-emitting device, and the wavelength of the second color light emitted from the second light-emitting device is greater than that of the third color light emitted from the third light-emitting device.
7 . The multi-channel visible light communication system according to claim 6 , wherein the first light-emitting device is a red light-emitting device, the second light-emitting device is a green light-emitting device, and the third light-emitting device is a blue light-emitting device.
8 . The multi-channel visible light communication system according to claim 1 , wherein the first refractive index matching layer is made of organic glue.
9 . The multi-channel visible light communication system according to claim 1 , wherein the first adhesive layer of each of the plurality of light-emitting device stacks further comprises a distributed Bragg reflector below the first metasurface.
10 . A multi-channel visible light communication system, comprising:
a carrier board; and
a plurality of light-emitting device stacks, arranged over the carrier board, wherein each of the plurality of light-emitting device stacks comprises:
a first light-emitting device comprising a plurality of first conductive pads;
a second light-emitting device disposed over the first light-emitting device and comprising a plurality of second conductive pads, wherein the plurality of first conductive pads are electrically isolated from the plurality of second conductive pads; and
a first adhesive layer, disposed between the first light-emitting device and the second light-emitting device, where the first adhesive layer comprises a first metasurface, the first metasurface of the first adhesive layer comprises:
a first substrate; and
a plurality of first antennas protruding upward from the first substrate; and
a first refractive index matching layer covering upper surfaces and all side faces of the plurality of first antennas of the first metasurface.
11 . The multi-channel visible light communication system according to claim 10 , wherein each of the plurality of light-emitting device stacks further comprises:
a third light-emitting device disposed over the second light-emitting device and comprising a plurality of third conductive pads, wherein the plurality of third conductive pads are electrically isolated from the plurality of first conductive pads and the plurality of second conductive pads; and
a second adhesive layer, disposed between the second light-emitting device and the third light-emitting device, where the second adhesive layer comprises a second metasurface.
12 . The multi-channel visible light communication system according to claim 11 , wherein a wavelength of first color light emitted from the first light-emitting device is greater than that of second color light emitted from the second light-emitting device, and the wavelength of the second color light emitted from the second light-emitting device is greater than that of third color light emitted from the third light-emitting device.
13 . The multi-channel visible light communication system according to claim 12 , wherein the first light-emitting device is a red light-emitting device, the second light-emitting device is a green light-emitting device, and the third light-emitting device is a blue light-emitting device.
14 . The multi-channel visible light communication system according to claim 12 , wherein the first metasurface is configured to pass the first color light emitted from the first light-emitting device and reflect the second color light emitted from the second light-emitting device, and the second metasurface is configured to pass the first color light emitted from the first light-emitting device and the second color light emitted from the second light-emitting device and reflect the third color light emitted from the third light-emitting device.
15 . The multi-channel visible light communication system according to claim 11 , wherein
the second metasurface of the second adhesive layer comprises:
a second substrate; and
a plurality of second antennas protruding upward from the second substrate.
16 . The multi-channel visible light communication system according to claim 15 , wherein the plurality of first antennas differ from the plurality of second antennas in width.
17 . The multi-channel visible light communication system according to claim 15 , wherein the plurality of first antennas differ from the plurality of second antennas in arrangement period.
18 . The multi-channel visible light communication system according to claim 15 , wherein the second adhesive layer of each of the plurality of light-emitting device stacks further comprises a second refractive index matching layer covering upper surfaces and all side faces of the plurality of second antennas of the second metasurface.