Optical sensing device and optical sensing system thereof comprising light emitting device and light receiving device completely sandwiched by the topmost surface and bottommost surface of a carrier body with different vertically separated distances

1. An optical sensing device, comprising:

a carrier body having a topmost surface and a bottommost surface;

a first light-emitting device disposed on the carrier body, and having a light-emitting surface; and

a light-receiving device comprising a group III-V semiconductor material, disposed on the carrier body, and having a light-receiving surface;

wherein the first light-emitting device and the light-receiving device are completely located within a space sandwiched by the topmost surface and the bottommost surface, the light-emitting surface is vertically separated from the topmost surface by a first distance H 1 , the light-receiving surface is vertically separated from the topmost surface by a second distance H 2 , and H 1 is different from H 2 .

2. The optical sensing device of claim 1 , wherein H 1 is larger than H 2 .

3. The optical sensing device of claim 1 , wherein H 1 is smaller than H 2 , and the first light-emitting device and the light-receiving device have bottommost surfaces which are located on different elevations.

4. The optical sensing device of claim 1 , wherein the carrier body comprises a first block wall, a second block wall, and a third block wall, wherein the first light-emitting device is disposed between the first block wall and the second block wall, and the light-receiving device is disposed between the second block wall and the third block wall.

5. The optical sensing device of claim 4 , wherein each of the first block wall and the second block wall comprises a light-reflective layer facing the first light-emitting device.

6. The optical sensing device of claim 4 , wherein each of the second block wall and the third block wall comprises a light-absorbing layer facing the light-receiving device.

7. The optical sensing device of claim 4 , wherein the carrier body comprises a carrier surface, the first light-emitting device and the light-receiving device are disposed on the carrier surface, the first block wall and the carrier surface form a first angle, the second block wall and the carrier surface form a second angle, and the first angle is equal to the second angle.

8. The optical sensing device of claim 1 , wherein the carrier body comprises a carrier surface, a first block wall, and a second block wall, the first light-emitting device and the light-receiving device are disposed on the carrier surface, the first block wall and the carrier surface form a first angle, the second block wall and the carrier surface form a second angle; the first light-emitting device and the light-receiving device are not intervened by either the first block wall or the second block wall.

9. The optical sensing device of claim 8 , further comprising a connecting device disposed between the first light-emitting device and the carrier body.

10. The optical sensing device of claim 1 , wherein the light-receiving device comprises a substrate, a first semiconductor layer, and a second semiconductor layer disposed between the substrate and the first semiconductor layer.

11. The optical sensing device of claim 10 , wherein the first semiconductor layer comprises a band gap larger than that of the second semiconductor layer.

12. The optical sensing device of claim 1 , wherein the light-receiving device is capable of receiving lights of different emitting wave bands.

13. The optical sensing device of claim 1 , further comprising a second light-emitting device disposed on the carrier body, wherein the first light-emitting device and the second light-emitting device have different emitting wave bands.

14. The optical sensing device of claim 1 , wherein the light-receiving device is a flip-chip type photodiode.

15. The optical sensing device of claim 1 , wherein the first light-emitting device is a flip-chip type light-emitting diode or a flip-chip type laser-diode.

16. The optical sensing device of claim 1 , wherein the first light-emitting device comprises a first electrode and a second electrode, and the first electrode and the second electrode are oriented toward the carrier body and surrounded by a supporting structure.

17. The optical sensing device of claim 16 , wherein the supporting structure has an outer surface flush with an outer surface of the first light-emitting device.

18. The optical sensing device of claim 16 , wherein the supporting structure covers a lower surface of the first light-emitting device.

19. An optical sensing system, comprising:

an optical sensing device of claim 1 ;

a current control circuit, electrically connected to the optical sensing device;

an amplifier, electrically connected to the optical sensing device for receiving and amplifying an electric signal from the optical sensing device; and

a signal processing module, electrically connected to the current control circuit to output a signal for adjusting a light intensity of light emitted by the first light-emitting device.

20. The optical sensing system of claim 19 , further comprising:

a filter, electrically connected to the amplifier to eliminate an environmental noise; and

an ADC circuit, electrically connected to the filter to convert an analog electric signal to a digital electric signal.