Microfluidic detection device

A microfluidic detection device comprising:

• a circuit substrate provided with:
• at least one first light-emitting device used to emit a detection beam;
• a photodetector used to receive the detection beam and send out a sensing signal;
• and
• a control circuit electrically connected to the at least one first light-emitting device and the photodetector;
• and
• a transparent substrate overlapping the circuit substrate and being provided with:
• a microfluidic channel;
• and
• a light guide structure having a light incident surface and a light exiting surface, the light guide structure is surrounded by the transparent substrate, the light guide structure extending from each of the light incident surface to the microfluidic channel, and the light guide structure extending from the light exiting surface to the microfluidic channel, and the light guide structure adapted to transmit the detection beam into and out of the microfluidic channel, wherein the light incident surface of the light guide structure is disposed corresponding to the at least one first light-emitting device, and the light exiting surface of the light guide structure is disposed corresponding to the photodetector.