GaNbased microLED, as a burgeoning light source technology, has been demonstrated to play an important role in optical communication and display fields, etc. If the pixels in microLED array can detect the optical performance of the adjacent pixels, it is expected to realize multifunctional microLED array for monolithic integration with light detection, thus promoting the development of photonic integrated chips for Internet of Things technology toward miniaturization and low power consumption. It was experimentally verified that InGaN/GaN MQWs can realize the dual functions of luminescence and detection under different operating voltages, thus proving the feasibility of microLED array monolithic integrated luminescence and realtime detection. Moreover, microLED array was further applied in high stability visible light communication and realtime detection of dead pixels in display array, which broadens the potential applications of microLED array.