Micro-size light emitting diode (microLED) arrays based on III-nitride semiconductors have emerged as a promising technology for a wide range of applications. If InGaN microLED arrays can be integrated on to Si complementary metal-oxide-semiconductor (CMOS) substrates for active driving, these devices could play crucial roles in ultra-portable products such as next generation pico-projectors, as well as in emerging fields such as biophotonics and optogenetics. Here we present a demonstration of, ...