Fig. 2: Fabrication processes.

a The micro-LED array and b the micro-ECoG electrode array based on polyimide substrate. c Assembled device with the micro-LED array stacked on the micro-ECoG electrode array

a The micro-LED array and b the micro-ECoG electrode array based on polyimide substrate. c Assembled device with the micro-LED array stacked on the micro-ECoG electrode array