Fig. 1. (a) Schematic structure of single Micro-LED; (b) the optical micrograph of the Micro-LEDs with diameters from 40 μm to 100 μm; (c) 3D structure diagram of passive Micro-LED array; (d) optical micrograph.

Fig. 2. Size-dependent characteristics of current versus voltage (I-V).

Fig. 3. Size-dependent characteristics of luminous flux and radiant flux: (a) Current density versus luminous flux; (b) current density versus radiant flux.

Fig. 4. Temperature versus voltage curves with various test current, and Micro-LED size versus k coefficient: (a) Temperature versus voltage curves at 0.5 mA; (b) temperature versus voltage curves at 2 mA; (c) temperature versus voltage curves at 5 mA; (d) size and drive current versus kcoefficient.

Fig. 5. Micro-LED pixel size versus radiant flux with different temperature and test current.

Fig. 6. Passive picro-LED array whose pixel size is 60 μm, driven and lighted by FPGA: (a) Display sample; (b) display array light.