In this paper, some of the technological bottlenecks of the microlight-emitting diode (μLED) for a micro-display were reviewed. Although there remain other issues, the μLED technology has a potential for some micro-display applications which especially demand high brightness and reliability such as augmented reality (AR) display, automotive head-up display (HUD), and so on. The efficiency of μLED needs to be improved, and an integration technology for active matrix driving and technologies for full-color realization as well as defective pixel control must be developed. An optimum specification of a μLED display was proposed to maximize reality in micro-display products.

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