Micro-light-emitting-diode (μLED) displays with low power consumption are highly desirable for the mobile devices powered by batteries. However, since the smaller LED chip size corresponds to lower optical efficiency, this advantage is compromised. In this paper, we develop a model to evaluate the power consumption of micro-LED displays based on ambient contrast ratio. Then, the optimal μLED chip sizes to achieve the lowest power consumption for smartphones, laptop computers, and TVs, are obtained. Furthermore, we propose to employ different RGB chip sizes in uLED displays. In comparison with the optimal results with uniform LED chip size, our new design offers an additional 12% average power saving for real image contents.
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