| Ga N-based blue light-emitting diodes(LEDs)have attracted much attention for applications in our daily life,such as light communication,traffic signals,mobile phone keypad lights,full color display,and backlight in liquid crystal displays.However,with the rapid development of display technology,the traditional liquid crystal display technology gradually failed to meet the market demand.Ga N-based Micro-LED arrays has attracted much attention in fields concerning advanced display due to the superior properties,such as high brightness,low latency,long service life and high contrast.In this thesis,Ga N-based Micro-LED display was designed and fabricated based on the detail fabrication process flow.As LED chips become micron scales,the increase in the number of LED chips causes more heat in LED displays.Thus,the thermal stability and temperature uniformity of the Micro-LED array were studied.We present studies of the color change and thermal distribution of a flexible and transparent 32×32 mini-LED array on polyethylene terephthalate(PET)substrate up to a brightness rating of 5000 nits at room temperature,whose brightness is required for outdoor display applications.Surprisingly,even at 5000 nits,the temperature variation on the surface of the LED array is less than 9 °C,despite the relatively low thermal diffusivity of the polymer substrates.The average surface temperature was 33 °C.This indicates that the heat dissipation of the fabricated LED array is superior with even a polymer substrate.Further,the narrow electroluminescent(EL)emissions from the mini-LED array help to realize wider color gamut than Rec.2020 color gamut in display applications.The color differences from the EL spectra were calculated at three different brightness,i.e.,10,700,and 5000 nits.The calculated values are far less than the color discrimination threshold of the human eye corresponding to 0.005 at all testing brightness and meet the display industry requirement for color difference. |
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