Abstract

Backlight units (BLUs) with miniLEDs as light sources can help improve display contrast and decrease the thickness of a liquid crystal display. Different from the current solutions of a diffuser film and secondary lens, the paper proposes a total-inner-reflection-based design method. The profile of a microstructure is decided when the powers of the rays reflected by the microstructure reach the maximum. Both simulated and experimental results show that uniformity can satisfy the requirement when the source-screen gap is 1 mm. With ultrathin thickness and no requirement for precise positioning, the designed miniLED BLU presents strong practicability.

© 2021 Optical Society of America

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