Abstract
This work discusses a super thin Mini-LED direct back light for upscale liquid crystal displays. In this manuscript, it is that Mini-LED light is reflected between a gradient reflected pattern combined with Mini-LED driving lines and back reflector of back light unit. The optical length is therefore enlarged in limited distance, which means that the diffusor plate and optical distance can be removed. Meanwhile, light from a red, a green and a blue Mini-LED is mixing to generate white for display, replacing a 0.3–0.5mm thick color changing film, such as quantum dot enhancement film. The total thickness of this designed Mini-LED back light is about 1.595mm when Mini-LED pitch is 4.75mm. The measured uniformity and optical efficiency are verified as designs above 90% and 45%. Additionally, this direct back light can realize high-dynamic range to improving display quality with lower power consumption. This work not only improves display quanlity in limited thickness, but also extends lifetime of liquid crystal display in coming future.
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