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.

This report discusses a glass based ultra‐thin Red, Green and Blue Mini‐LED direct back light for high‐end professional liquid crystal displays. In this work, a gradient reflected pattern combined Mini‐LED driving lines reflect light scattering between the patterns and back reflector of back light unit, and therefore enlarge Mini‐LED optical length. A group of a red, green and red Mini‐LED is using to generate white for display, replacing a 0.3–0.5mm thick color changing film. The total thickness of Mini‐LED direct back light is reduced to 1.595mm when the Mini‐LED pitch is about 4.75mm. This direct back light can realize high‐dynamic range to improving display quality without cost consumption and then extend lifetime liquid crystal display lifetime in coming decent years.

A low power consumption is one of the most important issue for all of the electrical products, especially for wearable products. This manuscript proposed a polarized light emitting diode (LED) chip which is used for a direct back light unit for LCD. A wire grid polarizer and a meta-surface textures are set on the top and bottom of the LED chip in order to obtain a high polarization ratio and transparency. After optimizing the potential parameters, the transmittance of TM and the polarization can reach up to 93.71% and 99.3% respectively. It can replace the normal LED in direct back light unit, and obtain an improved efficiency of 20%, when comparing liquid crystal display with a bottom APF polarizer. It can be used for reducing power consumption and supply dependence, as well as the cost of displays.