Zero-Optical-Distance Mini-LED Backlight with Cone-Shaped Light Coupling Microstructures

Abstract

This paper presents a zero-optical-distance mini-LED backlight with cone-shaped light coupling microstructures to achieve an ultra-thin backlight architecture (~0.1 mm thickness) by combining the characteristics of direct-lit and edge-lit backlights. There is no gap between the light guide plate (LGP) and the reflector, as well as between the LGP and the mini-LED embedded in the reflector. The illuminance uniformity and light extraction efficiency (LEE) of the whole structure reach 91.47% and 77.09%, respectively. Nine sub-modules are spliced together to realize 2D local dimming with 0.29% crosstalk. The structure shows high optical performance while reducing the thickness of the backlight module, which is of great significance for the development of mini-LED backlights.

Impacts of Local Dimming Algorithms on the Halo Effect in LCD With Local Dimming Mini-LED Backlight

“…In the past, the researches on the halo effect of LCD with local dimming mini-LED backlight were mostly based on simulation, and the investigations based on the practical test were still lacking. Testing according to multiple methods helps to speed up the desired results, promotes the integration of multiple independently controlled local dimming areas, can achieve high contrast, effectively suppress crosstalk, and further improve optical performance, which has irreplaceable advantages [32], [33], [34], [35]. In this…”