Abstract
We analyze the performance of high dynamic range liquid crystal displays (LCDs) using a two-dimensional local dimming mini-LED backlight. The halo effect of such a HDR display system is investigated by both numerical simulation and human visual perception experiment. The halo effect is mainly governed by two factors: intrinsic LCD contrast ratio (CR) and dimming zone number. Based on our results, to suppress the halo effect to indistinguishable level, a LCD with CR≈5000:1 requires about 200 local dimming zones, while for a LCD with CR≈2000:1 the required dimming zone number is over 3000. Our model provides useful guidelines to optimize the mini-LED backlit LCDs for achieving dynamic contrast ratio comparable to organic LED displays.
Highlights
High dynamic range (HDR) is an important feature for generation displays [1,2]
We develop a numerical model to analyze and optimize the HDR liquid crystal displays (LCDs) system with a mini-light emitting diode (LED) backlight
Our results indicate that a LCD with contrast ratio (CR)≈5000:1 (MVA TV) would require >200 dimming zones to achieve unnoticeable halo effect
Summary
High dynamic range (HDR) is an important feature for generation displays [1,2]. A HDR display must exhibit a high contrast ratio (CR>105:1) in order to reveal the detailed images in both high and low brightness regions simultaneously. How to achieve HDR is becoming a significant and urgent task for LCD To overcome this challenge, segmented LEDs are adopted in the LCD backlight unit, where the local zones can be independently dimmed to match the displayed image contents [14,15,16,17,18,19,20]. This so-called local dimming technique can effectively suppress the dark state light leakage and greatly enhance the contrast ratio. Higher intrinsic LCD contrast ratio and appropriate local dimming zones are two promising approaches
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