Thin mini-LED backlight using reflective mirror dots with high luminance uniformity for mobile LCDs

Kikuchi, Sho; Shibata, Yosei; Ishinabe, Takahiro; Fujikake, Hideo

doi:10.1364/oe.433566

Cited by 26 publications

(11 citation statements)

References 30 publications

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“…Common measures for this process include adding optical structures such as bank isolation [31] or lens collimation [32]. A specific approach is to cut slits in the LGP at the boundary of each dimming segment as shown in Figure 7 [33]. The addition of slits can effectively reduce the crosstalk between adjacent local dimming areas and suppress the halo effect.…”

Section: Led Light Expansion and Local Light Confinementmentioning

confidence: 99%

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Mini-LED Backlight Technology Progress for Liquid Crystal Display

et al. 2022

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As consumers pursue higher display quality, Mini-LED backlight technology has become the focus of research in the current display field. With its size advantage (100–200 μm), it can achieve one-thousand-level divisional dimming, and it can also be combined with quantum dot technology to greatly improve the contrast, color gamut, dark state and other element of the display performance of LCD displays. Mini-LED backlight technology is undoubtedly the most ideal solution to realize a highly dynamic range display of LCD displays, and has been widely commercialized in many fields such as TVs, tablet computers, notebook computers, and car monitors. This review mainly introduces the efforts made by researchers to eliminate the halo effect, thinning of the backlight module and reducing the backlight power consumption. The application of quantum dot technology in backlight is also presented. We predict that the number of Mini-LED backlight partitions is expected to reach a level of more than 3000 in the future, further utilizing the advantages of the small size in local dimming, but it will also inevitably be challenged by some issues such as power consumption and heat dissipation.

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Section: Led Light Expansion and Local Light Confinementmentioning

confidence: 99%

“…[33]. The LGP above the Mini-LEDs is equipped with reflective dots and a reflector which are separately placed on the top and bottom surfaces.…”

mentioning

confidence: 99%

Mini-LED Backlight Technology Progress for Liquid Crystal Display

et al. 2022

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“…In their research on module thinning, Ye et al proposed the use of mini-LEDs that incorporate multiple three-dimensional (3D) diffuse reflection cavity arrays to develop a design that enables thin backlight modules to achieve high uniformity and luminance [ 48 ]. Similarly, Kikuchi et al proposed a mini-LED backlight module with highly reflective mirror dots, which is a design that utilizes the structure of mirror dots and the slot between LEDs to improve uniformity and suppress the halo effect; although the thickness of the module was successfully reduced, its light extraction efficiency was only 58.8% [ 49 ]. In conclusion, few studies have examined extra-thin, large-area, high-luminance, and high-uniformity properties.…”

Section: Introductionmentioning

confidence: 99%

Application of Mini-LEDs with Microlens Arrays and Quantum Dot Film as Extra-Thin, Large-Area, and High-Luminance Backlight

Chen

Lai

et al. 2022

Nanomaterials

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The demand for extra-thin, large-area, and high-luminance flat-panel displays continues to grow, especially for portable displays such as gaming laptops and automotive displays. In this paper, we propose a design that includes a light guide layer with a microstructure above the mini-light-emitting diode light board. The light control microstructure of concave parabel-surface microlens arrays on a light-emitting surface increases the likelihood of total internal reflection occurring and improved the uniformity merit function. We used a 17 in prototype with quantum-dot and optical films to conduct our experiments, which revealed that the thickness of the module was only 1.98 mm. When the input power was 28.34 watts, the uniformity, average luminance, and CIE 1931 color space NTSC of the prototype reached 85%, 17,574 cd/m2, and 105.37%, respectively. This module provided a flat light source that was extra thin and had high luminance and uniformity.

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“…Although these two designs can achieve large-area light sources, they cannot achieve a thin, high-luminance, flat light source. Sho et al proposed a thin mini-LEDs backlight using reflective mirror dots to obtain high luminance uniformity for mobile LCDs [47].…”

Section: Introductionmentioning

confidence: 99%

Mini-LEDs with Diffuse Reflection Cavity Arrays and Quantum Dot Film for Thin, Large-Area, High-Luminance Flat Light Source

Cheng

Liu³

et al. 2021

Nanomaterials

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Mini-light-emitting diodes (mini-LEDs) were combined with multiple three-dimensional (3D) diffuse reflection cavity arrays (DRCAs) to produce thin, large-area, high-brightness, flat light source modules. The curvature of the 3D free-form DRCA was optimized to control its light path; this increased the distance between light sources and reduced the number of light sources used. Experiments with a 12.3-inch prototype indicated that 216 mini-LEDs were required for a 6 mm optical mixing distance to achieve a thin, large-area surface with high brightness, uniformity, and color saturation of 23,044 cd/m2, 90.13%, and 119.2, respectively. This module can serve as the local dimming backlight in next generation automotive displays.

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Thin mini-LED backlight using reflective mirror dots with high luminance uniformity for mobile LCDs

Cited by 26 publications

References 30 publications

Mini-LED Backlight Technology Progress for Liquid Crystal Display

Mini-LED Backlight Technology Progress for Liquid Crystal Display

Application of Mini-LEDs with Microlens Arrays and Quantum Dot Film as Extra-Thin, Large-Area, and High-Luminance Backlight

Mini-LEDs with Diffuse Reflection Cavity Arrays and Quantum Dot Film for Thin, Large-Area, High-Luminance Flat Light Source

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