LED diffused transmission freeform surface design for uniform illumination

Zhu, Zhaoda; Yuan, Jie; Sun, Xiang; Peng, Bo; Xu, Xin; Liu, Quan-Xin

doi:10.1007/s12596-018-0505-7

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…Similar and detailed analysis are performed in literature concerning phase distribution of a hexagonal array at fractional Talbot planes (Guo et al 2007), LED diffused transmission freeform surface design for uniform illumination (Zhu 2019), and software design of SMD LEDs for homogeneous distribution of irradiation in the model of dark room (Liner et al 2014).…”

Section: Soft Frequency Reuse (Ffr)mentioning

confidence: 94%

Enhanced bit error rate in visible light communication: a new LED hexagonal array distribution

et al. 2022

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Due to the exponential growth of mobile devices and wireless services, a huge demand for radio frequency has increased. The presence of several frequencies causes interference between cells, which must be minimized to get the lower bit error rate (BER). For this reason, it is of great interest to use visible light communication (VLC). This paper suggests a VLC system that decreases the BER with applying a new LED distribution with a hexagonal shape using different techniques: on–off keying (OOK), quadrature amplitude modulation, and frequency reuse concept to mitigate the interference between the reused frequencies inside the hexagonal shape. The BER is measured in two scenarios line of sight (LoS) and non-line of sight for each technique that we used. The recommended values of BER in the proposed model for soft frequency reuse in case of LoS at 4, 8, and 10 dB signal to noise ratio, are 3.6 × 10–6, 6.03 × 10–13, and 2.66 × 10–18, respectively.

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Section: Soft Frequency Reuse (Ffr)mentioning

confidence: 94%

Enhanced bit error rate in visible light communication: a new LED hexagonal array distribution

et al. 2022

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“…Ye et al proposed the deposition of high-reflectivity thin films on chip surfaces to improve light angles [ 40 ]. Zhu et al proposed a diffused transmission freeform surface for LED illumination that increases illumination efficiency and provides high uniformity [ 41 ]. Sun et al proposed a total-internal-reflection structure that is based on the ray-mapping method and provides improved light extraction efficiency and uniformity [ 42 ].…”

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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“…Zhu et al proposed a free-form surface design method for LEDs to achieve diffusion and transmission. This lighting system affords advantages such as high efficiency and high uniformity [ 37 , 38 , 39 ].…”

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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LED diffused transmission freeform surface design for uniform illumination

Cited by 8 publications

References 25 publications

Enhanced bit error rate in visible light communication: a new LED hexagonal array distribution

Enhanced bit error rate in visible light communication: a new LED hexagonal array distribution

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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