Current situation and trend of Micro-LED application in near-eye display

Zhou, Ziping; Yao, Li; Yan, Yinguo; Jiang, Haonan; CHEN, En-guo; XU, Sheng; YE, Yun; Sun, Jie; Yan, Qun; Guo, Tailiang

doi:10.37188/cjlcd.2022-0068

Cited by 7 publications

(4 citation statements)

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“…Simultaneously, the pursuit of immersive visual experiences is gradually increasing. Augmented Reality (AR) display technology overlays virtual image information onto the real world, thereby offering an unprecedented immersive display experience [1] . To achieve this goal, AR optical modules are essential for integrating virtual and real visuals, and ideally, users are more receptive to AR devices with a compact, glasses-like appearance, offering a more comfortable wearing experience.…”

Section: Introductionmentioning

confidence: 99%

P‐4.25: AR Waveguide Display with Enlarged Eyebox Based on Polarization Volume Gratings

Lin,

Zhang,

Jin

et al. 2024

Symp Digest of Tech Papers

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The optical waveguide shows advantages in terms of exit pupil and appearance shape, and is the mainstream method of AR combiner in the future. The method of exit pupil expansion is to diffract and derive the waveguide along the propagation direction for many times, so that the brightness of the exit pupil gradually darkens in space along the direction of light propagation, resulting in the unevenness of the exit pupil. Especially, polarization volume grating (PVG) is used as a coupler, PVG only responds to one of the circularly polarized light, and the orthogonal circularly polarized light will be directly transmitted. Therefore, a waveguide AR engine based on PVG is proposed here, and the left‐handed circularly polarized light and right‐handed circularly polarized light are used to expand the range of the eyebox without reducing its brightness uniformity. The experimental test results show that the range of the eye box is doubled while maintaining 66.6% global uniformity at a horizontal field of view of 32.8°.

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Section: Introductionmentioning

confidence: 99%

P‐4.25: AR Waveguide Display with Enlarged Eyebox Based on Polarization Volume Gratings

Lin,

Zhang,

Jin

et al. 2024

Symp Digest of Tech Papers

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“…With the progress of information technology, the projector is developing towards the direction of miniaturization gradually, but the passive light‐emitting engines bring complex system structure, large size, and low efficiency, which have hindered their integrated development 2 . Compared with passive light‐emitting technology, micro‐LED (μLED) is a kind of self‐emitting micro‐display device with individually driven sub‐pixels, 3 which has faster response, higher efficiency, and lower power consumption 4 . These characteristics are more suitable for the development direction of pico‐projectors.…”

Section: Introductionmentioning

confidence: 99%

“…2 Compared with passive lightemitting technology, micro-LED (μLED) is a kind of selfemitting micro-display device with individually driven sub-pixels, 3 which has faster response, higher efficiency, and lower power consumption. 4 These characteristics are more suitable for the development direction of picoprojectors.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient and ultra‐compact micro‐LED pico‐projector based on a microlens array

Jiang

Yan

et al. 2023

J Soc Info Display

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Pico-projection displays are the main developing direction for future projection displays, but the balance between the optical efficiency and the system size is still a big concern. This paper presents a pico-projector design based on micro-LED (μLED) light sources. Firstly, based on the analysis of the characteristics of μLED, a highly integrated microlens array is designed to improve the system efficiency by reshaping the spatial light distribution. In addition, the matching relationship between the aperture angle of projection lens and the divergence angle of μLED is studied, and on this basis, a set of four-piece spherical lens group is proposed to achieve compact size. Simulation results show that the μLED equipped with the microlens array can concentrate about 86% of the light energy within a dispersion angle of ±20 , thus increasing the light energy utilization by about 3.5 times and reducing the size of the pico-projector to 30.18 mm 3 . The designed pico-projector has high performance and compact size with great potential for future applications.

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“…In recent years, phosphor conversion materials have become a research hotspot of mainstream international scientific research institutions. Cesium lead halide perovskite quantum dots (PQDs) have attracted extensive attention in many optoelectronic devices, such as solar cells, LEDs, photodetectors, and excitation devices, because of the adjustable emission wavelength, narrow−band emission, large absorption, and high photoluminescence quantum yield (PLQY) [ 4 , 5 , 6 , 7 ]. However, PQDs still have the problem of poor stability, especially in terms of moisture and heat.…”

Section: Introductionmentioning

confidence: 99%

Cs(Pb,Mn)Br3 Quantum Dots Glasses with Superior Thermal Stability for Contactless Electroluminescence Green−Emitting LEDs

Zhao

et al. 2022

Nanomaterials

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CsPbX3 (X = Cl, Br or I) perovskite quantum dots (PQDs) have gained increasing interest due to their superior performance in photoelectric applications. In our work, a series of Mn2+ doped CsPbBr3 PQDs were successfully prepared in glasses by melt quenching and in situ crystallization technique. Due to the 4T1 (4G)→6A1 (6S) transition of Mn2+, a slight red shift from 510 nm to 516 nm was found, with the FWHM expansion from 18 nm to 26 nm. The PQDs@glasses showed excellent thermal stability, and the exciton binding energy reached a high level of 412 meV. The changes of the electronic structure after Mn doping CsPbBr3 can be demonstrated by first principles. Finally, a contactless electroluminescence device with the PQDs@glasses was designed based on the principle of electromagnetic induction, which is a potential application for detecting distance in sterile and dust−free environments.

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Current situation and trend of Micro-LED application in near-eye display

Cited by 7 publications

References 0 publications

P‐4.25: AR Waveguide Display with Enlarged Eyebox Based on Polarization Volume Gratings

P‐4.25: AR Waveguide Display with Enlarged Eyebox Based on Polarization Volume Gratings

Highly efficient and ultra‐compact micro‐LED pico‐projector based on a microlens array

Cs(Pb,Mn)Br3 Quantum Dots Glasses with Superior Thermal Stability for Contactless Electroluminescence Green−Emitting LEDs

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