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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/m, 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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http://dx.doi.org/10.3390/nano12061032 | DOI Listing |
Light Sci Appl
September 2025
Laboratory of Quantum Information, University of Science and Technology of China, 230026, Hefei, China.
Quantum imaging with spatially entangled photons offers advantages such as enhanced spatial resolution, robustness against noise, and counterintuitive phenomena, while a biphoton spatial aberration generally degrades its performance. Biphoton aberration correction has been achieved by using classical beams to detect the aberration source or scanning the correction phase on biphotons if the source is unreachable. Here, a new method named position-correlated biphoton Shack-Hartmann wavefront sensing is introduced, where the phase pattern added on photon pairs with a strong position correlation is reconstructed from their position centroid distribution at the back focal plane of a microlens array.
View Article and Find Full Text PDFSensors (Basel)
August 2025
College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China.
Accurate and robust calibration of multifocal plenoptic cameras is essential for high-precision 3D light field reconstruction. In this work, we propose a blur feature-guided cascaded calibration for the plenoptic camera. First, white images at different aperture values are used to estimate the high-confidence center point and radius of micro-images, and the defocus theory is used to estimate the initial values of the intrinsic parameters.
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August 2025
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
To enable multi-channel parallel spectral analysis in array-based devices such as micro-light-emitting diodes (Micro-LEDs) and line-scan spectral confocal systems, the development of compact array spectrometers has become increasingly important. In this work, a novel spectrometer architecture based on a microlens array grating (MLAG) is proposed, which addresses the major limitations of conventional spectrometers, including limited parallel detection capability, bulky structures, and insufficient spatial resolution. By integrating dispersion and focusing within a monolithic device, the system enables simultaneous acquisition across more than 2000 parallel channels within a 10 mm × 10 mm unit consisting of an = 4 mm microlens and a 600 lines/mm blazed grating.
View Article and Find Full Text PDFOpt Express
February 2025
This paper explores the fabrication of aspherical microlens arrays using a grayscale ultraviolet (UV) exposure system based on a digital micromirror device (DMD). The proposed DMD-based lithography system employs an oblique stepping method, where the DMD array is slightly tilted in the stepping direction to perform step-by-step grayscale UV exposure. This approach assigns the DMD pixels to a group of exposure points that are uniformly distributed over a large area with high spatial resolution.
View Article and Find Full Text PDFThis study presents a hybrid approach to enhance the optical performance of phosphor-in-glass (PiG) structures for white light-emitting diodes (WLEDs) by integrating laser-fabricated microlens arrays (MLAs) onto the phosphor surface. The MLA structures were directly patterned using laser direct writing and drilling, offering precise photon redirection without compromising the thermal or mechanical stability of the PiG material. By varying the microlens spacing (100, 105, 120, and 135 μm), the effect of structural parameters on light extraction and angular emission was systematically investigated.
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