LEDpositive negative symbol

Led by Associate Professor Tingzhu Wu, the team engineered a device architecture incorporating blue semipolar micro-LEDs, which inherently emit polarized light. These LEDs serve as the excitation source for color-conversion layers made from stretched composite films of green and red perovskite nanocrystals. These films exhibit strong polarized emission thanks to their aligned wire structures, further enhanced by encapsulation in a high-dielectric constant material for the red components.

The technology's compatibility with existing industrial manufacturing processes for large-scale production of stretched polymer films indicates its potential for rapid integration into commercial products. With its ability to maximize energy utilization in LCD backlights without the need for additional UV filtering, this self-polarizing RGB device represents a step towards more efficient and vibrant displays.

Polarized LEDlight

In the world of optics, precision and innovation have led to significant advancements in lens technology. Aspheric lenses have gained recognition for their ability to improve visual clarity, reduce distortion, and enhance overall comfort. This article explores the numerous benefits of aspheric lenses and highlights why they should be considered for various applications.

SMDLEDpolarity

This device design has achieved polarized light emission across the full RGB spectrum with high efficiency and stability, marking a critical advancement in display technology. The green and red perovskite layers maintain their polarization properties under stretch, offering a practical solution for scalable luminescence applications. Furthermore, the device demonstrates a wide color gamut, exceeding standard benchmarks with 137.2% of NTSC and 102.5% of Rec. 2020, alongside impressive Degree of Linear Polarization (DOLP) values across all three colors.

Aspheric lenses have revolutionized the optical industry by addressing the limitations of traditional spherical lenses. The benefits they offer, such as reduced optical aberrations, improved visual acuity, wider fields of view, enhanced comfort, and versatility in design, make them an excellent choice for individuals seeking superior vision correction.

LEDanode cathode diagram

Structure of an LCD based on semipolar blue μLEDs excite anisotropic perovskite NCs as backlight. Image from Opto-Electronic Advances

Can a single chipLEDproduce white light

The team's device uses halide perovskite nanocrystals, known for their exceptional photoluminescence and color purity, within anisotropic structures to achieve polarized emission without significant light loss. This approach not only addresses the inefficiencies of current polarizing techniques but also circumvents the challenges associated with synthesizing red-emitting perovskite nanostructures, which are often plagued by morphological instability.

Aspheric single vision is available in poly, trivex, 1.67, 17.0/1.74, and Transitions. Aspheric Flattop 28 is available in clear poly only. Aspheric is not available with progressive lenses.

Due to their reduced curvature and improved optics, aspheric lenses offer enhanced comfort during extended periods of wear. These lenses minimize image distortion and peripheral blur, reducing eye strain and fatigue. Additionally, aspheric lenses provide better adaptability to bifocal prescriptions, allowing for smoother transitions between different visual zones. This adaptability contributes to a more seamless and effortless visual experience for individuals requiring bifocal corrections.

How to identify positive and negative terminal ofLED

Researchers from China's Xiamen University, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Yang Ming Chiao Tung University and Hon Hai Research Institute have reported a self-polarizing RGB device utilizing semipolar micro-LEDs and perovskite-in-polymer films aimed at improving backlight applications.

LEDpolarity marking on PCB

Traditional lenses have a spherical shape, resulting in optical aberrations such as spherical aberration. Aspheric lenses, on the other hand, have a non-uniform surface curvature, allowing for a gradual change in the lens profile. This design helps minimize these aberrations, ensuring a more accurate focus across the entire visual field. The reduction in aberrations leads to sharper, clearer vision, particularly in low-light conditions or when looking at off-axis objects.

In backlighting systems for LCDs, conventional red, green, and blue (RGB) light sources that lack polarization properties can result in a significant optical loss of up to 50% when passing through a polarizer. To address this inefficiency and optimize energy utilization, the scientists developed a high-performance device designed for RGB polarized emissions. The device uses an array of semipolar blue µLEDs with inherent polarization capabilities, coupled with mechanically stretched films of green-emitting CsPbBr3 nanorods and red-emitting CsPbI3-Cs4PbI6 hybrid nanocrystals.

The unique design of aspheric lenses also enables a wider field of view compared to traditional spherical lenses. Aspheric lenses distribute peripheral magnification more evenly, resulting in a greater expanse of clear vision. This characteristic is good for activities that require enhanced peripheral awareness, such as driving, sports, or even everyday tasks that demand visual awareness of the surroundings.

Tina is the Director of Account Management with IcareLabs and was named one of the top influential women in optical for 2021. She has 30+ years of experience in the optical industry and 10+ years working with IcareLabs.

Aspheric lenses offer significant advantages for individuals with higher prescriptions. Traditionally, strong prescriptions require thicker lenses, which often lead to unflattering cosmetic appearances and visual distortions at the lens periphery. Aspheric lenses, with their ability to reduce peripheral distortion, provide a more natural and visually appealing appearance. By maintaining consistent thickness throughout the lens, these lenses allow wearers to enjoy better visual acuity while benefiting from thinner, lighter, and more aesthetically pleasing eyewear.