As the current display material with the highest color reproduction, the application of quantum dots in direct display products is rapidly advancing. Saphlux relies on globally unique nanoporous quantum dots (NPQDs) ®） The patented technology has achieved in-situ integration of MLED chips and quantum dots, and has been successfully applied to the commercial production of quantum dot red light chips. It has been widely implemented in quantum dot COB direct display products, covering an area of thousands of square meters. Recently, Saifules has successively launched quantum dot MLED products in customized bands such as yellow and green light, breaking through the limitations of traditional red, blue, and green chips and promoting the industry into a new era of chip color adjustment.
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Figure 1 Real time shooting of quantum dot green, yellow, and red MLED chips
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Figure 2: Wavelength Modulation Range of Quantum Dot MLED Chip
Quantum dot green chip: solving the problem of traditional green light uniformity and achieving Rec.2020 color gamut standard
Quantum dot green light chips based on blue light excitation will enter mass production in the near future. This chip achieves almost 100% coverage of Rec.2020 color gamut standard green light output, and wavelength consistency is controlled within ± 1nm within a 4-inch wafer range, significantly better than traditional InGaN green light chips, and has significant advantages in overall color uniformity. At present, the 0307 size quantum dot green chip has passed the full set of reliability tests for high-end COB samples with a spacing of P0.7 and below, and will be launched on the market in the second half of the year.
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Figure 3 Schematic comparison of uniformity between InGaN green light and quantum dot green light
Quantum dot yellow light chip: portrait master, assisting virtual shooting and high-end design
Saifules has completed the sample delivery of 580nm wavelength yellow quantum dot MLED chip, with an external quantum efficiency exceeding 8%. By integrating with traditional RGB chips, an RGB+Y four-color pixel structure is constructed. The four-color pixel structure is specifically designed for high-end virtual shooting screens, professional and design applications that require extremely high requirements for skin tone restoration and high fidelity image restoration. It can significantly enrich portrait details and greatly improve display quality.
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Figure 4 Comparison of RGB+Y four-color pixel structure color gamut and DCI-P3 standard
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Figure 5 Comparison of RGB+Y four-color pixel structure screen and traditional screen effects in real photos
Three in one RGB chip: Single chip tri color, bringing the ultimate solution for cost reduction and efficiency improvement
In the highly integrated direction, Saifules is advancing the development of the "RGB in One" three in one chip. This technology integrates red and green quantum dot materials onto a single blue MicroLED chip to achieve full-color RGB display on a single chip. This solution effectively simplifies the chip transfer and solidification process, reduces equipment investment costs, repair costs, and about 60% transfer costs, while significantly improving pixel consistency and overall screen image stability, bringing a new breakthrough path for MicroLED high-precision display.
Figure 6: Real time shot of Saifules RGB in One three in one chip wafer (partial)
Red light chip: environmentally friendly color free, high-end large screen and CAVE killer solution
The R series red light chips produced by Sefules adopt a quantum dot color conversion scheme, which has more accurate color point positions, narrower half peak widths, and stronger temperature and current stability compared to traditional AlInGaP chips. In COB packaging, due to the consistent substrate of the red, green, and blue chips, the entire screen is almost colorless under a large viewing angle.
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Figure 7 Core advantages of quantum dot red light chip
Data shows that under the same system configuration, the color temperature change amplitude of QD-COB screen at a maximum viewing angle of 85 ° is more than 15 times lower than that of traditional COB screen; In high-end immersive scenes such as CAVE, the color cast at a 60 ° side view angle has been reduced from the traditional 15% to less than 3%, and the color accuracy has been improved by more than 5 times, greatly improving the immersive experience.
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NPQD ® QD-COB CAVE vs. Traditional COB CAVE
The QD-COB quantum dot direct display products made using R series quantum dot red light chips have not only been applied in traditional and emerging high-end commercial display scenarios, but also help more display products break through the original technical difficulties. Recently, Saifules used QD-COB products to help a customer's LCD screen seamless splicing solution. Its large angle and high color accuracy advantages are matched with the LCD's own large viewing angle, and as a seam part, it helps eliminate black seams on the LCD screen. This solution breaks the traditional LCD size limit, balances immersive viewing and cost control, and expands the new application boundaries of QD technology in the commercial display field.
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Figure 8: QD-COB as an LCD Connection Part Helps with Large LCD Display Solution
Dr. Song Jie, Vice President of Technology at Sefules, stated that the unique nanopore structure provides a stable and efficient packaging environment for quantum dots, significantly improving light efficiency output and chip reliability, laying a solid foundation for the large-scale application of quantum dots in COB direct display. At present, Saifules has established a mature and efficient mass production system for quantum dot MLED chips. With the continuous breakthroughs in quantum dot material technology, we will launch quantum dot chips with more wavelength options. We are confident in working with partners from various industries to jointly develop more high-quality quantum dot direct display products. ”
Lu Changjun, partner of Saifules and Chief Technology Officer of Liade Group, said: "In the past year, the outstanding performance of QD-COB direct display products in the terminal market is evident, and with excellent color reproduction ability and outstanding differentiation positioning, they have won widespread market recognition. This year, Liard has launched a new MG NPQD ® The cold screen series products have achieved further optimization in chip packaging and system design, and have formed a collaborative progress with Safran, injecting new vitality into the COB commercial display market. In the future, Liad hopes to accelerate the landing of more terminal products, expand diversified small pitch differentiated direct display products, and even layout the home market through multi-color, three in one and other types of quantum dot chips
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