On July 17, it was reported that the Central Research Institute of BOE Group had made a breakthrough in high-resolution QLED, and relevant papers had been published in Nano Research, an international authoritative academic journal. It is said that BOE QLED (quantum dot light-emitting diode) has reached 500PPI and 114% NTSC color gamut.

The tide of replacing LCD with AMOLED is still rolling forward, and the industry has long been looking for products that can surpass AMOLED. QLED, QD-OLED, Mini LED, Micro LED are all on the candidate list. But they are all in their own breakthrough process. After all, they can replace the existing technology only if they are very strong in display performance, power consumption, price and other aspects.

The reason why QLED (Quantum Dot Light Emitting Diode) meets the threshold of fineness is that they are stepless nanoparticles, which cannot be evaporated like OLED (Organic Light Emitting Diode). Most of them are produced by inkjet printing, and the latter generally cannot exceed 250PPI. This fineness problem makes it difficult for QLED to enter the field of mobile devices. After all, the iPhone SE 2's 326 PPI retina screen has been sprayed with large fruit grains in this era. The familiar outdated Plus series iPhone has a 5.5 inch 1080P LCD and a PPI of 401.

BOE's breakthrough this time is mainly to break through the resolution limit of inkjet printing, so that the PPI has directly doubled to more than 500PPI, and the color range has also reached 114% of the NTSC color gamut (the common sRGB can only cover about 72% of the NTSC color gamut). Of course, the color gamut is actually the traditional art of these new technologies.

What is the concept of 500PPI? This is close to the 2K screen on the phone. The Galaxy S20+is 525PPI, and the Note10+is 498PPI. However, there is still a gap with the top fineness. After all, the S20 of the small screen is as high as 563PPI, not to mention the 4K screen of Sony mobile phones. E-ink broke through 600PPI in 2017, and JDI's LCD exceeded 1000PPI in 2018. But even if it can't be used in mobile devices, it is also a big market for televisions. QLED is a new technology after all, and the future is full of hope.

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