The improvement of red light brightness is the most difficult challenge facing the MicroLED industry. JBD said that it determined the direction of hybrid integrated semiconductor technology at the beginning of its establishment and adhered to the AlGaInP red light technology route. AlGaInP is the key to achieving high-performance red light. It has a bandgap that best matches red light and is the most mature semiconductor material used in the industry to make red LEDs.

MicroLED red light lighting diagram

According to reports, the red light achieved 1 million nits brightness this time, thanks to JBD’s major breakthroughs in multiple technologies, including material growth technology, non-radiative composite suppression technology, and beam divergence angle control.

MicroLED brightness changes with driving current

The new generation of ultra-thin AlGaInP epitaxial technology and matching chip passivation technology are the keys to improving the brightness of red MicroLEDs. It is reported that the pixel size of JBD red light is 4um, while the size of the emitting LED is <2um, which also puts forward more stringent requirements for luminous efficiency. The advancement of AlGaInP epitaxial technology has greatly weakened the influence of non-radiative recombination on the surface of MicroLED, delaying the trend of rapid attenuation of the light efficiency of red MicroLED under the size of <5um; combined with chip passivation technology, it has further broken through the red light size effect bottleneck, resulting in a huge improvement in internal quantum efficiency.

JBD has also made major breakthroughs in pixel optical technology. The new generation pixel optical structure not only optimizes the anti-reflection coating system to improve optical extraction efficiency, but also further optimizes the micro-lens structure to achieve a significant improvement in small-angle beam collimation efficiency. the brightness level. As a result, JBD has achieved a product-level million-nit red light panel. The important thing is that this is achieved under normal power consumption, that is, the IC driver reaches the rated power consumption, not in overdrive mode.

Single pixel beam divergence angle comparison

In 2021, the brightness of red light reached 300,000 nits for the first time; in 2022, it exceeded 500,000 nits; in February 2023, it was raised again to 750,000 nits, paving the way for the mass production of the “Hummingbird” full-color light engine; in 2023 In September, it officially exceeded the 1 million nit mark.

As mentioned above, advances in red light technology have brought the application potential of the JBD “Hummingbird” X-cube color-combining light engine to new heights. The “Hummingbird” color light engine has the characteristics of an ultra-small size of 0.4cc, a weight of only 1g, and ultra-low power consumption of 200mW. It has an absolute leading edge in consumer-grade AR full-color display solutions. Previously, JBD has achieved MicroLED blue light brightness of 1 million nits and green light brightness of 5 million nits. As the red light achieves 1 million nits brightness, the output brightness of the “Hummingbird” color light engine has also increased from 3-4lm to more than 5lm, reaching an ultra-high lumen efficiency per unit volume of 12.5lm/cc.

JBD said that it will rely on the mass-produced “Hummingbird” full-color light engine solution to comprehensively promote the development of the consumer AR glasses ecosystem. A number of new products based on this solution will be launched soon, and more information will be disclosed by then.

To truly make AR glasses the same as ordinary glasses, the key is to make the microdisplay small enough to fit into the temples and project bright, clear and full-color images on the lenses. MicroLED microdisplay technology Maturity makes it possible, shortens the distance between people and the metaverse, and brings it one step closer to commercialization.

According to the data, JBD was founded in 2015 and is headquartered in Pudong, Shanghai. It has been focusing on the R&D and production of MicroLEDs below 0.5 inches. It has independent IC design, MOCVD material growth, MicroLED hybrid integration technology processing and manufacturing, packaging testing, software and hardware drivers design, optical module and other technologies. Currently, it has laid out hundreds of related patents around the world in the field of MicroLED microdisplays, mainly providing products and solutions for near-eye display AR, automotive head-up display HUD, micro projectors, 3D printing, sports optics, square displays and other applications. Already cooperated customers include many consumer electronics giants around the world. For example, the exploratory version of smart glasses exposed by Xiaomi in 2021 uses JBD’s Micro LED solution. In terms of products, JBD has invested in MicroLED research and development in 2015. JBD released its first prototype product in 2018, mass-produced the first-generation monochrome standard product in 2021, and successively released color optical machines in 2022 and 2023.

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The post JBD red MicroLED brightness exceeds 1 million nits, breaking industry record appeared first on TechGoing.

The research was led by Jeehwan Kim, an engineering professor who specializes in ultra-thin, high-performance films. The team built on past research to fabricate membranes with red, green and blue sub-pixels on a two-dimensional membrane material.

The films were next peeled from a rigid base layer and then stacked together to form vertical full-color pixels only 4 microns wide.

This is the smallest microLED pixel and the highest pixel density reported in the journal,” said Jeehwan Kim. And stacking colors is just the first step. The team’s in-depth study found that by varying the input voltage, they were able to produce multiple colors in each stacked pixel. But to control 25 million individual LEDs required a sophisticated system. This is one of the team’s future developments.

The post MIT develops vertically stacked MicroLED technology appeared first on TechGoing.