MIT has developed a vertically stacked MicroLED technology that pushes pixel density up to 5000 PPI, according to a recent paper published in Nature. PPI.
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.
