Nationstar Optoelectronics is lighting up a 1.84-inch MicroLED display, named nStar III. It uses an LTPS-TFT (low-temperature polysilicon thin-film transistor) glass-based driver backplane. LTPS-TFT is a type of active matrix LCD technology where the backplane (which controls the screen pixels) is made using low-temperature polysilicon. This allows for smaller pixels and higher resolution displays compared to traditional amorphous silicon TFT. The pixel pitch here is 0.078mm, leading to a resolution of 360×480.
The use of a fully flip-chip substrate-less LED pixel light-emitting unit is noted by the company to emphasize that a substrate-less approach can reduce the thickness and potentially improve thermal performance. As such, the company claims the display can achieve a peak brightness of over 1500 nits.
Nationstar also claims a high-density integration of over 500,000 MicroLED chips with placement accuracy for RGB chips less than 2 micrometers and a transfer yield greater than 99.9%.
Nationstar is aiming to expand its product line with varying pixel pitches for different applications. It is also focusing on developing silicon-based AR (augmented reality) display technology, aiming to create a diversified MicroLED set of solutions.
