At a mere 2 square micrometers in size, this is the world's smallest QR code and it's 'smaller than most bacteria'

The QR code is so small, in fact, that it can "only be recognised with an electron microscope". As a result, the research ...
IEEE

Luminous Properties of Double-Side-Emitting LED Displays Employing All-in-One Devices

Abstract: Single-side-emitting LED displays have been widely utilized in various applications, but they have inherent limitations when it comes to scenarios requiring display content on both sides ...