Much like transistors, LEDs are reaching a limit to how small they can be while also performing effectively. This is especially noticeable in close-range displays such as augmented-reality (AR) and virtual-reality (VR) devices, where limited pixel density results in a ‘screen door effect’ such that users perceive stripes in the space between pixels...
Source: https://www.semiconductor-today.com/new ... 0223.shtml