In its simplest form, a microdisplay is a very small display that measures 0.75 to 1 inch from corner to corner. OLED microdisplays can be produced in extremely small sizes by employing circuits on a silicon backplane to control the individual pixels. These circuits’ very small size makes it possible to produce images with incredibly high resolution. The iPhone 12 has a resolution of 460 pixels per inch, for instance (PPI).