OLED (Organic Light-Emitting Diode) means that the screen consists of all small white LEDs (each pixel equals 1 LED). As a result, the display does not need a backlight and is much more economical in use. In addition, this gives a much higher contrast, making this display very clear and legible despite its size.
Dimensions: 27.8 x 27.3 x 4.3mm (hxwxd).
Screen dimensions: 19 x 27.3mm.