OLED displays are not scanning/raster type displays. OLED displays consist of an organic material layer that is placed between two conductive electrodes, which is why OLED stands for Organic Light Emitting Diode. When an electric current is applied to the electrodes, the organic material emits light. The color of the light is determined by the type of organic material used. Since the display emits its own light, a backlight is not needed and therefore OLED displays can display very deep black levels.
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