OLED displays are not scanning/raster type displays like CRT or LCD displays. Instead, they use an emissive display technology where each individual pixel emits its own light, eliminating the need for a separate backlight like in LCD displays.

In OLED displays, each pixel is made up of an organic material that emits light when an electric current is applied to it. The color of the light emitted is determined by the specific organic material used. The pixels are arranged in an array, and when a voltage is applied to a specific pixel, it emits light, creating the image on the screen.

Unlike scanning/raster displays, OLED displays do not have a refresh rate or a scan rate. The individual pixels can be turned on and off instantly, allowing for fast response times and high contrast ratios. This is why OLED displays are often used in high-end smartphones and TVs, as well as in virtual reality and other immersive technologies where fast response times and high contrast are important.
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