LCD, short for Liquid Crystal Display, is a type of display panel that uses an array of polarizing filters, color filters, electrical conductors and liquid crystal to display images and videos. The alignment of the liquid crystals changes as electricity is sent to them, changing the amount and polarity of light let through the display panel. The light (which comes from the backlight inside of the display) is sent through two polarizing filters, which block any light that the layer of liquid crystal does not affect.
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LED is sometimes used for conventional LCD displays that use an LED backlight; however, in the video wall world, LED refers to Direct View LEDs. Instead of light passing through a membrane, the pixels in an LED wall generate the light themselves. Each pixel contains a red, green, and blue LED (RGB), each of which adjust their brightness to display different colors.
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Organic LED, or OLED, is sort of a hybrid between LCD and LED displays. A membrane system, like LCD, is used, but instead of allowing light through a filter, light is generated by the pixels. This allows for higher contrast in dark rooms, and better viewing angles than LCD panels. However, direct view LED panels provide the same contrast, but are less expensive and provide a better viewing experience when it comes to larger sizes. Direct View LED is also starting to appear in the consumer market, commonly referred to as MicroLED.
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