The earliest LCDs were twisted nematic (TN) panels. The crystals are arranged in a twisted, helical configuration. While twisted, they allow light to pass through, but when they’re activated, the crystals untwist and block the backlight. Combined with a color filter over subpixels, this process produces all the wavelengths necessary for color images.
LCD: The Basics
Liquid crystal displays (LCDs) use a layer of liquid crystals to produce colored light. These panels require a backlight that shines white light through the liquid crystal array. When an electric current is applied to the liquid crystals, they either block or allow specific wavelengths—red, green, or blue—to pass through, creating the colors you see on the screen.
