TN (Twisted Nematic) is a subtype of LCD (Liquid Crystal Display) technology, not a standalone category. To clarify:
LCD Basics: All LCDs rely on liquid crystals to modulate light, requiring a backlight to produce images. The two main LCD subcategories are based on liquid crystal alignment: TN, IPS (In-Plane Switching), and VA (Vertical Alignment).
TN as an LCD Technology: TN panels use a specific liquid crystal orientation (twisted at 90 degrees) to control light transmission. The "LED" distinction in displays typically refers to the backlight type, not the panel technology. For example, a modern TN monitor might use an LED backlight (replacing older CCFLs), but it remains an LCD panel at its core.
Key Difference: "LED" in displays often denotes the backlight (e.g., LED-backlit LCD), while "TN" describes the liquid crystal arrangement. Thus, a TN screen is always an LCD, but its backlight can be LED or CCFL.
