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The Difference between OLED and TFT

2022-09-05

Thin Film Transistor (TFT Thin Film Field Effect Transistor) means that each liquid crystal pixel point on a liquid crystal display is driven by a thin film transistor integrated behind it. So that it can achieve high speed, high brightness and high contrast display screen information, TFT-LCD (thin film transistor liquid crystal display) is one of most liquid crystal displays.


The basic structure of OLED is composed of a thin, transparent indium tin oxide (ITO) with semiconductor characteristics, connected to the positive electrode of electricity, plus another metal cathode, wrapped in a sandwich-like structure. The entire structural layer includes: hole transport layer (HTL), light emitting layer (EL) and electron transport layer (ETL). When the power supply is supplied to the appropriate voltage, the positive hole and cathode charge will be combined in the luminous layer to produce a bright light, according to its different formulations to produce red, green and blue RGB three primary colors, constituting the basic color. The characteristics of OLED are their own light, unlike TFT LCD, which requires backlight, so the visibility and brightness are high, followed by low voltage demand and high power saving efficiency, fast response, light weight, thin thickness, simple structure, low cost, etc. Although in the future, OLED with better technology will replace LCD such as TFT, organic luminescent display technology still has defects such as short service life and difficult screen large-scale.