By: Shasidhar Vadlamudi
What are OLED, LCD, Plasma, QLED, and LED screens!? These must mean something right, as we seem to see them everywhere, and what do all those letters mean? These acronyms represent the different TV screens you can buy, and knowing them can help individuals be more informed customers.
LCD- They are the most common TV screen and stand for Liquid Crystal Display. The crystals are switched on and off electronically producing different hues of light. The crystals do not produce light themselves but reflect the light being produced by a backlight.
Plasma- Plasma is basically when gas is heated so much that the electrons detach and and the atoms become ionized. A plasma TV has an electrical circuit that turns on and off a grid of red, green, blue lights which are microscopic.
LED-An LED screen is actually an LCD screen, but instead of having a normal CCFL backlight, it uses light-emitting diodes as a source of light behind the screen. An LED is more energy efficient and a lot smaller than a CCFL, enabling a thinner television screen. There is ironically no picture quality improvement over a normal LCD screen despite the LED’s increased efficiency.
QLED-Quantum Dot TV Tech works by placing a layer or film of quantum dots in front of a regular LED backlight panel. The layer is made up of tiny particles, each of which emits its own individual color depending on its size. Specifically, the size of the particle dictates the wavelength of light that it emits, hence the different colors.
OLED-Organic Light Emitting Diode also known as OLED is extremely expensive. OLEDs work in a similar way to conventional diodes and LEDs, as they use organic molecules to produce their electrons and holes. A simple OLED is made up of six different layers. On the top and bottom there are layers of protective glass or plastic. The top layer is called the seal and the bottom layer the substrate. In between those layers, there is a negative terminal and a positive terminal. Finally, in between the anode and cathode are two layers made from organic molecules called the emissive layer and the conductive layer.