![]() ![]() ![]() Here electrons are recombined with the holes by releasing energy in the form of photon of light. At the boundary of emissive and conductive layers, electrons and the holes are gathered. The cathode give electrons to the emissive layer of organic molecules while the anode takes equivalent electrons from the conducting layer of organic molecules. When an appropriate voltage is applied, an electric current flows from cathode to anode through the organic layers. The organic layer consists of a hole-injection layer, a hole-transport layer, an emissive layer and an electron-transport layer. The heart of the OLED display is a stack of thin organic layers which is sandwiched between two conductors – a transparent anode and a metallic cathode, which in turn are sandwiched between two glass plates known as seal and substrate. There are three different colored phosphors (Red, Green and Blue) for each pixel and the color of the pixel depends on the phosphor on which the electrons strike. When electrons strikes the phosphor coated screen passing through a mesh (shadow mask or aperture grill), the phosphor lights up making a displayable dot on the computer screen. This directs the electrons towards the correct part of phosphor coating inside the display glass. When electrons (cathode rays) pass through the magnetic anodes, they are pushed or pulled in one direction or other depending on the magnetic field on the anodes. At the middle of the monitor, there are magnetic anodes which are magnetized in accordance with the instruction from the display controller. This stream of electrons is also known as cathode rays. The electron gun fires a stream of electrons towards the display screen through a vacuum tube. As shown in the image CRTs have a conical shape and there is an electron gun or cathode ray gun at the back end of the monitor and a phosphor screen in the front. ![]()
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