How many types of Monitors are given below
Monitors are basically 3 types they are.
1. Cathode Ray Tubes (CRT)
2. Liquid Crystal Display (LED)
3. Light Emitting Diode (LED)
CRT can be defined as Cathode Ray Tube. The working of CRT is based on the moment of Electrons beams. And It is Defined as The CRT is Display Screen that produced images or pixels in the form of Video Signals. And it is the technology used in traditional computers. Most Desktops are displayed to make use of CRTs. A Cathode Ray Tube can consist of several components.
Liquid Crystal Display (LCD) monitors are flat panel displays that occupy less space. They are preferred over a CRT monitor because they are lightweight and consume less power. They produce flicker-free images on the screen so as to minimize the eyestrain by drawing the entire image at one time. They can be used in small devices such as laptops, calculators, watches, microwave ovens, and so on.
Working of LCD Monitor
The LCD monitor creates an image on the screen by making use of the light that is passed. It consists of two sheets of flexible polarizers named front polarizers and back polarizers. Between these two polarizers there exist a liquid crystal. This liquid crystal flows in the form of a liquid but the molecules present inside it get arranged in a fashion that gives a view of a crystal. It has the property that it can rotate the polarization of light when passed through it. But this property of the liquid crystal can be avoided by applying an electric field. The structure of an element is shown in the figure below. As described earlier it consists of two polarizes and a liquid crystal. Apart from these it also contains a reflector and electrodes.
From the above figure, it can be seen that the two polarizers are at an angle of90° to each other. Therefore, no light passes through them normally. But in the liquid crystal display, the light from the front polarizer passes through it at an angle of 90. The same light gets rotated at an angle of 90° by the liquid crystal present in the middle. Hence it hits the back polarizer. At this point, the light from the back polarizer will be reflected back from the reflector present behind the back polarizer. This reflected light passes through the crystal and front polarizer. Therefore, in this case, the light passed will get the return back without any absorption. This causes a silver mirror to form on the screen.
In such cases, the light from the front polarizer will not be rotated by the liquid crystal and hence it will get completely absorbed by the back polarizer. As a result of this, the screen appears to be black in color
Actually, The LED stands for ‘Light-Emitting Diode. The LEDs are producing infrared light have been in your remote controls for decades. The time display on your clock radio? Yup, those are LEDs as well. In this type of monitor, LEDs are the backlight A LED display is a flat panel display and that can use an array of light-emitting diodes as pixels for a video display. In recent years, they have also become commonly used in the destination signs on public transport vehicles, as well as variable-message signs on highways.
The LED displays can offer higher contrast ratios than a projector and are thus an alternative to traditional projection screens, and they can be used for large, uninterrupted (ie., without a visible grid can arise from the bezels of individual displays) video walls.