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Graphics Tablet and LCD Monitor
What is an LCD Monitor ?
A liquid crystal display (LCD) monitor is a flat monitor that uses LCD technology to show clear images, and is found mostly in laptops , projector screens and flat screen TV monitors.
It is used worldwide. This technology replaced the cathode ray tube (CRT) monitors, which were the previous standard.
Some examples of CRT monitors are the big old TV’s had CRT monitors, With the introduction of better LCD technology and its continuous improvement, LCD is now the clear leader over CRT, in terms of colour and picture quality, not to mention capabilities for large resolutions. Also, LCD monitors may be made much more cheaply than CRT monitors. This is an output device.
How does an LCD Monitor work technically ?
- LCD screens are an array of small segments called pixels, which can be manipulated for information displaying.
- Such displays have several layers, where two panels, made of glass material free of sodium and called substrate, play a crucial role. The substrate contains a thin layer of liquid crystals between them.
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-The panels have flutes that direct the crystals, giving them a distinctive orientation. Flutes are parallel on each panel but are perpendicular between the two of them. Longitudinal flutes are obtained as a result of placing on the glass surface thin films of transparent plastic, which are then processed in a particular way.
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- In contact with the flutes, the molecules are oriented identically in all the cells. The liquid crystal panel is illuminated by a light source, depending on where it is located, as the LCD panels operate on reflection or light transmission. The plane of polarization of the light beam is rotated by 90° as one panel passes. When an electric field appears, the molecules are partially aligned along it, and the angle of rotation of the plane of polarization of light becomes different from 90°.
- By producing screen LCD screen technology, the backlight of the monitor is used to output a color image so that light is generated at the back of the LCD Monitors. It is necessary to be able to have a picture with good quality, even if it is dark. The color is obtained using three filters, which distinguish three principal components from the radiation of a white light source. By combining the three primary colours for each pixel of the screen, you can reproduce any colour.
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