How does a picture appear on the screen of a T.V , mobile , laptop and a cinema theatre ?
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The cathode-ray tube (CRT) is the main component of all kinds of display-based electronics like the television, laptop, smartphones, tablets, projector, or in a cinema theatre screen.
The latest development is the usage of Liquid crystal displays (LCDs) which are light-weight, compact, portable, cheap, reliable, and easier on the eyes than cathode ray tube screens.
LCD screens use a thin layer of liquid crystal, a liquid that exhibits crystalline properties. It is sandwiched in between two electrically conducting plates. The top plate is deposited with transparent electrodes and the back plate is illuminated so that the viewer can view the images on the screen.
Applying controlled electrical signals across these plates activates various segments of the liquid crystal. This causes changes in their properties of light diffusion or polarization. These segments can either transmit light or block light. An image is produced by passing light through selected segments of the liquid crystal to the viewer.
The latest development is the usage of Liquid crystal displays (LCDs) which are light-weight, compact, portable, cheap, reliable, and easier on the eyes than cathode ray tube screens.
LCD screens use a thin layer of liquid crystal, a liquid that exhibits crystalline properties. It is sandwiched in between two electrically conducting plates. The top plate is deposited with transparent electrodes and the back plate is illuminated so that the viewer can view the images on the screen.
Applying controlled electrical signals across these plates activates various segments of the liquid crystal. This causes changes in their properties of light diffusion or polarization. These segments can either transmit light or block light. An image is produced by passing light through selected segments of the liquid crystal to the viewer.
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