Liquid Crystal Display

 

A display that consists of two polarizing transparent panels and a liquid crystal surface sandwiched in between. Voltage is applied to certain areas, causing the crystal to turn dark. A light source behind the panel transmits through transparent crystals and is mostly blocked by dark crystals.

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See fluidentity.

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A semiconductor device that converts electrical energy into electromagnetic radiation. The LED emits light of a particular frequency (hence a particular color) depending on the physical characteristics of the semiconductor used. See electroluminescence.

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A semiconductor device that emits visible light when an electric current passes through it. The light is not particularly bright, but in most leds it is monochromatic, occurring at a single wavelength. The output from an LED can range from red (at a wavelength of ~700nm) to blue-violet (~400nm).

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Technology used for displays in notebook and other smaller computers. Lcds allow displays to be much thinner than cathode ray tube technology. Lcds consume much less power because they work on the principle of blocking light rather than emitting it.

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A sandwich structure of two semi-conductors (p-n-junction). Light of a specific wavelength or colour is emitted from this junction when a current runs through it. The colour can be adjusted by choosing different semi-conductors and process engineering.

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The orientational properties of liquid crystals (LC) can be used to create a display. The relative orientation of the molecules in one pixel of the LC-layer can be adjusted by applying a voltage. When this layer is placed between two polarisers the intensity of light passing through it can be adjusted by rotating the molecules in the LC-layer. Thus the brightness of each pixel of the display can be selectively controlled.

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Work on a completely different concept. Traditionally leds are created from two semiconductors. By running current in one direction across the semiconductor the LED emits light of a particular frequency (hence a particular color) depending on the physical characteristics of the semiconductor used. The semiconductor is covered with a piece of plastic that focuses the light and increases the brightness. These semiconductors are very durable, there is no filament, they don?¬t require much power, they?¬re brighter and they last a long time. By densely packing red, blue and green leds next to each other on a substrate one can create a display. The disadvantage of leds is that they are much larger ?± therefore the resolution is not nearly as good as LCD displays. That?¬s why most LED displays are large, outdoor displays, not smaller devices, like monitors. OLED or Organic LED is not made of semiconductors. It?¬s made from carbon-based molecules. That is the key science factor that leads to potentially eliminating leds?¬ biggest drawback ?± size. The carbon-based molecules are much smaller. And according to a paper written by Dr. Uwe Hoffmann, Dr. Jutta Trube and Andreas Klâ€"ppel, entitled OLED - A bright new idea for flat panel displays ?¬OLED is brighter, thinner, lighter, and faster than the normal liquid crystal (LCD) display in use today. They also need less power to run, offer higher contrast, look just as bright from all viewing angles and are - potentially - a lot cheaper to produce than LCD screens.?® LCD, LED, and OLED definitions courtesy The San Francisco Consulting Group (SFCG)

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Is the predominant technology used in flat panel displays. The principle that makes the display work is this: A crystal?¬s alignment can be altered with an electric current. If the crystal is lined up one way ?± it will allow the light waves to pass through a polarized filter, but if the electric current alters the crystal?¬s alignment, it will guide light so that the polarized filter blocks the light. By densely packing red, blue and green light emitting crystals next to each other on a sheet (?¬called a substrate?®), one can create a full color display. The great thing about LCD is that the crystals can be packed together closely, allowing for a higher-resolution, finer-detail display. The con is that lcds are somewhat fragile, require a lot of power and are relatively less bright.

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Is the predominant technology used in flat panel displays. The principle that makes the display work is this: a crystal alignment can be altered with an electric current. If the crystal is lined up one way - it will allow the light waves to pass through a polarized filter, but if the electric current alters the crystal alignment, it will guide light so that the polarized filter blocks the light. By densely packing red, blue and green light emitting crystals next to each other on a sheet, one can create a full color display. The great thing about lcd is that the crystals can be packed together closely, allowing for a higher-resolution, finer-detail display. The con is that lcds are somewhat fragile, require a lot of power and are relatively less bright

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Technology used for displays in notebook and other smaller computers. Lcds allow displays to be much thinner than cathode ray tube technology. Lcds consume much less power because they work on the principle of blocking light rather than emitting it.

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A semiconductor device that emits visible light when an electric current passes through it. The light is not particularly bright, but in most leds it is monochromatic, occurring at a single wavelength. The output from an LED can range from red (at a wavelength of ~700nm) to blue-violet (~400nm).

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Is the predominant technology used in flat panel displays. The principle that makes the display work is this: A crystalís alignment can be altered with an electric current. If the crystal is lined up one way ń it will allow the light waves to pass through a polarized filter, but if the electric current alters the crystalís alignment, it will guide light so that the polarized filter blocks the light. By densely packing red, blue and green light emitting crystals next to each other on a sheet (ěcalled a substrateî), one can create a full color display. The great thing about LCD is that the crystals can be packed together closely, allowing for a higher-resolution, finer-detail display. The con is that lcds are somewhat fragile, require a lot of power and are relatively less bright.

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