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what is Displays :
A display is a computer output surface and projecting mechanism that shows text and often graphic images to the computer user, using a cathode ray tube ( CRT ), liquid crystal display ( LCD ), light-emitting diode, gas plasma, or other image projection technology. The display is usually considered to include the screen or projection surface and the device that produces the information on the screen. In some computers, the display is packaged in a separate unit called a monitor . In other computers, the display is integrated into a unit with the processor and other parts of the computer. (Some sources make the distinction that the monitor includes other signal-handling devices that feed and control the display or projection device. However, this distinction disappears when all these parts become integrated into a total unit, as in the case of notebook computers.) Displays (and monitors) are also sometimes called video display terminals (VDTs) . The terms display and monitor are often used interchangably.
Most computer displays use analog signals as input to the display image creation mechanism. This requirement and the need to continually refresh the display image mean that the computer also needs a display or video adapter . The video adapter takes the digital data sent by application programs, stores it in video random access memory ( video RAM ), and converts it to analog data for the display scanning mechanism using an digital-to-analog converter
Types of Displays :
1. Electroluminescent Display :
Electroluminescent display is a flat panel display that works on the principle of electroluminescence. Electroluminescence is a phenomenon where materials can emit light in response to the electric current. To make use of this phenomenon, electroluminescent display uses gallium arsenide (GaAs) as an electroluminescent material. The basic structure of electroluminescent display consists of electrode layers at the top and bottom. Active Matrix, Thin Film and Thick Dielectric are the three types of electroluminescent displays
2. Electronic Paper :
also known as e-paper is a term for display technologies resembling a paper. The popularity of the display is due to its contrast, thickness, readability and flexibility.
3. LED Display:
It is a type of display that uses light emitting diodes. This flat panel display is today used in many applications like to display traffic signs, displays of railway stations, television display etc. One of the largest LED display in the world is located in China, which is 500m long. Also the largest LED television is the Center Hung Video Display at Cowboys Stadium. This television has dimensions of 49m x 22m.
4. Liquid Crystal Display(LCD) :
This display generally depends upon the light modulating properties of liquid crystals. The low power consumption makes it good to use in all types of electronic equipments that are battery powered. LCDs are electronically modulated and are made of liquid crystals which are arrayed in front of the light source to produce images in color.
5. Plasma Display :
Plasma Displays is one of the display technologies that provides large screen sizes and better flat screen presentation. Good image qualities are one of its characteristic. Basically, plasma screens compose of large number of cells sandwiched between the panels made of glass. Between the glass panels there are display and address electrodes which form the grid. Electrodes intersect at a particular cell will get charged and excites neon and xenon gas within each cell.
6. Digital Light Processing Technology :
basically uses an optical semiconductor device known as Digital Micromirror Device. This device is a small light switch that can modulate the light through many microscopic mirrors arranged in a rectangular array. By using a DMD, digital video, light source, projection lens and mirrors this DLP system can reflect a digital image to the surface. When the mirrors tilt towards the light source, they are in the ON state otherwise they are OFF
7. Liquid on Silicon (LCoS) :
LCoS is a micro display technology that can be used in projection TVs, Eye displays etc. This technology uses a liquid crystal layer on top of the silicon backplane instead of the mirrors used in DLP system. The CMOS chip used will help to control the voltage on the plates, which is situated below the chip controlling the pixels.
8. Field Emission Display :
This is another popular flat panel display technology. It uses filed emission electron sources. These electron sources will strike the phosphor to produce colored images. Generally, FED consists of CRTs to form the RGB pixels. High contrast ratio, fast response time, less power, better packaging are some of its features.
9. Laser TV :
Laser TV also known as Laser color video display uses laser rays of different colors inorder to produce a spot. The spot is scanned and projected across the image plane. This process is done by using a polygon mirror set up.
10.Quantum Dot Display :
Quantum dot display is a type of display technology similar to the OLEDs. Here the light is supplied earlier, so that more efficient displays are obtained. Quantum dots are considered to be electro-active and photo-active which makes them to be a better display technology
11. Interferometric Modulator Display :
are a particular type of electronic visual displays that helps to create different colors by the interference property of the reflected light. One of the smart watches named Qualcomm Toq uses this type of display. IMOD displays consist of mirrors that can be made into ON or OFF states
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