Moniter

                                           

                                             Moniter

* Moniter :- It is look like a TV (Telivision) screen on which the output is displayed. It Displays the instruction send to and also the slut back to the user. A Moniter is usually associated with a keyboard and together they form a video display terminal (VDT).

Video display terminal (VDT)
A VDT is most popular input and output device used with today computer. That is it act both input and output device.

Types of Moniters :-

CRT (cathode ray tube) monitors.
LCD (liquid crystal display) monitors.
TFT (thin film transistor) Monitor.
LED (light-emitting diodes) Monitors.
DLP (Digital Light Processing) Monitor.
Touchscreens Monitor.
Plasma Screen Monitor.
OLED Monitors.

(1) CRT (cathode ray tube) monitors :-  A vacuum tube used as a display screen in a computer monitor or TV. The viewing end of the tube is coated with phosphors, which emit light when struck by electrons. In the past, CRT was a popular term for a computer display terminal.

(2) LCD (liquid crystal display) monitors :- liquid crystal display is a flat, thin display device that has replaced the older CRT display. LCD provides better picture quality and support for large resolutions.
Generally, LCD refers to a type of monitor utilizing the LCD technology, but also flat-screen displays like those in laptops, calculators, digital cameras, digital watches, and other similar devices.

(3) TFT (thin film transistor) Monitor :- a type of LCD flat-panel display screen, in which each pixel is controlled by from one to four transistors. The TFT technology provides the best resolution of all the flat-panel techniques, but it is also the most expensive. TFT screens are sometimes called active-matrix LCDs.

(4) LED (light-emitting diodes) Monitors :- An LED is an electronic device that emits light when an electrical current is passed through it. Early LEDs produced only red light, but modern LEDs can produce several different colors, including red, green, and blue (RGB) light. Recent advances in LED technology have made it possible for LEDs to produce white light as well.
LEDs are commonly used for indicator lights (such as power on/off lights) on electronic devices. They also have several other applications, including electronic signs, clock displays, and flashlights. Since LEDs are energy efficient and have a long lifespan (often more than 100,000 hours), they have begun to replace traditional light bulbs in several areas. Some examples include street lights, the red lights on cars, and various types of decorative lighting. You can typically identify LEDs by a series of small lights that make up a larger display. For example, if you look closely at a street light, you can tell it is an LED light if each circle is comprised of a series of dots.
The energy efficient nature of LEDs allows them to produce brighter light than other types of bulbs while using less energy. For this reason, traditional flat screen LCD displays have started to be replaced by LED displays, which use LEDs for the backlight. LED TVs and computer monitors are typically brighter and thinner than their LCD counterparts.

(5) DLP (Digital Light Processing) Monitor :- DLP is a technology developed by Texas Instruments used for projecting images from a monitor onto a large screen for presentations. Prior to the development of DLP, most computer projection systems were based on LCD technology which tends to produce faded and blurry images. DLP uses tiny mirrors housed on a special kind of microchip called a Digital Micromirror Device (DMD). The result is sharp images that can be clearly seen even in a normally lit room.

(6) Touchscreens Monitor :- A touch screen is a computer display screen that is also an input device. The screens are sensitive to pressure; a user interacts with the computer by touching pictures or words on the screen. ... Resistive touch screen panels are not affected by outside elements such as dust or water.

(7) Plasma Screen Monitor :- plasma display is a television, usually larger in size, ranging from 40-inches to 65-inches. Other sizes may be available, but are less common.
Plasma screens are similar to LCD and LED televisions in that they are flat-panel, thin and are capable of being mounting on a wall. A plasma screen is made up of many tiny cells containing noble gases and a tiny amount of mercury. These cells are between two pieces of glass and electricity is passed through the cells, causing the gases to turn into plasma. Light is then emitted, generating a picture on the screen. Plasma screens support high resolutions of up to 1920 x 1080, have excellent contrast ratios, wide viewing angles, and high refresh rates that reduce video blur. They are excellent for fast action movies and sports games and overall provide for an excellent viewing experience.

(8) OLED Monitors :- OLED monitors are flat computer displays which consist of pixels made from OLEDs (Organic Light Emitting Diodes) rather than liquid crystal filled units. Unlike LCD (Liquid Crystal Display) technology, OLED does not require backlighting to function. The principle of this technology is that when current flows between a cathode and an anode, an emissive layer of organic molecules (e.g. polyaniline, green in diagram) sandwiched between these electrodes can become illuminated (electroluminescence). For this to happen efficiently, a layer known as the conductive layer (orange in diagram), made up of organic plastic molecules such as polyfluorene, lies between the emissive layer and the anode. The anode is positively charged and therefore draws electrons from the conductive layer, leaving the conductive layer with a positive charge that draws electrons from the emissive layer. Light is emitted as a by-product, in a process known as electrophosphorescence. The OLED process is explained in the diagram below.