All Topics  
Computer display

 
Computer Display

 
   Email Print
   Bookmark   Link
 

 

Computer display
 
 
  Topics Computer display Topic Home

A visual display unit, often called simply a monitor or display, is a piece of electrical equipment
Electrical equipment

Electrical equipment includes any machine powered by electricity. They usually consists of an enclosure , a variety of electrical components, and often a power switch....
 which displays images generated from the video
Video

Video is the technology of electronics Videography, recording, processing, storing, transmitting, and reconstructing a sequence of still images representing Scene in motion....
 output of devices such as computer
Computer

A computer is a machine that manipulates Data according to a list of Code .The first devices that resemble modern computers date to the mid-20th century , although the computer concept and various machines similar to computers existed earlier....
s, without producing a permanent record. Most newer monitors typically consist of a TFT LCD
TFT LCD

File:Flat monitor.svgA thin film transistor liquid crystal display is a variant of liquid crystal display which uses thin film transistor technology to improve image quality ....
, with older monitors based around a cathode ray tube
Cathode ray tube

The cathode ray tube is a vacuum tube containing an electron gun and a fluorescent screen, with internal or external means to accelerate and deflect the electron beam, used to create images in the form of light emitted from the fluorescent screen....
 (CRT). The monitor comprises the display device, simple circuitry
Electronic circuit

An electronic circuit is a closed path formed by the interconnection of electronic components through which an electric current can flow. The electronic circuits may be physically constructed using any number of methods....
 to generate and format a picture from video sent by the signals
Signal (electrical engineering)

In the fields of telecommunications, signal processing, and in electrical engineering more generally, a signal is any time-varying or spatial-varying quantity....
 source, and usually an enclosure
Computer case

A computer case is the enclosure that contains the main components of a computer. It has also been erroneously called the CPU, however this is an entirely different component....
.






Discussion
Ask a question about 'Computer display'
Start a new discussion about 'Computer display'
Answer questions from other users
Full Discussion Forum



Recent Posts

In the old days of computers, there were dials just under the center front of the monitor that allow...








Encyclopedia


A visual display unit, often called simply a monitor or display, is a piece of electrical equipment
Electrical equipment

Electrical equipment includes any machine powered by electricity. They usually consists of an enclosure , a variety of electrical components, and often a power switch....
 which displays images generated from the video
Video

Video is the technology of electronics Videography, recording, processing, storing, transmitting, and reconstructing a sequence of still images representing Scene in motion....
 output of devices such as computer
Computer

A computer is a machine that manipulates Data according to a list of Code .The first devices that resemble modern computers date to the mid-20th century , although the computer concept and various machines similar to computers existed earlier....
s, without producing a permanent record. Most newer monitors typically consist of a TFT LCD
TFT LCD

File:Flat monitor.svgA thin film transistor liquid crystal display is a variant of liquid crystal display which uses thin film transistor technology to improve image quality ....
, with older monitors based around a cathode ray tube
Cathode ray tube

The cathode ray tube is a vacuum tube containing an electron gun and a fluorescent screen, with internal or external means to accelerate and deflect the electron beam, used to create images in the form of light emitted from the fluorescent screen....
 (CRT). The monitor comprises the display device, simple circuitry
Electronic circuit

An electronic circuit is a closed path formed by the interconnection of electronic components through which an electric current can flow. The electronic circuits may be physically constructed using any number of methods....
 to generate and format a picture from video sent by the signals
Signal (electrical engineering)

In the fields of telecommunications, signal processing, and in electrical engineering more generally, a signal is any time-varying or spatial-varying quantity....
 source, and usually an enclosure
Computer case

A computer case is the enclosure that contains the main components of a computer. It has also been erroneously called the CPU, however this is an entirely different component....
. Within the signal source, either as an integral section or a modular component, there is a display adapter
Video card

A video card, also known as a graphics accelerator card, display adapter, or graphics card, is an expansion card whose function is to generate and output images to a display....
 to generate video in a format compatible with the monitor.

Screen size


Diagonal size

The size of a display is typically given as the distance between two opposite screen corners. One problem with this method is that it does not distinguish between the aspect ratios
Aspect ratio (image)

The aspect ratio of an is its width divided by its height.Aspect ratios are mathematically expressed as x :y and x?y . The most common aspect ratios used today in the presentation of films in movie theaters are 1.85:1 and 2.39:1....
 of monitors with identical diagonal sizes, in spite of the fact that a shape of a given diagonal span's area
Area

Area is a quantity expressing the two-dimensional size of a defined part of a surface, typically a region bounded by a closed curve. The term surface area refers to the total area of the exposed surface of a 3-dimensional solid, such as the sum of the areas of the exposed sides of a polyhedron....
 decreases as it becomes less square. For example, a 4:3 21" monitor has an area of ~211 square inches, while a 16:9 21" widescreen
Widescreen

A widescreen image is a film, computer or television image with a wider and shorter aspect ratio than the standard Academy frame developed during the classical Hollywood cinema era....
 has an area of only ~188 square inches.

This method of measurement is from the first types of CRT television, when round picture tubes were in common use. Being circular, they only needed to use their diameter to describe their tube size. When round tubes were used to display rectangular images, the diagonal measurement was equivalent to the round tube's diameter. This method continued even when CRT tubes were manufactured as rounded rectangles.

Another historically problematic practice is the direct measurement of a monitor's imaging element as its quoted size in publicity and advertising materials. Especially on CRT displays, a substantial portion of the imaging element is concealed behind the case's bezel or shroud in order to hide areas outside the monitor's safe area due to overscan
Overscan

Overscan is extra image area around the four edges of a video image that is not normally seen by the viewer. It exists because television sets in the 1930s through 1970s were highly variable in how the video image was framed within the cathode ray tube ....
. Seen as deceptive, widespread consumer objection and lawsuits eventually forced most manufacturers to instead measure viewable size
Viewable image size

On a computer monitor, the viewable image size or VIS is the actual amount of screen space that is available to display a picture, without obstruction from the case or other aspects of the unit's design....
.

Imaging technologies