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What is Computer Monitor

Computer Monitor

A computer monitor is an output device that displays information in the form of an image. Typically, the monitor provides a visual display of processed results in our computer system.

In modern computer monitors, the display device is usually a transistor liquid crystal display (TFT-LCD) after the replacement of the LED cathode light bulb (CFL). Older monitors used a cathode ray tube (CRT).

Types of the computer monitor

  • CRT (Cathode Ray Tube)

Cathode ray tubes (CRT) used in the old computer monitors. Before the advent of home computers in the late 1970s, it was common to use a CRT video display terminal (VDT) on a keyboard and integrate the rest of the system components into a larger chassis.

A monochrome screen is much clearer and more accurate than a modern on-screen monitor, which required a lot of text and a very limited amount of information to display at one time. High-resolution CRT screens designed specifically for military, industrial and scientific use, but it were very expensive for general use.

  • LCD (Liquid Crystal Display)

Many technologies used to implement liquid crystal displays (LCDs). In the 1990s, the main application of LCD technology as a computer monitor was on laptops, where consumption, lightweight, and low liquid crystal size justified the high price.

Typically, the laptop itself presented on the screen at a high price for monochrome (active or passive), passive color, or active matrix color (TFT). With the improvement in size and production capacity, monochrome and passive color technologies removed from many product lines.

TFT-LCD is an LCD version, the main technology currently used in computer monitors. The first feature ie, sold at a high price in the mid-90s.

  • OLED (Organic Light-Emitting Diode)

Organic light-emitting diode (OLED) monitors offer higher contrast and better viewing angles than LCDs, but they require more power to display a white or clear background and pose a significant problem.


Measurements of the computer monitor

  • Size

On two-dimensional display devices, such as a screen space that controls the size of the screen or the size of an image that a computer can see.

This is the space available to display a photo, video, or workspace without interfering with other aspects of the case or block design. The main dimensions of display devices are width, height, total area, and diagonals.

  • Aspect ratio

Prior to 2003, most computer monitors had a ratio of 4: 3 to 5: 4. From 2003 to 2006, the ratio was 16: 9, and often the ratio of 16:10 (8: 5) was in the first laptops and in stand-alone monitors.

The reason for this shift was the efficient use of monitors, which included watching games and movies on widescreen computers, displaying two-page pages of word processors, as well as menus for CAD drawings and CAD applications at the same time.

In 2008, the sale of 16:10 LCD monitors was a common aspect and in the same year, 16:10 became the main standard for laptops and notebooks.


  • Resolution

The resolution of computer monitors increases over time. From 320×200 in the early 1980s to 1024×768 in the late 1990s. The best-selling resolution for computer monitors since 2009 is 1920×1080.

Until 2013, consumer LCD monitors limited to 2560×1600, with the exception of Apple products and CRT monitors, 25 cm (76 cm).

Apple introduced the 2880×1800 Retina MacBook Pro with a 15.4-inch (39 cm) on June 12, 2012, and the 5120×2880 Retina iMac went 27 inches (69 cm) on October 16, 2014. Since 2015, major manufacturers have released screens with a resolution of 3840×2160.

  • Gamut

Each RGB monitor has its own chrome-plated color triangle. Some of these triangles are smaller than the sRGB triangle, others are larger. Colors coded by 8 bits for each primary color.

The RGB value [255, 0, 0] is red but differs slightly in color spaces in the case of AdobeRGB and sRGB. The appearance of SRGB encoded data on many devices can give real results.

The range is the property of the monitor. The color space of the image sent as Exif metadata in the image. When the monitor range wider than the color space, a flat-screen appears if the monitor calibrated.

A photo that uses colors outside the SRGB color space is displayed on the sRGB color space monitor. Even today, many monitors that can display sRGB color space are not compatible with the display. Color management needed in both electronic publications (Internet browsers) and print-oriented round tables.

Additional Measurements

  • Dot pitch:-  This is the distance of sub-pixels in millimeters. In general, the dot pitch used to sharper the picture.
  • Response time:- This is the time a pixel takes to go from active to inactive and back to active again. It measured in milliseconds. Lower numbers mean faster transitions.
  • Contrast ratio:-  This is the ratio of the luminosity of the brightest color to that of the darkest color.
  • Viewing angle:-  This is the angle of maximum at which images on the monitor viewed. It measured in degrees horizontally and vertically.


Features of the computer monitor

  • Power saving

Most modern monitors switch to power saving mode if the video input signal is not received. This allows you to turn off the monitor after an error in modern operating systems. This also extends the life of the monitor. Some monitors wait even after waiting.

  • Directional screen

Some screen has a narrow viewing angle.

  • 3D (3-Directional)

New monitors can display a different image to each eye, often with the help of special glasses that give a sense of depth. The autostereoscopic screen can create 3D images without bass.

  • Touch screen

These monitors use a touch screen input method. You can select or move items with one finger, and you can use finger gestures to give commands. You may need to clean the screen frequently due to fingerprint deterioration.


Troubleshooting Computer Monitor Issues

  • Setup

Monitors can usually be used immediately by plugging in and playing. The video on the screen does not look as you think, try updating the video card driver.

  • Cleaning

New LCD monitors need to be cleaned thoroughly so they don’t look like a glass or an old CRT monitor.

  • Color problems on an older monitor

If you have an old CRT monitor that has problems seeing colors, such as multi-color vision on the edges of screens, you should disassemble it to reduce the magnetic effect.

  • Screen flickering

You can see the screen by flashing on the CRT monitor and changing the monitor refresh rate, which you can do in the Windows control panel.




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