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Differences between a Raster Scan and a Random Scan Display

Differences between a Raster Scan and a Random Scan Display

A display is an output device that presents textual, graphical, and video information. There are two main types of displays: raster scan displays and random scan displays. In this blog post, we will discuss the differences between these two types of displays. We will also provide some tips on how to choose the right type of display for your needs.

What is a Raster Scan Display?

Raster Scan Display is a scanning technique used to create images on a television or computer screen. The scanning process begins at the top left corner of the screen and proceeds in a horizontal line across the screen.

  • Once the scan reaches the right side of the screen, it moves down to the next horizontal line and starts again at the left side. This process is repeated until the entire screen has been scanned.
  • Raster Scan Displays are commonly used in cathode ray tube (CRT) monitors and televisions. They are also used in some types of liquid crystal displays (LCDs). Raster Scan Displays have several advantages over other types of displays.
  • They can produce sharp images with a wide range of colors, and they can be refreshed quickly to show rapid changes in an image. Raster Scan Displays are also relatively inexpensive to produce. However, they do have some disadvantages. Raster Scan Displays can flicker if the refresh rate is too low, and they can be difficult to view from certain angles.

What is a Random Scan Display?

Random scan display is a type of computer graphics display device in which each pixel on the screen is itself a small CRT. It scans rapidly through the entire screen in a non-uniform pattern, stopping at Random locations to draw or not draw a picture element Interlaced scanning can be used to double the effective refresh rate.

  • Random scan displays were once commonly used in computer graphics workstations because they were well suited for interactive 3D graphics applications. However, they have largely been replaced by continuous-scan displays such as LCDs and plasma displays.
  • Nevertheless, random scan monitors are still used in some applications where their advantages outweigh their disadvantages. For example, some medical images such as ultrasound and MRI scans are best displayed on a random scan monitor because the subject is constantly moving and the display must be refreshed quickly.
  • Random scan monitors are also well suited for industrial applications such as process control, where data is constantly changing and precise timing is critical. Even though Random scan monitors are not used as much as they once were, they continue to find new applications in areas where their unique capabilities are needed.

Differences between a Raster Scan and a Random Scan Display

  • Raster Scan and Random Scan are two methods used to display images on a screen. Raster Scan is the most common method used, where an electron beam is scanning the screen horizontally in lines from top to bottom. Each line is drawn one after another until the entire image is displayed.
  • Meanwhile, Random Scan only draws the image when there is a change in pixels. This means that when an object is not moving, there would be no need to draw it repeatedly like in Raster Scan.
  • The trade-off for this is that when an object starts moving, there would be a visible “trail” behind it due to the delayed drawing. In conclusion, Raster Scan is more suited for displaying still images while Random Scan is better for moving images. However, both have their own advantages and disadvantages that should be taken into consideration before making a decision.


Differences between a Raster Scan and a Random Scan Display. In order to choose the best monitor for your needs, it is important to understand the two different types of scanning displays: raster scan and random scan. A raster scan display refreshes all pixels on the screen in a sequential order, left-to-right then top-to-bottom. This type of scanning is used by traditional monitors, televisions, and projectors. A random scan display refreshes individual pixels as they are needed, which can result in faster response times but also more visible artifacts or glitches. This type of scanning is used by some gaming monitors and high-end professional displays.

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