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What is Color CRT Display?

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The color CRT display is a device used for presenting information to a user. The CRT produces images by projecting an electron beam onto the screen and using the phosphor colors to produce colors or light.

A color television display often referred to as a TV or simply as “the telly” is an electrical appliance that emits images in order to present content, predominantly as part of consumer media rather than professional equipment. Although color televisions were used for the first time in Europe in 1928 and in North America in 1929, the first commercially successful television which could be purchased by a consumer was not available until 1939.

The use of electronic devices for displaying information has become less common with the advance of computers and other digital media, but televisions are still very popular.

CRT stands for “cathode ray tube”. The CRT is a display device that uses a focused beam of electrons to produce images. The images can be transferred into various other output devices, like video projectors or computer monitors (see also: Digital television ). The display is built of colored phosphor dots or diodes; each dot is called a “picture element”, or “pel” for short.

History:

First attempts at creating successful color television display date back to the beginning of the 20th century. In 1929, Westinghouse Electric Corporation demonstrated a color television display that was based on a rotating disk with three colored filter elements (red, green, and blue). However, this system had too low a resolution for practical use at that time. Other attempts to create color television displays were made throughout the 1930s but none of them became commercially successful due to various physical defects in the devices.

During the 1950s and 1960s, some television sets used multi-colored CRTs to produce colorful images, but the display device was not easy to operate and of low quality, especially compared to regular black-and-white TV sets. As a result, color television set sales did not reach a large scale until the early 1960s.

In 1968 Sony Corporation of Japan demonstrated a prototype for a color television set using a new type of color CRT called an “e-CRT”, which later became known as an “EDS” (electronically scanned display) because it uses an electron gun instead of phosphor dots as in other displays.

Working:

“EDS” CRTs emit an electron beam and the electron leaves the cathode of the CRT at a certain angle. When the beam hits a phosphor dot, the signal shifts to another color. With several layers of phosphors, one can produce multiple colors. The brightness of each color is controlled by a color wheel (sometimes called “color wheel”). The image produced in such a TV display needs to be converted into a digital format before it can be displayed on computers or mobile devices. This is done by special marking patterns on or near the screen: what are known as “luma” and “chroma”.

Luma is used to represent the brightness information in an image, while chroma represents the color information. The luma pattern on a CRT display consists of two vertical stripes, one dark and one bright. It is usually placed where the center of the picture is located; for example, between two vertical stripes indicating fine horizontal lines of a black-and-white image. As such, it can be scanned by a TV tuner card’s (TV tuner) analog-to-digital converter with minimal loss of resolution.

Color CRT Display

 

Advantages: 

The color CRT display has several advantages over other types of displays:

  • Color CRT displays can produce very good images. The image quality of a good color CRT TV or computer monitor is still considered to be better than the quality provided by any other type of display, although advances in digital technology are beginning to make this statement less true.
  • Color CRT displays are usually able to present images at high resolutions and can produce clear images with both analog and digital content (although they do not produce as sharp an image as a computer monitor).
  • Color CRT displays can support several different image sizes (e.g. 4×3, 16×9, etc).

Conclusion: 

While the overall image quality of color CRT displays is still considered to be better than other types of displays, especially for computer monitors, images colored in with digital content tend to be sharper and clearer. The recent introduction of high-definition television (HDTV) has led to sharper images, but poor color saturation. The greater cost usually associated with a color CRT or computer monitor is usually justified by the higher quality images and better resolution (especially for computer monitors).


Last Updated : 24 Aug, 2022
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