History of the CRT

Abbreviation for cathode ray tube, a is the electron beam in the monitor, it moves on the screen and strikes the fluorescent spot of the inner glass tube whether staggered or non-interlaced. The picture is an example inside the computer monitor showing the CRT connected to the screen

The CRT has three electron guns, red, green and blue. For each row of the display, each of these guns will carry a steady flow of electrons from left to right. When electrons collide with the phosphor on the CRT, the phosphor emits a certain amount of intensity. When a new line begins, the gun starts from the left and continues to the right. These guns sometimes repeat this process thousands of times until the screen is completely drawn line by line.

Once the phosphors on the CRT hit electrons, they will illuminate only briefly, so the CRT must be refreshed, which means that the process is repeated as described above. When the refresh rate of the video card is not set high enough, scrolling flickering scrolling from the top of the screen and a noticeable stabilizing line may be displayed.

The cathode ray was first discovered by Johann Hittorf in 1869, but the first CRT was invented by Ferdinand Braun was not until 1897. The first CRT named a cathode-ray tube uses a coded cathode diode with a fluorescent coated screen.

John B. Johnson and Harry Weiner Weinhart developed the first CRT using hot cathodes in 1922 and made it a commercial product.

In 1934, the first CRT TV was supplied by Telefanken in Germany. Since then, CRT technology has been improved several times and used on computer monitors and televisions. CRT monitors and televisions are widely used throughout the world until the 2000s when LCD technology became popular and replaced with CRT.

The CRT monitor is robust and suitable for use in control rooms, factory floors, or process applications. CRT represents a cathode ray tube. CRT is basically a sealed glass bottle with no air inside. It tapers outward from the narrow neck until it forms a large base. The base is the "screen" of the display and is coated with thousands of small fluorescent dots. The diagonal is a measure from an angle to the diagonal of the diagonal. Common diagonal lines include 10, 12, 14, 15, 17, 19, 21 and 23 inches. The resolution of the image is a measure of the sharpness of the image on the screen, the higher the resolution, the clearer the image. The vertical scanning frequency or refresh rate is the rate at which each pixel on the screen is redrawn. If the refresh rate is low, the image may flicker, causing eye fatigue. The standard for flickering-free images is 85 Hz. CRT monitor available in color or monochrome

Most people today tend to use displays larger than 17 inch CRT. When purchasing a 17 inch CRT monitor, there is usually an actual display area of ​​16.1 inches or more. This depends on the brand and manufacturer of the particular CRT. The difference between "monitor size" and "display area" is due to the huge framework of CRT. If you purchase a 17-inch LCD monitor, you can actually get an entire display area of ​​17 inches, or very close to 17 inches. The CRT monitor does not deny that LCD monitors are advantageous when working in a limited desk space or moving the display between computers (for some strange reason). They are not a good choice. On the other hand, the liquid crystal display device is small in size, light in structure, light in weight, and the liquid crystal display screen is thin, space-saving, easy to move. Although an average 17 "CRT monitor may exceed 40 pounds, a 17 - inch LCD monitor weighs about 15 pounds.