Main categories of CRT monitors

1. Classification according to control methods:
(1) Analog adjustment: Analog adjustment is to set a row of adjustment buttons outside the monitor to manually adjust some technical parameters such as brightness and contrast. Because there are many analog components, the probability of failure is greater, and there are very few adjustable contents, so it has disappeared.
(2) Digital adjustment: Digital adjustment adds a special microprocessor inside the display, which makes the operation more precise and can memorize the display mode. It also uses mostly micro-touch buttons, which has a long life and a low failure rate.
(3) OSD adjustment: Strictly speaking, OSD adjustment is a type of numerical control method, which can intuitively reflect the adjustment on the screen in a quantitative way.
2. Classification by type of picture tube:
(1) Spherical picture tube: The defects of the spherical picture tube are very obvious. It is curved in both horizontal and vertical directions, and the corner distortion is serious. As the viewing angle changes, the image will tilt, and it will easily cause light reflection, which will Lowering the contrast is more irritating to the human eye.
(2) Cylindrical picture tube: The cylindrical picture tube adopts a grid-type shadow mask, which does not have any bend in the vertical direction and has a slight curvature in the horizontal direction. Common cylindrical tubes can be divided into single-gun and three-bundle tubes and three-gun and three-bundle tubes.
(3) Flat picture tube: Flat picture tube is the development direction of CRT color display. Flat picture tube realizes a true plane in both horizontal and vertical directions. Distortion and reflection are reduced to the minimum, which makes the focus range during viewing increase.