CRT display
It is a display using a cathode ray tube, and the cathode ray tube has five parts: Electron Gun, deflection coil, shadow mask, phosphor (Phosphor) And glass housing. It is one of the most widely used displays, and the CRT flat display has a visual angle, no bad point, high color reduction degree, multi-resolution mode of color, and adjustable multi-resolution mode, the response time is extremely short, etc. More than the advantage, and the current CRT display is much cheaper than the LCD display. CRT works: CRT (cathode ray tube) The core component of the display is a CRT image tube. The working principle is basically the same, as the image tube of the TV set in our family, we can think it is a more fine TV set. The classic CRT developing tube uses the electron gun to transmit high-speed electrons, and control the deflection angle of high-speed electrons via vertical and horizontal deflection coil. At the end, the phosphorescent substance on the high-speed electronic hit screen makes it emits, and the power of the electron beam is adjusted by the voltage. Form a variety of patterns and text on the screen to form a different spot. Each pixel point on the color developing tube screen is combined by red, green, and blue, and the three colors of phosphorescent coatings are activated by three electron beams, and the brightness of three colors is adjusted with different intensity electron beams. The degree can get the desired color, which is very similar to the coloring process of painting. If the electron beam is aimed at not accurate enough, it is possible to hit the adjacent phosphorescent coating, which generates incorrect color or slight objection, so it must be more accurately controlled for electron beams. The most classic solution is to install a shadow mask in front of the image tube. This shadow mask is only a metal sheet of a small hole (generally using a very low thermal expansion). ), Only the correctly targeted electron beam can pass through the shielded holes corresponding to each phosphorescent spot, the shadow mask will stop any scattered electron beam to avoid the wrong phosphorescent coating, this is a shadow mask Diagram tube. Relatively, some companies have developed shaded ballast imaging tubes, which are not distributed in the past, but in a vertical line, and in front of the phosphorescent coating, a considerable metal wire is used to replace it. The shadow mask, the metal wire is used to block the scattered electron beam, the principle is the same as the shadow mask, which is the so-called shaded gate image tube. Both techniques of this shadow mask and shadow have their own advantages and disadvantages. In general, the image and text of the shadow mask are sharp, but the brightness is relatively low; the shaded gate imaging tube is more bright, but on the screen 1 / 3 and 2/3 have a horizontal damping line shadow (the damping line is used to reduce a horizontal metal wire of the gate shadow masquerade). The mainstream flat CRT display is now using the image tube mainly including LG "Future Windows", Samsung "Dana Tube", Sony "Special", Mitsubishi "Diamond", Taiwan "China Management" and Hitachi "sharp ", Etc. The pure flat imaging tubes of each manufacturer have their own uniqueness, and there is also a characteristic in performance.
