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A device that uses a screen to display text, numbers, symbols, graphics or charts is a complete display instrument. In the field of computer technology, it is usually used as a terminal device of a computer to display the internal data of the computer on the screen. The most commonly used display device is the cathode ray tube (CRT). In order to draw and write on the cathode ray tube screen, it is necessary to have means of drawing lines, typing and moving the position of the light spot. For example, light pens, data tablets, trackballs, joysticks, and keyboards are common input tools for dialogue between humans and computers. The picture shows the schematic diagram of the character graphics display. Display files sent from the computer, including display instructions and character codes, are input into the buffer memory via the interface. The microprocessor reads out the display files one by one and instructs the character generator and the vector generator to work together, so as to control the deflection degree of the electron beam of the cathode ray tube and the strength of the electron flow, so as to display the characters corresponding to the display file on the screen and graphics.
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