What does CCD mean? What is this for?

CCD, English full name: charge coupled device, Chinese full name: charge coupled device. It can be called CCD image sensor.

CCD is a semiconductor device, which can convert optical images into digital signals. The tiny photosensitive substances implanted on CCD are called pixels. The more pixels a CCD contains, the higher the image resolution it provides. The function of CCD is just like film, but it converts image pixels into digital signals. There are many neatly arranged capacitors on CCD, which can sense light and convert images into digital signals. Through the control of external circuit, each small capacitor can transfer its charge to the adjacent capacitor. CCD is widely used in digital photography and astronomy, especially in high-speed photography such as optical telemetry, optical and spectral telescopes, and lucky imaging. CCD is widely used in video cameras, digital cameras and scanners, except that the camera adopts dot matrix CCD, that is, it includes X and Y directions for shooting plane images, while the scanner adopts linear CCD, and the scanning in X direction is only completed by the mechanical device of the scanner.