What does CCD size mean?

CCD size refers to the size of charge coupled devices.

CCD image sensor can directly convert optical signal into analog current signal, and the current signal is amplified and converted into analog-digital signal, thus realizing image acquisition, storage, transmission, processing and reproduction. Usually the larger the size, the better the effect.

CCD is widely used in digital photography and astronomy, especially in optical telemetry, optical and spectral telescopes and high-speed photography, such as lucky imaging. CCD is widely used in cameras, digital cameras and scanners, except that the camera uses dot-matrix CCD, that is, it includes X and Y directions to capture plane images, while the scanner uses linear CCD, and the scanning in X direction is only completed by the mechanical device of the scanner.

The larger the size of the extended data sensor, the larger the photosensitive area and the better the imaging effect. 11.8-inch 3-megapixel camera is usually better than 1/2.7-inch 4-megapixel camera (the light-sensitive area of the latter is only 55% of the former). It is good to increase the number of sensor pixels with the same size, but it will also lead to a decrease in the photosensitive area of a single pixel, which may lead to underexposure.

Digital cameras with larger sensors are also expensive. The size of the photosensitive device directly affects the volume and weight of the digital camera. Ultra-thin and ultra-light digital cameras generally have smaller sensor sizes, and the more professional digital cameras have larger sensor sizes.

Baidu Encyclopedia -CCD (Charge Coupled Device)

Baidu encyclopedia-sensor size