Why do you see bright spots when you look at the remote control launch area with the camera lens of your mobile phone?

Because mobile phone imaging is mostly CCD components, optical images can be converted into digital signals, and infrared rays can be captured by them, so bright spots can be seen.

CCD, English full name: charge coupled device, Chinese full name: charge coupled device. It can be called CCD image sensor or image controller. 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 the same as that of film, but it converts optical signals into charge signals. There are many well-arranged photodiodes on CCD, which can sense light, convert light signals into electrical signals, and convert them into digital image signals through external sampling amplification and analog-to-digital conversion circuits. In addition, CCD is short for colony failure disorder.

Extended data:

CCD image sensor can directly convert optical signals into analog current signals, and the current signals are amplified and converted into analog signals, thus realizing image acquisition, storage, transmission, processing and reproduction. Its remarkable features are:

1, small size and light weight;

2, low power consumption, low working voltage, impact and vibration resistance, stable performance and long service life;

3. High sensitivity, low noise and large dynamic range;

4, fast response, self-scanning function, small image distortion, no afterimage;

5. It is produced by VLSI technology, with high pixel integration, accurate size and low commercial production cost. Therefore, many instruments that use optical methods to measure the outer diameter use CCD devices as photoelectric receivers.

References:

Baidu encyclopedia -—CCD