The image capturing condition:
- dark room
- mobile phone with maximun screen brightness is in the center of the image
- there is a reddish band in horizontal direction
Does anyone know why the phenomenon appears?
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That is a readout issue that can occur with CMOS sensors.
It is essentially the same thing as CCD "smear;" only in a horizontal direction rather than vertical, and CCD sensors are much more prone to it due to the difference in readout technologies.
It will only occur with a very high contrast source against a very dark BG, and usually only visible with exposure recover/pushing.
This is caused by saturation of the sensor. If the pixel well is overloaded, electrons leak in to neighboring pixels which causes the streak. A nice article that has a more in depth explanation.