The purpose of opening Alipay green code mobile phone is to facilitate code scanning and improve code scanning efficiency, because some code scanning or bright places are outdoors, which will make the health code very dark under sunlight. If the brightness of the green code is too low, it will be unrecognizable by the code scanner.
In order to facilitate everyone to light up the scan code, some apps will improve the brightness when the user opens the health code, which is convenient for them to light up the scan code and facilitate others to scan the code.