Climate change may be the best reason for green lines.
A decade ago, lines on screen wasn't so prevalent, and if it were, it was largely deemed as user fault or just unlucky. Nowadays, we are seeing more daily occurance and news articles about green lines, but it was largely accepted as a combination of heat and software updates causing phones to heat up.
But this theory doesn't make sense, a decade ago, phones were heating up during software updates, but the issues with screens didn't appear widespread until around 2020, with the galaxy note 9 green screen which I hear people were also blaming on the updates which caused the phone to heat up? And back then issues with lines on the screen wasn't a huge issue that news articles are covering.
But, very few, had mentioned something about climate change? According to the Samsung website, the best optimal temperature to operate our phones are in 0-35C. Some countries ambient temperatures already exceeded the recommended temperature due to climate change causing extreme temperatures in the upside and the downside.
Our phones love stability, but however, with recent events our global temperatures have been steadily increasing, with drastic weather. Some days, it may be very hot and very cold. The stability that our phones once had is no longer possible. Our phones are going through daily hardships, with it heating up whilst you're gaming, texting or using social media. This is the type of passive heat that destroys your screens and battery like what news articles mention about green lines being caused by software updates.
At the end of the day, technology works best at certain temperatures, but these temperatures that manufacturers guarantee works best on, is shrinking, if not impossible to achieve in certain countries. Manufacturers like Samsung needs to up it's game on heat. They should make sure that their technology can last during extreme heat waves.