LG was one of the first to add the feature back around 2013. Now it's more commonly known as dt2w (double-tap to wake) and is a feature on a lot of stock roms,

LG was one of the first to add the feature back around 2013. Now it's more commonly known as dt2w (double-tap to wake) and is a feature on a lot of stock roms, as well as pretty much any custom rom.