Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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Apple's Massive 'Steve Jobs Patent' for the iPhone Reconfirmed in its Entirety
But as noted by FOSS Patents, the USPTO has now completed its reexamination of the patent and ruled that all twenty claims have been confirmed as patentable, significantly strengthening a patent that has been used against several of Apple's competitors in court.
As we speak, the Steve Jobs patent is even stronger than it was before someone (presumably Samsung and Google) challenged it anonymously. On September 4, 2013, the USPTO issued a reexamination certificate confirming the patentability of all 20 claims because the prior art neither anticipated this invention nor renders it obvious.A number of Apple's key patents have been challenged for reexamination as its competitors have sought to derail Apple's claims against them in various court battles. While the USPTO has issued preliminary "first office actions" invalidating those patents in some cases, Apple has been successful in arguing its case and ultimately restoring the validity of at least the most important claims of those patents. In an example from earlier this year, a key claim of Apple's "rubber banding" patent used against Samsung was confirmed after having been preliminary invalidated last year.