Auto-Brightness is a component intended to spare battery life and make your iPhone’s screen less demanding to peruse. When you’re some place dull, similar to your room around evening time, the screen will consequently diminish. When you’re some place splendid, as outside on a radiant day, it’ll wrench itself up to most extreme splendor.
Auto-splendor is by and large really great at adjusting to evolving conditions, and since the screen is one of the greatest battery drainers on your telephone, we’d for the most part suggest abandoning it on. Be that as it may, in case you’re somebody who wants to control it physically, or discovers it reliably comes up short with regards to the brilliance you’re searching for, here’s the manner by which to turn it off.
Head to Settings > General > Accessibility > Display Accommodations.
Toggle the Auto-Brightness switch to off.
Presently the screen Brightness will stay consistent regardless of the light level of your area. On the off chance that you need to change the Brightness, swipe up from the base of your screen to get to the Control Center (which just got a major refresh in iOS 11) and modify the splendor slider. Simply be mindful so as not to daze yourself with a truly splendid screen during the evening!