Sometimes when your computer screen is faint, or the screen brightness is too low even at 100%, and/or the laptop screen is too dark at full brightness, it is most likely caused by the low voltage at the LCD inverter. This component is responsible for producing your computer screen backlight.
Assuming your display isn't damaged, the most common culprit for a consistently darkened screen is power saving mode. When your battery is close to being drained, your smartphone can turn off a number of background operations and tweak the display to use less power.
2. Adjust your brightness settings
The minimum brightness level on an iPhone might not be low enough for some users, but there are two ways to lower the brightness below the minimum. This might come as a surprise to some, but iPhone users can actually lower the screen brightness below the minimum level.
100 lumens is considered bright enough for most walkways — including commercial properties. 100 lumens is equivalent to about 20 watts.
So, while brightness itself is not a concern for eye health (unless you're staring directly at the sun!) having your brightness set to a level that is more comfortable for your eyes, can also reduce the amount of blue light, which will protect your eyes from phototoxicity.
“There's no benefit in having it any brighter than it has to be.” You can even invert the colors on your screen so that white backgrounds become black, and black text becomes white.
It's normal for your iPhone screen to automatically dim and change the brightness levels depending on ambient lighting. Most smartphones, including your iPhone, have an ambient light sensor that powers the auto-brightness feature.
If your device gets too warm Charging, including wireless charging, slows or stops. The display dims or goes black. Cellular radios enter a low-power state. The signal might weaken during this time.
From the System Preferences panel, click on “Battery” located in the bottom row. Here, head over to the Battery section from the left pane. Now, you'll find a setting called “Slightly dim the display while on battery power”.
iPhone adjusts the screen brightness for current light conditions using the built-in ambient light sensor. Go to Settings > Accessibility. Tap Display & Text Size, then turn on Auto-Brightness.
Open Settings and tap Display & Brightness. Drag the slider under Brightness to the right to increase the brightness of your iPhone.
How To Fix Auto-Brightness Issue on iPhone 11/XS/XS Max /XR. Go to Settings > Zoom (or General > Accessibility > Zoom) > Zoom Filter and checkmark None as your Zoom filter option–do not use the Low Light setting!
The iPhone 12 dimmed screen could be caused by an Accessibility setting that's role is to reduce the intensity of bright colors, to help users with visual impairments. Open Settings. Scroll for Accessibility. Tap on Display & Text Size, in the Vision section.