Why is my iPhone screen dark on full brightness in the sun?

If you have it mounted in a spot where it's in direct sunlight through the windshield, it may be reducing brightness to try and control heat.

Mount it where the sun doesn't shine on it or place it right in front of an air conditioning vent to keep it cool.

Lawrence Finch wrote:

By any chance, are you wearing polarizing sunglasses?

Good suggestion!

That’s interesting, my polarized sunglasses make my screen almost black. If i tilt my head I see more of the screen, but never as little as just 10%.

I encounter similar issues in the bright sunlight where I live (Florida Gulf Coast) and it’s just the way they work. In the heat the screen dims and my pupils to constrict. In bright light I can’t see the screen well until I get into the shade.

In my experience running my iPhone at full brightness, running the GPS, using iTunes (or Spotify) to download music, run the cellular radio (for streaming music) and having my iPhone plugged into a fast charger definitely cause heat to build up. Things are necessarily disabled to reduce battery life, especially if plugged in and charging. It sounds like heat is the issue.

What is running in the background? Look at your last 24 hour and 10 days battery usage by App and see who the culprits are. Once identified, delete the app(s) and download another copy. Many of the Meta and Google apps are well known culprits.

There are several avenues to report your issues to Apple. One way is to use the feedback link I shared below. You can also call Apple Support or use the chat feature in areas where available. Use the links below to report your issues.

Product Feedback - Apple

Official Apple Support

Slep3000 wrote:

the screen is dark when I'm driving at 2pm, even though it's set to maximum brightness, I mean, this happens a few minutes after I start driving, I saw exactly the moment when the screen darkened to half the brightness, I looked at the toolbar and it was at maximum. The moment when I need clarity the most is when I'm in the strong sun, and the screen simply reduces its brightness by half, this puts me at risk of an accident, since I'm having great difficulty seeing the screen while driving...🛑🛑🛑

iphone 15 pro max all updates made

By any chance, are you wearing polarizing sunglasses?

Jeff Donald wrote:

That’s interesting, my polarized sunglasses make my screen almost black. If i tilt my head I see more of the screen, but never as little as just 10%.

Screens are polarized, so if the polarization of the screen and sunglasses are at right angles the screen will be black.

If your iPhone is at low battery or exposed to sunlight, it can automatically lower its brightness. This is to preserve battery charge, prevent overheating, and help battery longevity.

Remember, you shouldn't be looking at your iPhone when driving. That is what causes most accidents.

Slep3000 wrote:

😂😂😂 you are so funny. When you drive more than 30 thousand miles a year, you definitely need to use a gps map, maybe you just drive from home to the nearest Walmart, I've been driving since 2006 so you know. I would like to expose this problem to Apple support, but you know what, you CANNOT, there is no channel where you can report a problem to them, because if this happened and it was beneficial they would have to pay something to the reporter, so they provide this open chat and anonymously collect reported problems. another thing here is the report. If your phone is heating up just because you are using a GPS app and listening to music, something is wrong, because running this and the screen at maximum brightness together with the battery charging are NOT enough to heat up to the point that certain services are reduced in order to save battery life... I mean, systems are running on your cell phone improperly, maybe Apple is mining digital data on your phone? 🤷🏻‍♂️ Just today, I turned off my phone when I noticed a rapid battery drain and heating for no reason... there is something wrong happening in our expensive devices...

Wow, amazing. I’ve been driving since 1960, and I somehow managed to get where I wanted to go long before GPS was even a gleam in the eye of the US military, who created it.

The rest of your post is nonsense in many ways.

But to focus on one:

Apple’s formal support can be reached several ways

• You can provide feedback to Apple at→ Product Feedback - Apple where your issue or suggestion will be recorded, tracked and matched with similar reports, but you will not get a reply

For personalized support

Best way: 

• Install the Apple Support app on your iPhone or iPad - you can contact support directly from the app, and the tech will have (with your permission) access to diagnostic data on your device

Other options:

• • Click on “Support” at the top or bottom of this page
  • Go to Contact Official Apple Support

(Note that both of the above have options to receive a callback or chat)

• • Call Apple Support; the phone numbers are in this link→Contact Apple for support and service - Apple Support
  • Make a Genius Bar appointment at an Apple Store→Genius Bar Reservation and Apple Support Options - Apple
  • Find an Apple store or Apple partner service provider→Find Locations

Slep3000 wrote:

teach me how to drive without looking at the map on my cell phone

I think we certainly could if we were in physical proximity. After all, it's how most of us over a certain age learned to drive. ;-)

Turn the volume up on the voice prompts.

Slep3000 wrote:

😂😂😂 you are so funny. When you drive more than 30 thousand miles a year, you definitely need to use a gps map, maybe you just drive from home to the nearest Walmart, I've been driving since 2006 so you know.

Oh, so you're a youngster! I've been driving since 1977 (approximately). I've drven many thousands of miles across two countries with no GPS. My mother started driving in about 1936. She used to drive across the country. With three kids and a dog. And no GPS.

Don't get me wrong. I love GPS. But phones get lost, broken or stolen. You really out to consider learning some basic map skills.

Lawrence Finch wrote:

Wow, amazing. I’ve been driving since 1960, and I somehow managed to get where I wanted to go long before GPS was even a gleam in the eye of the US military, who created it.

Or when accuracy was still restricted. Kids today....

Yes, I’m aware how cross polarization works, 😀 but I’ve never seen good polarized sunglasses just darken the screen 10%, especially if the angle of view is askew.