Super bright phone screens: hidden pitfalls we should know about

Disclaimer time! Yeah, I know, it's not that hard to simply turn around away from the direct sunlight and enjoy your TikTok content by throwing shadow over your phone. Or simply put your palm next to your phone to shelter it from the dreaded sunlight.

I'm sure we can also live pretty comfortably without 5G speeds – heck, even without the internet – but that toothpaste has left the tube long ago and we can't turn the tide of time in reverse. That doesn't mean we should put up with each and every thing that is handed to us, but with smartphones, it's best to adapt and make some lemonade.

When discussing phone screen brightness, nits (cd/m²) are the standard unit of measurement. Higher nits indicating a brighter display, simply put.

There's also a thing called "peak brightness" that refers to the maximum brightness a screen can reach under specific conditions, like HDR content or bright sunlight, while sustained brightness is the level a screen can maintain over time without dimming or overheating. Peak brightness is achieved for a limited amount of time and for a limited area on the screen.

It's not just flagships that are bright

Once you go bright, you never go dark: until recently, super bright screens were a territory, reserved for flagships. Those of us who sported non-expensive phones had to squirm and squint at times, just to see what's happening on the screen. That scenario was playing out when in direct sunlight.

Luckily, it's not just high-end handsets that are getting bright screens these days. The Pixel 9a that is on the horizon might come with a very bright display: it may not be the cheapest phone out there (if the rumors about its $499 price turn out to be true), but numerous flagships go through the $1,000 threshold like a hot knife through butter. So, the Pixel 9a is justified to be called a mid-ranger.

Pros and cons: can't have your cake and eat it, too

If you happen to have been outside lately, you'll know the sun is shining (and the weather is sweet, as the gentleman from Jamaica used to sing) – and it's shining real hard, March or not.

That's precisely why you need a super bright display on your phone.

With high brightness levels, it's easier to read in direct sunlight, improving visibility and reducing glare. This makes tasks like checking emails, navigating maps, or viewing photos much more convenient. Additionally, the increased brightness enhances HDR (High Dynamic Range) content, providing more vivid colors and improved contrast for a better viewing (or gaming) experience.

Now, for the "lemons" part: a higher brightness is not produced out of thin air; your car doesn't typically go faster without extra fuel, right? As a result, a higher battery consumption is what we're dealing with. Thankfully, display panels (as chipsets) are getting more and more efficient, but lighting up the screen at maximum brightness is certainly not without battery drain to some degree.

What's more, prolonged brightness levels consume more power, which can reduce the device's overall battery life, especially when used at maximum brightness for extended periods. This can lead to more frequent charging, which can be inconvenient for users on the go.

So, having a real bright display is great, but only if it gets remarkably dark as well, I must admit. Xiaomi says the default dimming method for the Xiaomi 15 Ultra screen is DC dimming (which adjusts power directly) when in high brightness; and high-frequency PWM (1920Hz) dimming in low brightness. The PWM dimming rapidly turns the screen on and off to keep colors accurate and the display sharp, though it may cause eye strain for some users.

Another downside is the potential for overheating. Running a screen at high brightness for long periods can generate excess heat, potentially affecting the device's performance and comfort.

And – this one you're sadly familiar with, I'm sure – exposure to very bright screens, especially in dark environments, can cause eye strain and discomfort.

"If ye ask me…"

In Woody Allen's To Rome with Love (2012), there's a great line that says – and I'm paraphrasing here – that life is cruel, it doesn't give satisfaction neither to the rich and famous, nor to the poor and unknown. "But, between the two, being rich and famous is definitely better", the line ends.

That's why I find it really useful that my phone has a very bright screen. Do I keep it at 100% all the time? No, not at all. I find myself bumping my phone's display to 100% brightness once or twice a month, probably. Then I dial it down and it's alright. But it's better to have a feature and not use it often than to miss it when you really need it.