What Is an LTPO Display? 1-120Hz Refresh Rate Explained

Almost every phone spec sheet now promises a "120Hz" screen, but two phones with the same number can behave very differently. The difference is usually a single word that rarely appears in the ads: LTPO. This guide explains what LTPO is, why it matters for battery life, and how to read the rest of a phone's display specs, from nits to PWM dimming.

What is an LTPO display?

LTPO stands for low-temperature polycrystalline oxide. It describes the backplane of an OLED screen: the thin layer of tiny transistors behind the panel that switches each pixel on and off.

Most OLED phones use an LTPS (low-temperature polysilicon) backplane. LTPS transistors are fast and good at driving pixels, but they leak a little current when they are off. LTPO adds a second type of transistor made from an oxide material (usually IGZO) that barely leaks at all. The oxide transistors act like a switch controlling the LTPS transistors that drive each pixel.

That small change has a big effect. Because the pixels hold their charge between refreshes, an LTPO screen can refresh as slowly as once per second (1Hz) without the image fading or flickering. An LTPS screen has to keep refreshing much more often.

Samsung Display calls its version HOP (hybrid oxide and polycrystalline silicon), and Apple markets its LTPO screens as ProMotion. The first LTPO screen appeared on the Apple Watch, where it made the always-on display possible.

Why a 1Hz floor matters

A 120Hz screen redraws itself 120 times a second, which makes scrolling and animations look smooth. But when you are reading an article, looking at a photo or glancing at the always-on clock, nothing on screen is moving. Redrawing it 120 times a second wastes power.

An LTPO screen drops its refresh rate to match what is on screen: 120Hz while you scroll, lower while you read, and down to 1Hz for a still image or the always-on display. Apple describes the iPhone 17 doing exactly this: when not in use, the display "adjusts down to 1Hz."

Phones without LTPO can still change refresh rate, but only within a narrower range. The Google Pixel 10, for example, moves between 60Hz and 120Hz. The real advantage of LTPO is the low floor, not the fact that the refresh rate changes.

How much battery does LTPO save?

Less than marketing suggests, but enough to notice. No independent lab has published a clean, like-for-like test of LTPO against LTPS. Industry estimates put the saving at roughly 5% to 20% of display power, with most of the benefit coming when the screen is static.

In practice, LTPO is what lets a 120Hz phone match or beat the battery life of a 60Hz one, and it makes an always-on display much cheaper to run.

Refresh rate vs touch sampling rate

These two numbers are often confused:

• Refresh rate (60, 90, 120 or 144Hz) is how many times per second the screen redraws. Higher looks smoother.
• Touch sampling rate (often 240Hz or more) is how often the screen checks for your finger. Higher can make games feel more responsive.

Apple does not publish touch sampling rates, and most brands only mention them for gaming phones. Unless you play competitive mobile games, refresh rate matters far more.

Also note that "120Hz" is usually adaptive. On the Galaxy A37, for example, the standard mode stays at 60Hz, and the adaptive mode switches to 120Hz only while you interact with supported apps.

OLED vs LCD, and what the brand names mean

OLED screens light each pixel individually, so blacks are truly black and an always-on display costs little power. Almost every phone above about $300 now uses OLED. LCD screens use a backlight, have greyer blacks and appear mainly on budget phones such as the Moto G (2026).

Brand names can be misleading:

The rule of thumb: "120Hz" does not mean LTPO, and an OLED brand name does not mean 120Hz. Look for "1-120Hz", "LTPO" or "ProMotion" on the spec sheet.

How to read brightness numbers (nits)

Phone makers quote several brightness figures, and the biggest one is rarely what you see day to day:

• Typical or manual maximum: the brightness with the slider at 100%. Apple lists this as "max (typical)."
• HBM (high brightness mode): an extra boost that only switches on with auto-brightness in direct sunlight.
• HDR peak: reserved for highlights in HDR video.
• Peak or outdoor peak: usually measured on a small patch of the screen. A full white screen will be dimmer.

The Galaxy S26 Ultra shows why this matters. Samsung rates it at 2,600 nits. GSMArena measured about 1,480 nits with auto-brightness on a large part of the screen and more than 2,800 nits on a small patch, while Tom's Guide measured 1,806 nits. All three are "correct"; they just measure different things.

Minimum brightness matters too. A screen that dims to 1 nit, as current iPhones do, is far more comfortable in a dark bedroom.

PWM dimming and screen flicker

Most OLED screens dim by PWM (pulse-width modulation): they switch the pixels on and off very quickly, and the off periods get longer as you lower the brightness. Most people never notice, but some people report eye strain or headaches, especially at low brightness.

What matters is the frequency of the flicker (higher is gentler) and its depth. In measurements published in October 2026, Notebookcheck found:

• iPhone 18 Pro: 480Hz
• Pixel 10 Pro and Galaxy S26 Ultra: 240Hz
• Some Xiaomi, Honor and Oppo phones: 2,000Hz to about 4,000Hz

If you are sensitive to flicker, look for a phone with very high-frequency PWM, a setting that turns PWM off (the iPhone 17 Pro and many Motorola OLED phones offer one), or an LCD phone, since LCDs are usually flicker-free.

Resolution and sharpness

At normal viewing distance, differences above about 400 pixels per inch (ppi) are hard to see. Current iPhones are around 460 ppi, and Full HD+ Android phones are around 420 ppi. Budget phones with an HD+ (720p) screen on a 6.7-inch panel, such as the Moto G (2026), look noticeably softer when reading small text.

Anti-reflective coatings are becoming a bigger differentiator than resolution. The Galaxy S26 Ultra has one built into its glass, and the iPhone Duo uses a matte nano-texture finish on its inner screen to cut glare and hide the crease, though reviewers found it can look washed out from an angle.

Which 2026 phones have LTPO?

What to look for at each price

• Under $300: expect an LCD or a basic OLED. A 120Hz LCD is common, but check the resolution (Full HD+ is better than HD+) and brightness before the refresh rate. LCDs are usually flicker-free.
• $300 to $600: OLED and 120Hz are standard on Android, but LTPO is rare. Look for real-world brightness around 2,000 nits in sunlight and an always-on display if you want one.
• Around $800: this is where LTPO starts. The iPhone 17 has it; the Pixel 10 does not.
• $1,000 and up: LTPO is everywhere. Compare anti-glare coatings, PWM behavior and minimum brightness instead.

Frequently asked questions