Refresh Rates and OLED vs LCD: Display Tech Explained Simply

Screens are the part of a device you look at all day, yet the terms used to describe them can be confusing. Spec sheets mention 60Hz and 120Hz, OLED and LCD, and a handful of variations on each. Two ideas cover most of what matters: how often the screen updates, and how it actually produces light and colour.

What refresh rate actually means

A screen's refresh rate is how many times per second it redraws the image, measured in hertz (Hz). A 60Hz display updates 60 times a second; a 120Hz display updates twice as often. Each update is a chance to show movement, so a higher rate makes motion look smoother — scrolling text stays easier to read, and swipes and animations feel closer to your finger.

• 60Hz — the long-standing baseline, perfectly usable for reading and video
• 90Hz to 120Hz — now common on phones, tablets and laptops, with a clear improvement in smoothness
• 144Hz and above — mostly aimed at gaming monitors, where fast motion and quick reactions matter

Refresh rate vs frame rate

The screen can only show as many new frames as the device sends it. A game running at 50 frames per second won't look like 120 just because the screen supports it. Likewise, films are usually made at fixed rates well below 60, so a faster screen doesn't make them look different. Many devices now use adaptive or variable refresh rates, adjusting on the fly to match what's on screen and saving battery when nothing is moving.

LCD: a backlight behind a filter

An LCD screen has a light source behind it that's always on while the screen is in use. In front of that sits a layer of liquid crystals that twist to let more or less light through, plus colour filters for red, green and blue. Because the backlight is always shining, blacks tend to look dark grey rather than truly black, especially in a dim room.

Mini-LED screens are a refinement of this: the backlight is split into many small zones that can dim independently, improving contrast. They're still LCDs, though.

OLED: every pixel makes its own light

In an OLED screen, each pixel emits its own light and can switch off completely. That's the main reason OLED displays are known for deep blacks, high contrast and vivid colour. Panels can also be thinner and, in some designs, flexible — which is why folding phones use them.

The trade-offs

• OLED strengths — true blacks, excellent contrast, wide viewing angles, quick pixel response
• OLED weaknesses — higher cost, and a risk of burn-in from static images over long periods
• LCD strengths — lower cost, no burn-in, and very bright options available
• LCD weaknesses — greyer blacks and less dramatic contrast, particularly in the dark

Which should you choose?

For a phone, an OLED screen with a 120Hz refresh rate is now common even outside top-end models, and it's a combination worth having. For a TV, OLED suits dark rooms and film watching, while a good Mini-LED set may be the better pick for a bright living room or lots of static content like news tickers. For a computer monitor, think about use: smooth high-refresh panels for gaming, and consider how much fixed on-screen furniture you'll have before choosing OLED.

Once you know that refresh rate is about smoothness and panel type is about how light is made, most display specs become much easier to read — and much easier to compare.

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