Is 1ms Response Time Real?
Almost never in the way the marketing implies. A "1ms" spec-sheet number is nearly always MPRT (Moving Picture Response Time), achieved mostly through backlight strobing — not GtG (gray-to-gray), the actual pixel transition time. The two measurements use different methods and are not comparable; a monitor's true GtG time is often several times its advertised MPRT number.
GtG vs MPRT — the two different numbers
GtG (gray-to-gray) measures how long a single pixel takes to transition between two specific gray shades — this is the closest LCD analogue to a "true" response time, though manufacturer GtG numbers are typically best-case transitions, not an average across all possible transitions.
MPRT (Moving Picture Response Time) measures how long a moving object appears blurred to the human eye. It is reduced primarily by backlight strobing — rapidly flashing the backlight off between frames so the eye can't track a still-illuminated stale frame during motion — rather than by making the pixel itself switch faster. A panel can advertise "1ms MPRT" while its actual GtG time is 4-5ms or more.
Why this matters when comparing monitors
A spec sheet that says "1ms" without specifying MPRT or GtG is not giving you a comparable number against a competitor's spec sheet that also says "1ms" — one could be genuine GtG, the other strobed MPRT. Always look for the explicit label, or check independent third-party measurement sources that test both consistently.
The strobing tradeoff
Backlight-strobing modes (branded things like ULMB, ELMB, DyAc) that achieve low MPRT numbers typically reduce overall screen brightness, since the backlight is switched off part of every refresh cycle, and can introduce visible flicker for sensitive users. Many monitors also cannot run strobing and variable refresh rate (FreeSync/G-Sync) at the same time — check a specific model's support for running both simultaneously rather than assuming it.
Where OLED changes the picture
OLED panels (WOLED and QD-OLED) are emissive — each pixel produces its own light and switches near-instantly — so genuine sub-1ms GtG response is achievable without any strobing trick. This is one of the real, measurable advantages OLED holds over LCD panel technology for fast motion.
Full normalized table: The Monitor Numbers.
Frequently Asked Questions
Usually not in the way it's implied. Most '1ms' specs on gaming monitor boxes are MPRT (Moving Picture Response Time), achieved mainly through backlight strobing, not a genuinely 1-millisecond pixel transition. The actual pixel transition time (GtG) is often several times slower on the same panel.
GtG (gray-to-gray) measures how long a pixel takes to change from one gray shade to another — the closest thing to a 'real' response-time number. MPRT measures how long a moving object appears blurred to the eye, which strobing lighting tricks can reduce even without a faster pixel underneath. The two numbers use completely different methodologies and are not directly comparable.
MPRT numbers are typically lower and more marketable (1ms MPRT looks better than a true 4-5ms GtG figure), and backlight-strobing modes genuinely do reduce visible motion blur for the viewer even though the underlying pixel isn't switching faster. It's not necessarily deceptive engineering — but a spec sheet that doesn't label which measurement it's using is not giving you a comparable number.
Yes. Backlight strobing modes typically reduce overall brightness (the backlight is literally switched off part of the time) and can introduce visible flicker for sensitive users. Many monitors also can't run strobing and variable refresh rate (FreeSync/G-Sync) simultaneously — check whether a specific model supports both at once before assuming you get low MPRT and adaptive sync together.
Less so. OLED panels are emissive and each pixel switches near-instantly, so genuine sub-1ms GtG numbers are achievable without any strobing trick — a meaningful difference from LCD panels claiming 1ms only via MPRT.