Dark trailing / smearing
A dull band lagging behind the moving edge means pixels are still mid-transition when the next frame arrives. Most visible on dark-to-light wipes and VA panels' black smearing.
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Display Response Time Test
DISPLAY DIAGNOSTICVISUAL RESPONSE TESTInspect how your display renders fast color transitions — a high-contrast edge sweeping across the screen — and watch it closely for trailing, smearing and overdrive halos.
PatternsGTG TransitionsChecksTrailing · OvershootOutputMotion Clarity
RUNS LOCALLY
READYNotice: Reduced motion is enabled in your OS preferences. Disable it if you want to perform the full motion response test.
TEST PAUSED — PAGE NOT VISIBLE. Click Resume to continue testing.
Transition Wipe Viewport
Pattern Color TransitionTransition Black → WhiteSpeed 960 px/sMode STANDARD
Response Test · Ready
When started, a hard edge will sweep across the field. Stare at the boundary and note what forms behind it: a dark trail means slow transitions, a bright halo means overdrive overshoot.
Best inspected fullscreen. Space start / pause · F fullscreen · R restart Test Complete
Review what you saw while the edge moved, then log it in the observation panel — your eyes are the measurement here.
PatternBlack → White
Application Transition250 ms
Motion Speed960 px/s
Duration30s
Average FPS--
Frame Stability--
Your RatingGood
Your ObservationNo visible trailing
This is a visual browser-based test. The application transition duration is not a measurement of the monitor's physical GTG or MPRT response time.
Test Mode
Test Transition Speed — browser-generated duration, not physical GTG
ms
Transition Direction
Motion Speed (for Moving Object) — 960 px/s
Cycle through 11 controlled grayscale levels (0% to 100%) to observe luminance transition uniformity and dark-level response. Auto mode advances every 1.5 s.
Current stepBlack → White
Eight curated patterns run back-to-back, advancing every 3.5 s — hands-free tour of high-contrast, luminance, color-channel and motion transitions.
How to Test Your Display's Response Time
- 1Set overdrive to Off / Normal first. Run the test once, then repeat at each overdrive tier — a controlled single-variable change is the only way to attribute differences to the setting.
- 2Go fullscreen and start a Black → White wipe. Fix your eyes on the moving edge — everything hiding in a window border disappears at full sweep velocity.
- 3Watch the trailing edge, not the field. Note what forms behind the sweep: a dark smear, a glowing band, or a crisp boundary that leaves nothing behind.
- 4Compare tiers side by side. Re-run the same pattern per overdrive level and compare trails; the best tier is the fastest edge without a bright overshoot halo.
- 5Probe the hard cases. Cycle the grayscale ladder and Black → Red / Green / Blue wipes — dark-to-light transitions expose slow panels (especially VA black smearing).
- 6Log what you saw. Pick an observation, rating and notes — they save locally with the session record so each run stays comparable.
What to Look For
A web browser cannot read your panel's GtG specs — it has no optical sensor and no access to the display controller. Everything here is judged by eye, and your findings only become meaningful when combined with vendor response-time specs and professional lab measurements.
Bright halo / inverse ghosting
A glowing or inverted-colored streak is overshoot: overdrive voltage pushed pixels past their target luminance. Back the preset off one tier and re-test.
Crisp edge, clean field
The boundary stays razor-sharp and leaves nothing behind it. Note which overdrive tier and speed produced it — that pairing is your usable operating point.
What the FPS readings mean
The telemetry charts report browser rendering timing only. If FPS dips below your refresh rate, frames were dropped during the wipe and the trial is inconclusive — close other tabs and re-run.
Display Response Time Test Guide
Learn what display response time means, how GTG and MPRT differ, why pixel transitions produce trailing, and how to visually inspect your monitor using controlled browser-based tests.
01 · What Is Display Response Time?
Display response time describes the physical duration required for pixels to change from one color or brightness state to another. Faster transitions prevent image trailing.
02 · What Is GTG?
Gray-to-Gray (GTG) measures the transition speed between mid-tone luminance values. Manufacturers often claim 1ms based on a single cherry-picked best transition.
03 · What Is MPRT?
Moving Picture Response Time (MPRT) measures the perceived duration a pixel is visible to the human eye during continuous movement across sample-and-hold frames.
04 · GTG vs MPRT
GTG reflects the physical state transition speed of the display panel. MPRT reflects the optical persistence of the image on your retina, which depends heavily on refresh rate.
05 · Why Pixel Response Matters
In fast-paced gaming, slow pixel response creates smearing and motion blur that degrades target tracking, visual sharpness, and competitive clarity.
06 · What Causes Visible Trailing?
Trailing occurs when pixel liquid crystal molecules cannot complete their transition before the next frame is presented, leaving an illuminated artifact behind moving objects.
07 · How Overdrive Affects Response
Overdrive accelerates pixel state changes by applying higher voltage spikes. Moderate overdrive improves motion clarity, while extreme overdrive causes severe inverse ghosting (overshoot).
08 · How Refresh Rate Relates to Response
Higher refresh rates decrease frame persistence (MPRT), making motion appear clearer. However, if pixel GTG response is slower than the refresh cycle (e.g. >6.9ms at 144Hz), trailing will persist.
09 · How to Test Display Response Time
Run directional color wipes and sweeping high-contrast shapes. Observe the leading and trailing edges in fullscreen mode to see if trailing or overshoot artifacts appear.
10 · How to Test Dark Transitions
Use Black → White, Black → Red, or Black → Blue patterns. VA panels frequently struggle with dark transitions, revealing dark smearing or purple trailing.
11 · How to Test Bright Transitions
Observe Gray → White and White → Gray sweeps. These help detect subtle luminance latency and verify transition symmetry between rising and falling brightness levels.
12 · How to Test Color Transitions
Primary color channel transitions (Red, Green, Blue to Black) test individual subpixel response speeds. Asymmetric decay between subpixels creates tinted trailing.
13 · How Motion Reveals Response Problems
Continuous movement of high-contrast objects across the screen forces rapid back-to-back transitions, making smearing, trailing, and edge softness immediately apparent.
14 · Why Browser Tests Cannot Measure Physical GTG
Browsers operate inside a software sandbox with no access to photodiode sensors or panel scanout hardware. They provide controlled visual patterns and rendering timings, not hardware oscilloscope data.
15 · When Professional Hardware Testing Is Needed
Accurate quantitative GTG and MPRT curves require high-speed optical photodiode sensors, digital oscilloscopes, and pursuit camera rigs in controlled laboratory environments.
Display response time measures the duration required for a pixel to transition from one color or brightness value to another. Faster response times reduce visible trailing, ghosting, and smearing behind moving objects.
GTG (Gray-to-Gray) measures the time it takes for a pixel to shift between different shades of gray. Because monitor manufacturers typically measure only the single fastest GTG transition under aggressive overdrive, advertised GTG times often differ from real-world usage.
MPRT (Moving Picture Response Time) measures the perceived duration a pixel remains visible on the human retina during continuous motion. Unlike GTG (pixel physical state change), MPRT is primarily determined by refresh rate and display persistence (sample-and-hold blur).
For competitive gaming, a true average GTG response time below 3ms is considered excellent. For general gaming and productivity, average GTG times under 5–8ms provide clean motion without distracting trails.
Usually no. The '1ms' specification advertised by monitor manufacturers is almost always a single best-case transition achieved using maximum overdrive, which often causes severe inverse ghosting (overshoot/halos) that is unusable in normal play.
A higher refresh rate reduces MPRT (persistence blur) because each frame is shown for a shorter period (e.g. 6.94ms at 144Hz vs 16.67ms at 60Hz). However, it does not physically accelerate the monitor's liquid crystal GTG transition speed.
Yes. Pixel overdrive applies a higher voltage spike to liquid crystal molecules to force them to rotate faster into their new alignment, dramatically speeding up transitions.
Yes. Excessive overdrive causes pixel molecules to rotate past their intended color state before settling. This produces bright or inverted halos trailing behind moving objects, known as inverse ghosting or overshoot.
Ghosting is a visible trail or faint replica left behind an object moving across the screen, caused by pixels taking longer to change color than the duration of a single refresh cycle.
Inverse ghosting (pixel overshoot) is a bright or colored trail that appears in front of or behind moving objects when monitor overdrive voltage is set too aggressively.
You can visually test response behavior using high-contrast transitions, dark-to-light patterns, and fast-moving targets like those in this tool, watching for dark smearing, trails, or overdrive overshoot.
No. Web browser JavaScript runs in a high-level sandbox and has no access to physical optical sensors, photodiodes, or monitor panel electronics. Browser transition durations represent software animation timings, not physical GTG.
No. MPRT requires an optical pursuit camera tracking the display at physical panel sweep velocity. This tool provides visual patterns so you can evaluate perceived motion clarity with your own eyes.
Trailing occurs when pixel response times exceed the frame interval of your monitor, or when eye tracking across a sample-and-hold display smears the image across your retina.
On many LCD technologies—especially VA (Vertical Alignment) panels—liquid crystal molecules take significantly longer to rotate out of a deep black state (deep off-state). This creates noticeable black smearing in dark scenes.
Human eyes track moving objects smoothly. Because modern LCD and OLED displays hold each frame static until the next refresh (sample-and-hold), the image smears across the retina even if pixel response time is instantaneous.
Yes. OLED pixels emit their own light and change electrical states in roughly 0.03ms to 0.1ms—hundreds of times faster than traditional liquid crystals—virtually eliminating GTG trailing.
Standard 60Hz office IPS monitors often have 10–14ms response times, resulting in noticeable trailing. Modern Fast-IPS gaming panels, however, achieve 3–5ms average response with minimal smearing.
Yes. VA panels offer excellent static contrast (3000:1+), but their black-to-dark-gray transitions are notoriously slow (often 20–30ms+), causing dark textures to smear visibly when panning in dark environments.
Ready to inspect your display's response?
Visually inspect pixel transitions, trailing and motion response with controlled test patterns.