Dead Pixel Test
Check for dead, stuck and abnormal pixels.
Start testFree monitor utility
Ghosting Test
Run a monitor ghosting test to inspect moving edges for visible trails, smearing, halos and response-time artifacts.
Original CSS test patterns · Time-based motion · No download required
Estimated Refresh Rate
Frame Time
Browser timing may be affected by system load, browser settings and variable refresh rate. For a dedicated measurement, use the Refresh Rate Test.
Practical inspection
How to Run a Ghosting Test
Start the fullscreen test and follow the moving target with your eyes rather than staring at the center of the track. Try the preset speeds, use the exact-speed slider, then select Compare 3 Speeds to inspect 240, 480 and 960 px/s together. Compare white-on-dark and black-on-white transitions, plus the line and checker patterns. Look for a trail, duplicated edge, smearing or bright and dark halos. If your monitor provides an overdrive control, compare its settings one at a time.
Pursuit-camera note: A phone video can help document a repeatable trail only when the camera follows the target smoothly. Exposure, rolling shutter and camera processing can create artifacts, so do not treat a casual photograph as a response-time measurement.
How to Read the Moving Trail
| What You See | Possible Interpretation |
|---|---|
| A darker smear following the target | Conventional ghosting from a transition that has not settled before the next frame. |
| A bright or opposite-color halo | Possible overshoot or inverse ghosting from aggressive overdrive. |
| A clean edge at moderate speed but a trail at very high speed | Normal transition limits may be becoming visible; compare with real content. |
| Irregular jumps across every pattern | Browser load or unstable frame delivery may be involved; confirm the timing readout and repeat. |
What Is Monitor Ghosting?
Monitor ghosting appears as a visible trail behind a moving object when some pixels do not transition quickly enough from one shade to another. It is often easiest to see around high-contrast edges during scrolling, games or fast video. The appearance can depend on the panel, transition colors, refresh rate, frame rate and overdrive setting. This browser test supplies repeatable moving patterns for a visual comparison, but it does not measure response time with laboratory equipment or assign a universal quality grade.
Ghosting vs Motion Blur
Ghosting is mainly associated with pixel response behavior and may form a distinct trail or duplicate edge. Motion blur is broader: sample-and-hold display behavior, eye tracking, frame rate, camera exposure and content can all contribute to perceived blur. The effects can appear together, but they are not identical. Compare several patterns and speeds instead of treating every soft moving edge as ghosting.
What Is Inverse Ghosting?
Overdrive is designed to accelerate pixel transitions. When the setting is too aggressive for a particular transition, the pixel can overshoot the intended value and create a bright or dark halo around the moving object. This is commonly called inverse ghosting or overshoot. Compare the white rectangle on a dark background with the black rectangle on white, and look for a halo that contrasts with the normal trailing color. A different overdrive setting may change the result, but the most suitable option depends on the monitor and refresh rate.
Ghosting in Gaming Monitors
Ghosting is particularly noticeable in fast-moving games, which is why response time and overdrive tuning are important when evaluating gaming monitors. Use this test alongside real content at the refresh rate, brightness and overdrive setting you normally use. A browser result can reveal visible behavior, but it cannot identify the panel model, cable capability or firmware tuning.
Method and limitations
How This Ghosting Test Works
The target position is calculated from elapsed high-resolution browser time and updated with requestAnimationFrame(), so motion speed is expressed in CSS pixels per second rather than frames per step. The test runs locally and uploads no result. It is a repeatable visual comparison, not a laboratory response-time measurement; measuring pixel transitions in milliseconds requires optical equipment such as a photodiode or a properly configured pursuit-camera system.
Common questions
Ghosting Test FAQ
What is a monitor ghosting test?
It uses moving high-contrast targets to make visible trails, smearing and response-time artifacts easier to inspect.
What causes monitor ghosting?
It commonly relates to pixel transitions that are slow relative to the changing image, although refresh rate, frame rate and processing can affect what you see.
Can overdrive reduce ghosting?
A suitable overdrive setting can reduce some transition trails, but excessive overdrive may create inverse ghosting or halos.
What is inverse ghosting?
It is a bright or dark halo caused when an overdriven pixel transition overshoots the intended value.
For distributors and brands
Testing Monitors for an OEM Project?
Yanxun Display supports OEM gaming and office monitor projects. Refresh rate, panel response behavior, overdrive tuning and display specifications can be reviewed according to project requirements.