What Is Ghosting and How Do You Fix It?

Ghosting is a smeared trail behind moving objects, caused by pixels changing color too slowly.

Every LCD pixel takes time to twist its liquid crystal from one state to another. If a frame lasts 16.7ms at 60Hz but the pixel needs 20ms to finish the transition, the old image is still partly on screen when the new one arrives — and you see the leftover as a trail.

See it first

Run the Ghosting Test. Watch the moving blocks:

• A faint trail behind the object = ghosting (pixels too slow).
• A bright fringe or inverse trail = overshoot (overdrive too aggressive).

Look at the trailing edge specifically, and track the block with your eyes rather than staring at a fixed point — a trail you can only see while your eyes are locked to the background is usually persistence blur, not ghosting.

The fix: overdrive

Monitors include an overdrive (a.k.a. Response Time, OD, TraceFree, Overshoot) setting that pushes pixels to switch faster.

1. Find it in your monitor's OSD. Manufacturers all name it differently — TraceFree on ASUS, AMA on BenQ, Over Drive on Acer, Response Time on LG and Samsung.
2. Step through the levels while watching the Ghosting Test.
3. Pick the level with the least trailing and no obvious overshoot — usually the middle setting, not the maximum.

Overdrive works by briefly overvolting the pixel so it reaches the target faster. Push it too hard and the pixel overshoots past the target before settling, which is what produces the bright halo or dark corona ahead of and behind moving edges. Overshoot is more distracting than mild ghosting, so when in doubt, back off one level.

Ghosting vs blur vs double images

These get lumped together and have completely different fixes.

• A soft colored trail behind moving edges — slow pixel transitions. Raise overdrive a step and run at a higher refresh rate.
• A bright halo ahead of the edge — overdrive overshoot. Lower the overdrive level.
• The whole image soft while your eyes track it — sample-and-hold persistence. Higher refresh rate, or backlight strobing.
• Two distinct offset copies of the object — TV motion interpolation, or a failing cable or signal. Turn off motion smoothing, then swap the cable.

Persistence blur is the one people most often mistake for ghosting. It happens because the panel holds each frame static for the whole refresh interval while your eyes keep moving, and it affects the entire frame equally rather than leaving a trail behind one object. Motion blur reduction: BFI, ULMB, and backlight strobing covers the strobing techniques that actually address it.

Other factors

• Refresh rate: higher Hz shortens the time each frame is shown, reducing perceived blur. Confirm you are actually running at your panel's maximum — many monitors default to 60Hz when first plugged in. Check with the Refresh Rate Test and fix it with how to enable your monitor's full refresh rate.
• Panel type: VA panels ghost more in dark transitions; TN and good IPS are faster. OLED transitions are effectively instant, so an OLED that looks blurry in motion is showing persistence blur, not ghosting. IPS vs VA vs TN vs OLED breaks down the trade-offs.
• VA black smearing: dark-to-dark transitions are the slowest — judge overdrive using the dark rows of the test.
• Temperature: LCD response slows when the panel is cold. A monitor that smears for the first few minutes after switching on and then settles is behaving normally.
• Advertised response time: the 1ms figure on the box is a best-case grey-to-grey measurement on the fastest transition, often with maximum overdrive engaged. It tells you very little about the dark transitions where ghosting is actually visible.

Variable refresh rate complicates it

With G-Sync or FreeSync active, the refresh rate moves constantly, and the overdrive strength that is correct at 144Hz is too strong at 60Hz. Monitors with variable overdrive adjust automatically; most do not. If you use VRR and your frame rate swings a lot, pick the overdrive level that behaves acceptably at the bottom of your frame-rate range rather than the top, since that is where overshoot does the most damage.

The "best" overdrive can change with refresh rate, so re-check if you switch between 60Hz and your panel's max.

When it is a defect

Ghosting is a characteristic, not usually a fault — every LCD has some. Treat it as a defect only if the trail is severe at the monitor's advertised refresh rate with overdrive optimally set, or if it appeared suddenly on a display that used to be clean. If it is one persistent smear in a fixed area of the screen rather than following moving objects, that's image retention rather than ghosting, and a full-screen solid color will show it far more clearly than a motion pattern.

Set your refresh rate first, then tune overdrive at that rate — doing it in the other order wastes the effort.