Monitor Ghosting and Overdrive Explained (How to Fix Ghosting)
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Monitor ghosting is a faint trail or smear that follows moving objects, and it is caused by slow pixel response time — the pixels can’t change color as fast as new frames arrive. The fix is your monitor’s overdrive setting (also labeled Response Time, Trace Free, or OD): set it to the middle level to speed up pixel transitions, but not to the maximum, which overshoots and creates a bright “inverse ghosting” trail instead. This guide explains what ghosting is, how overdrive works, and how to dial it in without introducing overshoot.
What ghosting actually is
Every pixel on an LCD takes time to change from one color to the next. That time is the panel’s response time, measured in milliseconds grey-to-grey (GtG). When an object moves across the screen, each pixel it passes over has to transition to a new color for the new frame — and if the object moves faster than the pixel can finish that transition, the previous color is still partly visible. Stacked across a few frames, that leftover image reads as a trail or smear behind the object: ghosting.
Two things make ghosting worse:
- Panel type. VA panels have the slowest transitions, especially dark-to-bright, so they show the heaviest smear (often called “black smear”). TN panels are fastest and ghost the least; IPS sits in between.
- Refresh rate. At 144Hz a new frame arrives every ~6.9 ms, and at 240Hz every ~4.2 ms. If a pixel needs 8–10 ms to fully transition, it literally cannot finish before the next frame — so higher refresh rates expose slow pixels that looked fine at 60Hz.
Ghosting is a pixel-response problem. It is not the same as motion blur from your eye tracking a moving object (that’s sample-and-hold blur, reduced by backlight strobing), and it is not input lag.
How overdrive fixes it
Overdrive speeds up pixel transitions by briefly applying extra voltage, pushing the pixel toward its target color harder than normal so it gets there before the next frame. It’s the single setting that controls ghosting, and manufacturers give it different names:
| Brand | Overdrive setting name |
|---|---|
| ASUS | Trace Free (0–100) |
| MSI | Response Time (Normal / Fast / Fastest) |
| Gigabyte / AORUS | Overdrive (Off / Picture Quality / Balance / Speed) |
| Acer | Overdrive (Off / Normal / Extreme) |
| BenQ / Zowie | AMA (Off / High / Premium) |
| Samsung | Response Time (Standard / Faster / Fastest) |
| LG | Overdrive / Response Time (Off / Normal / Fast / Faster) |
| Dell / Alienware | Response Time / Overdrive |
Find whichever of these your monitor has in its OSD (on-screen menu), usually under a “Gaming” section.
The overshoot trap: don’t max it out
More overdrive is not better. Push a pixel too hard and it overshoots — it flies past the target color, then falls back, leaving a bright or inverted halo. This is inverse ghosting (also called overshoot or coronas), and it is often uglier than the original smear.
The correct approach is a middle setting:
| Overdrive level | Result |
|---|---|
| Off / lowest | Slow pixels, visible dark trailing (ghosting) |
| Middle (Normal / Fast / level 2–3) | Clean motion — the target for most monitors |
| Highest / Extreme | Overshoot, bright inverse-ghosting halos |
Set overdrive to the middle level, then look at fast motion in-game or on a test pattern. If you still see a trail, go up one step. If you see bright halos or inverted edges, go down one step. The best level also shifts with refresh rate, so re-check overdrive whenever you change your refresh rate — the setting that looked clean at 60Hz can overshoot at 144Hz and vice versa.
How to test your monitor for ghosting
You don’t need special hardware:
- Open the Blur Busters UFO Motion Test (testufo.com) in your browser at your monitor’s full refresh rate.
- Watch the moving UFO. A dark trail behind it is ghosting; a bright/light trail in front of or behind it is overshoot.
- Change the overdrive level in your monitor’s OSD and re-run the test until the trailing is minimized without adding halos.
- Confirm in an actual game with fast horizontal motion (strafing in a shooter, a racing game pan).
While you’re tuning motion, make sure your monitor is otherwise set up for gaming — the right refresh rate, Game mode for low processing lag, and the correct cable. See how to optimize your monitor and reduce input delay.
What overdrive won’t fix
Overdrive tightens pixel transitions. It does not change:
- Input lag — that’s the monitor’s signal processing; use Game/low-latency mode. Response time and input lag are two different things.
- Sample-and-hold motion blur — the blur you get from your eyes tracking motion on any non-strobing display. That’s reduced by backlight strobing / BFI, not overdrive.
- Frame rate or stutter — a smooth-looking panel still needs consistent frametimes; ghosting and stutter are unrelated.
If motion still looks soft after you’ve dialed in overdrive, the remaining softness is almost always sample-and-hold blur (a refresh-rate and strobing question), not ghosting.
Related guides
Frequently asked questions
What causes monitor ghosting?
Ghosting is caused by slow pixel response time. Each pixel needs time to change from one color to the next (measured in milliseconds, grey-to-grey), and if a moving object outruns that transition, the old image lingers for a frame or two and you see a faint trail behind it. It is worst on VA panels, which have the slowest dark-to-bright transitions, and it gets more visible at higher refresh rates because frames arrive faster than sluggish pixels can keep up.
What is monitor overdrive?
Overdrive is a setting that forces pixels to change color faster by briefly pushing them with extra voltage. It goes by different names — Overdrive, Response Time, Trace Free, OD, AMA, or Rampage Response — depending on the brand, and usually has levels like Off, Normal, Fast, and Fastest. A moderate level removes most ghosting; too much overdrive overshoots the target color and creates inverse ghosting instead.
What is inverse ghosting or overshoot?
Inverse ghosting, also called overshoot or coronas, is a bright or inverted-color trail that appears when overdrive is set too high. The pixel is pushed so hard it shoots past the target color before settling, leaving a light halo behind moving objects — the opposite of a normal dark smear. The fix is to lower the overdrive level by one step until both the trail and the halo are minimized.
Does monitor ghosting cause input lag?
No. Ghosting is a pixel-response problem — how fast the panel physically changes color — while input lag is how long the monitor takes to process and display a signal. They are separate. A slow-transitioning panel can smear without adding any felt input delay, and a fast panel can still have high processing lag. Fix ghosting with overdrive; fix input lag with the monitor's Game or low-latency mode.
What is the best overdrive setting for gaming?
Use the middle overdrive level — usually 'Normal' or 'Fast', level 2 of 3 or 3 of 5. It clears most ghosting without introducing overshoot. The highest setting almost always causes inverse ghosting on modern panels, so avoid it unless you can visibly confirm it looks cleaner. The ideal level also changes with refresh rate, so re-test overdrive after you change your refresh rate.