ディスプレイ / 画素応答診断

モニターゴースト・残像・逆残像(オーバーシュート)測定テスト

高速移動するUFOを目で追跡しながら、暗い尾を引く液晶残像(ゴースト)、VAパネル特有の黒にじみ、オーバードライブ過剰による白く光る逆残像(オーバーシュート)を診断します。

移動速度:

現在の表示FPS: 144.0 FPS

通常の残像（GtG応答遅延）

Dark, blurry trails behind the spaceship. Liquid crystals are turning too slowly. Fix: Increase monitor OSD Overdrive setting (e.g. from "Off" or "Normal" to "Fast").

理想的な鮮明度（クッキリ表示）

Clean edges with minimal motion blur and zero trailing halo. GtG transition finishes within the refresh window. Verdict: Ideal competitive gaming tuning.

逆残像（過電圧オーバーシュート）

Bright, glowing white or neon halos trailing behind moving edges. Overdrive voltage is boosted too aggressively. Fix: Turn monitor Overdrive down one step from "Extreme" to "Fast".

モニターの残像・逆残像とGtG応答速度の仕組み

You unbox a high-refresh-rate gaming monitor advertised with "1ms Response Time," launch an action game, and immediately notice dark smears following characters across the screen—or worse, glaring white halos tracing behind every crosshair movement.

Why does monitor ghosting happen, what is the difference between GtG and MPRT, and how do you calibrate your monitor's Overdrive setting to achieve optimal motion clarity?

The Cause of Motion Blur: GtG vs. MPRT

Motion blur on modern flat-panel displays comes from two distinct phenomena:

GtG (Gray-to-Gray) Response Time: The physical time it takes for liquid crystals inside the panel (IPS, VA, or TN) to twist from one shade of gray to another. If a pixel takes 10ms to transition on a 144Hz monitor (where each frame lasts 6.94ms), the pixel will still be shifting when the next frame arrives, leaving a visible smeared tail called Ghosting.
MPRT (Moving Picture Response Time) / Eye Tracking Blur: Even with instant pixel transitions (like on an OLED panel), human retinas naturally track moving objects across a sample-and-hold display. Because the image remains stationary for the entire frame duration, your eye smears the image across your retina as it moves.

Panel Technologies Compared: Fast IPS vs. VA vs. OLED

Panel Technology	Typical Real GtG	Motion Trailing Characteristic	Contrast Ratio
Fast IPS / Nano IPS	2.5ms – 5.0ms	Very low ghosting; balanced transitions	1,000:1
VA (Vertical Alignment)	6.0ms – 35.0ms	Severe Black Smearing in dark scenes	3,000:1 – 4,000:1
QD-OLED / WOLED	0.03ms	Zero Ghosting; near-instant pixel shifts	∞ : 1 (True Black)

Tuning Monitor Overdrive: Avoiding the "Extreme" Trap

To market panels with "1ms" claims, manufacturers include an OSD setting called Overdrive (TraceFree, AMA, Response Time). Overdrive applies an elevated voltage spike to the liquid crystals to force them to twist faster.

Overdrive Off / Low: Transitions are sluggish, resulting in visible dark ghosting.
Overdrive Balanced (Usually "Fast" or "Level 2/3"): Minimizes GtG smearing without exceeding the target color state.
Overdrive Extreme (Overvoltage Overshoot): The liquid crystal twists past its intended color before bouncing back. This creates Inverse Ghosting (coronas)—bright glowing halos that are far more distracting in competitive games than natural motion blur.

よくある質問 (FAQ)

What is monitor ghosting vs inverse ghosting (overshoot)?

Regular ghosting happens when liquid crystal pixels take longer to change color than the refresh cycle, leaving dark smearing or trails behind moving objects. Inverse ghosting (coronas or overshoot) happens when the monitor's overdrive setting is set too aggressively, overshooting the target voltage and leaving bright, glowing white halos behind moving edges.

Why do VA panels show severe black smearing?

VA (Vertical Alignment) panels have deep contrast ratios, but the transition from pure black (0% luminance) to dark gray is the slowest physical twist state for vertical liquid crystals, often taking 25ms to 40ms even on a 144Hz monitor. This causes heavy black streaking behind high-contrast objects.