Test Information
The Pixel Walk & Inversion test is one of the most demanding diagnostics for display electronics. It exposes how a panel manages voltage polarity across its pixel grid and checks for interference between the sub-pixel structure and the refresh signal.
🔳 Pattern (Checker, Horizontal, Vertical): Different panels use different “Inversion schemes” (column, row, or dot inversion). Cycle through these using the buttons in the control panel to find which one triggers a reaction from your monitor.
📏 Size (1px, 2px, 4px): Tests the spatial frequency of the inversion. Native 1:1 pixel mapping (1px) is the standard test for most high-end monitors.
🏎️ Speed (Pixels/Frame): Adjust the motion speed using the slider from -20 to +20. Setting speed to Static (0) checks for purely spatial artifacts, while Motion (+1 to +5) is best for finding voltage-related flicker.
↔️ Direction: Negative speeds move the pattern to the left, positive to the right.
⚡ Pixel Walk (Inversion): While looking at the gray pattern, does the screen appear to “flicker” or “shimmer”? Do you see a mesh-like pattern that seems to “walk” across the screen? This indicates the panel’s inversion scheme is struggling to balance voltage correctly.
📡 Crosstalk: Look for horizontal or vertical shadows/lines that extend from the moving pattern across the rest of the screen.
🎨 Asymmetric Response: If the gray pattern takes on a distinct color tint (like green or purple) only when moving, it reveals that the pixels turn on faster than they turn off (or vice versa).
Almost all LCDs show some level of pixel walk on at least one pattern, especially at high refresh rates. However, it should not be visible in normal content. If you see heavy flickering at 144Hz but not at 60Hz, it suggests the T-CON (Timing Controller) is pushed to its stability limit.
This tool helps troubleshoot “Scan Line” issues on Samsung Odyssey monitors, “Pixel Walk” on high-refresh gaming panels, and general VGA/Signal clock interference.