Banding
Smooth gradients should not show hard steps. Visible bands usually mean 6-bit color plus dithering, an aggressive profile, or a compressed image path.
Diagnostic suite · 11 patterns
Monitor test
Eleven full-screen patterns that reveal banding, backlight bleed, ghosting, poor uniformity and scaling problems — plus a live readout of what your browser reports about the display.
Your display, as the browser sees it
These values come from the browser and the operating system. They describe the current window, not the panel's maximum capability.
- Viewport
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- Pixel ratio
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- Color depth
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- Color gamut
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- Dynamic range
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- Refresh rate
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Diagnostic suite · 11 patterns
Run a pattern
Click any card to open it full screen. Arrow keys move to the next pattern; Esc exits.
How to read the results
Backlight bleed
On a black screen, bright patches near the edges are bleed. A faint glow in the corners of an IPS panel is normal; large cloudy patches are not.
Ghosting
A moving white block should have a short, faint trail at most. Long smears mean a slow panel or an overdriven response setting.
Sharpness
The 1 px grid should look like a clean grid, not a moiré pattern. If it shimmers, the display is scaled and not running at native resolution.
Found a bad pixel?
A single bright dot is worth a repair attempt. A black dot is usually a warranty conversation.