OLED True Black & Uniformity
Pure black to confirm pixel shutoff, plus 1%–20% gray fields that expose banding, dirty screen effect, and mura.
Open source • No install • No tracking
Display Diagnostics & Calibration Patterns
Full-screen test patterns for OLED true black, dead pixels, motion clarity, backlight bleed, gamma, and banding — rendered pixel-for-pixel on a canvas, right in your browser.
Your Display
Detected locally- Resolution
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- Color Depth
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- Color Gamut
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- Scaling
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Why PanelProbe
Uncompressed Patterns, Exact Pixels
Test videos are compressed, which smears near-black detail and adds banding. PanelProbe draws every pattern directly to a canvas mapped 1:1 to your device pixels.
Motion Clarity at Native Refresh
Moving targets rendered at your display’s refresh rate — 60 Hz to 500 Hz+ — at 120 to 1440 px/s to reveal ghosting and overdrive halos.
Gamma & Dynamic Range
Line-dither gamma patches from 1.8 to 2.6, black and white clipping grids, a 32-step grayscale, and banding ramps.
Text Fringing & Sharpness
High-contrast text, RGB/BGR subpixel stripes, and 1px gratings to spot color fringing on QD-OLED and WOLED, scaling blur, and moiré.
Bleed, Glow & Viewing Angles
Near-black fields with corner markers to separate fixed backlight bleed from angle-dependent IPS glow, plus color quadrants for off-axis shift.
Phones, Tablets & Touch
Swipe between tests, check status-bar burn-in, visualize PWM flicker through a camera, and map dead touch zones on a 60-cell grid.
Before the Return Window Closes
New Monitor Checklist
Run these checks in a dim room during your retailer’s return period. The studio’s Guided Wizard walks you through them and produces a printable report.
The 5-Minute Panel Check
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Black Field & Bleed
Open 1 in fullscreen. Look for light at the edges, and move your head to tell IPS glow from bleed.
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Dead & Stuck Pixels
Open 3 and click through each solid color. Every subpixel should light up evenly.
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Near-Black Banding
Open 2 at 2%–5%. Look for vertical stripes or cloudy patches.
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Text & Motion
Check text edges on 5, then follow the UFO on 7 for halos or dark trails.
Typical Panel Characteristics
| Trait | OLED | Fast IPS | Mini-LED |
|---|---|---|---|
| Black level | Pixels switch off | Backlit gray | Zone dimmed |
| Response | < 0.1 ms | 1–5 ms | 1–5 ms |
| Common artifacts | Near-black banding | Glow, bleed | Blooming |
| Burn-in risk | Possible | Very low | Very low |
Full Catalog
26 Tests, One Key Each
Every test launches from a card or its keyboard shortcut. Test All steps through the 24 non-strobe tests automatically.
OLED & Uniformity
- 1 0-Nit True Black
- 2 Near-Black Uniformity
- 3 Dead Pixel & Burn-In Field
- 4 Stuck Pixel Reviver
- 5 Subpixel & Text Fringing
- 6 ABL Window Dimming
Motion & IPS
- 7 Motion Pursuit
- 8 Backlight Bleed & Glow
- 9 Viewing Angle Shift
- 0 Sharpness & Scaling
Touch & Mobile
- P Status Bar & Notch Burn-In
- W PWM Flicker Visualizer
- T Touch Digitizer Grid
Color & Gamma
- G 32-Step Grayscale
- C Gamma Calibration
- B Black Level Clipping
- K White Level Clipping
- D Gradient Banding
Stress
- N TV Static Noise
- R RGB Chromatic Noise
- X Particle Storm
- Q Matrix Digital Rain
- E Gradient Storm
- U Rainbow Chaos
- Z Black / White Strobe
- A Auto-Cycle Stress
Studio Shortcuts
- Space Pause / resume
- ←→ Previous / next test
- H Pin the controls
- F Toggle fullscreen
- S Performance panel
- M Mute sounds
- Esc Exit test
Questions
Frequently Asked Questions
Why not just use a test video?
Video codecs discard subtle near-black detail and introduce banding and blocking — exactly the artifacts you are trying to find. Canvas patterns are drawn losslessly at your device’s native resolution.
Can a browser detect my panel’s real bit depth or HDR support?
Only approximately. Browsers report a color depth (usually 24 bits, i.e. 8 bits per channel) and whether the output is wide-gamut or HDR. That describes the signal path, not the panel itself, so PanelProbe labels these values as browser-reported.
How do I read the gamma test?
Enable 1:1 pixel mapping and view it in fullscreen. Each tile surrounds a solid gray patch with fine black/white lines. Step back or squint: the patch that blends into its surround matches your display’s gamma. Most content targets 2.2.
Does it install anything or send data anywhere?
No. It is a static site with no analytics, cookies, or third-party requests — fonts included. Preferences such as theme and mute are saved in your browser’s local storage.
Is it safe for people with photosensitive epilepsy?
Some stress tests flash rapidly. The studio shows a warning before use, the strobe test is excluded from Test All, and flashing tests stop automatically. If you are photosensitive, avoid the Stress category.
Can the Stuck Pixel Reviver fix dead pixels?
Sometimes it helps a stuck LCD subpixel that is lit or partially responsive. A pixel that stays completely dark is usually dead and cannot be revived by software — check your warranty’s dead-pixel policy.