Display Tests
Browser-based display checks for pixels, color and tonal patterns, grayscale, black/white separation, gradients, touch, motion timing, ghosting, and resolution.
10 tests
Common problems and tasks
Choose the right path
Color tint, crushed shadows, clipped highlights, gradient banding, low smoothness, tearing, trails, fixed pixels, touch gaps, and resolution context need distinct instruments.
Display troubleshooting
Choose the right display test
Start with what you see on the screen—or the browser/display value you want to inspect.
Color & tonal response
Pixels & touch
- Dead Pixel TestUse fullscreen solid colors to visually inspect suspicious dark, bright, or stuck-looking pixels across the target display. You observe the screen; the webpage does not automatically detect a defective pixel or issue a warranty judgment.
- Stuck Pixel FixerUse a controlled color cycle only after identifying a suspected stuck pixel. This is an attempted visual intervention with no dead-pixel repair guarantee; true dead pixels are not claimed fixable.
- Touch Screen TestUse browser pointer and touch events to check touch coverage, drawing continuity, edges, corners, and multi-touch behavior. Mouse simulation is not equivalent to real touch, and untouched cells alone are not automatic faults.
Motion & timing
- Refresh Rate TestEstimate current browser presentation timing from requestAnimationFrame intervals—not the panel's maximum refresh-rate certification.
- FPS TestInspect browser animation FPS, frame times, 1% low, long frames, and stalls under the existing modes. This is not a game benchmark or GPU benchmark.
- Frame Skipping TestUse browser timing plus a moving visual pattern to investigate possible frame skipping, long frames, stalls, and stability—not a guaranteed physical panel drop count or hardware certification.
- Screen Tearing TestUse moving patterns to visually look for possible tearing or uneven motion. The page cannot read VSync state and is not a hardware diagnosis.
- Monitor Ghosting Test — Motion Trails & Inverse GhostingUse moving shapes and text edges at different speeds and contrasts to inspect trails, inverse trails, smearing, or visible motion blur—not exact panel response-time measurement in milliseconds.
Screen information
Rapid flashing can cause discomfort or seizures in sensitive users; stop immediately if unwell.
Display first pass
Checking a new or used display?
Run a short browser-visible first pass before deciding whether a more specific check is needed.
If the device is a touchscreen, add Touch Screen Test when touch input matters.
Browser-visible first pass only—not a calibration report, warranty grade, or complete panel-health certificate.
Better comparisons
Run a clean display check
Use the display you mean to inspect
If multiple displays are connected, move the browser window to the target display before starting. For visual pattern tests, use fullscreen when the dedicated tool instructs or offers it so browser chrome does not cover the area you want to inspect.
Keep relevant conditions consistent
When comparing results, keep applicable conditions consistent: target display, browser, window or fullscreen mode, browser zoom, OS scaling, selected refresh-rate/display mode, and relevant monitor settings such as brightness or overdrive.
Change one variable and repeat
If the phenomenon looks suspicious, change one applicable condition—browser, cable or port, refresh-rate mode, fullscreen/window mode, display setting, or connection path—and test again before concluding the panel or hardware failed.
Visual checks
Dead Pixel Test, Monitor Color Test, Stuck Pixel Fixer, Screen Tearing Test, and Monitor Ghosting Test use display patterns or visual aids and depend on what you actually observe. They cannot automatically provide exact panel response time in milliseconds, calibrated color accuracy, a laboratory contrast ratio, a panel-health certificate, or a warranty verdict. Stuck Pixel Fixer is an attempt only, with no repair guarantee.
Browser-observed timing
Refresh Rate Test, FPS Test, and Frame Skipping Test use browser scheduling, requestAnimationFrame, and browser presentation observations. They are not panel factory certification, an advertised maximum, a GPU benchmark, a local game benchmark, or a guaranteed physical dropped-frame count.
Browser-reported / direct information
Screen Resolution reports browser-reported screen, viewport, and devicePixelRatio information; Touch Screen Test reports browser pointer/touch evidence. Physical or native pixel values may be estimates, and these readings do not certify factory panel specifications or touch-controller electrical behavior.
Display Tests
10- Dead Pixel TestInspect nine solid colors for dark, bright, or fixed-color pixel anomalies.Displayvisual
- Refresh Rate TestEstimate browser-observed presentation cadence in hertz.Displaybrowser observed
- Touch Screen TestCheck browser touch coverage, continuity, edges, corners, and multi-touch.Displaydirect
- FPS TestMeasure browser animation FPS, frame time, long frames, and stalls.Displaybrowser observed
- Frame Skipping TestInvestigate browser timing and a visual sequence for possible skipped frames.Displaybrowser observed
- Screen Tearing TestUse moving patterns to look for visible horizontal tearing or uneven motion.Displayvisual
- Monitor Ghosting Test — Motion Trails & Inverse GhostingInspect moving edges for trails, inverse trails, smearing, or visible blur.Displayvisual
- Stuck Pixel FixerTry a bounded color cycle after confirming a suspected stuck-colored pixel.Displayvisual
- Screen ResolutionRead browser-reported screen, viewport, scaling, and DPR information.Displaydirect
- Monitor Color TestInspect static browser-rendered color and tonal patterns without claiming calibrated measurement.Displayvisual