Device tests · Display
Monitor Test
Inspect larger display patterns with manually selected black, white, gray, color, gradient and geometry fields. Use this monitor test for visual uniformity, banding and scaling observations rather than individual-pixel diagnosis.
You inspect the patterns yourself. Testpartout does not photograph the screen or calculate color accuracy, bleed percentage, HDR capability or a panel-quality score.
- Local observations
- No hardware certification
Patterns change only when selected. Use comfortable brightness; no automatic detection or calibration.
Your visual observation
Inspect patterns yourself. The browser cannot quantify bleed, color accuracy, HDR or panel bit depth.
Your result
What your result means
A broad bright region on black may be backlight leakage, viewing-angle glow, reflections or display processing. Its appearance can change with brightness, room light and where you sit. A visual observation alone cannot determine whether a panel meets a warranty criterion.
Gray fields can reveal larger brightness or tint differences. Smooth gradients can reveal visible banding, but browser rendering, profiles, compression in other content and output processing can also affect what you see. This page renders patterns locally; it does not isolate the panel from the display pipeline.
Geometry and checkerboard patterns are laid out in CSS pixels. Zoom and operating-system scaling affect their alignment. They are not guaranteed to map one-to-one onto physical pixels, and unusual spacing does not automatically mean a damaged monitor.
Procedure
How the test works
- 01
Prepare viewing conditions
Use comfortable brightness and ordinary room light. Disable optional processing only when you understand the setting and note the original value. Keep viewing distance and angle similar between comparisons.
- 02
Start and select deliberately
Choose one of twelve patterns from the selector. There is no automatic cycling or flashing sequence. Pause long enough to inspect the whole field.
- 03
Inspect black and gray
Look for broad bright or tinted patches. Change your viewing angle slightly to distinguish angle-dependent appearance from a fixed-location observation.
- 04
Compare gradients and colors
Inspect transitions for abrupt visible bands and color fields for obvious larger irregularities. Do not treat this as a calibrated color reference.
- 05
Check geometry
Use grid and checkerboard patterns to look at scaling and alignment under the current browser zoom. Compare OS output resolution separately.
- 06
Finish with a local note
Hide controls for a cleaner field if useful; Show controls / Exit stays reachable. Finish or Escape ends the inspection. The optional observation remains only on this page.
Methodology
How Testpartout measures this
This implementation uses browser observations and local calculations, with no hardware certification.
What the implementation does
- Twelve browser-rendered patterns include seven solid fields, grayscale and color gradients, color bars, a geometry grid and a checkerboard.
- Patterns are selected manually. No timing-based sequence, flashing or automatic repair routine is present.
- CSS-defined diagnostic colors and pattern geometry are independent of the site theme. The browser and display pipeline still control physical output.
- Fullscreen is requested only by an explicit control; unsupported or declined requests leave a usable in-window pattern.
- Optional summary choices are user observations. No image analysis or automatic fault classification is performed.
Limits of a browser measurement
- This tool does not measure delta E, gamut, HDR, true 10-bit output, response time, luminance or backlight bleed percentage.
- Browser color management, night-light filters, output resolution, scaling and panel settings affect visual appearance.
- No visual inspection guarantees finding every anomaly or determines a manufacturer’s tolerance or return policy.
Privacy
What happens to your data
This section describes the behaviour of the code on this page, not an intention.
- Diagnostic events, coordinates, timings and observations stay in current page memory. They are not uploaded or saved as raw diagnostic data.
- No camera, microphone, account or server storage is used by this test.
- Only start and complete lifecycle events may be sent after analytics consent; no result values are included.
Troubleshooting
If the test does not behave as expected
Glow versus bleed
Angle-dependent glow and more fixed leakage can look similar on a dark field. Compare from your normal position and under normal brightness before drawing a conclusion; avoid exaggerated conditions as a universal pass/fail standard.
Gradient banding
Visible steps can arise from browser rendering, GPU/output processing or the panel. Compare the same field with filters disabled only when safe, then check another known local source. The page cannot identify the exact stage.
Tint and uniformity
Broad tint differences should be compared on gray and white from a normal viewing angle. Reflections or coatings may change apparent tint; clean the screen only as its maker recommends.
Factors
Interpret observations in context
Grid or checkerboard looks uneven
CSS pixel patterns can interact with fractional zoom and OS scaling. Reset browser zoom if appropriate and compare the output resolution in OS settings before suspecting geometry issues.
Fullscreen not available
The page can inspect only the region it occupies. In-window patterns remain useful but cannot expose areas hidden by browser or system chrome.
Pixel-sized suspicious dot
Use Dead Pixel Test for contrasting single-pixel inspection. Monitor Test focuses on larger visual behavior and complements rather than replaces that tool.
FAQ
Frequently asked questions
- Is this a monitor calibration test?
- No. It supplies visual patterns for human inspection and does not measure color accuracy, gamut or calibrated brightness.
- Can it detect backlight bleed automatically?
- No. You observe black and gray fields. Glow, reflections, brightness and viewing angle can affect the appearance, and no bleed percentage is calculated.
- How is this different from Dead Pixel Test?
- Dead Pixel Test focuses on suspicious individual pixels with solid colors. Monitor Test adds gradients, bars and geometry for larger uniformity, banding and scaling observations.
- Do patterns flash or cycle automatically?
- No. Each pattern changes only after a deliberate selection. Stop if any viewing condition is uncomfortable.
- Does the grid map physical pixels?
- Not necessarily. It uses CSS pixels; browser zoom and OS scaling may prevent a one-to-one physical pixel map.
- Is my visual summary saved or uploaded?
- No. The optional observation stays in current page memory and is never sent to analytics.
Found an issue with this test? Report it.