Compare the black field at normal brightness and viewing position first. If you change room light, viewing angle or actual display brightness, record one change per comparison. The guidance selector is a label for the run, not a brightness measurement.
Part of the Screen test for dead and stuck pixels. Run the full screen test first for a complete device check.
The same area looks different The pattern does not fill the display The symptom persists
Screen bleeding test
Use the screen bleeding test to compare uneven bright areas on a black field at your normal brightness and viewing angle. Treat the result as a visual observation, not a measurement of panel damage.
Also known as: screen bleeding test, backlight bleed test, ips glow test, screen bleeding test android, black screen test. Free, online, and no download required.
No permission neededNothing uploaded
Dim the room, raise display brightness and enter the black pattern.
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What the screen bleeding test checks
| Check | How it is measured | Fails when |
|---|---|---|
| Black field | A full-viewport black test pattern removes surrounding page chrome. | The browser cannot enter fullscreen. |
| Brightness step | The selected guidance level is recorded with the run. | The level changes during comparison. |
| Marked areas | Normalized coordinates retain repeatable uneven regions. | Marks move after leaving fullscreen. |
How to run the screen bleeding test
- Prepare the device and close any application that could reserve the same input or media stream.
- Start the screen bleeding test, follow the live prompt and complete every named control or direction.
- Finish the run, record the verdict and repeat once before changing one setting or connection.
If something failed
Use the existing fullscreen control and check the exposed area. Browser bars or system scaling can change what is visible. Record an incomplete view rather than treating a hidden edge as a passed check.
It cannot quantify panel uniformity, luminance or the physical cause of a patch. It cannot establish whether the manufacturer will accept a claim. The screen bleeding test documents a viewing condition and local marks; use that record with model-specific support rather than a universal pass or fail threshold.
02
How to read the result
Screen bleeding test on Android and iPhone
Keep conditions fixed. The screen bleeding test android workflow uses the same black field as the desktop check, while fullscreen and browser controls depend on the device. Note any area hidden by navigation bars before judging a dark corner that the pattern did not cover.
Does the bright patch change when you move your head? Compare from the normal seating position and one nearby angle. An ips glow test uses that change as an observation, but it cannot isolate the physical cause. Backlight bleed, reflections, local dimming and camera exposure can produce different appearances.
A backlight bleed test needs room-light and brightness notes. The guidance selector does not change system brightness. Adjust the actual display control if comparing levels, then record the condition. Use the monitor check guide to keep this black screen test separate from pixel and colour checks.
How the screen bleeding test works
This page uses the same fullscreen and normalized-coordinate controller as the main screen tool but limits the pattern to black. A brightness guidance selector records the viewing condition without attempting to change system brightness. Clicks add or remove local markers that remain available after fullscreen exits. Follow the how to test monitor when you need a complete troubleshooting sequence.
Use the screen bleeding test in a visible foreground tab and keep the device, connection and duration unchanged. Repeat the same action enough times to separate one missed browser event from a persistent pattern. Record the displayed value before changing one setting, then run the same sequence again.
During Screen bleeding test, the live readouts update from bounded counters and recent samples. Complete every requested direction, key, channel or phase before finishing. Reset between devices so events from an earlier run cannot alter the next verdict, and keep the tab focused whenever timing or event frequency is part of the result.
What the result can establish
Compare the black field at normal brightness and viewing position first. If you change room light, viewing angle or actual display brightness, record one change per comparison. The guidance selector is a label for the run, not a brightness measurement.
Use the screen bleeding test in a visible foreground tab and keep the device, connection and duration unchanged. Repeat the same action enough times to separate one missed browser event from a persistent pattern. Record the displayed value before changing one setting, then run the same sequence again.
Read pass as confirmation of the collected sample, warn as a repeatable concern that needs comparison, fail as a missing or abnormal signal with a direct next action, and inconclusive as too little valid input. The number in the detail explains which threshold or count produced the status for Screen bleeding test.
Measurement limits
A photographed or browser-rendered result cannot quantify panel uniformity. Reflections, local dimming, camera exposure and viewing angle can create or hide uneven regions.
The Screen bleeding test reads only signals that the operating system and browser expose to this page. It cannot inspect physical wear, firmware queues, electrical contacts, analogue circuitry or another application's private processing. A clean run confirms the observed sample, while an intermittent fault may require a longer repeat under the same conditions.
Browser scheduling, power saving, wireless transport, display timing and background work can alter the values shown by Screen bleeding test. Compare results only when those conditions match. Do not treat a small difference as a hardware change unless it repeats across several controlled runs.
03
Screen bleeding test questions
How much backlight bleed is normal on an LCD panel?
There is no universal visible-patch threshold supplied by this browser test. Appearance depends on brightness, lighting, panel technology and viewing angle. Record whether the same region affects normal content at your usual settings, then consult the manufacturer's model-specific guidance. A black photograph alone cannot establish an acceptable or faulty panel.
What is the difference between backlight bleed and IPS glow?
The terms describe different display effects, but this page cannot diagnose their physical mechanisms. Compare the patch from your normal position and nearby angles while brightness stays fixed. A patch that changes appearance with angle is useful evidence to record. Do not treat that change as a complete hardware classification.
Should I photograph the result of the black screen test?
A photograph can document what you saw, but exposure and viewing angle can exaggerate or hide it. Record the display brightness, room light and camera conditions alongside the image. A normal screenshot usually records the rendered black field rather than physical light leakage, so it cannot replace a visual comparison.
What is backlight bleed?
Backlight bleed refers to unwanted uneven light visible from a backlit display, especially on dark content. This page supplies a black field for comparison. It cannot measure the amount, establish the internal cause or apply a warranty threshold. Compare your normal use and the manufacturer's guidance for the exact model.
How do I run a screen bleeding test on Android?
Open the test, keep the phone at a stable angle and use fullscreen if the browser permits it. Compare the exposed black area at comfortable system brightness. Note browser bars and reflections. A screen bleeding test android result cannot inspect hidden display areas or automatically distinguish every panel technology.
How should I repeat the screen bleeding test fairly?
Keep actual brightness, room light, angle and device fixed, then repeat the same region. Change one condition only after recording the first observation. The on-page brightness guidance does not alter the display setting. Comparing two photographs with different exposure is not a controlled repeat of this test.
What can the screen bleeding test not prove?
It cannot quantify panel uniformity, luminance or the physical cause of a patch. It cannot establish whether the manufacturer will accept a claim. The screen bleeding test documents a viewing condition and local marks; use that record with model-specific support rather than a universal pass or fail threshold.