01
Prepare the display
Clean the screen, use the device's native resolution, and let brightness stabilize before running Backlight Bleed Test.
ToolsFree browser-based screen test
Backlight Bleed Test
Display black and low-gray fields in a dark room to distinguish edge bleed, clouding, IPS glow, and uneven backlighting.
Panel testsTest workspace
Use every mode and inspect the entire panel, including corners and edges.
Test mode
Use every mode and inspect the entire panel, including corners and edges.
F toggles fullscreen. Arrow keys switch modes. Escape exits.
How to use this test
A repeatable process gives more useful results than a quick glance.
02
Scan methodically
Run every available mode. Move your eyes across the center, edges, and corners instead of staring at one point.
03
Confirm the result
Repeat suspicious patterns at two brightness levels and compare with another display when possible.
What the result can tell you
Backlight Bleed Test
These patterns reveal uneven lighting, clipped shadow or highlight detail, pixel defects, and panel consistency. They are visual checks rather than laboratory measurements.
Testing notes
Disable night-light, color filters, and automatic brightness while comparing colors or tones.
Use a dim room for dark patterns and normal ambient light for color and brightness checks.
Stop flashing or high-contrast motion tests immediately if they cause discomfort.
Frequently asked questions
Can this test prove that my screen is defective?+
It can reveal visible symptoms and help you reproduce them, but warranty decisions should be based on the manufacturer's policy and, when needed, instrument measurements.
Are any test results uploaded?+
No. Patterns, calculations, touch trails, and browser measurements run locally in this tab.
Why does the result change with brightness or viewing angle?+
Panel technology, local dimming, tone mapping, viewing angle, ambient light, and automatic display controls can all change what you see.