Screen Bleeding Test
Check for backlight bleed on your display. Run the browser-based check and follow its prompts to review the result.
Backlight glow varies by panel and viewing angle. Compare dark shades at your normal viewing brightness.
Tool guide
About Screen Bleeding Test
Show dark and gray patterns that can make uneven backlight glow or edge bleed easier to notice on some LCD screens. The test helps visual inspection but cannot determine whether a panel meets a manufacturer's warranty standard.
How to use this tool
- 1Dim the room slightly and set the display to a normal viewing brightness.
- 2Start the test and inspect the dark and gray patterns from a typical viewing position.
- 3Take a photo only if needed for support, then compare the result with manufacturer guidance.
How the tool works
The page displays a small set of near-black and dark-gray colors. Your eyes assess uneven illumination; camera exposure, room light, panel type, and viewing angle strongly change the appearance.
Worked real-world example
A glow near a screen corner may be more visible in a dark room than in normal daytime use.
Common scenarios and use cases
Look for noticeable light leakage on an LCD panel or document a display concern for support.
Important details and limitations
OLED panels, IPS glow, reflections, and camera exposure can be mistaken for backlight bleed. Do not press on the screen. Use the manufacturer's process to decide whether a display is defective.
Check the output unit as well as the number. If the result will be reused in another calculation, retain full precision where possible and round only at the end. For measurements governed by a technical specification, use the standard and tolerance required by that document.
Frequently asked questions
Is any glow proof of a defect?
No. Panel type, viewing angle, and brightness affect what you see.
Why does a camera photo look worse?
Camera exposure can exaggerate dark-room glow.
Can the browser repair bleed?
No. It only shows inspection colors.
About Screen Bleeding Test
Check for backlight bleed on your display. Run the browser-based check and follow its prompts to review the result.
How to use this tool
Use the controls above to run the check. Results are measured or calculated in your browser. Some device features require browser support, a secure connection, or permission from you.