Screen Clouding and Backlight Bleed Test
Inspect a dark full-screen image for pale clouds, bright corners, pressure-related patches, and uneven backlight distribution.
A black reference under controlled viewing conditions reveals broad luminance irregularities that are hidden in bright content. Use a dim room, normal seating position, moderate brightness, and compare the display straight on without relying only on a phone photo.
What does this test measure?
A black reference under controlled viewing conditions reveals broad luminance irregularities that are hidden in bright content.
Why is this test important?
Inspect a dark full-screen image for pale clouds, bright corners, pressure-related patches, and uneven backlight distribution.
How do you run the test?
Use a dim room, normal seating position, moderate brightness, and compare the display straight on without relying only on a phone photo.
How should results be interpreted?
Localized pale zones can be clouding or bleed, while angle-dependent corner glow may be characteristic of the panel technology.
Normal and problematic results
Localized pale zones can be clouding or bleed, while angle-dependent corner glow may be characteristic of the panel technology.
Technical limitations
There is no universal browser threshold; camera exposure and excessive brightness can make a normal panel appear worse.
Why can the score decrease?
Unstable measurements, denied permissions, unsupported browser APIs, background load, power saving, or an incomplete test can affect the result. When a score changes, the result screen explains the reason.
What should you do if a problem is found?
Reset brightness and local-dimming settings, remove panel pressure, compare another input, and consult the maker if severe patches remain.
Example Result Explanation
Frequently Asked Questions
What is monitor clouding?
Clouding is uneven backlight visible as lighter cloudy patches on a dark screen, usually caused by slight pressure or unevenness in how the panel layers sit in the frame. It is distinct from edge bleed, which comes from the borders inwards.
How much clouding is normal?
Nearly every edge-lit LCD shows some in a dark room. It becomes a real fault when it is visible during ordinary use rather than only on a black test screen, or when it covers a large part of the picture.
Can clouding be fixed?
Occasionally it settles over the first weeks of use. Beyond that it is a panel assembly issue, not something a setting can correct, so a severe case is worth raising with the manufacturer while the warranty is current.