Black Screen Test - Fullscreen Black Display
Open a fullscreen black screen test to check backlight bleed, bright or hot pixels, OLED image retention, edge light and dark-room uniformity.
Quick answer
A fullscreen black screen is useful for spotting hot pixels, stuck bright pixels, backlight bleed, edge glow and some OLED image retention marks.
Method: ScreenTestKit generates the test surface in your browser. Results depend on visual inspection; the site does not read or diagnose physical panel hardware.
How to use this test
- Use normal brightness first, then briefly compare a darker room if checking backlight bleed.
- Open the black screen fullscreen and let your eyes adjust for a few seconds.
- Scan the center, edges and corners for fixed bright dots or light patches.
- Follow up with white, gray or OLED tests if a mark remains visible.
What to watch for
- Tiny bright dots that stay in the same physical location.
- Light leaking from an edge or corner of an LCD panel.
- Glow that changes strongly when you move your viewing angle.
- Faint OLED marks from fixed logos, status bars or navigation UI.
How to interpret results
Bright dot
A fixed bright dot on black is more consistent with a stuck, hot or bright pixel than a dead black pixel.
Edge light
If light is visible during normal dark content, run the backlight bleed test and document brightness settings.
Camera looks worse
Phone photos often exaggerate black-screen glow, so judge normal-use visibility with your eyes.
Frequently asked questions
Should I test in a completely dark room?
Use normal lighting first. A dark room helps reveal bleed, but it can also make minor glow look more serious.
Can a black screen fix burn-in?
No. It is only a visual test surface.