Panel & Backlight
Blooming Test (Mini-LED)
A bright object on black to judge local-dimming halos.
How to use
- 1Dim the room and click Start.
- 2Move your cursor / finger to drag the bright dot around the black field.
- 3Watch for a glowing halo (bloom) around the bright object.
- 4Press Esc to exit.
FAQ
Why does blooming happen?
Local-dimming backlights have a limited number of zones. A small bright object lights its whole zone, so some glow spills into the surrounding black area.
Tips
- Run it in a dark room; blooming around the bright dot is hard to see with the lights on.
- More dimming zones = less bloom. OLED shows essentially none.
Related tests
Dead Pixel TestFull-screen solid colors to find dead, stuck, and bright pixels.Backlight BleedReveal LCD backlight leakage and IPS glow in a dark room.Brightness Uniformity50% gray field and a 9-zone grid to spot uneven backlighting.Burn-in TestFull-screen fields and a checkerboard to reveal OLED burn-in.
Related guides
Learn more about what this test reveals and how to act on the results.
How to Test a New TV for Dead Pixels and UniformityUse your TV's browser or a phone to run solid-color and gray tests that reveal panel defects and dirty-screen effect.Mini-LED vs OLED: Which Is Better for You?Brightness and burn-in resistance versus perfect blacks and zero blooming. The real trade-offs.HDR Explained: What Makes a Display Actually HDRMost 'HDR' monitors aren't. Here's what real HDR needs — brightness, contrast, and wide color.