Blooming Test
- Halo <1 character — excellent (2304+ zones)
- Halo 1-3 chars — good (1152 zones)
- Obvious trailing halo — 384 zones / edge-lit
- OLED — pixel dimming, zero halo
Professional Blooming Test
Moving block
White block racing across black at three sizes and speeds — halo width is easy to measure.
Subtitle mode
White-on-black text bar reproduces the most common movie halo scenario.
Starfield
Random small bright dots test how local dimming handles pinpoint light sources.
What Is Blooming?
Cause
Dimming zones are larger than the content; one bright dot lights the whole zone, creating a halo.
Zone count
More zones = smaller zones: 384 shows clear halos, 2304+ approaches pixel-level.
vs Backlight bleed
Halos follow bright content; bleed is fixed at screen edges regardless of content.
How to Use
Dark room, fullscreen
Kill ambient light and click the canvas to go fullscreen.
Switch three modes
←→ cycles block/subtitles/starfield, ↑↓ adjusts speed.
Measure the halo
Use subtitle character width as reference and compare with the scale.
Backlight Types
Mini LED 2304+
Flagship zones
- + Tiny halos
- + High peak brightness
- − Expensive
Mini LED 384-1152
Mainstream
- + Good value
- − Subtitle halos visible
Direct-lit
Dozens of zones
- + Cheap
- − Large white wash
OLED
Pixel-level
- + Zero halo
- + Infinite contrast
- − ABL limiting
Optimization Tips
Set local dimming to High in the OSD for movies — contrast improves visibly.
Disable local dimming for office/coding to avoid flickering halos around UI.
Drop dimming one level if game HUD elements show distracting halos.
Subtitle-sensitive viewers can use gray subtitles or lower subtitle brightness.
FAQ
Test Environment
- Fully dark room (halos show best)
- Use your normal brightness setting
- OLED should show zero halo in this test
- Watch from your usual distance
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