What does Local dimming mean?
Local dimming adjusts the light output of separate backlight regions in a compatible display. It can improve the relationship between bright and dark areas, but each zone may cover many image pixels.
Why it matters
The display must balance dark backgrounds, bright highlights and transitions as objects move. Too much illumination around a small object can create blooming, while aggressive dimming can hide detail. Implementation, zone layout, picture mode and viewing angle affect the result. A local-dimming control should be assessed with ordinary footage as well as a difficult dark test scene.
A practical example
White captions on a black background can light nearby regions and create a glow. A lower dimming option may change that glow but also alter blacks and highlights elsewhere, so keep captions readable and judge the whole programme rather than optimising one isolated frame.
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Related terminology: Live sports coverage, Local news programme.
For practical setup and troubleshooting, browse the journal or support guides.