Local dimming is a backlight technique that divides an LCD screen into independently controlled zones, dimming the zones behind dark parts of the image and brightening the zones behind bright parts. It exists because a standard LCD panel cannot turn off individual pixels the way OLED can; the backlight normally shines through the whole panel at once, so without zone control, black areas next to bright ones look grey instead of black. Local dimming is the closest an LCD panel can get to OLED-style per-pixel contrast.
What changed in 2026
- Zone counts increased sharply at mid-range prices. Mini-LED backlights, which pack far more, far smaller LEDs than older designs, pushed dimming zone counts from the hundreds into the thousands even outside flagship models.
- Processing improved for the same zone count. Better dimming algorithms reduce blooming without simply adding more physical zones, so two panels with similar zone counts can now look noticeably different.
- Gaming monitors adopted local dimming more widely. Fast-response panels with real local dimming used to be rare; more 2026 gaming monitors now combine high refresh rates with a genuine dimming backlight rather than a flat, non-dimming one.
- Mini-LED backlights increasingly pair with quantum dot color layers, a combination covered in our explainer on quantum dot displays, bundling better contrast with wider color together.
How local dimming works
The backlight sits behind the LCD layer, split into a grid of independently controlled zones. Software analyzes each frame and dims the zones behind dark image areas while keeping zones behind bright areas lit, approximating the contrast of true per-pixel control. The more zones a panel has, and the finer the software's control over them, the closer the result gets to accurate contrast without visible artifacts.
Full-array vs edge-lit
| Type |
Zone layout |
Dimming quality |
Typical use |
| Edge-lit |
LEDs along the panel edges only |
Weak, coarse zones |
Budget TVs and monitors |
| Full-array standard |
LEDs spread behind the whole panel |
Moderate to good |
Mid-range TVs and monitors |
| Full-array Mini-LED |
Thousands of small LEDs behind the panel |
Strong, fine-grained |
Premium TVs and monitors |
The blooming tradeoff
Blooming, sometimes called haloing, is the glow visible around a bright object sitting on a dark background, like a white subtitle on a black letterboxed film. It happens because a zone lighting up a bright object also lights up the dark area around it within that same zone. Fewer, larger zones produce more visible blooming; more, smaller zones shrink the glow closer to invisible.
How many zones is enough
Zone count alone does not tell the whole story, since panel size and processing quality change what a given number looks like, but as a rough guide:
| Zone count |
What to expect |
| Under 100 |
Blooming is usually visible in high-contrast scenes |
| A few hundred |
Noticeably better, blooming still visible around small bright objects |
| A thousand or more |
Blooming shrinks to mostly unnoticeable in normal viewing |
Treat exact zone counts on a spec sheet as a starting point, not a guarantee; check reviews that show actual test footage before buying, since processing quality varies between brands at similar zone counts.
Local dimming vs OLED contrast
OLED and QLED-class Mini-LED panels solve the same contrast problem differently. OLED does not need local dimming because each pixel produces and controls its own light, so it can turn fully off for true black with zero blooming. Local dimming is LCD's approximation of that same goal, and even the best Mini-LED implementations still show some blooming that OLED avoids entirely, in exchange for higher sustained brightness than most OLED panels can manage.
Common mistakes
Assuming more zones always means a better picture. Processing quality and panel calibration can make a panel with fewer zones look better than a poorly tuned panel with more.
Judging local dimming from spec sheets alone. Manufacturers count zones differently; independent test footage is a more reliable comparison than the number on the box.
Expecting OLED-level blacks from any local dimming implementation. Even excellent Mini-LED dimming reduces blooming; it does not eliminate it the way per-pixel OLED illumination does.
FAQ
Does local dimming work on all LCD monitors?
No, only monitors specifically built with a zoned backlight and dimming software. Most basic LCD monitors have a single, non-dimming backlight.
Can local dimming be turned off?
Yes, most displays let you disable it in settings, which some people prefer for certain content like subtitle-heavy video where blooming is most visible.
Is local dimming the same as OLED contrast?
No. Local dimming approximates per-area contrast on an LCD panel; OLED achieves true per-pixel contrast because each pixel is its own light source.
Why do two monitors with the same zone count look different?
Dimming algorithm quality, panel base contrast, and calibration all affect the result, so zone count alone does not determine picture quality.
Where to go next