Local dimming is a backlight technology that divides an LED-LCD display into independently-controlled zones, dimming or brightening each zone to improve contrast and black levels.
Local dimming is a technique used in LED-LCD (including QLED and Mini-LED) televisions to improve contrast. Because LCD panels rely on a backlight that's always on, dark areas of the image can look grey rather than black. Local dimming divides the backlight into zones that can be independently dimmed or brightened, so dark parts of the scene get a dimmed backlight (deeper blacks) while bright parts stay illuminated (bright highlights). The more zones, the more precise the effect.
**How local dimming works technically:** The TV's processor analyzes the image and adjusts the brightness of each backlight zone in real time. "Edge-lit" local dimming places LEDs along the screen edges with few zones (crude effect). "Full-array local dimming" (FALD) places LEDs behind the entire panel in a grid of dozens to hundreds of zones. Mini-LED takes this further with thousands of tiny LEDs enabling thousands of zones — approaching (but not matching) OLED's per-pixel control. The trade-off is "blooming": light bleeding from a bright object into an adjacent dark zone, visible as a halo.
**Why it matters to buyers:** Local dimming is the main way LCD TVs compete with OLED on contrast. A TV with many dimming zones (Mini-LED, 500+ zones) delivers deep blacks and bright highlights with minimal blooming; a TV with few zones (edge-lit, 8-16 zones) shows obvious haloing and worse contrast. When comparing LCD TVs, the number and type of dimming zones is one of the most important picture-quality specs.
**What to look for:** - Full-array local dimming (FALD) is far better than edge-lit - Mini-LED enables the most zones (thousands) — closest LCD gets to OLED contrast - More zones = less blooming around bright objects on dark backgrounds - OLED doesn't need local dimming (every pixel is its own light source) - Budget LCDs often have no local dimming at all (poor contrast)
Real-world 2026: Mini-LED TVs (Hisense U8, Samsung Neo QLED, TCL QM8) offer hundreds to thousands of zones for excellent contrast in bright rooms. For absolute black levels in a dim room, OLED still wins — but high-zone Mini-LED narrows the gap dramatically.