The LG C4 OLED and Samsung QN90D Neo QLED represent the two dominant premium TV technologies in 2026. They cost similar money ($1,500-2,500 for 65-77" range), they both score in the top tier of our TV leaderboard, and they're the two TVs most picture-quality-focused buyers cross-shop. They're also fundamentally different products — OLED's per-pixel blacks vs Mini-LED's eye-searing brightness — and the better choice depends almost entirely on your viewing environment.
We installed both side-by-side on the same media wall for four weeks of mixed content viewing (movies, sports, gaming, daily TV). LG C4 OLED, Samsung QN90D, and the head-to-head comparison page.
The room matters more than the tech
If you have a dedicated theater room or you watch primarily at night with curtains, get an OLED. Stop reading.
If you watch in a bright living room with south-facing windows, get a Mini-LED. Stop reading.
The rest of this review is for buyers in mixed lighting — most people, most living rooms.
Brightness in numbers
| Metric | LG C4 OLED | Samsung QN90D |
|---|
| Peak HDR (10% window) | 1,000 nits | 2,400 nits |
| Sustained full-screen | 220 nits | 700 nits |
| Color volume (DCI-P3) | 99% | 95% |
The QN90D is over twice as bright. In a bright room with sun on the screen, the QN90D's HDR highlights (sun on water, bright clouds, neon) genuinely pop where the C4 looks dim. The C4 also has a glossy panel that reflects ambient light directly back at you; the QN90D's anti-glare coating diffuses reflection at the cost of slightly softer apparent sharpness.
For a dark room, both clear the threshold where additional brightness stops adding to image quality. The QN90D's brightness becomes wasted; the C4's per-pixel blacks become the visible advantage.
Black level and contrast
The C4's per-pixel OLED control means individual pixels can be completely off — true black, infinite contrast within a single frame. When you're watching a dark movie with bright highlights, the contrast pops in a way that no Mini-LED can match. There is no halo around bright objects. There is no blooming. The black is the same black as the bezel.
The QN90D has ~1,300 local dimming zones. Bright objects on dark backgrounds show a visible halo (4-6 cm). In test patterns this is obvious; in real content (movies, sports, gaming) it's far less noticeable because the high overall brightness makes the halo less perceptually offensive and your eye adapts.
OLED's per-pixel advantage is unambiguously real. The question is whether you'll notice it in your typical content and viewing conditions.
Color accuracy
Both calibrated tightly out of the box in Filmmaker/Movie mode (Delta E < 3 on average). The C4's color volume is slightly higher (99% DCI-P3 vs 95%), which matters most in HDR-mastered content with extended color gamut. For SDR streaming, both look essentially identical after calibration.
For color-critical work (photo editing, video grading), neither is a substitute for a proper professional monitor, but both are accurate enough to evaluate work that will eventually display on consumer TVs.
Gaming credentials
| Spec | C4 OLED | QN90D |
|---|
| Native refresh | 144 Hz | 144 Hz |
| VRR | G-Sync + FreeSync | FreeSync Premium Pro |
| Input lag (Game Mode) | 9.0 ms | 9.8 ms |
| HDMI 2.1 ports | 4 | 4 |
| ALLM | Yes | Yes |
Functionally tied for console gaming. Both excellent. For PC gaming, the C4 has a slight edge with G-Sync ULMB-class motion clarity at 120+ Hz. For HDR gaming, the QN90D's brightness gives more impact to lit highlights.
The C4's OLED panel has a small risk of burn-in if you play games with persistent HUD elements (CS2 minimap, MMO UIs) for many hours per day. LG includes pixel-shift, automatic logo dimming, and a 5-year panel warranty. For typical mixed-use gaming (different games, varying content), burn-in is not a practical concern.
LG webOS: clean UI, fast app launches (1.2s avg), all major streaming apps, AppleCare-style platform updates for 5+ years. The Magic Remote with point-and-click is genuinely useful and the best TV remote experience.
Samsung Tizen: also clean, also fast (1.5s avg), all major streaming. Tizen pushes Samsung TV Plus (free ad-supported channels) more aggressively in the UI. The standard slim remote works but lacks Magic Remote's point-and-click; the premium SolarCell remote (sold separately or included on some models) is solar-charging and beautiful.
Both run Xbox Cloud Gaming and GeForce NOW natively without a console. Both support Apple AirPlay 2.
Sound
Both have anemic built-in audio. C4: 2.2-channel 40W. QN90D: 4.2.2-channel 60W with Object Tracking Sound+ (uses screen positioning for directional audio). The QN90D sounds noticeably better than the C4 unboosted — wider soundstage, more bass presence, more directional. Neither replaces a soundbar.
Plan to spend $400-1,000 on dedicated audio with either TV.
Lifespan and burn-in
OLED panels have a lifespan rating that's effectively practical — LG quotes 100,000 hours to half-brightness on the C4. At 8 hours/day that's 30+ years. For most owners, OLED lifespan is not a practical concern.
Burn-in is the more relevant OLED concern. After 1,000+ hours of identical persistent UI elements (news ticker, persistent game HUD), faint image retention may appear. LG's panel-care features (pixel shift, logo dim, screen refresh cycle) significantly reduce risk. For typical mixed content viewing, burn-in is not a practical issue.
Mini-LED has no burn-in risk. Backlight LED degradation over 10+ years can reduce peak brightness slightly but typically not perceptibly.
Price reality
LG C4 OLED 65": $1,599 retail, $1,299-1,499 on sale. 77": $2,799 retail, $2,299-2,599 on sale.
Samsung QN90D 65": $1,699 retail, $1,399-1,599 on sale. 75": $2,399 retail, $1,899-2,199 on sale.
Very similar pricing. Samsung holds price slightly better; LG discounts more aggressively at major sales events.
Verdict by buyer type
Get the LG C4 OLED if: your viewing room is dim or fully light-controlled, you watch lots of movies (especially HDR), you game on PC and value G-Sync motion clarity, your watching style is varied content (low burn-in risk), or you want the absolute best picture-quality TV at this price.
Get the Samsung QN90D Neo QLED if: your viewing room has any meaningful daylight, you watch lots of sports (Mini-LED brightness helps with bright stadium lighting), you have persistent game HUDs you spend hours in daily (burn-in concern), you want the better built-in audio system, or you have small children who throw things at the screen (OLEDs are slightly more fragile).
Neither is the universally "correct" TV — picture-quality buyers in dim rooms should choose OLED; brightness-and-room-light-tolerance buyers should choose Mini-LED.