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.
Real-world content examples
HDR movie watching reveals the gap: a dark space scene with distant starfield shows infinite blacks on the C4 but visible halo around stars on the QN90D. However, a sports broadcast with stadium lighting shows the QN90D's advantage — the high brightness makes the action pop even in bright living rooms where an OLED looks washed out.
For streaming platforms, the C4's higher color volume (99% vs 95% DCI-P3) is most visible in Netflix/Disney+ HDR content with extended color gamuts. SDR content (YouTube, TikTok, most cable) is indistinguishable between both.
Viewing angle and family use
OLED's superior off-angle performance matters if your family sits at 30+ degrees from center. The C4 maintains good color and contrast at wide angles; the QN90D shows brightness loss and slight color shift above 20 degrees. For family viewing with viewers on both sides of the sofa, OLED is the better choice.
Response time and motion
Both TVs have native 120 Hz with motion interpolation (TruMotion on LG, MotionXcelerator on Samsung). The C4's per-pixel refresh allows cleaner 24p film playback — no soap-opera effect artifacts when disabled. The QN90D's local dimming flicker is occasionally visible during fast pans on sports.