These are the two most-searched OLED TVs of 2025, and they use fundamentally different panel technologies. The LG C5 runs WOLED with an MLA (Micro Lens Array) layer — LG Display's mature organic panel with a white sub-pixel that boosts brightness efficiency. The Samsung S90D uses QD-OLED: a quantum-dot conversion layer over a blue OLED backplane from SDC. Both deliver true per-pixel black levels and infinite native contrast. They diverge sharply on peak brightness, color volume, reflectivity, and HDR format support. At 65", the S90D typically runs about $200 cheaper.

Specs Comparison

Panel Technology: WOLED vs QD-OLED

LG's C5 uses a fifth-generation WOLED panel with MLA — Micro Lens Array — a film of microscopic lenses over each pixel that redirects internally reflected light forward. Measured peak brightness on a 10% HDR window sits around 1,000 nits; the 100% full-field white measures approximately 200 nits, where OLED's ABL (automatic brightness limiting) kicks in to protect organic compounds. Native contrast is effectively infinite because each OLED pixel switches fully off for black.

Samsung's S90D is built on SDC's third-generation QD-OLED substrate. The quantum-dot conversion layer produces exceptionally saturated color — DCI-P3 color volume consistently measures above 95% on the S90D versus around 85-88% for LG's WOLED. Peak brightness on a 10% window reaches approximately 1,300-1,400 nits, a meaningful advantage in windowed HDR highlights like sun glare, neon signs, or explosions against dark backgrounds.

Where the C5 recovers is real-world room performance. WOLED's semi-gloss finish handles ambient light significantly better than QD-OLED's fully glossy surface, which can produce distracting mirror-like reflections in living rooms with windows or overhead fixtures. The C5's anti-reflection advantage is real and daily-life relevant in most homes.

HDR Formats and Processor

The LG C5 supports Dolby Vision, HDR10, HDR10+, and HLG — the full quartet. Dolby Vision IQ, LG's ambient-light-adaptive variant, adjusts peak brightness, tone mapping, and color temperature in real time using a multi-zone light sensor. The Alpha 11 Gen 2 processor handles AI upscaling, noise reduction, and AI Picture Pro mode that adapts enhancement based on detected content type.

Samsung's S90D supports HDR10, HDR10+, and HLG — no Dolby Vision. This is a persistent Samsung policy, not a hardware limitation. HDR10+ Adaptive with ambient-light adjustment is Samsung's answer, and it's capable, but the Dolby Vision content library is larger: Netflix, Apple TV+, Disney+, and virtually all 4K UHD Blu-rays produce Dolby Vision masters. On the S90D, those fall back to HDR10, which is good but not dynamically tone-mapped the way Dolby Vision is.

Samsung's NQ AI Gen 2 processor manages the QD-OLED panel's ABL curves and drives Tizen OS 8.0's content discovery. LG's Alpha 11 Gen 2 on webOS 24 is marginally cleaner in UI responsiveness, but both processors are competitive for 4K content and upscaling.

Gaming: VRR, Input Lag, HDMI 2.1

Both TVs are exceptional gaming displays. The C5 offers four HDMI 2.1 ports all running full 48Gbps bandwidth at 4K/120Hz. VRR spans 40-120Hz via FreeSync Premium Pro and NVIDIA G-Sync Compatible. Measured input lag at 4K/120Hz is approximately 1.2ms — imperceptible. ALLM automatically switches to game mode when a console is detected.

The S90D also provides four HDMI 2.1 ports with 4K/120Hz, VRR from 48-120Hz (FreeSync Premium Pro, G-Sync Compatible), and input lag around 1.1ms. Samsung's Gaming Hub offers direct access to Xbox Cloud Gaming, GeForce Now, and Steam Link — useful if you want cloud gaming without a console plugged in.

The C5's 40Hz VRR floor versus the S90D's 48Hz is meaningful for games that dip below 48fps — RPGs and open-world titles in quality mode can hover in the 40-50fps range where the C5 maintains smooth VRR and the S90D drops out of variable refresh territory.

Audio, Build, and Pricing

LG's C5 ships with a 60W 2.2-channel system with AI Sound Pro upmixing. It's adequate for dialogue but most buyers at this tier add a soundbar. The C5 includes a stand and retails at approximately $1,699-1,799 for 65". At 55", the C5 runs around $1,199-1,299.

Samsung's S90D ships with a 60W 4.2-channel system at 65" and larger — the extra channels give marginally wider sound spread from TV speakers. Samsung's optional One Connect box routes all cables to a separate brick rather than the TV panel, which reduces rear-panel cable clutter on wall-mounted installs. The 65" S90D retails around $1,499-1,599, making it approximately $200 cheaper than the C5 at this size.

Over the full 2025 lineup, the S90D often drops further during sales events — $1,299-1,349 for 65" was observed at Best Buy during Black Friday 2025. At that price the QD-OLED brightness and color volume advantages become harder to ignore.

Which Should You Buy

If your room has ambient light from windows, overhead fixtures, or lamps during typical viewing hours, buy the C5. WOLED's anti-reflection and Dolby Vision IQ combination is the better daily-use picture in real homes. The majority of premium streaming content is Dolby Vision mastered, and the C5 plays it correctly.

If you watch primarily in a dark or controlled room — dedicated home theater, basement, bedroom — and care about HDR punch and color saturation, the S90D's QD-OLED delivers more visual drama on bright highlights and more saturated color. The glossy surface is less of a problem in darkness.

Both TVs have identical OLED fundamentals — black levels, per-pixel precision, 180-degree viewing angles, and sub-2ms gaming response. The choice is almost entirely about room brightness, Dolby Vision content habits, and whether you value peak highlight impact or reliable real-world performance.

Best For

• LG C5 OLED Bright living rooms, Dolby Vision streamers, and multi-source gamers who want the best all-conditions picture
• Samsung S90D Dark-room cinephiles and gamers who prioritize maximum peak brightness and color saturation

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