Buying guide
QD-OLED vs WOLED explained
The real differences between Samsung Display's QD-OLED and LG Display's WOLED panels, including generations, tandem stacks, subpixel layouts, coatings, and how they behave in bright rooms.
Almost every OLED gaming monitor uses a panel from one of two makers. Samsung Display builds QD-OLED panels, and LG Display builds WOLED panels. The monitor brand then adds its own coating, electronics, firmware, and features. That is why two monitors with the same panel type can behave differently, and why we never assume identical performance just because the panel is shared.
How each one makes color
QD-OLED uses blue OLED emitters. Quantum dot layers convert some of that blue light into very pure red and green. Because there is no color filter and no white subpixel, QD-OLED produces very saturated colors, especially at high brightness.
WOLED uses white OLED emitters with color filters on top, plus an unfiltered white subpixel to boost brightness. The white subpixel helps brightness but can make bright colors look less saturated than QD-OLED at the same luminance.
Tandem panels
Both makers now stack multiple emissive layers in “tandem” designs, which raises brightness and efficiency and, according to the manufacturers, lifespan. LG Display's 4th-generation “Primary RGB Tandem” WOLED is used in monitors such as the ASUS PG27AQWP-W and LG 27GX790B-B. Samsung Display describes its newer QD-OLEDs as multi-layer tandem designs too. The practical result is higher measured brightness: TFTCentral recorded about 381 nits in SDR with Uniform Brightness on the tandem-WOLED PG27AQWP-W, far above earlier OLED monitors.
Subpixel layout and text
Windows ClearType and macOS font rendering assume LCD-style RGB stripes. OLED panels have historically used other arrangements:
| Panel | Typical layout | Effect on text |
|---|---|---|
| Earlier WOLED | RWBG | Visible color fringes on some text |
| Recent WOLED | RGWB | Noticeably improved, per TFTCentral |
| QD-OLED (up to 4th gen) | Triangular RGB | Fringes, reduced by newer squarer subpixels and higher pixel density |
| 5th-gen QD-OLED ultrawides | RGB stripe | Fringing largely gone, per TFTCentral's AW3426DW review |
Pixel density matters as much as layout. A 27-inch 4K QD-OLED at about 166 pixels per inch shows far less fringing than a 27-inch 1440p model at about 109.
Coatings and bright rooms
This is where the two types differ most in daily use.
- QD-OLED panels have no polarizer, so ambient light hitting the screen lifts the black level and can give a gray or purplish tint. New films such as ASUS's BlackShield and Dell's QuantumBlack reduce this; TFTCentral found BlackShield helps but still trails glossy WOLED.
- WOLED panels use a polarizer, so blacks stay deeper in a lit room. Most WOLED monitors use a matte anti-glare coating, which diffuses reflections but can look slightly grainy. Newer glossy options such as ASUS's TrueBlack coating give the deepest perceived blacks TFTCentral had measured, at the cost of mirror-like reflections.
Which should you choose?
- Dim room, vivid HDR, color-rich games: QD-OLED's saturation is hard to beat.
- Mixed lighting, deepest blacks during the day: WOLED, glossy if you control reflections, matte if you cannot.
- Lots of text work: a 4K QD-OLED, a recent RGWB WOLED, or a 5th-gen RGB-stripe ultrawide.
Either way, check the exact model's coating, warranty, and firmware notes rather than choosing by panel type alone.