HDR (High Dynamic Range) is a display standard that increases the range between the darkest and brightest parts of an image. SDR (Standard Dynamic Range) is limited to a peak brightness of around 100–200 nits with a contrast ratio of roughly 1000:1. HDR can achieve peak brightness of 400 to 10,000+ nits and contrast ratios of 1,000,000:1 or more on OLED panels. HDR also expands the color gamut beyond sRGB, typically covering P3 or BT.2020. The result is more lifelike highlights, deeper shadows, and more saturated colors. For HDR to be effective, the monitor, the operating system, and the content all need to support it simultaneously.

These are VESA DisplayHDR certification tiers. HDR400 requires a minimum peak brightness of 400 nits, 8-bit color depth, and a minimum contrast ratio — it is considered entry-level and is often criticized as "fake HDR" since the contrast ratio requirement is low. HDR600 requires 600 nits peak brightness and begins to show noticeable HDR benefits in well-lit scenes. HDR1000 requires 1000 nits peak brightness and represents a significant step up for highlight detail. HDR1400 and HDR1000 True Black are premium tiers for high-end local dimming panels. OLED displays are often certified separately under DisplayHDR True Black, which has stringent requirements for near-zero black levels.

To enable HDR in Windows 11: Open Settings → System → Display. Select your HDR-capable monitor if you have multiple displays. Toggle "Use HDR" to On. You can also enable Auto HDR, which automatically adds HDR to SDR games. For best results, also enable "HDR" or "HDR mode" in your monitor's OSD (on-screen display). In some cases, you may need to set your display to 10-bit color in Windows display settings. Note that enabling HDR in Windows can make SDR content (like desktop applications and web browsers) appear washed out unless the monitor or Windows applies tone mapping. Windows 11 includes SDR brightness adjustment to help compensate.

SDR content is mastered to a peak of 100 nits (white point) using the sRGB or Rec.709 color space. HDR content is mastered at 1000, 4000, or 10,000 nits using the PQ (Perceptual Quantizer, SMPTE ST 2084) or HLG (Hybrid Log-Gamma) transfer function, with a DCI-P3 or BT.2020 color gamut. When displaying SDR content on an HDR-capable monitor in HDR mode, the monitor or OS applies tone mapping to scale the SDR content into the HDR range. This can cause desktop UI and web content to appear slightly dim compared to native SDR mode. True HDR content (HDR movies, HDR games) must be authored and delivered with HDR metadata to take full advantage of an HDR display.

For genuine HDR gaming, look for: peak brightness of 600+ nits (1000+ nits is better), full-array local dimming (FALD) with many zones (400+) or OLED/MiniLED technology for per-pixel dimming. Color gamut coverage of at least 90% DCI-P3. A 10-bit color panel (native or FRC). DisplayHDR 600 or higher certification. For gaming-focused HDR, also consider refresh rate (144Hz+ for smooth gaming), response time (for motion clarity), and G-Sync Ultimate or FreeSync Premium Pro for VRR with HDR support. OLED gaming monitors (LG UltraGear, ASUS ROG Swift OLED) currently offer the best HDR performance due to infinite contrast ratios and per-pixel brightness control.

Color gamut is the range of colors a display can reproduce. sRGB/Rec.709 covers about 33% of the visible color space and is the standard for most web content and SDR video. DCI-P3 covers about 45% and is used for cinema and most HDR content. Rec.2020 (BT.2020) covers about 76% and is the theoretical maximum for current HDR standards. Most current "HDR" monitors cover 90–100% DCI-P3. True Rec.2020 coverage is rare and mostly found in professional reference monitors. A wider gamut allows more saturated, vivid colors. For HDR gaming and streaming, a monitor covering 95%+ DCI-P3 provides a good experience, though true Rec.2020 is not required since most content is mastered to P3.