What HDR is on a monitor

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Is HDR worth turning on for games? HDR makes bright parts brighter and dark parts darker, so highlights pop. A logo that only says HDR means the panel can accept that signal. It is not a measurement of the peak, and it does not, by itself, make the black deeper.

I play on a 1080p 240 Hz and a 1440p 155 Hz monitor, driven by an RTX 5080. For full picks, see the best gaming monitors. HDR is about the brightness of the picture after those three are chosen. Variable refresh decides when the next picture starts. It does not make a highlight brighter. More monitor guides.

Panels worth a look

• DisplayHDR 400, 27” 1440p IPS: LG UltraGear 27GR83Q-B. Official: 2560×1440 IPS, 1 ms (GtG) with 240 Hz, DCI-P3 95% (typ.), VESA DisplayHDR 400, G-SYNC Compatible, FreeSync Premium, HDMI 2.1 ×2, DisplayPort. LG US page. Amazon search for 27GR83Q-B
• DisplayHDR True Black 400, 27” 1440p OLED: LG 27GS93QE-B. Official: 27” OLED, 1440p, 240 Hz, 0.03 ms, DisplayHDR True Black 400. That badge is the emissive test, not a brighter LCD backlight. LG US page. Amazon search for 27GS93QE-B
• DisplayHDR 1000, 32” 4K IPS: LG UltraGear 32GQ950-B. Official US: 32” UHD (3840×2160) Nano IPS, VESA DisplayHDR 1000 with DCI-P3 98% (typ.), 1 ms (GtG), 144 Hz (overclock 160 Hz), G-SYNC Compatible, FreeSync Premium Pro, HDMI 2.1. LG US page. Amazon search for 32GQ950-B

The short version: a logo means the signal is accepted. The peak, the full-screen number, and the dimming are the listing.

What to check first

HDR is a wider span from dark to bright, and a signal that says how bright each part should be. A logo means the monitor can accept the signal. It is not a nit count.

What you seeIt already looks rightFlat or grayBright areas bloom into the darksWhere you lookedThe Windows desktopA gameThe listingThe word HDR onlyA peak in nits, and a dimming note

What this means

Leave it

The picture already has the range you can see. HDR is not a sharper desktop, and it does not add frames.

If the picture already looks right, the badge is not a problem you have. Judge this in a game that has its own switch, not on the desktop icons.

What the signal is asking for

A normal desktop picture is graded for a limited range. Windows, text, and most older games live there. HDR content is graded so a bright explosion may be far brighter than a face, while a shadow beside it stays dark. The signal carries that instruction. The panel then has to be able to follow it.

The common version of that signal is HDR10. The Consumer Technology Association’s video-technology definitions name the HDR10 Media Profile as SMPTE ST 2084 for the brightness curve, 10-bit color, ITU-R BT.2020 primaries, and static metadata: SMPTE ST 2086, MaxFALL, and MaxCLL. Compressed video in that profile uses 4:2:0. CTA-861.3 is the HDMI InfoFrame that carries those static numbers. The brightness limit in basic HDR10 is one set of numbers for the whole piece, not a new set every scene. Other format names send a fresher limit as the scene changes. A game that says HDR and does not name a second format is usually HDR10.

VESA’s DisplayHDR home page says every DisplayHDR and DisplayHDR True Black tier has to support HDR10. The format does not raise the panel’s peak. The signal can ask for a highlight the backlight cannot reach, and that highlight flattens. The flat spot is the panel at its maximum, not a driver you forgot.

Microsoft’s HDR settings page is looking for this same pair when Windows reports that a display supports HDR: an HDR10-capable panel and a PC that can send the wide-color signal. In DirectX Diagnostic Tool that shows up as AdvancedColorSupported, plus monitor capabilities that name HDR, BT.2020, and EOTF 2084. Those flags mean the path exists. They are not a nit measurement.

What the number on the badge means

VESA’s DisplayHDR badge is a lab pass. The number is a minimum peak in nits, and a nit is one candela per square meter. VESA’s CTS 1.2 table, released 7 May 2024, is the sheet I will stick to. DisplayHDR 400 means at least 400 nits on the 8 percent center-patch test with a 2 percent average-picture-level background. DisplayHDR 600 and DisplayHDR 1000 are 600 and 1000 nits on that same kind of test. The long test of the whole screen is lower. On the 400 tier, VESA’s full-screen duration floor is 320 nits, not 400. On the 1000 tier it is 600. The 32GQ950-B’s DisplayHDR 1000 badge is that 1000-nit patch floor, not a promise that a white desktop stays at 1000. The badge doesn’t guarantee that every pixel stays at the printed number while you read a page.

The same published table sets a black. DisplayHDR 400 allows a black as high as 0.4 nits in the dual-corner test. The 600 tier’s published black is 0.1, and 1000 is 0.05. True Black is a different badge, aimed at OLED and other emissive panels. Its published black is 0.0005 nits, which is a panel that can go dark in a way one shared backlight usually cannot. The 27GS93QE-B’s True Black 400 line is that test. A higher number is a harder test. It is not a rank of your room, and a monitor with no badge can still be bright. The badge is only the test someone paid to run.

VESA also prints color. DisplayHDR 400 asks for 90 percent DCI-P3 on the color-patch test. 500 and above ask for 95 percent. Every tier asks for a 10-bit video signal per channel. Those are lab floors. LG’s 27GR83Q-B prints DCI-P3 95 percent typical next to DisplayHDR 400. The 32GQ950-B prints 98 percent typical next to DisplayHDR 1000. The percentage on the maker page is that maker’s typical coverage. It is not a second VESA badge.

VESA’s own warning is the one the other reviews keep repeating: if a listing says HDR-400 instead of DisplayHDR 400, or claims HDR with no DisplayHDR performance specification, it is likely that the product did not sit the certification. You can check the current certified list on displayhdr.org. A maker’s own “HDR” word, with no certificate, is only a claim that the signal is accepted.

Dimming is the other half

One backlight lights the whole panel. Turn it up for a highlight and the darks come up with it. Zones split that light, so a bright corner can be high while another region stays down. More zones shrink the bloom. The listing has to say whether dimming is the whole screen or zones.

CTS 1.2 made that split a pass-or-fail line. VESA’s overview says the new static-contrast test requires 1D local dimming or better for DisplayHDR 500 and 600, and 2D local dimming or better for DisplayHDR 1000 and above. DisplayHDR 400 can pass with a higher native contrast or with 1D dimming. 2D is a grid across the back. 1D is closer to a strip. Mini-LED is the backlight that gets you many small 2D zones. OLED skips the backlight and turns the pixel off, which is why True Black exists as a separate badge.

A zone is still larger than a pixel. A small bright mark on black can light every pixel that shares the zone. That halo is the Mini-LED page’s problem, not a missing driver. OLED removes the zone and introduces burn-in as the other question. Neither page is a reason to skip resolution, size, and refresh.

“HDR 400” printed by the maker, with no VESA name, is not the same sentence as a DisplayHDR 400 certificate. Read which one it is. Then read whether dimming is the whole screen or zones. A 400 badge on an IPS with one backlight, the way a lot of 27-inch 1440p gaming lists read, is a signal pass plus a 400-nit patch floor. It is not a 1000-nit 2D array.

Where you turn it on

The monitor has to be in a mode that accepts the signal. Some menus ship with that mode off, or hide it inside a picture preset. Microsoft’s HDR settings page says to check the display’s own on-screen menu first, because the path varies by make and model.

Then Windows: Settings, System, Display. If you have more than one screen, select the one you are judging, and turn HDR on. Microsoft puts Auto HDR in that same section. Auto HDR lifts older DirectX 11 and DirectX 12 games that were graded for the normal range. It is an estimate Windows makes. It is not the grade the game shipped with. A game that has its own HDR control is the picture to trust. Turn that on, then look at the game, not the icons.

The desktop can look flat once the Windows switch is on, because the icons were not graded for the wider range. Windows maps them into it. Microsoft’s HDR settings page says SDR content and apps can appear too bright or too dark, and that the SDR content brightness slider (or HDR content brightness on a built-in panel) is the balance while the switch stays on. If you only wanted the game, judge the game, then turn the Windows switch off for the hours you spend on the desktop. On a laptop, Microsoft says the maker may turn HDR off on battery and bring it back on the charger. A picture that changes when you unplug is that power rule. I used to sit in front of a Razer Blade 15.

Windows 11 also ships a Windows HDR Calibration app in the Microsoft Store. Microsoft says it uses three test patterns recommended by the HDR Gaming Interest Group: the darkest visible detail, the brightest visible detail, and the display’s maximum brightness. Run it full screen, on the HDR-capable display, with HDR already on. Microsoft also says post-processing in the monitor menu can fight the app.

Duplicated displays are the other Windows trap. Microsoft says HDR is not supported when a laptop is set to duplicate the desktop onto an external HDR screen. Extend the displays, then judge the external panel.

The cable still has to carry it. A high refresh rate at the resolution you play can exist on one port and not the other, and the HDR signal rides that same cable. The 27GR83Q-B names HDMI 2.1 and DisplayPort. The 32GQ950-B names HDMI 2.1 for 4K at 144 Hz. If Windows is on and the game never offers a switch, the path is incomplete. Another control panel will not create a peak the listing never printed.

What HDR does not change

It does not add frames. A brighter highlight is the same frame with a different instruction for those pixels. If the frame rate falls when you enable it, the card or the game is doing more work. The monitor did not take the frames, and it will not return them.

It does not make a pixel change shade faster. A trail behind a dark object is response time. Brightness did not finish it.

It does not turn a shared backlight into an off pixel. A deeper black that comes from how the panel blocks the light is still that panel, not this signal. A screen that can switch a single pixel off can go darker than a backlight that only dims, which is what the True Black test is aimed at. The letters alone have not bought that screen.

It does not sharpen text, and it does not add pixels. A 1080p panel with a real peak is still 1080p. If the thing you wanted was a higher pixel count, or a refresh rate the PC can hold, HDR is the wrong fix. FPS monitor notes is the refresh and resolution page after the brightness question is settled.

A monitor that is already bright enough, with darks that stay dark beside a highlight, does not improve because a badge is switched on. The useful case is a game that sends the wider range, and a listing that names the peak, the full-screen number, and the dimming. I chose a 1080p 240 Hz and a 1440p 155 Hz monitor for speed and sharpness, not because I have a DisplayHDR mode I can name. More monitor guides.

Common questions

What is HDR on a monitor?

HDR (high dynamic range) lets a monitor show brighter highlights and deeper shadows in the same image. The HDR logo means it accepts an HDR signal, not that it's very bright.

What is HDR10?

HDR10 is the most common HDR format. It uses 10-bit color, a wide color range and static metadata that tells the display how bright the content should be.

Does HDR make a monitor sharper?

No. Sharpness comes from resolution, so HDR improves brightness and contrast but won't make text or details crisper.

Is an HDR monitor the same as DisplayHDR 400?

No. DisplayHDR 400 is a VESA certification with real brightness tests. A monitor that just says 'HDR' or 'HDR-400' without the certificate hasn't passed that test.

What is DisplayHDR 1000?

It's a high VESA HDR certification that requires 1000 nits in a small highlight, 600 nits full-screen and local dimming. It's a big step up from DisplayHDR 400.

Why does Windows look washed out with HDR on?

Regular desktop content is mapped into the HDR signal, so it can look flat or gray. Adjust the SDR content brightness slider in Windows HDR settings, and judge HDR in games that support it.

How do I turn on HDR in Windows?

Go to Settings, System, Display, select your monitor and turn on Use HDR. You can also turn on Auto HDR there to add HDR to older DirectX 11 and 12 games.

Does HDR increase FPS?

No. HDR doesn't add frames, and it can cost a small amount of performance in some games.

What should I look for in an HDR monitor?

Check the peak brightness in nits, the local dimming type and a real DisplayHDR or True Black certification. Also make sure your port and cable support HDR at the resolution and refresh rate you want.