HDR and OLED Screen Testing Guide

Start with two different questions

Does your setup support HDR, and can you distinguish the details in a picture? These are different questions. ScreenMotion Lab offers browser-reported capability clues and visual patterns for inspecting near-black steps, bright steps, gradients and motion. Treat the patterns as SDR checks of what you can see through your current browser and display settings, not as an HDR signal generator or a laboratory measurement.

Turning on an operating system's HDR setting does not convert an ordinary SDR pattern into a calibrated HDR test. The system may map SDR content into its HDR desktop output. A pattern can look brighter or different without containing HDR highlight information. Conversely, a useful SDR result does not establish how a display handles a genuine HDR movie or game.

Confirm the signal path first

For a separate HDR playback check, follow the display manufacturer's instructions for the chosen input, cable, operating system and playback application. Use content explicitly identified as HDR by its provider. Check any available display or player signal information. Keep a note of those settings rather than assuming that a vivid picture proves the correct signal is arriving.

The CSS dynamic-range media query reports capability, not a measurement of the current picture. The W3C specification explicitly distinguishes HDR capability from whether an HDR mode is active. A browser reporting support cannot certify this monitor, establish peak brightness or prove that this page is sending HDR pixels. A negative report also needs interpretation in the context of the browser and connected display.

Check black and near-black detail

Use a comfortable brightness and subdued room lighting, with reflections kept away from the screen. View from your usual seated position. Inspect the darkest steps and note which neighbouring shades remain distinguishable. A black patch and a faint grey patch merging together is an observation about this setup; it is not a measured contrast ratio.

If shadows disappear, compare the display's ordinary neutral picture mode with the current one. Check the manufacturer's guidance for black-level and signal-range options before changing them. A mismatch can hide dark detail or lift blacks, but so can picture processing. Change one setting at a time and restore it if the result worsens. Never use a forced all-black image as proof that an OLED has no defects.

Look for highlight clipping and banding

Inspect neighbouring bright steps at the same viewing distance. If they merge, note the setting and repeat after undoing aggressive contrast enhancement. On these SDR patterns, merged highlights describe the rendering of the SDR steps. They do not establish the clipping point, tone-mapping curve or peak luminance of an HDR signal.

A smooth gradient can reveal visible bands, but it cannot identify the cause by itself. The pattern, browser, output configuration and display processing all contribute to the picture. Compare the same pattern in another browser while holding display settings steady. A screenshot may help document a browser difference; it cannot record the physical brightness, reflections or your screen's black level.

A reproducible comparison you can run

This is an illustrative procedure, not a report of measurements from a tested device. Use the HDR checks page's near-black and near-white steps to compare settings on your own screen:

1. Record the browser, selected display input, picture mode, HDR setting and room lighting. Save your original settings so you can return to them.
2. Open the steps at normal browser zoom. Keep your seat and viewing distance unchanged. Briefly note which adjacent dark and bright steps you can separate.
3. If your system offers an HDR toggle, change only that setting and inspect the same SDR patterns again. Do not raise brightness merely to make a difference appear.
4. Record any change in visible separation, then restore the starting configuration and repeat. If the result cannot be repeated, describe it as uncertain.

For example, dark steps becoming easier to distinguish after a setting change suggests that the setting affects your SDR presentation. It does not demonstrate improved HDR accuracy. Keep that conclusion separate from any later comparison using genuine HDR playback.

OLED motion and safe next steps

Use the OLED motion patterns to compare moving edges, text and pacing. Keep pattern, speed and viewing distance consistent between runs. A trail or uneven movement is something to investigate, not an automatic diagnosis of panel response time: the browser's delivery of frames and the display's processing can both affect what you see.

Stop when you have enough information. Avoid leaving bright static patterns on an OLED, and keep its normal protection features enabled. Follow its manual for image retention or maintenance; do not repeatedly trigger cleaning cycles or use flashing patterns as a promised repair. If a mark persists in ordinary varied content, document it for the manufacturer instead of trying increasingly harsh tests.

For buying or warranty decisions, compare observations with the exact model's documentation. VESA's DisplayHDR programme defines performance requirements and lists certified models; this website does not award or verify that certification. For quantitative calibration, use suitable instruments and software, or seek a qualified calibration service.

FAQ

Does a positive browser HDR report mean this page displays real HDR?

No. A capability report and the content's signal format are separate. These SDR inspection patterns cannot establish that HDR output is active or measure how an HDR highlight is rendered.

Why do the same patterns change when I enable HDR?

Your system or display may present SDR content differently in that mode. Repeat with unchanged viewing conditions and restore the original setting. A visible difference alone is not evidence that either presentation is calibrated.

Can I measure brightness or contrast with these patterns?

No. You can describe visible separation and clipping, but numerical luminance or contrast measurements require appropriate equipment. Do not translate a visible step count into nits or a certified contrast ratio.

Does OLED motion testing check for burn-in?

Moving patterns are not a burn-in diagnosis. A persistent mark needs comparison across normal content and advice from the manufacturer. Avoid prolonged static tests, and do not assume a temporary change proves permanent damage.

What should I include when reporting an unexpected result?

Include the pattern, browser, display input, picture mode, relevant settings and steps to reproduce it. Separate browser-reported values from visual observations. Say whether the change repeats, and avoid claiming a physical measurement you did not make.

Sources

• VESA DisplayHDR: certification requirements and the certified-product directory.
• W3C Media Queries Level 5: dynamic-range: the capability query and its limits; a specification under development.
• MDN: dynamic-range media feature: syntax, interpretation and browser compatibility.

Open HDR checks   Open OLED & motion

Limit: ScreenMotion Lab cannot measure nits, color error, gamut volume or input lag without external instruments. For calibration-grade results, use a colorimeter or spectroradiometer with appropriate software.