OLED Near-Black Test
OLED panels excel at true black, but transitioning out of pitch black (digital levels 0–32) can expose black crush, macro-blocking, or color tinting. Offers Patch Grid, Full Field, Step Ramp, and Dark Room modes.
Technical Scope & Limitations
Subjective visual inspection. Does not measure physical candela/m² (nits). Ambient room reflections strongly influence near-black visibility.
Browser rendering output can be influenced by OS display scaling, GPU driver color settings, and active HDR profiles.
- Perform this test in a dark or dimly lit room for optimal near-black perception.
- Allow your eyes 1–2 minutes to adjust to the darkness.
- Cycle between Patch Grid, Step Ramp, and individual Full Field levels (0 to 32).
- Look for black crush (where steps 1–4 are completely invisible), raised black glow, or non-neutral greenish/magenta color tints.
What This Test Checks
- Digital luminance transition immediately above pure pitch black (levels 0 to 32 out of 255).
- Black crush where lowest shadow details (levels 1 to 4) are completely invisible.
- Raised black floor where level 0 emits noticeable gray light.
- Color tinting (magenta or green shifts) in near-black gradients.
How to Perform the Test
- Dim your room lights completely for optimal visual eye adaptation.
- Toggle between Patch Grid and Step Ramp.
- Identify whether digital steps 1, 2, 3, and 4 are faintly distinguishable from pitch black level 0.
- Toggle Dark Room mode to dim on-screen controls and eliminate glare.
What to Look For
- If levels 1–4 are completely indistinguishable from black, your gamma or video range is crushing dark shadows.
- If level 0 glows with visible backlight or subpixel emission, check HDMI Black Level / Video Range matching.
Common Display Problems & Diagnostic Guidance
RGB Range Mismatch (Full vs Limited)
If your PC sends Full RGB (0–255) but your OLED TV expects Limited RGB (16–235), levels 0–15 will be crushed into absolute black.
Frequently Asked Questions
Why are near-black levels tricky for OLED displays?
Self-emissive subpixels require precise small electrical currents to turn on just slightly above zero. Minor variations in thin-film transistor (TFT) backplanes can cause stepped jumps or unevenness out of black.