Backlight Bleed Test
IPS and edge-lit LCDs often show glow near corners when displaying near-black fills. Reduce room lights, tilt the panel slightly, and compare pure black versus very dark gray. OLED should stay uniformly off — non-uniform reds may hint at maintenance pixels. This browser test shows reference fills only; perceived bleed depends on calibration and viewing angle.
Pure black
Near-black #030303
- For each stage, fullscreen and sit at your usual distance.
- Let your eyes adapt ~15–30 seconds in a dim room.
- Scan corners and bezels — bright halos versus true black baseline.
How to use
- Dim ambient lights and pause screen savers/power savers briefly.
- Fullscreen pure black (#000000); note halos creeping from bezels versus center patch.
- Repeat using the near-black swatch—the easier contrast exposes subtle diffuser variance.
FAQ
Is mild glow always a defect?
Thin panels prioritize thickness and cost; uniformity varies unit-to-unit—document before RMA timelines expire.
Introduction
Backlight Bleed Test contrasts pitch black versus lightly lifted blacks exactly where IPS haloing thrives. OLED owners should observe whether any region fails to electrically switch off uniformly.