Step by step
- Dim the room lights and click Full screen on the tool above.
- Inspect the pure black screen for glowing edges (light bleed) or bright dots (stuck pixels).
- Press the arrow keys to cycle through black, white, red, green, and blue.
- Scan section by section: a dead pixel stays dark on every color, while a stuck pixel stays one bright color.
- Double-click, double-tap, or press Esc to exit.
At a glance
| What you see | Likely issue | Screen type |
|---|---|---|
| Uneven glow near edges on black | Backlight bleed | LCD / IPS / VA |
| Completely dark, zero glow | Normal OLED behavior | OLED / AMOLED |
| Dot stays dark on all colors | Dead pixel | OLED and LCD |
| Dot stays bright red, green, or blue | Stuck pixel | OLED and LCD |
Related questions
What should an OLED screen look like on a pure black test?
On an OLED or AMOLED display, black pixels switch off completely, so the screen should look totally dark with no backlight glow.
How do I tell a dead pixel from a stuck pixel?
Use the arrow keys in full screen to switch through black, white, red, green, and blue. A dead pixel stays dark on every color, whereas a stuck pixel stays lit in one bright color.
Why do I see gray or glowing corners on my LCD monitor?
LCD monitors keep their backlight on behind a black image, which can show as slight glow or light bleed near the edges, especially in a dark room.
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Updated November 14, 2026.