Black Screen Fullscreen – Backlight Bleed Test, Stuck Pixels & OLED Power Saving
A fullscreen black screen is ideal for testing backlight bleed, detecting stuck pixels, reducing distractions, saving battery on OLED displays and creating a low-stimulation environment. Activate pure black (#000000) with one click.
How to use the black screen
- Open this page.
- Click Enter Fullscreen or press F11.
- In a dark room, check the edges and corners for light leakage.
- Press ESC to exit.
What is a black screen used for?
- Backlight bleed and uniformity test: reveals light leakage at the edges and corners (common on IPS and VA panels).
- Stuck pixel detection: bright or colored dots stand out clearly against pure black.
- Focus and visual rest mode: reduces emitted light for night use.
- OLED battery saving: true black turns pixels off.
- Dark environments: more comfortable than bright screens at night.
- Burn-in and stain check: useful for OLED and high-end monitors.
When to use the black screen
The black screen is the most important color for diagnosing light leakage and stuck pixels. Test in a dark room with brightness near maximum. Any bright or colored spot that should not be there indicates a stuck pixel. Combine with the automatic color cycle and the Stuck Pixel Fixer tool.
Frequently Asked Questions (FAQ)
Does the black screen help find defective pixels?
Yes. Stuck pixels appear as bright or colored dots on black. Dead pixels are invisible on black and show up on white.
How do I test backlight bleed with a black screen?
Activate the black screen fullscreen in a dark room and look at the edges and corners. Any glow or uneven brightness indicates backlight bleed.
Does a black screen save battery?
On OLED and AMOLED yes, because black pixels are off. On LCD the gain is small.
Does it work on phones and tablets?
Yes. It works in modern browsers on any device.