Black Screen
Display a full-screen black color. Useful for checking screen uniformity, dead pixels, backlight bleed, and color accuracy on black backgrounds.
Uses for black screen
Dead pixel detection: look for pixels that do not display black correctly.
Screen uniformity: check for uneven brightness or color patches.
Backlight bleed: especially visible on dark and solid color screens (LCD).
Color accuracy: compare how black looks versus reference images.
Testing guide
How to use a black screen test
A full black screen is useful for finding hot pixels, backlight bleed, IPS glow, OLED black uniformity issues, dust, and image retention. It is one of the fastest checks for dark-scene display problems.
Best for
- Finding bright stuck or hot pixels that remain visible on black.
- Checking LCD backlight bleed and dark-scene clouding.
- Testing OLED true black, image retention, and black uniformity.
How to run the test
- 1Clean the display and reduce room lighting so reflections do not hide problems.
- 2Launch fullscreen black and wait a few seconds for your eyes to adapt.
- 3Inspect the center, corners, and edges for bright dots, glow, patches, or retained UI shapes.
- 4Compare with gray and color tests if you need to identify the exact issue.
How to read the result
Bright single dots on black are usually hot pixels or stuck sub-pixels.
Large bright corners on LCD are often backlight bleed or IPS glow.
On OLED, visible ghost shapes can indicate temporary retention or burn-in risk.
Related tools and guides
Frequently asked questions
Why does my black screen look gray?
LCD displays use a backlight, so black may look gray in a dark room. OLED should look much closer to true black because pixels can switch off.
Can a black screen test find dead pixels?
It is better for hot or stuck pixels. Dead black pixels are usually easier to see on white or bright color screens.
Is black screen testing safe for OLED?
Yes. A black screen is generally low-risk for OLED because the pixels are off or near off. Avoid leaving bright static overlays visible for long periods.