White Screen
Display a full-screen white color. Useful for checking screen uniformity, dead pixels, backlight bleed, and color accuracy on white backgrounds.
Uses for white screen
Dead pixel detection: look for pixels that do not display white 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 white looks versus reference images.
Testing guide
How to use a white screen test
A full white screen reveals dead pixels, dust, pressure marks, color tint, dirty screen effect, and brightness uniformity problems. It is the quickest bright-field test for a new display.
Best for
- Finding black dead pixels that do not light up on bright backgrounds.
- Checking yellow, pink, green, or blue tint across a panel.
- Spotting dirty screen effect, pressure marks, and uneven brightness.
How to run the test
- 1Clean the screen first so dust is not mistaken for pixel damage.
- 2Launch fullscreen white and inspect the panel from normal viewing distance.
- 3Look for black dots, dark smudges, tint shifts, or uneven corners.
- 4Compare with gray, red, green, and blue tests to isolate color-channel issues.
How to read the result
A black point visible on white may be a dead pixel, dust, or a mark on the panel surface.
A warm or cool tint can come from color temperature, night light settings, or panel uniformity.
Large uneven patches are usually better checked again with gray uniformity patterns.
Related tools and guides
Frequently asked questions
What is a white screen test useful for?
It is useful for finding dead pixels, dust, dirty screen effect, tint, and uneven brightness across the panel.
Why does white look yellow?
Common causes are warm color temperature, night light modes, blue light filters, aging backlights, or panel uniformity problems.
Should I use maximum brightness?
Use normal brightness first. Maximum brightness can reveal issues but may also exaggerate normal LCD uniformity limits.