Blue Screen - Fullscreen Blue Display Test
Open a fullscreen blue screen to check blue subpixels, color tint, dust-like marks and panel uniformity.
Quick answer
A fullscreen blue screen helps reveal blue subpixel issues, color tint, visible marks and panel uniformity problems.
Method: ScreenTestKit generates the test surface in your browser. Results depend on visual inspection; the site does not read or diagnose physical panel hardware.
How to use this test
- Open the blue screen fullscreen at normal brightness.
- Look for fixed dark or bright dots.
- Compare the same location on red, green and white screens.
- Use the full dead pixel test if a mark stays fixed.
What to watch for
- Blue areas that look purple, gray or uneven.
- Fixed dark points or bright points.
- Edge tint that changes with viewing angle.
- Dust or smudges that move after cleaning.
How to interpret results
Visible on blue only
The issue may involve blue subpixel behavior or color rendering.
Visible on all colors
Treat it as a general pixel or surface mark and repeat after cleaning.
Large uneven area
Use the screen uniformity and monitor color tests for a broader check.
Frequently asked questions
Is this a system error blue screen?
No. It is only a fullscreen blue display test page.
Why test blue separately?
Some subpixel and color-channel issues are easier to see on one primary color.