Monitor Test: Dead Pixels, Backlight Bleed, Burn-in & Ghosting Check
Comprehensive monitor test suite: check for dead pixels, backlight bleed, IPS glow, OLED burn-in & motion ghosting. Free diagnostics for all screens.
Click the button above to enter fullscreen mode. Press ESC or click anywhere to exit.
Green Screen Test - Most Effective Sub-Pixel Diagnostic
A vibrant Pure Green (#00FF00) diagnostic tool. Green is the most crucial color for testing because the human eye is most sensitive to it (occupying 2/3rds of your retinal cones). This means even the tiniest "Dead" or "Dark" pixel is glaringly obvious against a green background. If you only run ONE color test, make it this one.
🟢 Why Green is the Most Important Test
The human eye has evolved to be most sensitive to green wavelengths. This makes green screen testing particularly effective because:
- • Defects are more visible against green than any other color
- • Stuck red/blue subpixels stand out clearly as magenta or colored dots
- • If you only have time for one color test, choose green
💡 When to Use Green Screen Test
The green screen test is ideal for:
- • Quick single-color defect detection
- • Finding stuck red/blue subpixels
- • Most effective single test for display quality
- • Checking corners for defects and backlight issues
🔗 Related Display Tests
Complete RGB Testing
Test all color channels
Test red and blue subpixels to complete your RGB color accuracy check.
More Display Tests
Comprehensive diagnostics
Full pixel testing with patterns and calibration tools.
A vibrant Pure Green (#00FF00) diagnostic tool. Green is the most crucial color for testing because the human eye is most sensitive to it (occupying 2/3rds of your retinal cones). This means even the tiniest "Dead" or "Dark" pixel is glaringly obvious against a green background. If you only run ONE color test, make it this one.
How to Use Color Palette & Display Tester
The "Quick Scan" Method
Press 'G'. Scan the screen in a "Z" pattern. • Black dots = Dead Green sub-pixels (or fully dead pixels). • Magenta/Purple dots = Stuck Red/Blue sub-pixels.
Checking for "Mura" (Clouding)
Green is excellent for spotting "Mura" – uneven panel patches that look like dirty stains. If your green screen looks "Blotchy", your panel construction is poor.
Calculator Features
Peak Eye Sensitivity
Leverages the 555nm wavelength peak of human vision for finding the smallest defects.
Chroma Key Ready
Can be used as a "Green Screen" background for video production/streaming keying.
Sub-Pixel Gap Check
Green sub-pixels are often physically larger (in PenTile displays). This test checks their alignment.
Complete Function List
- Max Sensitivity Diagnostic:
- Dead Green Pixel Finder:
- Chroma Key Background:
- Mura / Stain Detection:
- PenTile Matrix Check:
- Colorimeter Verification:
- Backlight Uniformity:
Common Calculations & Examples
Example 1: Why do Gamers care about Green?
Problem: You see a weird "grain" in your games.
Steps:
- Open Green Screen Test.
- Look closely at the screen texture.
- If you see a "Screen Door Effect" (faint black grid lines), your monitor has extensive gap space between pixels (common in low-PPI VR headsets and old 1080p monitors).
Explanation: Because we see green best, pixel gaps are most visible on green backgrounds.