Screen Test Tool Dead Pixel & Color Display Checker

What is Screen Testing?

Screen testing is a method for checking display quality that helps you discover dead pixels, stuck pixels, dark spots, and verify whether color display is functioning correctly.

How to Use the Screen Test Tool?

1. Select Test Mode: Click different colored test blocks to enter fullscreen testing
2. Auto Play: Click the "Auto Play" button, and the system will automatically switch colors every 3 seconds
3. Observe Carefully: In fullscreen mode, carefully check for abnormal pixels or uneven colors
4. Switch Colors: Click the screen to manually switch to the next test color
5. Exit Test: Press ESC to exit fullscreen mode

Test Items Explained

• Solid Color Tests: Red, green, blue, black, white, gray, yellow, cyan, magenta - for detecting dead pixels
• Gradient Test: Black to white gradient to check smooth color transitions
• Checkerboard Test: Black and white alternating pattern to check contrast and sharpness

Common Screen Issues

Dead Pixel: Completely dark pixel that doesn't light up, usually permanent pixel damage.

Stuck Pixel: Pixel that stays lit, possibly a stuck color channel, sometimes fixable with software.

Color Shift: Overall inaccurate screen colors, may require screen calibration or settings adjustment.

When Do You Need Screen Testing?

• When buying a new monitor or computer to check for defects
• Suspecting screen issues and confirming if repair is needed
• Before professional design work to ensure accurate color display
• When trading used monitors to verify screen quality

For more information about screen testing, see Wikipedia: Liquid Crystal Display