LCD Screen Tester
Test your monitor for dead pixels, color accuracy, and display quality. Run comprehensive screen tests in fullscreen mode.
Select a Test
Dead Pixel Test
Display solid colors to detect dead or stuck pixels on your screen.
Gradient Test
Check color uniformity and banding issues with smooth gradients.
Gray Scale Test
Test grayscale rendering and contrast levels.
Pattern Test
Detect pixel alignment and sharpness issues.
Color Test
Evaluate color accuracy and display calibration.
Motion Test
Check for ghosting and response time issues.
Text Clarity Test
Verify text rendering and font clarity.
Press ESC or click to exit. Press Space or Arrow keys to navigate.
Instructions
- Click any test button to start fullscreen test
- Press ESC or click anywhere to exit test
- Use Arrow keys or Space to switch between colors/tests
- Clean your screen before testing for accurate results
- Test in a dimly lit room for best visibility
What to Look For
Dead Pixels
Small dots that don't change color. Visible as black spots on bright colors or bright spots on black.
Stuck Pixels
Pixels that stay one color. Usually visible as bright colored dots (red, green, or blue) that don't change.
Color Banding
Visible steps or bands in gradients instead of smooth transitions. Indicates limited color depth.
Backlight Bleed
Light leaking around edges or corners, especially visible on black screens in dark rooms.
Screen Panel Types
| Panel Type | Color Accuracy | Response Time | Viewing Angles | Best For |
|---|---|---|---|---|
| IPS | Excellent | Good | Excellent | Professional work, photo editing |
| VA | Very Good | Average | Good | Movies, high contrast content |
| TN | Average | Excellent | Poor | Competitive gaming |
| OLED | Excellent | Excellent | Excellent | Premium displays, HDR content |
Frequently Asked Questions
Can dead pixels be fixed?
Dead pixels are usually permanent. However, stuck pixels can sometimes be fixed by running pixel-cycling software or gently massaging the affected area with a soft cloth.
How many dead pixels are acceptable?
Most manufacturers allow 1-5 dead pixels depending on screen class. Premium 'zero dead pixel' warranties are available from some brands.
Why test in fullscreen mode?
Fullscreen mode ensures the test covers every pixel and removes UI elements that could hide defects. It also provides accurate color display without browser interference.
What causes backlight bleeding?
Backlight bleed is caused by uneven light distribution from the LED backlight, often due to manufacturing tolerances or pressure on the panel frame.