Understanding Monitor Display Tests

Display testing is essential for ensuring your monitor performs at its best. Whether you're a professional photographer, gamer, or everyday user, understanding your display's capabilities and limitations helps you make informed decisions and get the most out of your hardware.

Test Descriptions

1. Test Pattern

Check image quality with circles, lines, and color gradients

2. Defective Pixels (Black)

Check for defective pixels - all pixels should be black

3. Defective Pixels (White)

Check for defective pixels - all pixels should be white

4. Defective Pixels (Red)

Check for defective pixels on red background

5. Defective Pixels (Green)

Check for defective pixels on green background

6. Defective Pixels (Blue)

Check for defective pixels on blue background

7. Uniformity

Assess brightness uniformity across the screen

8. Color Distances

Test how well your monitor differentiates similar colors

9. Gradients

Check for color banding in smooth gradients

10. Sharpness

Test text rendering sharpness

11. Viewing Angle

Test viewing angle stability

12. Gamma

Determine your monitor's gamma value

13. Response Time

Test for ghosting and trailing artifacts

14. Black Level

Test visibility of dark shades near black - all squares should be distinguishable

15. White Saturation

Test visibility of bright shades near white - all squares should be distinguishable

16. Contrast

Check contrast across the full brightness range for all colors

17. Inversion (Pixel Walk)

Test for pixel inversion artifacts in fine patterns

18. Motion Blur (UFO)

Track the moving UFO to check for motion blur and ghosting

19. Color Bars

SMPTE-style color bar pattern for color accuracy checking

20. Checkerboard

Test 1:1 pixel mapping and sharpness with checkerboard patterns

21. Aspect Ratio

Verify circles appear round - checks for correct aspect ratio

When to Test Your Display

When purchasing a new monitor - check for defects within the return period
After updating graphics drivers or changing display settings
When setting up a multi-monitor configuration
Before starting color-critical work like photo editing
If you notice visual anomalies during normal use
Periodically to monitor display health over time

Frequently Asked Questions

A display test is a comprehensive check of your monitor's capabilities and defects. It helps identify issues like dead pixels, backlight bleeding, color accuracy problems, and uniformity issues. Running these tests is especially important when buying a new monitor or troubleshooting display problems.

A dead pixel is permanently off and appears as a black dot on your screen, regardless of what color is displayed. A stuck pixel is permanently on and appears as a bright colored dot (usually red, green, or blue). Stuck pixels are sometimes fixable, while dead pixels usually cannot be repaired.

Use the Defective Pixels test with a black screen in a dark room. Look around the edges and corners of your display for any light leaking through. Some backlight bleed is normal, especially on LED-backlit displays, but excessive bleeding may indicate a defect.

The Gamma test helps determine your monitor's gamma value, which affects how brightness levels are displayed. A gamma of 2.2 is standard for most content. If the striped pattern and solid gray don't match at 2.2, your monitor's gamma may need calibration.

Color banding appears as visible steps or bands in what should be smooth gradients. Use the Gradient Test to check for banding - a good display will show smooth transitions from black to white without visible steps or color shifts.

The Response Time test shows moving objects that help you identify ghosting or trailing artifacts. Faster response times mean less blur behind moving objects. Adjust the speed and distance to compare your monitor's performance.

The Black Level test displays 20 grey squares on a black background with values from 1-20. On an ideal monitor, all squares should be distinguishable from each other and from the black background. This tests your monitor's ability to display dark shades accurately.

The Motion Blur test displays a moving UFO that you should track with your eyes. This reveals motion blur and ghosting artifacts caused by slow pixel response times. Higher refresh rate monitors and faster response times will show less blur behind the moving object.

The Checkerboard test with 1-pixel squares verifies that your monitor is displaying at its native resolution with proper 1:1 pixel mapping. If the pattern appears to shimmer or show moiré effects, your display may be scaling the image or there could be sharpness issues.

Display Test

How to Use the Display Test