All-around check
A complete pass through the basics.
YOUR DISPLAY, UNDER A CLOSER LOOK
LCD screen test.
Compare familiar colors and gray shades on an LCD screen.
↗ No installation◉ Visual inspection⌂ Stays on your device
White
RGB 255, 255, 255YOUR TEST PATTERN
Start with white.
Select a color, then give it the whole screen.
← → Switch colorsEsc ExitF Fullscreen
Tap the pattern to show controls. No automatic cycling or flashing.
◎ You inspect the physical screen. Nothing is scanned or uploaded.Go at your own pace ↗
YOUR EYES. YOUR NOTES.
Keep a little record.
Save what you noticed, so you can compare later. One record per test, stored only in this browser.
⌂ Local to this deviceNo automatic result. Choose only what you actually observed.
A MORE FOCUSED LOOK
Something specific on your mind?
Choose a check for what you’re seeing.
Gray screen uniformity
Compare gray screen shades for bands, tint, and uneven areas.
Screen bleed (LCD)
Compare LCD black and near-black fields for edge light.
Dead pixel test
Fixed dark, bright, or colored points.
Screen burn-in
Lingering logos, shapes, or uneven tones.
OLED screen test
Compare gray and color fields on OLED or AMOLED screens.
TAKE A MINUTE. TAKE A CLOSER LOOK.
How to check an LCD screen with visual patterns
You do the observing.
We provide the patterns.
- 01
Use your normal comfortable brightness and viewing position. Avoid reflections and strong color filters.
- 02
Compare white, black, and RGB fields for a visible fixed point or tint.
- 03
Check near-black and middle gray for patches or uneven areas. For edge light, compare the dedicated LCD backlight check.
- 04
Record the same screen location and viewing conditions. Repeat during ordinary use before drawing a conclusion.
BEFORE YOU DRAW A CONCLUSION
Your screen check questions
What does this LCD screen test check?
It places familiar colors and gray levels in the browser so you can look for visible marks, tint, or uneven areas. It does not inspect the LCD electronics or score the panel.
Is this an LCD monitor tester?
It is a visual pattern tool for LCD monitors and other LCD screens. Use the same patterns at your normal viewing position and record what you see.
Can I run an LCD test on an iPhone or Android phone?
You can open the patterns in a phone browser, but many phones use OLED panels. The colors still display; the LCD backlight bleed check only applies to a display with an LCD backlight.
Can an LCD test measure response time or color accuracy?
No. A browser pattern cannot measure pixel response time, luminance, color error, or uniformity. Calibrated instruments and controlled methods are needed for those measurements.
How do I check LCD backlight bleed?
Open the separate backlight bleed test and compare black and near-black fields from your normal viewing position. Reflections and angle-dependent IPS glow can look similar.
Do I need an LCD screen test image or video?
No. The browser displays solid color and gray fields directly. If you are checking an OLED device, these patterns still appear, but the LCD backlight bleed check does not apply to OLED.
MAKE SENSE OF WHAT YOU SEE
Put your observation in context.
Compare the clues, then return to the tool to repeat your check.
Instructions source-checked · ScreenCheckup pattern values and method. Manufacturer guidance explains the concepts; it does not certify this tool or your panel.
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