All-around check
A complete pass through the basics.
YOUR DISPLAY, UNDER A CLOSER LOOK
Black screen.
A plain black screen for a dark-room visual check or a full-screen background.
↗ No installation◉ Visual inspection⌂ Stays on your device
Black
RGB 0, 0, 0YOUR TEST PATTERN
Start with black.
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.
LCD screen test
Compare familiar colors and gray levels on an LCD.
TAKE A MINUTE. TAKE A CLOSER LOOK.
How to use a fullscreen black screen
You do the observing.
We provide the patterns.
- 01
Set a comfortable brightness. Maximum brightness and a fully dark room can exaggerate light around LCD edges.
- 02
View the panel from your normal position first, then change your viewing angle slightly.
- 03
If a bright area catches your eye, compare it with near-black gray using the backlight test.
- 04
Leave full-screen with Escape. Do not press or bend the display.
BEFORE YOU DRAW A CONCLUSION
Your screen check questions
Why use a black screen?
A solid black field is a high-contrast background for a manual look at bright marks and LCD edge light. It does not measure dark-level performance.
Is every glow on black a backlight defect?
No. Reflections, LCD viewing-angle effects, local dimming, exposure, and other conditions can look similar. Use the dedicated guide to repeat the observation.
Does OLED use an LCD backlight?
No. OLED pixels emit their own light. The backlight bleed test is intended for LCDs.
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 · Apple: OLED has no backlight. Manufacturer guidance explains the concepts; it does not certify this tool or your panel.
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