Display diagnostics
Use fullscreen patterns to check dead pixels, backlight bleed, gradients, sharpness, and motion ghosting.
Pick a pattern. Preview it. Then check the full screen.
Twelve timed steps cover primary colors, dark tones, gradients, and motion.
Use fullscreen and switch between red, green, blue, white, and black. Recheck the same spot and note its color and position.
Use grids, lines, bars, and text to inspect scaling and edge clarity.
Choose by goal
Start with Quick for a broad check. Use a focused mode when one issue needs a closer look.
Before you start
Wipe away dust and fingerprints before you judge a small mark.
Set the display to its recommended resolution before you inspect fine lines or text.
Wait a moment after changing brightness so the picture stays steady during the test.
Turn off automatic brightness so dark and light patterns do not change the display while you inspect them.
For SDR patterns, pause dynamic contrast and similar picture changes. Restore your settings when you finish.
Lower room light for a backlight check. Judge any glow from your normal seat because viewing angle can change it.
Reading results
A dead pixel stays dark on white or colored backgrounds. A stuck pixel keeps one color. Bright pixels or subpixels stay lit on black: white can indicate a whole pixel, while red, green, or blue can indicate a subpixel. These clues can overlap.
Use black or 5% gray in a dim room. Check from your normal seat. Edge bleed stays near the frame. Panel glow often changes with your viewing angle.
A smooth fade should not break into hard steps. If bands appear in only one photo or video, the source may contain them.
Follow the moving edge. Trails show ghosting. Bright inverse halos can point to strong overdrive. Some blur is normal while an object moves.
Fine lines and text should stay distinct. If they blur or shimmer, first use native resolution and review display scaling and browser zoom.
FAQ
Clean the screen as the manufacturer recommends; reflected light can make dust look like a faulty pixel. Recheck on several solid colors. A mark staying in one place is a clue, not proof of a pixel defect.
This test can show visible tint, bands, and uneven color. For exact color results, use a color meter.
Fullscreen hides most browser controls and fills the edges. Small pixel and backlight issues are easier to see.
Run the test again and note the spot. Then read the support or pixel policy for your model and region.
No. Use normal room light for pixel and sharpness checks. Dim the room only for dark-screen uniformity and backlight checks.
Yes. The patterns work on mobile screens. Some browsers keep a small system bar visible, so inspect that edge again after rotating the device.
A screenshot records the image sent to the display, not the panel itself. Follow the maker's support steps if it asks for a photo or other proof.
The Guided Test takes about one minute. A focused check usually takes a few more minutes when you repeat a suspicious pattern.
Next step
Run the guided sequence for a broad pass, or return to the workbench and focus on one pattern.
