White Screen Test
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White Screen Test
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White Screen Test: a Guided Check for Any Display
This is a guided version of the classic white screen check. Instead of a single blank page, it walks you through six fullscreen test patterns - white, gray, black, red, green, and blue - with an on-screen hint telling you exactly what to look for on each one. Click the preview to start, click to advance, and press Escape to finish.
What Each Step Reveals
- Pure white - the master uniformity check. The panel should look evenly white edge to edge. Watch for yellowish or pinkish tint, dark corners, and shadowy patches (the "dirty screen effect").
- 50% gray - uneven backlighting and banding show up on gray before you would ever notice them on white. Gray is what professional calibrators use.
- Black - turn the room lights down and check the edges: glowing patches are backlight bleed, hazy areas are clouding. On OLED, black should be perfectly off.
- Red / Green / Blue - each solid primary isolates one subpixel. A dot glowing the wrong color is a stuck subpixel; run the dedicated dead pixel test to inspect it closely.
When Should You Worry?
Mild tint variation and a little bleed are normal on LCD panels - perfection exists only in marketing. Worry when defects are visible during normal use: a tinted half on a photo-editing monitor, bleed that distracts in dark movies, or any dead pixel on a brand-new device (check your warranty's pixel policy - many brands replace panels for a single defect).
Test New and Used Screens Before Committing
The best time to run this test is the day a monitor arrives - or right before you hand over cash for a used one. It needs no install and works on any device with a browser: monitors, laptops, phones, tablets, projectors, and TVs. For a quick everyday blank screen instead of a guided test, the classic white screen is one click away, and the black screen doubles as an OLED-friendly blank display.
Frequently Asked Questions
What does a white screen test check for?
A fullscreen white image makes display problems visible: dead pixels appear as black dots, tint problems appear as yellow or pink areas, and uniformity issues appear as darker patches. The guided version here adds gray, black, and RGB steps for backlight bleed and stuck subpixels.
How do I test my monitor for backlight bleed?
Use the black step of this test in a dim room with your screen at normal brightness. Glowing spots along the edges or corners are backlight bleed. Minor bleed is normal for LCD panels; heavy bleed visible during dark movie scenes may justify a warranty claim.
Why does my white screen look yellow or pink?
A warm or pink tint can come from a night-light/blue-light filter being active, a color profile issue, or genuine panel tint. Disable Night Shift or Night Light first, then re-run the test. If one area stays tinted while the rest is white, it is the panel itself.
Is this test accurate for phones and TVs?
Yes - the test patterns are plain fullscreen colors, which render identically on any display technology. Open this page in your phone, tablet, or smart TV browser and run the same steps.
How often should I test my screen?
Test any new display on arrival (while returns are easy), before buying second-hand, and occasionally after long heavy use - panels can develop stuck pixels and uniformity drift over time.
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