Device BenchCluster · Screen & pixels
Display tests.
Eight instruments for the glass itself. The pixel test cycles solid colors so a single bad pixel has nowhere to hide; the touch test paints every contact the digitizer reports, so a dead zone shows as cells that never fill; four focused fields isolate bright-background, dark-background, red-channel, and mid-grey uniformity jobs; the refresh-rate test measures animation-frame timing; and the resolution test reports what the panel physically is — its pixel density and the real size of the glass, measured against a bank card. All run in this tab, and none needs anything installed.
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Instrument
Dead Pixel TestSolid color cycling to expose dead, stuck and hot pixels — with a fixer mode for the stuck ones.
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Instrument
Screen Resolution TestResolution, pixel density in ppi and the physical size of the glass — the browser reports the first, a bank card measures the rest.
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Instrument
White ScreenPure white edge to edge — video-call lighting, a tracing lightbox, or a clean field for spotting defects. Six more colors included.
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Instrument
Black Screen TestPure black shows what your panel does when it should show nothing: backlight bleed, glow, stuck pixels, and dust.
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Instrument
Red ScreenOnly the red subpixels lit — isolate a failed color channel, or dim it into low-glare night lighting.
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Instrument
Grey ScreenNeutral mid-grey — the field that shows dirty screen effect, mura and colour cast that white washes out.
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Instrument
Refresh Rate TestMeasure how often the browser draws a frame — normally your display's Hz — with the jitter and range shown, not just a rounded number.
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Instrument
Touch Screen TestA grid that paints under your finger — unpainted cells reveal dead zones, and numbered markers track every simultaneous touch.
Why the four solid fields are separate
The pages share a fullscreen mechanism, but the jobs are not interchangeable. A single field cannot maximize the contrast for every fault, and the practical uses differ as well. The table states the evidence each route is built to expose; the full measurement methodology explains why a rendered field remains an observation for the person at the screen rather than a browser verdict.
| Field | Primary job | What to look for |
|---|---|---|
| White | Bright backdrop, tracing light, and dark-pixel contrast | Dark dots, dust, edge tint, or a clean light field |
| Black | Dark-room panel check | Backlight bleed, glow, and bright or always-on pixels |
| Red | One-channel isolation and dim red work light | A failed red subpixel or uneven red-channel output |
| Grey | Mid-level uniformity | Banding, mura, dirty-screen effect, and colour cast |