TestMyGears

Screen uniformity test

Run a free monitor uniformity test in your browser. Cycle pure black, grey uniformity fields, and white to expose backlight clouding, vignette, tint shift, and OLED banding — use the 5×5 grid overlay to compare corners, edges, and center like a dedicated grey uniformity test or black uniformity test.

Flat grey field — use grid overlay to compare zones

Uniformity scan Mid grey

Uniformity Fields

Grid Overlay

What to Look For

Black field

Corner clouds & fixed bleed

Bleed

Grey uniformity

Green or pink tint by zone

Tint

Pure white

Dark corners & edge bands

Vignette

OLED near-black

Vertical banding & mura

OLED

Assessment Guide

Good uniformity

Grid cells match · No corner clouds → Panel OK

Issue detected

Dark corners · Bright patches · Green tint → Note for return

Professional monitor & OLED uniformity test

TestMyGears is a free screen uniformity test with flat grey fields, adjustable grid overlay, and center crosshair — built for monitor uniformity test, OLED grey uniformity test, and black uniformity test workflows without installing software. Whether you are checking a new IPS panel, laptop LCD, or OLED TV, the same division grid makes zone-to-zone comparison repeatable.

Grey & black uniformity fields

Cycle pure black, near-black, dark grey, mid grey, light grey, and white — the core steps in any grey uniformity test or black uniformity test. Black reveals backlight bleed and clouding; mid-grey exposes green or pink tint that disappears on colored content; white shows vignette and edge falloff.

Division grid overlay

A 3×3, 5×5, or 9×9 grid splits the panel into equal zones so you can score uniformity cell by cell instead of guessing. This is how reviewers run a monitor uniformity test — compare corner cells to center on the same flat field.

OLED & IPS ready

Near-black and custom grey % steps catch OLED vertical banding and mura that only appear at low drive levels. IPS glow shifts with viewing angle — tilt the screen while a black field is up to separate glow from fixed bleed.

What is screen uniformity?

Screen uniformity means even brightness and color across the panel — the goal of every monitor uniformity test, grey uniformity test, and OLED uniformity test search.

Backlight bleed vs IPS glow

Backlight bleed is fixed bright areas on pure black — common in IPS corners. IPS glow changes when you move your head; true bleed stays put. A black uniformity test in a dark room with a 5×5 grid makes the difference obvious.

Grey uniformity & tint

A grey uniformity test uses flat mid-grey (often 50% or 18%) because tint errors show clearly without crushing shadows. Green or magenta shifts between grid zones mean panel uniformity issues — not a bad cable or GPU.

Vignette on white

Pure white with a grid overlay reveals dark corners and edge bands — vignette. Mild falloff is normal on some monitors; severe vignette hurts photo editing and uniform UI work.

OLED mura & banding

OLED panels can show vertical bands or cloudy mura at near-black levels. An OLED grey uniformity test at 5–20% grey often reveals what a full black field hides. Some banding improves after a few hundred hours; fixed mura may qualify for warranty.

How to run a monitor uniformity test

A complete screen uniformity test combines the right grey level, room lighting, and a grid — whether you are running an OLED uniformity test, laptop panel check, or TV clouding pass.

  1. Pick the right fields

    Start with black and near-black for bleed and clouding — lights off, brightness max. Add mid-grey for grey uniformity test tint checks and white for vignette. Enable custom % near 18% if reviews for your model mention banding at specific drive levels. See also: Uniformity by device .

    Tip At least three fields (black, grey, white) cover most RMA documentation

  2. Set grid and crosshair

    Use 5×5 for monitors and laptops — 9×9 for detailed OLED grey uniformity test passes. Turn opacity to 35–45% so lines do not mask clouds. The center crosshair marks the reference cell; compare each corner to center on the same step. See also: Backlight bleed test .

    Tip 3×3 is enough for a quick unbox check; 9×9 for photo-grade panels

  3. Fullscreen and document

    Enter fullscreen, cycle fields with arrow keys, and note which zones fail on which step. Photograph fixed bleed on black for warranty — include the grid so support sees zone boundaries. Mild IPS glow is normal; bright static corners are not. See also: Color calibration test .

    Tip Auto-cycle in fullscreen helps compare steps hands-free in a dark room

Uniformity test terminology

Screen uniformity test

Any check for even brightness or color across the display — includes grey, black, and white fields. A screen uniformity test online runs in the browser with full-screen flat colors instead of test patterns on USB sticks.

Grey uniformity test

Flat mid-grey or custom % grey fields to expose tint and banding. OLED grey uniformity test searches often target 5%, 18%, or 50% steps where vertical banding appears.

Black uniformity test

Pure black or near-black in a dark room to reveal backlight bleed, clouding, and flashlighting on LCD panels. Distinct from grey uniformity — black shows light leaks, not color tint.

Monitor uniformity test

Panel-specific pass using division grids — the same workflow as RTings-style monitor uniformity test charts but interactive. Compare corner delta to center on each field.

Uniformity checks by device

How a monitor uniformity test, OLED uniformity test, or TV check differs by panel type and use case.

IPS monitors & laptops

  • Corner glow on black is often viewing-angle IPS glow — tilt to confirm.
  • Fixed bright blobs in the same grid cells every time = bleed.
  • Mid-grey reveals green tint on budget IPS.

Recommended Black + mid-grey + 5×5 grid

OLED monitors & TVs

  • Near-black and 5–18% grey for vertical banding and mura.
  • Full black may look perfect while grey uniformity test shows bands.
  • Some banding improves after pixel refresh — note if fixed.

Recommended OLED grey uniformity steps

VA gaming panels

  • Aggressive vignette on black and grey is common.
  • Compare to reviews — excessive corner crush may bother dark games.
  • Clouding on black often worse at max brightness.

Recommended Black at max brightness, lights off

Photo & design work

  • White field vignette affects flat UI mockups and proofs.
  • Grey uniformity test at 50% catches tint before calibration.
  • Pair with color calibration after uniformity pass.

Recommended White + 50% grey + 9×9 grid

Room & brightness tips

Dark room for black

Room light masks bleed on a black uniformity test. Turn off desk lamps, close blinds, and give eyes 30 seconds to adapt before judging corners.

Max brightness for bleed

Backlight clouding shows strongest at maximum brightness on LCD. Lower brightness for daily use later — test at max first for worst-case bleed.

OLED low-grey banding

For OLED uniformity test searches, add custom 5%, 10%, and 18% grey steps. Banding that only appears on one step is still a defect worth photographing.

When to RMA

Document fixed bleed, severe tint on grey uniformity test, or banding that covers multiple grid zones. One dim corner on white may be within spec; a bright flashlight in the same corner on every black field often is not.

Screen uniformity test FAQs

What grid size should I use for a monitor uniformity test?

5×5 is the best default for monitors and laptops. Use 9×9 for detailed OLED grey uniformity test inspection or 3×3 for a quick pass. Turn the grid off if lines distract from cloud shapes.

Do I need a dark room for a black uniformity test?

Yes — room light hides bleed and clouding on pure black. White and grey uniformity test steps work in normal lighting.

How is this different from the backlight bleed test?

The dedicated bleed page presets black-focused fields. This screen uniformity test exposes all grey levels, grid size, opacity, custom grey %, and crosshair for full panel coverage.

What is an OLED grey uniformity test?

Flat grey at low percentages (5–20%) where OLED vertical banding and mura appear. Full black can look uniform while near-black grey shows bands — enable near-black and custom % steps here.

Is IPS glow the same as backlight bleed?

No. IPS glow changes when you move your head or tilt the panel; bleed stays in the same grid zones. A black uniformity test with a 5×5 grid helps tell them apart.

What counts as a failed grey uniformity test?

Visible green, pink, or yellow tint differences between grid cells on the same mid-grey step, or obvious vertical bands on OLED at low grey. Mild corner dimming on white may be normal vignette — check reviews for your model.

Related display tests

Pair uniformity checks with bleed, color, and full display diagnostics.