Black Screen Test

How to run the full black screen test

Start at your everyday brightness. Maximum brightness in a dark room can make a healthy LCD look alarming, while a dusty screen can imitate two or three bright pixels from arm's length. Clean first. Then keep the pointer near a corner and let the controls disappear.

1. 1

   Prepare the display

   Wipe away dust, dismiss notifications, and leave brightness at the level you normally use. Move this browser window fully onto the monitor, TV, tablet, or phone being checked.

2. 2

   Open pure black fullscreen

   Press Start Black Screen Test. Let your eyes settle for 15 to 20 seconds, then scan the center, edges, and corners from your usual viewing position.

3. 3

   Look for light and bright dots

   Note fixed colored pixels, pale edge patches, raised black areas, or a glow that moves when your head moves. Do not press or rub the panel.

4. 4

   Compare near-black levels

   Move through 1%, 2%, 5%, and 10%. These patterns can reveal tint, vertical bands, clouding, and local-dimming behavior hidden by a zero signal.

5. 5

   Confirm with another pattern

   Follow bright dots with a white and color pixel test. For fixed LCD edge leakage, continue with the dedicated backlight bleed test and its viewing-angle check.

Pure black display test for monitors and TVs

The tool draws a solid CSS color directly in the browser. There is no video player, logo, progress bar, or compressed frame. Fullscreen removes most browser furniture and gives every visible part of the panel the same signal.

Black screen OLED test

Pure black gives an OLED panel a zero-level signal. Compare the display with the room around it after your eyes adjust. A tiny red, green, blue, or white point may be a stuck subpixel; a faint interface shape can be image retention. But a perfect zero-black result says little about very dark shadow detail.

Switch to 1%, then 2% and 5%. Those levels keep pixels active and make vertical bands, pink or green tint, and near-black nonuniformity easier to see. A cold panel can look different after twenty minutes of ordinary viewing (subtle, but worth controlling before comparing two runs).

Black screen AMOLED test on a phone

AMOLED is an active-matrix form of OLED, so the same pure and near-black sequence applies. Turn off adaptive brightness for a repeatable comparison, dismiss the always-on display, and test in portrait and landscape. Status bars, camera cutouts, rounded panel corners, and gesture handles are physical or system-level areas; the webpage cannot remove every one of them.

Black screen pixel test for bright and stuck pixels

Colored or white dots stand out against black. Mark the location without touching the panel, change to 5%, and move your head slightly. Dust and reflections shift; a panel pixel stays anchored to the same screen coordinate.

Continue with the complete dead-pixel monitor test for white, red, green, and blue fields. Do not rely on black alone.

1080p black screen test and native display resolution

A CSS color has no embedded 1080p or 4K frame. It fills the browser's current fullscreen area, whether the system is outputting 1920 x 1080, 2560 x 1440, 4K, ultrawide, or a scaled Retina mode. That avoids video scaling and compression.

The screen-area number in the tool uses browser CSS pixels. Device pixel ratio describes scaling between CSS and device pixels, though it does not certify the panel's physical resolution. Check system display settings when exact output resolution matters.

Test monitor backlight bleed with a black screen

LCD light leakage usually appears as a fixed pale wedge or edge patch. IPS glow can brighten a corner too, but it changes with your angle and viewing distance. Pure black is the starting pattern. Near black helps when local dimming turns an all-zero frame deceptively dark.