Black Screen

Every other page here asks a display to emit something; a black screen asks it to emit nothing , and whether it actually can depends entirely on the panel underneath it. That single question is the biggest difference between screen technologies, which is why a full black field is the most revealing test pattern in the set, and also the most useful background when you want a screen to stop drawing attention to itself.

What black looks like on your particular panel

On an LCD , which covers most monitors, laptops and budget televisions , the backlight stays on whatever is displayed. Black is produced by the liquid crystal layer blocking that light, and it never blocks all of it. What you see is very dark grey, plus whatever light escapes unevenly around the edges.

On OLED and QD OLED, each pixel makes its own light, so a black pixel is switched off. The result is genuinely black, with no glow and no leakage. This is why the same test tells you two different stories: on an LCD you are looking for uneven leakage, and on an OLED you are looking for anything lit at all.

Testing for backlight bleed, IPS glow and clouding

This is what most people open a black screen for, and it is worth doing carefully, because the test is easy to run badly and produce a scary looking result from a perfectly normal panel.

1. Put the monitor where you actually use it and sit at your usual distance and height. Corner glow gets dramatically worse from an unusual angle.
2. Dim the room. Not pitch black , total darkness exaggerates everything and tells you little about how the screen behaves in real use.
3. Set brightness to what you normally run, then repeat at a higher level. Judging a panel at 100 % brightness in a dark room is a stress test, not a verdict.
4. Go fullscreen and give your eyes fifteen to thirty seconds to adapt before deciding anything.
5. Move your head slowly left, right, up and down while watching the corners.

That last step is the one that separates the two faults. IPS glow is a haze near the corners that shifts, grows or fades as your viewing angle changes , it is normal behaviour for IPS panels and cannot be repaired. Backlight bleed stays anchored to the same spot no matter where your head goes; it comes from uneven pressure or assembly in the panel stack and is a manufacturing issue. Clouding is patchier, more like blotches across the middle than light along an edge.

This table gives a starting hypothesis, not a diagnosis. Photographs, forum comparisons and even careful eyes cannot replace the tolerance figures a manufacturer actually measures against , use it to decide whether something is worth a closer look, not as a final verdict.

Before deciding a panel is defective, check it against content you actually watch: a dark game menu, a film with letterbox bars, a night scene. A small amount of edge light that only appears on an artificial black field at maximum brightness is common and rarely worth a return. Light that distracts you during ordinary use is a different matter, and that is the argument to make to a manufacturer.

Finding stuck and hot pixels

A black field is the strongest possible background for anything that is lit when it should not be. A hot pixel shows as a white dot; a stuck subpixel shows as a small red, green or blue point. This is the mirror image of the white screen test, which is the one that exposes dead pixels , those stay black and vanish against black entirely. Running both is what makes a pixel check complete.

On an OLED panel a bright dot on black is more significant than the same dot would be on an LCD, because there is no backlight that could be leaking. Faint shapes or ghosted outlines on black are a different symptom again and point towards image retention rather than a pixel fault.

Black as a working background

• On an OLED phone or laptop, black pixels are off pixels. A full black screen genuinely draws less power on those panels, which is the mechanism behind system wide dark modes. On a conventional LCD with a fixed backlight level, the saving is usually small because the backlight remains active. Some LCDs with local dimming or dynamic backlight control can reduce power with darker content.
• In a dark room, a black screen lets you leave a device on and awake without lighting the room, which is useful when a machine must not sleep but must not glow either.
• As a screen you want ignored. A monitor showing full black looks switched off from across a room, which is the entire basis of the broken screen and fake loading screen pages.
• Behind a presentation. Going black between slides puts attention back on the speaker without exposing a desktop.

Blacking out a second monitor without turning it off

A multi monitor setup often has one screen doing nothing useful for a while , glowing next to a film, a game or a presentation and pulling your eye sideways. Opening this page on that monitor and going fullscreen fills it with black without touching a power button or a display sleep setting, and it comes back the moment you press Esc or click back onto it.

• Watching a movie or playing a game on the main screen without a bright browser tab or file explorer bleeding light from the side.
• Recording or streaming where a second monitor showing chat or notes should not appear lit up in a webcam reflection or a room shot.
• Presenting from a laptop connected to a projector, where the laptop’s own screen can stay black instead of showing the desktop to the room.

Photography and video uses

A black screen is not a light, but it is a useful absence of one.

• Negative fill. Placing a black surface on the shadow side of a subject removes bounced light and deepens the shadow. A laptop or tablet showing black is a small, flat, matte ish version of the black card used for this in a studio.
• A seamless dark backdrop for photographing small objects , jewellery, components, food , where an unlit background needs to fall away to nothing.
• Checking reflections. Glossy products photograph badly because they mirror the room. A black screen positioned where the reflection lands kills the highlight without adding a shadow.

The obvious limit: any screen showing black still has a glossy or semi glossy surface, so at some angles it will reflect the room right back at you. Angle it away from your light sources.

Using and downloading it

1. Press Open fullscreen. The entire display goes to #000000 with no interface left on screen.
2. Wait for your eyes to adjust before evaluating anything , a dark field looks very different after thirty seconds than it does after one.
3. Press Esc, or tap Exit, to come back. On iPhone and iPad the page uses a full screen overlay instead of true browser fullscreen, which behaves the same way.
4. To export the colour, pick a preset or type your own width and height and press Download. The file arrives as, for example, black screen 3840x2160.png.

The presets are 720p (1280×720), 1080p (1920×1080), 2K (2560×1440), 4K (3840×2160), Square (1080×1080) and Mobile (750×1334), and the pixel fields accept any values you type. A pure black PNG is a handy thing to keep around: it works as a wallpaper on an OLED phone, as a placeholder in a video timeline, or as a fill layer in an editor.

What this black screen offers

• True #000000 with no dark grey, gradient or logo
• Fills the display in one press, with no browser interface visible
• On screen controls fade away so nothing glows over the panel during a bleed test
• Works on monitors, laptops, phones, tablets and televisions through the browser
• Any hex value can be typed in, so near black values can be compared directly
• Exports as PNG, JPG, WebP or SVG, with PNG available for an exact #000000 flat field
• Nine useful presets plus arbitrary custom pixel dimensions
• Generated locally in the browser , nothing uploaded, nothing stored
• Descriptive filenames including the pixel size
• No signup, no watermark and no advertising inside the file
• Keyboard operable, with Esc always available to exit
• Visible focus outlines for keyboard and switch users
• Honours the system reduced motion setting
• Loads with no web fonts and no third party scripts
• No account is required for the core tool
• Direct links to the other test colours from the same screen

What a black screen cannot tell you

• It cannot fix backlight bleed. Bleed is physical, caused by pressure and assembly inside the panel; no image, driver or calibration changes it.
• It will not reveal dead pixels , those are black already. That is the white screen test.
• It is not a burn in test on its own. Retention shows up as faint shapes on mid grey and colour fields, so pair it with the grey screen.
• On a conventional LCD with a fixed backlight level, displaying black usually changes power use very little. Some LCDs with local dimming or dynamic backlight control can reduce power with darker content, while self emissive OLED panels can switch black pixels off.

Related screens

Run white next to catch dead pixels and dust, grey for uniformity and banding, and red, green and blue to identify which subpixel a lit dot belongs to. For the Windows crash screen that people also call a black screen, see the Blue Screen of Death and Microsoft boot screen pages.

Questions people ask about black screens