A dead pixel is a single point on your screen that has stopped emitting light altogether. It stays black whatever the display is asked to show — one dot out of the two million on a 1080p panel, which sounds like nothing right up until you notice it, after which it is the only thing you can see. This page explains what that dot actually is, why it stopped working, how to confirm it in about a minute, and what can realistically be done about it.
On this page
- What is a pixel on a screen? — the physical dot, and why it is not the same thing as a pixel in an image file
- How do screen pixels create colour? — three sub-pixels, and the whole visible spectrum from the mix of them
- What makes a pixel dead rather than stuck? — the precise definition, and the two faults constantly mistaken for it
- What causes dead pixels? — manufacturing, impact, liquid and age — and which of those you could have prevented
- How do you find a dead pixel on your screen? — the one-minute check, and how to prepare so you do not chase dust
- Can a dead pixel be fixed or repaired? — the honest answer, plus the fix that does work on the fault people confuse it with
- Does a dead pixel qualify for a warranty claim? — dead-pixel policies, thresholds, and what to have ready before you call
What is a pixel on a screen?
A screen is a grid of tiny light sources. Each one is a pixel, short for “picture element”, and each is built from three sub-pixels — one red, one green, one blue — sitting side by side and too small to separate at normal viewing distance. Your eye blends them into a single colour.
Photographs hide this completely. Zoom far enough into any image on a screen and the illusion collapses into the grid it was always made of:
Modern phone displays pack over 300 pixels into every inch, which is roughly the point at which the human eye stops resolving individual dots at arm’s length. That density is also why a single failed pixel on a phone is much harder to spot than the same failure on a large, coarse television panel. If you want the physics underneath all of this, how LCD screens work covers the layers involved.
Rendered pixels and physical pixels are not the same thing
When an operating system reports a resolution it is describing rendered pixels — the grid the software draws into. The panel has its own fixed grid of physical pixels, and the two only line up when you are running at native resolution. Scaling, zoom levels and high-DPI modes all put a translation layer between them.
This matters for pixel hunting: a scaled display can blur a genuine fault into something that looks like softness, and can make ordinary rendering artefacts look like hardware faults. Confirm you are at native resolution with our screen resolution test before you start.
How do screen pixels create colour?
Every colour a screen can show comes from varying the brightness of those three sub-pixels. Red and green together give yellow. All three at full give white. All three off give black. Everything else is a ratio somewhere in between, and the panel does this several million times over, sixty or more times a second.
The tool below is a single pixel, blown up enormously. Drag the sliders and watch the three channels combine — it is the clearest way to understand what is failing when one sub-pixel or the whole pixel stops responding.
Change the intensity of each primary colour to change the colour of the pixel
What makes a pixel dead rather than stuck?
A pixel is dead when it no longer receives power or no longer responds to it. All three sub-pixels stay off, so the pixel renders black permanently. It does not flicker, it does not change with the image behind it, and it looks identical on a white background and a blue one — a black speck that never moves.
That permanence is the diagnostic. Anything that changes colour as the screen changes is not a dead pixel, and quite often is not a pixel fault at all.
Dead pixels, stuck pixels and hot pixels
Three different faults get called “dead pixel” in everyday use, and the distinction decides whether it is fixable:
- Dead — permanently black, receives no signal. Not repairable in software.
- Stuck — permanently lit in one colour, usually red, green or blue, because one or two sub-pixels are jammed on. Often repairable. See what a stuck pixel is.
- Hot — permanently white, all three sub-pixels jammed on at full.
A black dot on a white background could be dead, or it could be a stuck pixel showing black-ish. The reliable test is to cycle through several full-screen colours and watch whether the dot ever changes. Our comparison of dead and stuck pixels walks through the differences properly.
What causes dead pixels?
Four causes account for almost every dead pixel. Only two of them are anything you could have influenced. What causes dead pixels goes into more depth on each.
Dead pixels from manufacturing defects
The most common cause by far. A panel contains millions of transistors laid down at microscopic scale, and a small failure rate is unavoidable. Manufacturers know this, which is why almost every warranty specifies a threshold — a certain number of dead pixels before the panel counts as faulty. A defect present from day one will be visible on the very first power-up if you look for it, which is the single best argument for testing a new screen immediately.
Dead pixels from physical damage
Pressure on the panel, a drop, or a knock to the lid of a closed laptop can sever the connection to individual pixels. Damage from impact tends to cluster rather than appear as one isolated dot, and often spreads over the following weeks as the surrounding structure gives way.
Dead pixels from liquid damage
Moisture reaching the layers of an LCD corrodes the connections. This usually shows as patches and discoloured blooms rather than crisp single dots, and it does not stop progressing on its own.
Dead pixels caused by screen ageing
Every panel degrades. On LCD the backlight dims and the liquid crystal responds less precisely; on OLED, individual sub-pixels wear at different rates and eventually stop lighting altogether, which is why OLED ages into both dead pixels and burn-in. Dead pixels on OLED behave differently enough to be worth reading separately.
How do you find a dead pixel on your screen?
The method is simple: fill the screen with one solid colour at a time and look for anything that does not belong. Black reveals stuck and hot pixels. White reveals dead ones. Red, green and blue each reveal a single failed sub-pixel that the other colours hide.
Clean the screen first. A speck of dust is indistinguishable from a dead pixel until you wipe it away, and it accounts for a large share of false alarms — clean it safely, never with household glass cleaner. Then work through the colours slowly, in a room without glare, and look at the whole screen rather than staring at one spot.
Our dead pixel test does the colour cycling full-screen in your browser. For a television or anything you cannot open a browser on, the test videos cover the same sequence at your aspect ratio. How to run a dead pixel test has the full procedure, including how to prepare the screen properly.
Can a dead pixel be fixed or repaired?
A genuinely dead pixel cannot be repaired in software. There is no sequence of colours, no application and no pressure technique that restores power to a pixel that is no longer receiving any. Anything promising otherwise is describing a stuck-pixel fix.
That distinction is worth caring about, because stuck pixels are often recoverable, and they are misidentified constantly. Rapidly cycling the sub-pixels can shake a jammed one loose — our dead pixel fixer runs that pattern, and it wants at least an hour on the fault. Every method for reviving a stuck pixel covers the alternatives, including the pressure technique and its risks.
If the fixer does nothing after several hours, the pixel is almost certainly dead rather than stuck, and the question becomes a warranty one.
Does a dead pixel qualify for a warranty claim?
Most manufacturers publish a dead-pixel policy with a threshold: a certain number of failed pixels, sometimes weighted by whether they are dead or stuck and whether they sit in the centre of the screen or near an edge. A single dead pixel often falls below it. Premium and professional panels tend to have stricter policies, and some are sold with a zero-dead-pixel guarantee.
Before you contact anyone: photograph the screen showing the fault on both a white and a black background, note the position, and confirm it is not dust. If the panel is new, do this immediately — several policies only apply within a short window from purchase.
It is also worth knowing how common faults are on your brand before you argue the case. We publish the results people report to us, broken down by manufacturer, and testing a monitor covers what to document. If it turns out you are dealing with something else entirely, what to do about a dead pixel on screen is the broader guide.
