Dead Pixel vs. Stuck Pixel: How to Tell
A tiny dot can be a failed pixel, a stuck subpixel, dust, a surface mark, or even an insect behind the panel. Comparing it across controlled colors is the safest first step.
The short version
| Symptom | Typical appearance | Software fix? |
|---|---|---|
| Dead pixel | Remains black on several bright patterns | Unlikely |
| Stuck subpixel | Remains one bright color or white | Sometimes changes, never guaranteed |
| Dust or surface mark | Soft edge, reflection-dependent, may clean off | Not applicable |
| Debris behind panel | Irregular shadow, often larger than one pixel | No |
Why one pattern is not enough
On a black screen, a dead pixel can blend into the background and a bright pixel becomes obvious. On a white screen, the reverse is true. Red, green, and blue isolate subpixel behavior. That is why a proper check cycles through all five patterns rather than using a single white image.
A safe confirmation process
- Clean the screen using the manufacturer’s instructions.
- Use native resolution and disable color filters.
- Run the full-screen pixel test.
- Compare the same point on red, green, blue, white, and black.
- Move your head. A reflection changes; a panel defect stays fixed.
- Photograph the location and note which patterns reveal it.
Why screenshots do not prove a panel defect
A screenshot records the digital frame sent to the display. It does not record whether a physical pixel emitted the correct light. If the suspected mark appears in a screenshot viewed on another display, the cause is software or image content—not a failed physical pixel on the original panel.
What not to do
Do not press, rub, tap, heat, or twist the display. Pressure can damage internal layers and create additional defects. A cautious, limited color cycle may be tried for a likely stuck subpixel, but it cannot repair failed electronics and should never delay a return or warranty claim for a new device.
Warranty documentation
Record the device model, serial number, purchase date, defect location, affected patterns, and viewing conditions. Check the exact policy because manufacturers may distinguish dark pixels, bright pixels, subpixels, clusters, and defects near the center.
How ScreenVitals approaches display advice
We separate observations from conclusions. Visual browser patterns can reveal symptoms, but panel type, settings, room lighting, viewing position, and camera processing all affect the result. When a purchase or warranty decision matters, repeat the test, document the conditions, and check the exact seller or manufacturer policy.
Read our methodology →