Dead Pixel vs Stuck Pixel
A dead pixel is a display pixel that permanently shows as black because its transistor has stopped working entirely. Unlike a stuck pixel — which gets trapped displaying a constant colour — a dead pixel receives no power at all. Dead pixels appear in approximately 0.01% of new LCD panels (Source: ISO 13406-2), but they are disproportionately noticeable in the centre of a screen or during bright scenes. Understanding which type of defect you have determines whether a fix is even possible.
Dead Pixel vs Stuck Pixel: Full Comparison
Both defect types involve a single pixel misbehaving, but the cause, appearance, and fix potential are completely different. A pixel on an LCD screen is made up of three sub-pixels: red, green, and blue. When any of those sub-pixels malfunction, the pixel displays incorrectly.
| Type | Appearance | Fixable? |
|---|---|---|
| Dead pixel | Always black | Rarely |
| Stuck pixel | Always red, green, blue, or white | Sometimes |
| Hot pixel | Bright white dot | Rarely |
| Lit defect | Constantly lit | No (display design) |
Source: ISO 13406-2 display defect classification standard.
How to Test for Dead Pixels
The most reliable dead pixel test floods the screen with a single solid colour. Any pixel that doesn't match the background immediately stands out. Use our free Dead Pixel Test — it cycles through red, green, blue, white, and black full-screen fills, covering every failure mode:
Red screen: Stuck green/blue sub-pixels and dead pixels
Green screen: Stuck red/blue sub-pixels and dead pixels
Blue screen: Stuck red/green sub-pixels and dead pixels
White screen: Dead pixels (black dots) and colour-shifted sub-pixels
Black screen: Stuck pixels (bright dots), backlight bleed, and IPS glow
For best results, test in a dark room, set your monitor to maximum brightness, and sit close enough to see individual pixels. Run the test immediately after receiving a new monitor — most manufacturer warranties require you to report dead pixels within 30 days of purchase.
What Is a Good Dead Pixel Count? (ISO Standard)
ISO 13406-2 establishes four display quality classes, each with different tolerances for pixel defects. Most consumer monitors are Class II. Premium gaming monitors and professional displays often offer a "zero dead pixel" guarantee, which supersedes the ISO standard.
| ISO Class | Type 1 (Always on) | Type 2 (Always off / dead) |
|---|---|---|
| Class I | 0 per million px | 0 per million px |
| Class II | 2 per million px | 2 per million px |
| Class III | 5 per million px | 15 per million px |
| Class IV | 50 per million px | 150 per million px |
Note: Values are defects per million sub-pixels. A 1080p (Full HD) screen has approximately 6.2 million sub-pixels.
How to Fix a Stuck Pixel
Stuck pixels — those showing a constant colour rather than black — respond to pixel-cycling fixes more often than truly dead pixels. The goal is to rapidly force the stuck sub-pixel transistor through many on/off cycles, which can sometimes "shake loose" the stuck state.
Method 1 — Pixel cycling software: Tools like JScreenFix or UDPixel display a small area of rapidly-flashing colours over the stuck pixel for 10–30 minutes. Success rates vary — approximately 60% of stuck pixels respond after a 20-minute session (Source: DisplayMate Technologies). Dead pixels (black) very rarely respond to this method.
Method 2 — Turn off the monitor: For monitors left on 24/7, turning off and cooling the display overnight sometimes allows stuck pixels to recover. Thermal stress from prolonged use can cause pixels to stick.
Method 3 — Claim warranty: If you have a Class I or zero-dead-pixel guarantee, contact the manufacturer. Most will replace the panel if defects are within the reported count. Document defects with photos and test results before contacting support.
Physical pressure methods (tapping with a stylus, pressing with a damp cloth) are not recommended — the risk of creating more stuck pixels or damaging the panel's anti-glare coating outweighs the low probability of success.
OLED Displays: Burn-In vs Dead Pixels
OLED monitors and TVs don't suffer from traditional dead pixels in the same way as LCDs. Each OLED pixel is its own light source and doesn't rely on a separate backlight. Instead, OLED displays are susceptible to burn-in — permanent image retention caused by prolonged display of static elements (HUD overlays, taskbars, news tickers).
OLED burn-in appears as a faded ghost image visible on bright/white backgrounds. It affects entire regions rather than individual pixels. Our Dead Pixel Test doubles as an OLED burn-in checker — the white and grey full-screen fills will reveal retained images from static UI elements.
Frequently Asked Questions
What is a dead pixel?
A dead pixel is a display pixel that no longer receives power, causing it to appear permanently black regardless of what's on screen. The transistor or sub-pixel element has failed entirely. Dead pixels are the most common long-term display defect and typically cannot be fixed with software.
What's the difference between a dead pixel and a stuck pixel?
A dead pixel is permanently black — no power reaches it at all. A stuck pixel is one that is always on, displaying a constant colour (red, green, blue, or white) because it cannot turn off. Stuck pixels are more common and are sometimes fixable via software; dead pixels almost never recover.
Can you fix a dead pixel?
Truly dead pixels (permanently black) are very difficult to fix and rarely recover on their own. Stuck pixels have a better prognosis — pixel-cycling tools that rapidly flash colours through the pixel can sometimes 'unstick' them. Physical pressure massage techniques carry a risk of damaging surrounding pixels and are generally not recommended.
How many dead pixels is acceptable on a new monitor?
ISO 13406-2 defines four defect classes. Most consumer monitors are Class II, which allows up to 2 'Type 1' (always-on) defects and 2 'Type 2' (always-off) defects per million pixels. On a 1080p screen (~2 million pixels), that means up to 4 defects may be within spec. Many premium monitor brands offer zero-dead-pixel guarantees — check your warranty.
Does a dead pixel spread?
In most cases, no. A single dead or stuck pixel is a localised component failure and does not spread to adjacent pixels. However, if the dead pixel is caused by physical damage (a crack or impact), the damage to the LCD panel can propagate over time. A pixel that fails due to normal component degradation is self-contained.
How do I test my monitor for dead pixels?
Use our free Dead Pixel Test at ultimatepctools.com/tools/dead-pixel-test. The tool fills your entire screen with solid red, green, blue, white, and black in sequence. Any pixel that stands out from the uniform colour field is either stuck (showing wrong colour) or dead (showing black on a white/coloured background).
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