Quick Reference: Dead Pixel Colors
| Color | Sub-pixels affected | Defect type | Fixable by software? |
|---|---|---|---|
| Black | All three off | True dead pixel | Rarely |
| White | All three stuck on | Stuck pixel | Sometimes |
| Red | Red stuck on | Stuck pixel | Sometimes |
| Green | Green stuck on | Stuck pixel | Sometimes |
| Blue | Blue stuck on | Stuck pixel | Sometimes |
| Yellow | Red + Green stuck on | Stuck pixel | Less likely |
| Cyan | Green + Blue stuck on | Stuck pixel | Less likely |
| Magenta | Red + Blue stuck on | Stuck pixel | Less likely |
The color of a pixel defect is diagnostic — it tells you which sub-pixel components have failed and whether the defect might be fixable without a hardware replacement.
Black Dead Pixels
A black dead pixel is the only type that confirms a true dead pixel in the technical sense. The transistor controlling the pixel has failed completely, cutting power to all three sub-pixels (red, green, blue). On an LCD, the liquid crystal layer defaults to its opaque resting state — blocking the backlight — making the pixel appear permanently dark.
On every background color, a black dead pixel looks identical: a tiny, fixed black dot that never changes. This complete consistency across all backgrounds is the defining characteristic of a true dead pixel.
Black dead pixels are invisible on a black background and most visible on white, light gray, and brightly colored backgrounds. They are generally permanent and almost never respond to pixel-cycling repair software, since there is no electrical signal reaching the pixel to cycle.
White Dead Pixels
A white pixel defect is all three sub-pixels simultaneously stuck in the on state. It is more accurately a triple stuck pixel than a true dead pixel — the pixel is receiving too much signal rather than none.
White stuck pixels appear as a bright white dot visible on virtually all backgrounds, but are most conspicuous on dark ones. They are rarer than single-channel stuck pixels because three independent sub-pixels must fail in the same way simultaneously — a less likely coincidence than a single transistor failure.
White stuck pixels have a somewhat better chance of responding to pixel-cycling repair software than black dead pixels, since the sub-pixels are active and can potentially be cycled out of their locked state. Try the dead pixel fix tool before pursuing a warranty claim.
Red Dead Pixels
A red pixel defect means the red sub-pixel is permanently on while the green and blue sub-pixels function normally (or are off). The red channel in an LCD transmits only long-wavelength light through the color filter — when stuck on, it emits a constant red dot.
Red stuck pixels are moderately visible. They stand out most clearly against blue, green, cyan, and black backgrounds. On a red or orange background, a red stuck pixel blends in nearly completely — which is a useful diagnostic indicator during the color cycle test.
Green Dead Pixels
Green is the most commonly observed single-channel stuck pixel color, and also the most visually prominent when present. This is because the human visual system has peak sensitivity in the green wavelength range — the green color channel corresponds to the photoreceptors in the eye that are most sensitive to luminance.
A green sub-pixel stuck on produces a bright green dot that is particularly conspicuous on purple, red, magenta, and dark backgrounds. Green stuck pixels sometimes respond to pixel-cycling software, partly due to the sub-pixel architecture in most IPS and TN panels where the green channel is the most electrically active.
Blue Dead Pixels
A blue stuck pixel occurs when the blue sub-pixel is permanently on. Blue is the weakest of the three primary colors in terms of perceived brightness to the human eye — the blue channel contributes the least to overall luminance perception. This makes blue stuck pixels the least visually intrusive of the three single-channel defects, though they are still clearly visible on dark and warm-colored backgrounds.
Blue sub-pixels also tend to have a higher degradation rate on OLED displays compared to red and green. Blue organic emitters are inherently less efficient and shorter-lived than their red and green counterparts. On aged OLED panels with heavy use, isolated blue sub-pixel failures are not uncommon.
Yellow, Cyan, and Magenta Pixels
Two-channel stuck pixels occur when two sub-pixels are simultaneously stuck on:
Yellow (Red + Green): A warm yellow-orange dot. Visible primarily against blue and dark backgrounds, where neither the red nor green components are matched by the background color.
Cyan (Green + Blue): A cool blue-green dot. Visible against red and dark backgrounds.
Magenta (Red + Blue): A pink-purple dot. Visible against green and dark backgrounds.
Two-channel stuck pixels are less common than single-channel defects. Because two independent sub-pixels must fail simultaneously, they are more likely to result from a broader electrical fault or regional panel quality issue than a single transistor failure. They are less likely to respond to pixel-cycling software due to the dual-channel nature of the failure.
Dead Pixel Lines and Clusters
When a full line of pixels fails — a complete vertical stripe or horizontal band — this is not multiple individual pixel failures. It indicates a failed row or column driver in the display's driver IC (integrated circuit), which controls entire rows or columns of pixels simultaneously. When a driver fails, all pixels in that row or column lose their signal at once.
Similarly, a sudden cluster of dead pixels in one region of the screen indicates:
- Physical damage to the TFT layer in that zone
- Delamination of the LCD layers from pressure or impact
- Regional driver IC failure affecting a section of the panel
These are panel-level failures, not individual pixel transistor failures. They represent more serious defects and are more compelling for warranty replacement claims than isolated single-pixel defects.
Using the Color Test to Diagnose Your Defect
The dead pixel test tool cycles through six solid background colors: Black, White, Red, Green, Blue, and Gray. Here is how to interpret what you observe:
- Dot visible on all light backgrounds, always black: True dead pixel. Transistor failure. Note the position and document it.
- Colored dot that disappears on matching background: Stuck pixel. A red dot that vanishes on the red background confirms a stuck red sub-pixel.
- White dot visible on all dark backgrounds: All three sub-pixels stuck on simultaneously.
- Dot that changes color across backgrounds: This is unusual — it may indicate an adjacent pixel or sub-pixel interference rather than a single isolated defect.
Recording which backgrounds the defect appears on and its color is also useful information when documenting a warranty claim.
Frequently Asked Questions
Can a dead pixel be white?
A white pixel defect is technically a stuck pixel rather than a true dead pixel — all three sub-pixels are permanently on rather than off. It appears as a bright white dot, most visible on dark backgrounds.
Is a red dead pixel fixable?
Red, green, and blue pixel defects are stuck pixels, not dead pixels. Stuck pixels have a better chance of responding to pixel-cycling software than black dead pixels. Try the dead pixel fix tool before pursuing a warranty claim.
Why is my dead pixel green?
A green pixel defect means the green sub-pixel is permanently on. Green is the most common stuck pixel color because the green channel corresponds to peak human color sensitivity and is the most electrically active channel in most LCD panel designs.
Can a dead pixel change color over time?
A true dead pixel (always black) does not change color — it remains black permanently. Stuck pixels maintain their fixed color. If you see a pixel that actively changes color during normal display use, it is more likely a software artifact or signal issue than a hardware pixel defect.
What is a dead pixel on a black background?
A dead pixel is invisible on a black background because black matches the pixel's own appearance when it receives no power. This is why the color cycle test includes multiple backgrounds — a dead pixel only becomes visible on lighter colors like white, red, green, or blue.