Dead Pixels vs. Stuck Pixels
Every pixel on your monitor is actually composed of three smaller "sub-pixels": Red, Green, and Blue. By varying the intensity of these three colors, your screen generates the millions of colors you see. When a pixel malfunctions, it usually falls into one of two categories:
- Dead Pixel: The transistor powering the pixel has completely failed. It receives no power, resulting in a tiny, pure black dot on your screen. Use our Pure White test to easily spot them.
- Stuck Pixel: One or more of the sub-pixels is permanently locked in the "on" state. You will see a tiny, bright dot (usually red, green, or blue) that never changes. Use our Pure Black test to find them.
What is Backlight Bleed?
LCD and LED monitors rely on a backlight panel behind the actual screen to produce a visible image. If the bezel isn't sealed perfectly, light can "bleed" through the edges, resulting in cloudy, glowing patches around the corners of your screen. This is most visible in a dark room using our Pure Black test.
What is IPS Glow?
IPS (In-Plane Switching) panels are famous for incredible color accuracy, but they inherently suffer from "IPS Glow." This is a slight, shimmering glow visible from off-angles when displaying dark scenes. Unlike backlight bleed, IPS glow changes intensity as you move your head.
Color Banding and Gradient Testing
Modern monitors boast 8-bit or 10-bit color depth, which means they can display millions or even billions of colors. However, low-quality panels or poor cable connections can limit this depth.
If your monitor suffers from Color Banding, smooth gradients (like a sunset in a video game) will appear blocky, showing distinct "steps" or "stripes" of color instead of a smooth transition. Use our Gradient tests to ensure your display drivers are correctly outputting high-bitrate color signals.
Frequently Asked Questions (FAQ)
Can a stuck pixel be fixed?
Sometimes! Because stuck pixels still receive power, rapidly flashing them with different colors can sometimes "unstick" the liquid crystal. Gently massaging the area with a microfiber cloth can also occasionally resolve it.
Will a warranty cover a dead pixel?
This depends heavily on the manufacturer's policy. Due to the difficulty of manufacturing flawless panels, most companies require a minimum of 3 to 5 dead pixels in a specific zone before they will honor an RMA replacement.
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