Dark mode exposes a stuck pixel: what to check

You switch on dark mode and notice a tiny bright dot that was easy to miss before. It may be a stuck pixel, but a mark on a dark screen is not proof that the display is damaged.

Use solid colors to check whether the dot stays in the same place and changes with the background. The Display Test can help you inspect the screen, then you can decide whether to adjust a setting, try a brief pixel recovery test, or contact the device maker.

Check the pixel with solid colors

1. Open the Display Test on the screen where you see the dot.
2. Show solid dark and light colors, then red, green, and blue if available. Look for the same pinpoint mark in each view. Avoid judging it over a detailed image or a patterned background.
3. Check whether the mark stays in exactly the same position as the colors change. If you use an external monitor, run the test on that screen too, rather than assuming the laptop panel and monitor share the same issue.
4. Take a screenshot while the dot is visible, then view that screenshot on another display. A physical pixel fault will not be recorded in the screenshot. If the dot appears in the screenshot on another screen, look for a software or image issue instead.

Do not press, rub, or tap the screen to try to change the pixel. Pressure can damage the panel or create new marks.

What the result means

A bright dot stays in the same place on dark colors

A red, green, blue, or white pinpoint that remains lit against a black or dark background may be a stuck-on subpixel. A subpixel is one of the tiny red, green, and blue parts that combine to make a pixel. Dark mode can make this easier to notice because the surrounding areas are dark. It does not mean dark mode caused the fault.

A dark dot stays in the same place on light colors

A dot that remains black or very dark on white and other bright colors may have a subpixel that is not lighting. People often call this a dead pixel, although displays can have several kinds of pixel fault. For a closer comparison, see stuck pixel vs. dead pixel.

The mark changes, moves, or disappears

If it shifts when you move a window, appears only in one app, or is also visible in a screenshot on another screen, it may be part of the image, a cursor or overlay, or a graphics issue rather than a faulty panel pixel. Restart the app and compare with a plain background before concluding the display is damaged.

The mark appears only on one physical display

If the dot stays at the same physical spot on one screen through several colors, but does not appear in a screenshot, the panel is the likely source. A browser test cannot inspect the panel electronics directly, so use the result as evidence, not a definitive hardware diagnosis.

What to try next

1. Check that it is not on the surface. View the screen from a slightly different angle and gently clean it with a soft, dry microfiber cloth. Do not push on the panel. A speck on the glass may look like a pixel, but it will not change color with the test background.
2. Compare with dark mode off. On Windows 11, open Settings › Personalization › Colors and choose a light mode. On a Mac, open System Settings › Appearance and select Light. On an iPhone, go to Settings › Display & Brightness. On Android, look under Settings › Display for Dark theme or a similarly named option. Menu names can vary by phone maker. Changing the theme is a comparison, not a pixel repair.
3. Restart the device and repeat the check. This can rule out a temporary graphics or app glitch. If you use an external monitor, disconnect and reconnect its cable, then test again. A cable problem more often causes broader flickering, lines, or dropouts than one fixed pixel.
4. Try a brief pixel recovery test only if the dot looks stuck on. The Stuck Pixel Fixer rapidly flashes colors in an attempt to free a stuck pixel. Stop if the flashing is uncomfortable, and do not leave it running unattended. It cannot repair a dead pixel or guarantee a result. For more context, read whether flashing colors can fix a stuck pixel.
5. Check the display maker's warranty terms. Manufacturers set their own rules for how many defective pixels qualify for service, and some distinguish between bright and dark pixel faults. Keep a photo of the test result and note the screen model and purchase date before contacting support.

When it is probably a hardware defect

A single dot that remains fixed in the same physical position through several solid colors, survives a restart, and does not show up in screenshots is strong evidence of a panel issue. If it is a new device, ask the seller or manufacturer about the return period and pixel policy before trying anything that could affect coverage. For an older screen, compare the cost of repair with replacement. Laptop and phone panels usually need professional service rather than a software fix.

Why dark mode makes the dot stand out

A bright pixel has strong contrast against a nearly black background, so it draws your eye. On an LCD, the display uses a backlight even when showing dark areas. On an OLED screen, black areas are made by switching pixels off, which can make a subpixel that remains lit especially noticeable. Neither display type is damaged simply by using dark mode.