Bright subpixels on a graphics tablet display

A tiny red, green, blue, or white dot can stand out on a graphics tablet, especially when you are drawing or checking color. First find out whether the mark stays in the same place across different colors, or appears only in one app or layer.

The Display Test helps you inspect solid colors and look for pixel defects. If a subpixel seems stuck on, the Stuck Pixel Fixer can flash colors over the affected area, but it may not work and is not a repair for a physically damaged panel.

Check the bright dot

1. Open the Display Test and show a plain color on the graphics tablet display. Check a few different colors, including black, white, red, green, and blue.
2. Look closely at the same spot on each color. Note whether it stays bright, changes color, disappears, or looks dark against a bright background.
3. Close your drawing app and any floating panels, then check the screen again. If possible, test a different app or input source too.
4. Clean the screen gently with a clean microfiber cloth, then repeat the check. Do not press or rub hard on the spot.

Keep the test pattern on the display itself, not just inside a small window. If the spot is near an edge, make sure it is not a cursor, selection handle, screen overlay, or mark on the protective film. For a broader inspection routine, see How to check a graphics tablet display for defects.

What the result means

The dot stays bright on every color

A subpixel or a whole pixel may be stuck on. A pixel is made of tiny red, green, and blue subpixels. If one subpixel stays lit, the dot often appears colored. If all three stay lit, it can look white. The browser test can help you see the symptom, but it cannot inspect the panel circuitry or confirm the exact cause.

The dot is dark on bright colors

This can be a dead subpixel, which does not light when it should, rather than a bright stuck one. A flashing pattern is unlikely to repair a dead subpixel. Record what you see and check the tablet's return or warranty terms.

The dot changes or disappears with the test color

The subpixel may be responding normally, or the mark may come from the image, app, cursor, or a temporary display effect. Repeat the test after restarting the app and checking a different input source before concluding that the panel is faulty.

The mark appears only in one app

The panel may be fine. Hide the app's panels, turn off any brush cursor or selection outline, and open a different image. If the mark follows a document or layer rather than its screen position, inspect that file instead of the display.

How to fix it

1. Rule out a mark on the surface. Turn the display off and wipe it lightly with a microfiber cloth. If the mark moves or comes off, it was on the surface, not a subpixel. Avoid liquid cleaner unless the device maker says it is safe for that screen.
2. Check another app or input. On a graphics tablet with a video input, switch to another source or connect it to another computer if available. If the dot stays at the same physical screen position across sources, the panel is more likely to be responsible.
3. Restart the display and computer. Disconnect and reconnect the display cable if it is external, then restart the computer. This can clear a temporary graphics or connection issue, although it will not repair a damaged subpixel.
4. Check the display mode. On Windows 11, open Settings › System › Display. On macOS, open System Settings › Displays. Confirm that the tablet is detected and using a supported resolution. A mode change may help with an image problem, but it will not change a physical pixel defect.
5. Try the Stuck Pixel Fixer only for a stuck pixel. Open the Stuck Pixel Fixer and use its flashing pattern over the affected area for a short session. The tool attempts to prompt a stuck subpixel to change state. Stop if the flashing is uncomfortable, and do not use it if you are sensitive to flashing light or have a photosensitive condition.
6. Check the warranty before doing more. If the dot remains after these checks, contact the tablet maker or seller and ask how they handle pixel defects. Avoid pressing on the screen or opening the device, since pressure can cause further damage and may affect warranty coverage.

When the display needs service

A defect that remains in the same position on solid colors, in different apps, and across available input sources is strong evidence of a panel issue. Take a photo that shows the dot against a plain color, note the screen position, and keep the purchase information. The manufacturer can explain whether the defect meets its replacement policy. If the tablet is outside warranty, ask a repair shop about panel replacement and compare the cost with replacing the display.

What the pixel fixer can and cannot do

The Stuck Pixel Fixer rapidly changes colors in an area of the screen. This may help a subpixel that is stuck in one state, but results are not guaranteed. It cannot repair a dead subpixel, a cracked panel, a damaged display cable, or a graphics problem that draws a dot into the image.

Keep the affected point in view while the pattern runs, and use the timer rather than leaving a flashing pattern on for a long time. If the dot does not change after a brief attempt, stop and use the display's warranty or repair process instead of repeating prolonged flashing sessions.

The Display Test and Stuck Pixel Fixer show patterns in your browser. They do not change the graphics tablet's hardware or prove that a panel will remain fault-free.