21

I have pixel on my LCD that appears black only on a blue background; it works fine on other colors.

Black LCD Pixel

Is this a "stuck pixel" or "dead pixel"?

34

Dead.

Stuck is ON, dead is OFF.

Pixels are created from sub-pixels of primary colors, typically red, green, and blue:

enter image description here

The reason the dead spot is visible only when blue is displayed is because it is a blue sub-pixel that is dead. When the background is blue, that is the only color on, and it stands out. When the background is another color, the other sub-pixels reproduce it or it is still bright and absent blue, which is less noticeable.

For example, you can see yellow because it is created from red plus green. A white pixel with a dead blue sub-pixel will produce yellow, which isn't very noticeable in a bright spot that small.

There is a guide at digitaltrends.com for various methods of attempting DIY fixes for stuck or dead pixels - though it must be noted that it's
a) very hit & miss &
b) potentially damaging to the rest of your screen if attempted too enthusiastically.

|improve this answer|||||
  • 1
    and why it only appears on blue and works just fine on red , yellow , white , etc? – Mirkan Mar 13 '15 at 17:04
  • 13
    @Mirkan: Because it is a blue sub-pixel that is dead. When the background is blue, that is the only color on, and it stands out. When the background is another color, the other sub-pixels reproduce it or it is still bright and absent blue, which is less noticeable. – fixer1234 Mar 13 '15 at 17:13
  • 11
    You'd find on white that your dead pixel would actually be yellow [ie, red+green] though it would be hard to spot – Tetsujin Mar 13 '15 at 17:40

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for?Browse other questions tagged or ask your own question.