Dead Defective Pixels

An article about what dead pixels are and how to get rid of them.

What are they:

Defective pixels are pixel on a LCD that are not performing as expect. There are three main types of distinguishing types that are widely recognized but hardware companies have more. Essentially a defective pixel is a pixel that is not working properly.

You may have defective pixels in image sensor like a camera which fail to sense light properly and therefore making that camera’s picture look weird or not work at all

Types:

There are three main types of defective pixels but before I tell you about them you have to understand the concept of a sub-pixel. A pixel is made up out of 3 different sub-pixels one red, one green, and one blue. These sub-pixel make up the color of a pixel.

  • type 1 = a hot pixel always on, meaning that they will appear white
  • type 2 = a dead pixels are always off, meaning that they will appear black
  • type 3 = a stuck pixel has one or more sub-pixels are always on or always off

-Stuck pixels:

A stuck pixel is a bright dot of colour most noticeable when the rest of the screen is black. Stuck pixels are fairly common on high resolution LCD screens. Stuck pixels sometimes start working again with time unless they appear black on a white background, these are known as dead pixels.

-Dead Pixels:

With a dead pixel, all three sub-pixels are permanently off, making the pixel produce a permanent a permanently black pixel. Dead pixels can result from similar manufacturing anomalies as stuck pixels, but may also occur from a non-functioning transistor resulting in complete lack of power to the pixel. Dead pixels are much less likely to correct themselves over time or be repaired throughany simple methods

-White Pixels:

With pixels that are always on it is easiest if you turn the screen black by veiwing a black image full screen. These pixels have a  transistor that is not working.

Removal:

Unfortunately you cannot remove a dead pixel without sending the screen to a manufacturer and having them fix it BUT you can fix stuck pixels. There is a wiki related to fixing these pixels, here is the link. If you don’t want to click the link then the best and safest method is to use Pixel Cleaning Software to clean your screen by flashing random colors. this works because their is a chance that a pixel might be re-energized. Link to software.

I have written about my friends experience with pixel problems, it is a funny story about him and his laptop. Here.

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