Dead Pixel Tester (DPT) for Windows is a free software application designed to help users identify dead pixels (stuck pixels that remain a single color, typically black, white, or a bright color) and stuck pixels (pixels that are stuck on a particular color but may change under certain conditions) on their computer monitors or laptop screens.

Here[SQ]s what DPT does :

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Displays solid colors:

It cycles through various solid colors (red, green, blue, white, black, gray, and others) filling the entire screen. This makes it easy to spot pixels that remain a different color than the rest of the screen.
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Highlights dead/stuck pixels:

By displaying these solid colors, DPT makes dead or stuck pixels easily visible. A dead pixel will remain a different color than the background.
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Simple interface:

DPT generally has a very basic and intuitive interface, making it easy to use, even for novice users.
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Fast testing:

The color cycling is usually quick, allowing for a relatively fast screen check.

Essentially, DPT provides a quick and easy way to assess the health of your monitor[SQ]s pixels without needing specialized hardware or complex procedures. If you suspect a problem with your screen, using DPT is a good first step in identifying the issue. Note that while DPT can identify dead pixels, it doesn[SQ]t fix them. Repair or replacement of the monitor may be necessary.