Pixel Defects
There are several types of LCD defects:
- Dead pixel: a defective pixel that remains unlit on an LCD monitor.
- Hot pixel: a permanently lit (white) pixel.
- Stuck pixel: a pixel that stays on a solid color (red, green, or blue).
To standardize the quality of LCD monitors, the ISO 13406-2 defines the number of faulty pixels, although manufacturers can have their own interpretation of this standard (worse), or even give a zero-tolerance policy (better, sometimes referred to as Class 1).
Online Pixel Test
This test shows images which make it possible to detect stuck or dead pixels. The test can be performed Online, or by downloading an mpeg file. Carefully observe your LCD flat screen while the test is running, and make sure the screen surface is cleaned. Click here
Offline Pixel Test (.avi file)
This test shows a movie file, with test images that can be displayed with Windows Media Player, VLC, etc. It works the same as the Online test. Click on the screen resolution below, and play the file using a media player. Double click on the movie file when it's playing to get it full screen. Carefully observe your screen while the test is running, and make sure the screen surface is cleaned. Select your screen resolution: 640x480, 1024x768, 1280x1024