Insignia NS-28DD310NA15 User Manual page 8

Non-active pixels
The LCD panel contains almost 3 million thin film
transistors, which provide exceptionally sharp video
quality. Occasionally, a few non-active pixels may
appear on the screen as a fixed blue, green, or red
point. These non-active pixels do not adversely
affect the performance of your TV, and are not
considered defects.
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NS-28DD310NA15