MNS Digital Photo Frame Pixel Policy

LCD screens is made up of a fixed number of thousands of tiny pixels. A 12.1" flat-screen with a resolution of 1024 x 768 for example, has 786432 pixels. Each pixel comprises three sub-pixels (red, green and blue) so on the 12.1" above, there's 2359296 dots in total. Behind each pixel is a transistor. When a transistor fails it manifests itself as a bright, dark or colored dot on the screen that stands out from the rest.

Today's production techniques unfortunately cannot guarantee an absolutely fault-free screen display and buyers should be aware of the possibility of imperfections (in the form of a few isolated constantly lit or unlit pixels) before choosing to purchase a LCD or Plasma display.

Due to this, there is a industry wide commonly accepted 'tolerance level' by which these kind of displays may have such imperfections (or stuck pixels) without being classified as faulty. Therefore please note that we can only take back displays as faulty for refund/repair if the number of stuck pixels exceeds the manufacturer's guidelines.

For example please see Dells pixel policy policy here  and noting that our pixel policy is higher than Dells!

MNS strives to deliver the highest quality products. However, pixel or sub pixel defects on the TFT LCD panels used in flat panel monitors are sometimes unavoidable. No manufacturer can guarantee that all panels will be free from pixel defects, but we guarantee that any display with an unacceptable number of defects will be repaired or replaced under warranty. This notice explains the different types of pixel defects and defines acceptable defect levels for each type. In order to qualify for repair or replacement under warranty, the number of pixel defects on a TFT LCD panel must exceed these acceptable levels.

Pixels and Sub pixels

A pixel, or picture element, is composed of three sub pixels in the primary colors of red, green and blue. Many pixels together form an image. When all sub pixels of a pixel are lit, the three colored sub pixels together appear as a single white pixel. When all are dark, the three colored sub pixels together appear as a single black pixel. Other combinations of lit and dark sub pixels appear as single pixels of other colors.

BRIGHT DOT DEFECTS ACCEPTABLE LEVEL
 

  1. lit subpixel 3
  2. adjacent lit subpixels 1
  3. adjacent lit subpixels (one white pixel) 0
     
Total bright dot defects of all types 4

BLACK DOT DEFECTS ACCEPTABLE LEVEL
 
  1. dark subpixel 3
  2. adjacent dark subpixels 1
  3. adjacent dark subpixels 0
     
Total black dot defects of all types 4

TOTAL DOT DEFECTS ACCEPTABLE LEVEL

Total bright or black dot defects of all types 4, that is your panel needs to have 4 pixels out or 4 pixels bright (also called Fixed Pixels) to be considered faulty.  Three or more adjacent pixels also qualifies as faulty.

If the panel you have purchased exceeds these defect levels, within the warranty period, please contact us for repair or replacement.