Philips P-Line 43" UHD 4K Digital Signage Display - Manual (Page 38)

43BDL3117P/50BDL3117P/55BDL3117P
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9. Pixel Defect Policy
We strive to deliver the highest quality products and use some of the industry’s most advanced manufacturing processes whilst
practicing stringent quality control. However, pixel or sub-pixel defects on the PDP / TFT panels used in Plasma- & LCD- displays
are sometimes unavoidable. No manufacturer can guarantee that all panels will be free from pixel defects, but Philips guarantees
that any Plasma- & LCD- displays with an unacceptable number of defects will be repaired during the warranty period in line with
your local guarantee conditions.
This notice explains the different types of pixel defects and defines the acceptable defect level for the LCD screen. In order to
qualify for repair under warranty, the number of pixel defects must exceed a certain level as shown in the reference table. If
the LCD screen is within specification a warranty exchange / claim back will be refused. Additionally, because some types or
combinations of pixel defects are more noticeable than others, Philips sets even higher quality standards for those.
9.1. Pixels and Sub-Pixels
subpixel
pixel
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.
9.2. Types of Pixel Defects + Dot Definition
Pixel and sub-pixel defects appear on the screen in different ways. There are three categories of pixel defects and several types of
sub-pixel defects within each category.
Dot definition = What is a defective “Dot”? :
One or more defective, adjacent sub-pixel are defined as one “dot”. The no. of defective sub-pixels are not relevant to define a
defective dot. This means that a defective dot can consist of one, two or three defective sub-pixels which can be dark or lit.
R R G B
One dot = One Pixel; consists of three sub-pixels of Red, Green, and Blue.
9.3. Bright Dot Defects
Bright dot defects appear as pixels or sub-pixels that are always lit or “on”. These are the examples of bright dot defects:
One lit red, green or blue sub pixel Two adjacent lit sub pixels:
Red + Blue = Purple
Red + Green = Yellow
Green + Blue = Cyan (Light Blue) Three adjacent lit sub pixels (one white
pixel)