Pixel Defect Policy; Pixels And Sub-Pixels; Types Of Pixel Defects + Dot Definition; Bright Dot Defects - Philips 75BDL3550Q User Manual

75BDL3550Q_86BDL3550Q
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
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
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.
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)
50