Philips BDL3215E/00, Service Manual

Page: 31 / 188

31
4.3 Pixel Defect Policy
Philips strives to deliver the highest quality products. We use some of the industry’s most advanced manufacturing
process and practice 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 Plasma- & LCD-display with an unacceptable number of defects will
be repaired or replaced under warranty Period in line with your local guarantee conditions. This notice explains the
different types of pixel defects and defines acceptable defect level for the BDL3215E/BDL4225E LCD screen. In
order to qualify for repair under warranty, the number of pixel defects must exceed a certain level which is given 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.
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 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 signal black pixel. Other
combinations of lit and dark sub-pixels appear as single pixels of other colors.
Types of Pixel D 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.
Bright Dot Defects = what is a defective “Dot”?
One or more defective, adjacent sub-pixel is defined as one “dot”. The no. of defective sub-pixels is 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.
One dot = One Pixel; consists of three sub-pixels of Red; Green and Blue
subpixel
subpixel
R G B
R G B
subpixel
pixel
R G B