BenQ SL490 - Pixel Defect Policy; Pixels and Sub-Pixels; Types of Pixel Defects + Dot Definition

Pixel Defect Policy 83
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 Benq 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 denes 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 specication a warranty exchange / claim back will be refused.
Additionally, because some types or combinations of pixel defects are more noticeable
than others, Benq sets even higher quality standards for those.
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.
Types of Pixel Defects + Dot Denition
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 denition = What is a defective “Dot”? :
One or more defective, adjacent sub-pixel are dened as one “dot”. The no. of defective
sub-pixels are not relevant to dene 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.
RR G B
One dot = One Pixel; consists of three sub-pixels of Red, Green, and
Blue.