Appendix – LCD Display Pixel Policy
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Appendix – LCD Display Pixel Policy
Dark pixel anomaly: A dark pixel anomaly is defined as a pixel or
subpixel that is always dark or ‘off’. The dark pixel anomaly will
always be dark and will not show any color.
Standard Pixel Policy
Digital Foci warrants that any LCD display with an unacceptable
number of pixel anomalies will be repaired or replaced. To
qualify for repair or replacement under warranty, the number
of pixel anomalies on the TFT LCD panel must exceed these
industry standards.
Pixel Policy Standards Chart
Anomaly Type
# of anomalies
Bright pixel
2
Dark pixel
3
Any combination of bright and dark pixels
4
Technical Support
If you notice your display contains more than the number of
pixel anomalies as stated on the above chart, please contact
Digital Foci, Inc. tech support at
support@digitalfoci.com
11. Appendix – LCD Display Pixel Policy
This section defines the different types of pixel anomalies seen
on LCD displays, explains why such anomalies occur, and states
standard pixel policy for warranty service. In order to qualify
for repair or replacement under warranty, the number of pixel
anomalies on your LCD panel must exceed these industry
standards.
Why Pixel Anomalies Occur
Active-matrix LCD technology uses rows and columns of
addressable locations (pixels) that render text and images
on the display. Each pixel location has three subpixels in the
primary colors of red, green, and blue that allow the image to
be rendered in full color. Each subpixel has a corresponding
transistor responsible for turning the subpixel on and off.
The standard of production techniques for LCD manufacturing
today cannot guarantee an absolutely fault-free display. During
the production process, it is not uncommon for one or more
pixels to be fixed in an unchanging state. The visible result is a
pixel or subpixel with a fixed color that does not change or one
that is dark and does not light at all. In most situations, these
fixed pixels are unnoticeable and do not detract from the display
quality or usability.
Types of Pixel Anomalies
There are two types of pixel anomalies: bright pixel anomaly and
dark pixel anomaly.
Bright pixel anomaly: A bright pixel anomaly is defined as a pixel
or subpixel that is always lit or ‘on’. The bright pixel anomaly will
constantly show as red, green, blue, or white.
