Introduction; Executive Summary - HP 455031-L22 - Intel Quad-Core Xeon 2.13 GHz Processor Upgrade Introduction Manual

Introduction

Liquid crystal display (LCD) technology was first invented decades ago and has
been improving ever since—to the point that today's high-quality flat panel displays
deliver crisp, clear visual quality at a reasonable price. Even so, some LCD monitors
may harbor tiny defects due to the extreme complexity of the manufacturing
process. To deal with these inevitable minor flaws, HP has developed a set of
policies and detection methods to help ensure that each customer receives the
highest quality product available.

Executive summary

Flat panel LCD technology is a complex subject. To help you understand how pixel
and sub-pixel defects occur, and what HP does about them, this white paper
explains:
What are sub-pixels and how do they work? A detailed look will show that
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millions of tiny sub-pixels cover the typical flat panel screen, producing the
mixture of color and detail that forms the sharp, vibrant images flat panel users
have come to expect.
How do pixel and sub-pixel defects occur? The HP specification does not allow
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for any full or complete pixel defects. It does, however, allow for some minimal
sub-pixel defects. This is because the current state-of-the-art in manufacturing
processes still may produce a few sub-pixel defects per screen. These defects
can be extremely hard to see unless they are viewed under special conditions,
or unless they happen to be clustered in groups. Nevertheless, special practices
and policies have been devised to reject any complete pixel defects and
minimize sub-pixel defects.
What is HP doing about it? HP has conducted a detailed study of its standards

for sub-pixel defect specifications, and as a result, has adopted a more
stringent unified standard for all models, which is discussed in greater detail
later in this paper.
Why is this important to me? Doing business with HP gives you the advantage
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of dealing with a company that strives to consistently deliver a higher standard
of quality to its customers. In this case, no full or complete pixel defects, and
fewer sub-pixel defects than most competitors. This means better quality for the
customer and ultimately greater satisfaction for the end user because the user is
viewing a cleaner image without the distraction of pixel defects.
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