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Panel technologies
innovative technologies for the best
image reproduction
One of the most important aspects of a public display is the LCd panel, since
the quality of the panel largely determines the overall quality of the product.
The design and construction of the public display needs to be as professional
as possible in order to achieve the best possible panel operation. NeC
display Solutions therefore places the greatest importance on, for example,
the thermal design of the display.
LCd panels differ primarily between those technologies that have been
designed for standard flat-screen TVs and those that have been optimised for
deployment in public displays. The differences lie in the structure of the panel
and the particular liquid crystal that is used.
Structure of the LcD panel
different LCd panel structures differ with regard to the layers composing the
panel and their relative positioning. An additional layer is often interposed in
public display panels in order, for example, to protect the panel from the heat
arising out of the backlight or to improve the distribution of the heat.
Flat-screen TV panel –
high temperature due to
uneven heat distribution
Public display panel –
low temperature due to
uniform heat distribution
Likewise, the distance between the panel and backlighting can also be
increased so as to minimise detrimental thermal effects, which can lead to a
slightly increased depth of the panel and display.
A reduction in heat or alternatively a more uniform distribution of the heat has
a positive effect on, for example, image retention effects ("burn-in") and the
lifetime of the backlight.
The special structure of the public display panel guarantees problem-free
operation of the display in portrait-mode installations – increasingly common
in the digital signage sector. Flat-screen TV panels have been designed to be
used in landscape mode and so can develop problems over time when they are
used in portrait mode. This is because certain layers and their arrangements
within flat-screen TV panels have been optimised only for landscape operation,
and so can start warping or distorting whilst in portrait mode.
A further frequent distinguishing feature of professional LCd panels is the seal
employed to protect them against dust. (See also page 12).
in addition, the use of alternative liquid crystals in combination with the lower
panel temperature is effective in reducing the formation of image retention
("burn-in") and other degradations in the picture quality, such as regions of
brightness or darkness ("mura").
Not all the measures mentioned here are necessarily applied to a single public
display LCd panel. Furthermore, the panels are being continually improved
and optimised, so that only a selection of their most important distinguishing
features can be detailed here. However, the technology details mentioned
here clearly set professional public display panels apart from standard flat-
screen TV panels when it comes to reliability and durability.
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