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5
LUMA monitors in professional applications
The benefits of reduced reflection characteristics
With CRT monitors, special care has been
required to keep ambient light from reflecting off
the panel glass or CRT phosphors. Studio control
rooms and edit suites must be kept dark to avoid
contrast degradation, and special spotlights
pointed directly at production documents are
required to avoid ghosts appearing on the screen.
Using CRT monitors in ENG and EFP applications
has also been a challenge, requiring special
Accurate white balance
Needless to say, the white balance of a
professional-grade monitor should be as accurate
as possible, not only in the high-light levels but
throughout the entire grayscale range from black
to white. Conventional LCD monitors only allow
adjustment at the brightest light level. This won't
compensate for any inaccuracies in grayscale as
Accurate color reproduction
The R, G, and B sub-pixels of LUMA Series
monitors use carefully selected color filters with
the highest level of purity, to provide a color
gamut extremely close to the color phosphors
Flexible color temperature adjustment
LCD displays use one light source type with a
fixed color temperature. For this reason, one
might think that the color temperature of an LCD
display cannot be adjusted.
LUMA Series monitors allow the adjustment of
color temperature by applying offsets to the driver
Gamma control
In CRTs, the picture brightness and the input
signal voltage have an exponential relationship,
instead of being directly proportional or 'linear'.
The exponent factor used to describe this
relationship is called the CRT's gamma - which is
about 2.2.
The 'raw' relationship between brightness and
input voltage of an LCD is completely different
from a CRT, due to the different mechanism used
to produce pictures.
28
Product Information Manual Sony Professional LCD Monitors
monitor hoods and careful placement of the unit to
avoid sunlight entering the screen.
The LUMA Series monitors reduce such concerns
and bring an innovation into picture monitoring.
And equally important, their panels are slim and
compact, allowing use in bright and space-
constrained office environments. For example,
they are ideal for checking video material on a
busy producer's or director's desk.
the picture changes, especially in the darker
areas.
With the LUMA Series monitors, white balance
can be adjusted at both the low-light and high-
light levels. Having the ability to adjust the white
balance at two points naturally allows the LUMA
Series monitors to provide more accurate white
balance throughout the grayscale range.
used in professional CRT monitors. This largely
contributes to the rich color reproduction of the
LUMA Series monitors.
voltage supplied to each R, G, and B sub-pixel.
Since the aperture of each sub-pixel is controlled
by this voltage, an offset in the color balance will
also occur, allowing different color temperatures
to be produced on the LCD screen.
However, LUMA Series monitors are capable of
providing similar gamma characteristics to a CRT
monitor by controlling the LCD drivers to emulate
a CRT monitor.
With LUMA Series monitors, gamma settings can
be flexibly selected in the same way as a CRT
monitor.
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