Ergotron LUMA - Manual (Page 6)

Separate Type
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Superb Picture Performance
High Purity Color Filters
The separate type LUMA monitors use precisely manufactured
RGB color filters, allowing the reproduction of colors with
stunning depth and saturation – creating highly natural images.
Accurate Gamma and Stable White Balance
- ChromaTRU Color Processing
For an extra level of color reproduction accuracy, every LCD panel
used in the separate type LUMA Series is precisely color calibrated
at the factory, providing consistent characteristics extremely close
to CRT displays.
The colorimetry of an LCD display, by nature, can exhibit
inaccurate R, G, B color coordinates and unbalanced R, G, B
gamma curves, which can make precise color matching between
multiple monitors a challenge. These are also the primary reasons
why LCD color tone can slightly differ from CRTs.
The separate type LUMA monitors solve this problem by precisely
calibrating each LCD panel's light output so that the R, G, B color
coordinates are extremely close to those of a CRT monitor. A
second calibration is further applied so that white balance is
maintained at a consistent color temperature throughout all
grayscale levels.
The result of these precise calibrations is color reproduction
reminiscent of Sony CRT displays.
CIE Color Coordinates
Sophisticated I/P Conversion using X-Algorithm*
All LCD monitors require two processes to map an interlace
signal to the progressive LCD pixel array – I/P conversion and
line scaling. The former converts the interlace signal to a
progressive signal and the latter converts the input signal's
line count to match the LCD pixel array. HD/SD-compatible
monitors use LCD panels with resolutions higher than the SD
signal. This means that the I/P process must be handled with
great accuracy to keep its effect to a minimum after the line
scaling.
Conventional LCD monitors conduct the I/P conversion simply
by combining two adjacent picture fields into one picture
frame. This method is effective for static areas of the image,
but can often result in jagged shape noise along the oblique
direction of fast-moving objects.
To avoid this, the separate type LUMA models incorporate
Sony's original X-Algorithm technology, which uses a picture-
adaptive Still Mode and Motion Mode for the I/P conversion.
By examining the pixels in preceding fields, the I/P conversion
will operate in either Still or Motion Mode. For pixels where
motion is not detected, the I/P conversion will simply copy
pixels from the preceding field to create the absent scanning
line.
In contrast, when motion is detected, picture frames are
created from the interlace signal on a field basis by
interpolating the missing pixels of every other line.
X-Algorithm intelligently examines a significant area
surrounding the missing pixel and uses the most logical pixels
above, below, or in the diagonal direction of the moving
picture part to insert a natural scanning line.
The direct result of X-Algorithm – much smoother image
reproduction for both still and moving areas of interlace SD
signals.
* X-Algorithm is not used for HD signal input.
Excellent Brightness and Contrast
While conventional LCD monitors can tend to be dark, the
separate type LUMA monitors provide high-brightness and high-
contrast images by use of super-wide aperture LCD panels.
Extremely Wide Viewing Angle
The separate type LUMA monitors offer the most stable
images within the LUMA Series when viewed from various
angles. They offer a wide viewing angle of 170 degrees,
horizontally and vertically, with virtually no reduction in
picture contrast, color saturation, and hue shift. This allows
precise images to be clearly viewed from various positions and
angles – a critical requirement in professional video
monitoring.
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0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
v'
u'
CRT
LCD
Green
Yellow green Yellow
Orange yellow
Orange
Red
Moderate red
Dark skin
Light skin
Whlite
Foliage
Bluish green
Magenta
Blue flower
Blue sky
Cyan
Purple
Purplish blue
Blue
CRT (Sony CRT) LCD (Sony LCD Panel)
ChromaTRU
Sony LCD panel
Sony CRT
The CIE u’ v’ chart is used to evaluate the light output of display
devices. In this diagram, the raw light output of a Sony LCD panel is
compared with that of a Sony CRT. The triangular areas show their
different color reproduction capabilities (Color Space). The green and
red dots indicate the color of light output from a Sony LCD panel and
that from a Sony CRT for certain RGB input signals. Note that the
same light color is not obtained for the same video input. The
ChromaTRU process, on the other hand, reproduces consistent light
output extremely close to that of a CRT.
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