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Sony SRX-R220 Brochure page 9

4k digital cinema projectors
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SXRD Technologies
In addition to their extreme resolution and high contrast, the
SXRD devices used in the SRX series projectors have the
following remarkable technological features:
Vertically Aligned Liquid Crystal
System
In every type of projector system, displaying absolute black
is a major issue in order to achieve a high contrast ratio.
In other words, the contrast ratio of a projector depends on
how effectively the light from the source can be blocked so it
does not leak through the imager.
All Liquid Crystal on Silicon (LCOS) devices control the
amount of light to be projected by applying an electric field
to the crystal gap. In typical LCOS devices, black is
produced when an electric field is applied across the cell
gap. However, molecules near the surface of the glass
substrate may not be accurately controlled due to the
influence of the alignment film. This is not an issue for
bright images. However, when displaying dark images, light
may tend to leak from the LCOS device, since the molecules
near the surface are less accurately controlled. This results
in a creamy black instead of a deep black.
The SXRD device does not exhibit these characteristics. This
is because the Vertically Aligned Liquid Crystal system
displays black when
the electric field is
not applied and
SXRD Cross-Section view
SXRD Cross-Section view
because all
molecules are in the
correct alignment,
with no charge
applied. The direct
result is a far deeper
black level, leading
to a high contrast
ratio.
Glass Substrate
Vertically Aligned Liquid Crystal
Silicon Backplane
High-Density Pixel Pitch 8.5 μm
• 4 x Full-HDTV (4096 H x 2160 V pixels)
Thin Crystal Cell Gap
Another important enabling factor of high contrast is the
SXRD device's ultra-thin cell gap which is less than 2
micrometers thick. In conventional Vertically Aligned Liquid
Crystal systems, a thin cell gap could not be achieved. Sony
has overcome this difficulty through the use of Sony's
innovative planarization technology in the silicon backplane
structure and an advanced Silicon wafer-based assembly
process.
The SXRD device also adopts a cell structure that does not
use "spacers". These are columns found in conventional
LCOS devices to maintain a constant gap between the cell
floor and the top of the device. Spacers tend to both scatter
and reflect light, which can impair high-contrast pictures. In
the spacer-less SXRD device, these artifacts are no longer
visable.
Short Response Time
The thin cell gap structure in SXRD devices also contributes
to an ultra-fast response time of 5 milliseconds. The SXRD
device reacts promptly to an instantaneous change of picture
content, enabling it to display smooth and natural motion.
Consequently, the SRX-R220 and SRX-R210 virtually
eliminate motion blur; a particularly significant benefit for
visual content that includes fast-moving objects.
Reliable Imaging Device
The SRX-R220 and the SRX-R210 use a very high-power
lamp. As a result, special attention has been paid to the
reliability of the SXRD device. The inorganic materials
utilized for the alignment layer of the SXRD imager are
resistant to deterioration or deformities that could occur due
to the intense heat and light generated by using a large lamp
system.
Thin Cell Gap (2.0 μm) Space-less
Light
• Short response time < 5 msec
• High Device Contrast ratio 4000 : 1
Inorganic
Alignment Layer
• High reliability
Aluminium Pad
Narrow Inter-Pixel
Spacing (0.35 μm)
• High fill factor 92 %
• High reflectivity
9

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