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Comparison between conventional projectors and the DLA-HD1
The secret behind the exquisite, film-like picture quality with 15,000:1 native contrast ratio lies in the
innovative D-ILA device technology, the optical engine and the fact the DLA-HD1 projector does not rely on
iris control. Conventional front projectors use an iris control to boost contrast ratio. With such projectors,
picture resolution may be excellent, but the picture lacks good contrast. Here you can see the difference
between a conventional projector with iris control and JVC's DLA-HD1.
Conventional Projector
2000:1
~5000:1
15000:1
For bright scenes
the iris is opened,
Iris off
Iris on
making peak values
brighter, but at the
Lamp
Lamp
same time blacks
beam
beam
are lighter than they
should be.
Newly developed 0.7-in. full HD D-ILA device
Conventional D-ILA devices suffer from surface unevenness, minute gaps and irregularities that are unavoid-
able using normal semiconductor manufacturing processes. Discontinuities between individual pixel cells or
where the pixel cells are connected with the underlying semiconductor structure disturb the orientation of
the liquid crystals, and the resulting diffraction and other effects lead to stray light. In the manufacture of this
newly developed device, technology has been adopted to ensure extreme planarization; this reduces to an
absolute minimum such stray light.
Moreover, as a result of employing new liquid crystal materials and orientation technologies, the gap
between pixel cells has been optimized, reducing it from the previous 3.2 microns to 2.3 microns, cutting
light loss from the liquid crystal layer itself, and significantly improving compensation accuracy. Such new
technologies have realized the extremely high device contrast ratio of 20,000:1, and at the same time
halved response time from 8msec (Tr+Td) to 4msec.
VIA, poor orientation
near pixel cell boundaries
Liquid crystal
molecules
Oriented film
Pixel electrode
VIA
Pixel element
Pixel element
T e c h n o l o g i e s
DLA-HD1
15000:1
For dark scenes
the iris aperture is
reduced, causing
The newly developed 0.7-in.
blacks to appear
full HD D-ILA device can display
darker but at the
peak whites and deep blacks
same time peak val-
on the same screen.
ues are also darker.
Poor orientation in
flat areas
Conventional device
contrast ratio: 5,000:1
Gap
Planarization,
between
new orientation
pixels
technology,
new liquid crystals
New device
contrast ratio: 20,000:1
Gap
between
pixels
i n
D e t a i l
Professional-standard grayscale performance
JVC's original D-ILA pulse drive produces clear, high-precision gradations without employing error diffusion.
High-precision calibration technology enables the faithful reproduction of dark pictures, in which luminance
is 10% or less, so that the blacks can still be differentiated, thus resulting in pictures with appreciable texture.
Grayscale comparison
Superb grayscale performance
New optical engine with wire-grid polarizers
Using a conventional PBS (Polarizing Beam Splitter),
comprised of a glass prism with multilayer interference
film, optical properties can vary considerably depending
on the angle of the incident light beam; this makes it
difficult to realize high contrast.
However, the wire grid design employed for JVC's newly
developed optical engine uses an inorganic reflective
polarizing plate made from a glass substrate on the
surface of which are ultra-fine aluminum ribs. This
reduces to an absolute minimum the amount of stray
light reaching the lens.
The combination of this
Projection lens
polarizer with the newly
Cross prism
Light source
developed D-ILA device
increases contrast by a
Block prism
factor of 5.
D-ILA
New optical engine with wired-grid polarizers
GF9351 video processor from Gennum Corporation
The GF9351 video processor made by Gennum Corporation ensures the faithful reproduction of
high-quality images thanks to a high-precision scaling function and four VXP™ technologies
— FineEdge™, FidelityEngine™, TruMotionHD™ and RealityExpansion™.
Four VXP™ Technologies
FineEdge™
E dge correction technology that gets rid of the jaggy
artifacts that can affect diagonal lines, creating instead
smooth outlines.
FidelityEngine™
Imaging technology that improves detail while reducing
noise. This technology ensures a clear, detailed picture even
when using video sources with lower resolutions.
VXP and Visual Excellence Processing are trademarks of Gennum Corporation.
Poor grayscale performance
Reflected polarized light (S)
Glass substrate
Non-polarized light
Transmitted
polarized light (P)
Aluminum ribs
How the wire-grid polarizer works
Wire-grid
Enlarged photo of the wire-grid
polarizers
TruMotionHD™
D e-interlacing technology that supports HD signals
(1080i), converting them to high-quality 1080p signals for
playback.
RealityExpansion™
1 0-bit image processing technology. This technology can
upsample 4:2:2 (Y:Cb:Cr) video signals to the 4:4:4
format; it delivers outstanding image processing at a level
comparable to that of broadcast masters.
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