JVC DLA-G20, Sales Manual

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n
S-XGA resolution = 1280 x 1024 dots
XGA resolution = 1024 x 768 dots
There doesn’t seem to be any noticeable difference.
Actually,
n
S-XGA (D-ILA)
1280 x 1024 = 1,310,720
1,310,720 x 3 plates = 3,932,160 dots
n
XGA
1024 x 768 = 786,432
786,432 x 3 plates = 2,359,296 dots
3,932,160 ÷ 2,359,296 x 100 =
166.7%
In terms of the total number of dots (or pixels), S-XGA
resolution is 1.7 times that of XGA. The difference in
image precision, smoothness and brilliance can be
clearly seen.
1280
1024
1024
768
13
●
The term “S-XGA equivalent” indicates compression and
data loss. Actual resolution is determined by the
capabilities of the LCD panel. The maximum possible
resolution with an LCD-based system is XGA (1024 x 768
dots).
A 1024 x 768-dot LCD panel projects an “S-XGA
equivalent” image, by compressing and attenuating S-XGA
1280 x 1024 signals.
●
Compression affects the thickness of the lines that make
up the picture, making the lines less clear. Attenuation
eliminates some lines altogether.
●
Because the D-ILA device has an inherent resolution of
1365 x 1024 dots, the D-ILA projector is able to reproduce
S-XGA resolution in full without compression or data loss.
This fact should be emphasized as a key sales point.
D-ILA Method Present Condition and Subject
12
What is the difference between the D-ILA projector’s
“true S-XGA” capability and “S-XGA equivalent” capability
offered by other projectors?
10 24 10 24
10 24
1280
1365
600
800
1280
10 24
768
1280
Fig. 1 Fig. 2 Fig. 3
Making the
resolution
higher
D-ILA resolution
S-XGA is a high-resolution display mode used by personal
computers with resolution of 1280 x 1024 pixels. Because
the D-ILA device features built-in resolution of 1365 x 1024
pixels, it can project an image with full S-XGA resolution
without compression or data loss. This is what we mean
by “true S-XGA”. (Fig. 1)
The term “S-XGA equivalent”, on the other hand,
does not describe a “true” S-XGA picture. Instead, it
refers to projected image that is processed so that it
resembles an S-XGA picture. Since LCDs in most LCD
projectors can reproduce either 800 x 600 (S-VGA) pixels
(Fig. 2) or 1024 x 768 (XGA) pixels (Fig. 3), they are
unable to handle all 1280 x 1024 pixels in an S-XGA
display. Therefore, in order to project S-XGA signals, LCD
projectors must compress or “thin out” the image data.
This means that though the image may appear similar to
an S-XGA image, it is not a true “S-XGA” image, since the
projector is incapable of displaying the full S-XGA
resolution.
Unfortunately, because many people are unaware
of the difference between “true S-XGA” and “S-XGA
equivalent”, they can easily be misled about the true
performance characteristics of a projector.
Resolution is a scale for measuring the precision of the
display. With a personal computer display, resolution is
expressed by the number of dots or pixels used in the
horizontal and vertical directions of the screen. For
example, S-XGA is expressed as 1280 x 1024. The
higher the numeric value, the higher the resolution. And
the higher the resolution, the more precise the picture
projected. If someone says that they do not need such
high resolution, it is usually because their computer does
not have high resolution display capability. However, rapid
advances in personal computer technology will soon result
in S-XGA becoming commonplace. By choosing a
projector with the highest possible resolution, you can
ensure that it won’t be rendered obsolete the next time
you upgrade your computer.
Is high resolution really necessary?
D-ILA multimedia projector (Quick Facts)
Outstanding S-XGA full resolution
There is a big difference between “full S-XGA resolution”
(D-ILA) and “S-XGA equivalent”.
D-ILA resolution