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LCD
TECHNICAL INFORMATION:
Digital vs Analog Interface Connections
Currently,
LCD flat panels monitors with analog VGA interfaces dominate
the display market. This has occurred due to the fact that
it is easy to install without having to purchase a new graphics
board. But, with digital LCD displays, there is no need to
adjust clock and phase plus there is the advantage of no lost
signals. What will the future hold for Digital and Analog
connections? Well, VarTech Systems has chosen to offer both
analog and digital connections on the majority of their TFT
LCD displays.
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| Pros
| Cons
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| Digital
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No
Signal losses due to DA and AD conversion
Geometry,
clock and phase settings unnecessary, therefore easier
setup
Lower
Costs as less electronic circuitry required
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Currently
three standards:
P&D (Plug & Display)
DFP(Digital Flat Panel)
DVI (Digital Visual Interface)
Low
availability of models with digital interfaces
Many
conductor Cables
Requires
graphic board with digital output
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| Analog
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Needed
for Gray Scaling
Compatible
with standard VGA boards on a broad installed PC basis
Support
long cable length
Can
be used with a 4 or 5 Wire Setup
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Clock
and phase of the TFTs must be synchronized with the
analog signal to avoid pixel jitter, which is a relatively
complex issue
Cables
sensitive to external influences
More
difficult setup
High
cost of signal conversion inside the display
Upgrade
to digital interface not possible
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In
order for our displays to be compatible with legacy systems
and pc based systems, the majority of our lcd flat panel
displays are offered with both analog and digital connections.
Connections available are:
HD15
- Used to run analog video resolutions including VGA, SVGA
and XGA.
5BNC /
RGBHV - Split the video signal for color into Red,
Green and Blue. It also offers two more cables for horizontal
and vertical sync.
4BNC /
RGB H/V
- Splits the color signal for color into Red, Green and
Blue, but combines the horizontal and vertical sync on a
single cable.
3BNC / RGB - Split the video signal for color into
Red, Green and Blue, and carries the horizontal and vertical
sync on the green. This is referred to as RGB Sync-On-Green.
DB9 - Used to run CGA/EGA with a digital signal,
TTL (Transistor-Transistor Logic), for the transmission
of it's video signal. The TTL signal operates in an "on"
or "off" state only, therefore restricting the
amount of colors displayed. Because of this, it is used
more often in computers running at a low resolution.
5 Pin Mini Din - Used to connect a keyboard to the
display.
RCA / Composite - Used for VCR and stereo
equipment. Often color-coded.
Yellow for video, Red right channel audio, White left channel
audio.
S-video / SVHS - Splits the video signal into two
different components: luminance and chrominance offering
improved performance over the composite cable.
DVI-I29 Pin - Stands for Digital Visual Interface.
Converts the digital signal from the computer to an analog
signal, then converts it back to a digital signal for processing
by the LCD display.
We
also offer HD15 to 5BNC Interface Cable Adapters.
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