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Sync Signal
Sync (Synchronized) Signals refer to the standard signals that are required to display desired colors on
the monitor. They are divided into Vertical and Horizontal Sync Signals. These signals display normal
color images by the set resolution and frequency.
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Types of Sync Signals
Terms
Regulatory
Natural Color
For Better Display
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Dot Pitch
The image on a monitor is composed of red, green and blue dots. The closer the dots, the higher the
resolution. The distance between two dots of the same color is called the 'Dot Pitch'. Unit: mm
Vertical Frequency
The screen must be redrawn several times per second in order to create and display an image for the
user. The frequency of this repetition per second is called Vertical Frequency or Refresh Rate. Unit: Hz
Horizontal Frequency
The time to scan one line connecting the right edge to the left edge of the screen horizontally is called
Horizontal Cycle. The inverse number of the Horizontal Cycle is called Horizontal Frequency. Unit: kHz
Interlace and Non-Interlace Methods
Showing the horizontal lines of the screen from the top to the bottom in order is called the Non-Interlace
method while showing odd lines and then even lines in turn is called the Interlace method. The Non-
Interlace method is used for the majority of monitors to ensure a clear image. The Interlace method is
the same as that used in TVs.
Plug & Play
This is a function that provides the best quality screen for the user by allowing the computer and the
monitor to exchange information automatically. This monitor follows the international standard VESA
DDC for the Plug & Play function.
Resolution
The number of horizontal and vertical dots used to compose the screen image is called 'resolution'. This
number shows the accuracy of the display. High resolution is good for performing multiple tasks as more
image information can be shown on the screen.
RF Cable
A round signal cable generally used for TV antennas.
Satellite Broadcasting
Broadcasting service provided via satellite. Enables high picture quality and clear sound throughout the
country regardless of the location of the viewer.
Sound Balance
Balances the levels of the sound coming from each speaker in televisions with two speakers.
Cable TV
Whereas the terrestrial broadcasting is delivered via frequency signals through the air, cable
broadcasting is transmitted via a cable network. In order to view cable TV, one must purchase a cable
receiver and hook it up to the cable network.
CATV
"CATV" refers to the broadcasting service offered at hotels, schools and other buildings through their
own broadcasting system, apart from VHF or UHF broadcasting by terrestrial broadcasters. The CATV
programs may include movies, entertainment and educational programs. (Different from cable TV.)
CATV can be viewed only within the area in which the CATV service is offered.
Separate
This is a scheme of transmitting individual vertical sync signals to the monitor.
Composite
This is a scheme of combining vertical sync signals into one composite signal
and transmitting it to the monitor. The monitor displays the color signals by
separating the composite signal into original color signals.
Sync On Green
This scheme does not use sync signals. Instead, it combines horizontal and
vertical sync signals into a Green signal and transmits to the monitor. It is mainly
used for workstations.
Example: If the same light repeats itself 60 times per second, this is regarded as 60 Hz. In this case,
flickering of the screen can be detected. To avoid this problem, there is a Flicker-free Mode
using a vertical frequency over 70 Hz.
Example: If the resolution is 1024 X 768, this means the screen is composed of 1024 horizontal dots
(horizontal resolution) and 768 vertical lines (vertical resolution).
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