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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.
Types of Sync Signals
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.
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
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.
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.
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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