48 Chapter 5 Reference
5-6 Glossary
Clock
The analog input monitor needs to reproduce a clock of the same frequency as the dot clock of the graphics system in
use, when the analog input signal is converted to a digital signal for image display.
This is called clock adjustment. If the clock pulse is not set correctly, some vertical bars appear on the screen.
DDC/CI (Display Data Channel/Command Interface)
VESA provides the standardization for the interactive communication of the setting information, etc. between a PC
and the monitor.
DisplayPort
VESA provides the digital interface standard for the digital display device. DisplayPort can transfer the video signal
up to 16 bits for each channel of RGB, and the audio signal too. (This monitor supports the 8-bit video signal only.)
DVI (Digital Visual Interface)
DVI is a digital interface standard. DVI allows direct transmission of the PC’s digital data without loss.
This adopts the TMDS transmission system and DVI connectors. There are two types of DVI connectors. One is
a DVI-D connector for digital signal input only. The other is a DVI-I connector for both digital and analog signal
inputs.
DVI DMPM (DVI Digital Monitor Power Management)
DVI DMPM is a digital interface power-saving function. The “Monitor ON (operating mode)” and “Active Off
(power-saving mode)” are indispensable for DVI DMPM as the monitor’s power mode.
Gain
This is used to adjust each color parameter for red, green and blue. An LCD monitor displays the color by the light
passing through the panel color lter. Red, green and blue are the three primary colors. All the colors on the screen
are displayed by combining these three colors. The color tone can be changed by adjusting the light intensity (volume)
passing through each color’s lter.
Gamma
Generally, the monitor brightness varies nonlinearly with the input signal level, which is called “Gamma
Characteristic”. A small gamma value produces a low-contrast image, while a large gamma value produces a high-
contrast image.
HDCP (High-bandwidth Digital Content Protection)
Digital signal coding system developed to copy-protect the digital contents, such as video, music, etc. This helps
to transmit the digital contents safely by coding the digital contents sent via DVI terminal on the output side and
decoding them on the input side.
Any digital contents cannot be reproduced if both of the equipments on the output and input sides are not applicable
to HDCP system.
Overdirve
This technology enhances response speed by increasing the potential difference at the time of motion of liquid-crystal
pixels, and it is used for liquid-crystal TV sets and others in general. It provides clear-cut three-dimensional display
with little image lag, by improving response speed of the intermediate graduation range that frequently appears in
moving images.
Phase
Phase means the sampling timing to convert the analog input signal to a digital signal. Phase adjustment is made to
adjust the timing. It is recommended that phase adjustment be made after the clock is adjusted correctly.