52 Chapter8Glossary
Chapter 8 Glossary
Clock
The analog signal input monitor needs to repro duce a clock of the same frequency as the dot clock of the
graphics system in use, when the analog signa l is converted to a digital signal for image display. This is
called clock adjustment. If the clock pulse is not set correctly, some vertical bar s appear on the screen.
DDC/CI (Display Data Channel/Command Interface)
VESA provides the standardization for the i nteractive communication of the setting in formation, etc.
between a PC and the monitor.
DisplayPort
DisplayPort is a next-generation digital AV interface that allows connection of the PC, audio, imagi ng
devices, etc. to the monitor. One cable can transfer sound wit h images.
DVI (Digital Visual Interface)
DVI is a digital interface standar d. DVI allows direct transmission of the PC’s digital data without loss.
This adopts the TMDS tra nsmission system and DVI connectors. There are two t ypes of DVI connectors.
One is a DVI-D connector for digital signal input only. The other is a DVI-I connector for both d igital and
analog signal inputs.
DVI DMPM (DVI Digital Monitor Power Management)
DVI DMPM is a digital interface power saving funct ion. 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, gre en and blue are the three primar y colors. All the
colors on the screen are displayed by combining these th ree 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 nonl inearly with the input signal level, which is called “Gamma
Characteristic”. A small gamma value produc es a low-contrast image, while a large gamma value produces a
highcontrast image.
HDCP (High-bandwidth Digital Content Protection)
Digital signal coding system developed to copy-protect the d igital contents, such as video, music, etc.
This helps to transmit the digita l contents safely by coding the digital contents sent via the DVI or HDMI
connector on the output side and decoding t hem on the input side.
Any digital contents cannot be reprod uced if both of the equipments on the output and input sides are not
applicable to HDCP system.