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Chapter 8 Reference
The analog signal input monitor needs to reproduce a clock of the same frequency as the dot clock of the
graphics system in use, when the analog signal is converted to a digital signal for image display. This is
called clock adjustment. ±f the clock pulse is not set correctly, some vertical bars appear on the screen.
Color space is a method to specify and express the color. There are YUV and RGB, etc. YUV expresses the
color by using the luminance (Y), the color difference of R (U) and the color difference of blue (V). RGB
does it by using the gradation of 3 colors of Red (R, Green (G) and Blue (B).
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.
DVI (Digital Visual Interface)
DV± is a digital interface standard. DV± allows direct transmission of the PC’s digital data without loss.
This adopts the TMDS transmission system and DV± connectors. There are two types of DV± connectors.
One is a DV±-D connector for digital signal input only. The other is a DV±-± connector for both digital and
analog signal inputs.
DVI DMPM (DVI Digital Monitor Power Management)
DV± DMPM is a digital interface power-saving function. The “Monitor ON (operating mode)” and “Active
Off (power-saving mode)” are indispensable for DV± DMPM as the monitor’s power mode.
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 Ilter. 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 Ilter.
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
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 the DV± or HDM±
connector 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.