Acer P244W

- 56 -
III. Circuit operation theory:
A-1.) Interface board diagram:
(a) Circuit operation theory:
A basic operation theory for this interface board is to convert analog signals of Red, Green
and Blue to digital signals of Red, Green and Blue. The scaling IC has internal A/D converter,
internal OSD, built in LVDS transmitter and auto-detect input timing functions. A/D converter
is convert analog signal to digital data. OSD is offering adjustable functions to end-user.
Detect timing is for detect change mode. LVDS transmitter is used to compress the digital
RGB data, the Hsync, Vsync and pixel clock generated by Scaling then output to LCD
module. MCU stores source code and offers H/W DDC2Bi function & controls system
processing. EEPROM is stored DDC and HDCP data, OSD common data and user mode
data.
D_SUB
1920x1080
HDMI1
1920x1080
User
Data&
HDCP
key
RTD2482D
ADC
210Mhz
TMDS
1 Rx
Interface BD
HDMI1
EDID
D-sub
EDID
EEPRO
M
TMDS
2 Rx
HDMI2
1920x1080
HDMI2
EDID
Flash
HDMI
Line Out
To
Ctrl
Board