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III. Circuit Implementations:
A.)
THE MAIN BODY:
A-1.) Interface board block diagram:
(a) Circuit operations:
The scaling IC has OSD and auto detecting input timing functions. OSD offers adjustable functions to the end-
users. Auto detecting timing function can detect change modes. It outputs the digital R-G-B data, pixel clock
and control signal to TCON of the LCD module. A MCU, build in scaling IC (Realtek2555LH), is responsible for
the system processing. There are two external storing units, one is 24C16 to store the OSD function data and
user preset timings.
(b) IC introduction:
1.)
Realtek2555LH SCALER IC:
Realtek2555LH series products are all-in-one LCD monitor controller with analog (RGB), DVI and video inputs,
supporting UXGA/ WXSGA+WXGA+/SXGA,and integrate Realtek high performance ADC,scaling engine,LVDS
Tx,and so on.Moreover,all products are pin compatible in QFN 48-pin package to save cost and make the
design easier. The RTD also includes an ITU656 video format input port with color space converter that makes
it an attractive solution for low cost MFM and TV applications. The output section contains a 24-bit TTL output
interface and a channel LVDS transmitter for direct interfacing of commercially available LVDS LCD panel
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