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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 (Realtek2545L), 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.)
Realtek2545L SCALER IC:
Realtek2545L series products are all-in-one LCD monitor controller with analog (RGB),
DVI and video inputs, supporting UXGA/ WXSGA+WXGA+/SXGA(optional),and integrate
Realtek high performance ADC,TMDS Rx with HDCP(optional),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
modules. In addition, RTD2545L embedded 16.5KSRAM dynamically stores OSD
command and fonts, compatible advanced color control features.
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