Akai LCT-4216, Service Manual

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PRELIMINARY / CONFIDENTIAL
PW181
Product Specification
General Description
The PW181 ImageProcessor is a highly integrated
“system-on-a-chip” that interfaces computer graphics and
video inputs in virtually any format to a fixed-frequency flat
panel display.
Computer and video images from NTSC/PAL to WUXGA
at virtually any refresh rate can be resized to fit on a fixed-
frequency target display device with any resolution up to
WUXGA. Video data from 4:3 aspect ratio NTSC or PAL
and 16:9 aspect ratio HDTV or SDTV is supported. Multi-
region, nonlinear scaling allows these inputs to be resized
optimally for the native resolution of the display.
Advanced scaling techniques are supported, such as
format conversion using multiple programmable regions.
Three independent image scalers coupled with frame
locking circuitry and dual programmable color lookup
tables create sharp images in multiple windows, without
user intervention.
Embedded SDRAM frame buffers and memory controllers
perform frame rate conversion and enhanced video
processing completely on-chip. A separate memory is
dedicated to storage of on-screen display images and
CPU general purpose use.
Advanced video processing techniques are supported
using the internal frame buffer, including motion adaptive,
temporal deinterlacing with film mode detection. When
used in combination with the new third-generation scaler,
this advanced video processing technology delivers the
highest quality video for advanced displays.
Both input ports support integrated DVI 1.0 content
protection using standard DVI receivers.
A new advanced OSD Generator with more colors and
larger sizes supports more demanding OSD applications,
such as on-screen programming guides. When coupled
with the new, faster, integrated microprocessor, this OSD
Generator supports advanced OSD animation techniques.
Programmable features include the user interface, custom
start-up screen, all automatic imaging features, and
special screen effects.
Features
• Third-generation, two-dimensional filtering techniques
• Third-generation, advanced scaling techniques
• Second-generation Automatic Image Optimization
• Frame rate conversion
• Video processing
• On-Screen Display (OSD)
• On-chip microprocessor
• JTAG debugger and boundary scan
• Picture-in-picture (PIP)
• Multi-region, non-linear scaling
• Hardware 2-wire serial bus support
Applications
• Multimedia Displays
• Plasma Displays
• Digital Television
Device Application Package
PW181-10V Up to XGA Displays
352 PBGA
PW181-20V Up to UXGA Displays
Crystal
ROM
Display
PW181
Video
Input
ADC/
TMDS
Video
Decoder
Com puter
TV Tuner
TV
Signal
TV
Signal
ADC/
TMDS
Com puter
Video
Input
TV Tuner
Video
Decoder
PW181 System Block Diagram