Pw181 - Toshiba 27WLT56B Service Manual

• Rear Projection TVs
• Plasma Displays
• LCD Multimedia Monitors
• Multimedia Projectors

PW181

12.25.
12.25.1. 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.
12.25.2. 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
12.25.3. Applications
• Multimedia Displays
• Plasma Displays
27" TFT TV Service Manual
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05/09/2005