Circuit Description - ViewSonic N2635w-1M Service Manual

4. Circuit Description

A. Analog Switch and Video input.
The MT5371 is a complete backend hardware and software solution. It consists of a DTV
backend decoder and a TV controller and combines a transport de-multiplexer, a high
definition MPEG-2 video decoder, an AC3 audio decoder, an LVDS transmitter, and an
NTSC/PAL/SECAM video decoder with a 3D comb filter.
On-chip advanced motion adaptive de-interlacer (MDDi™) generates very smooth picture
quality for motions.
A 3D comb filter added to the video decoder recovers great detail for still pictures. The special
color processing technology provides natural colors and true studio quality graphics.
Analog switch is built in MT5371 and accept CVBS, YPbPr, S-Video, RGB signal directly to
internal video front end. For most system application, there is no need to add external
components to add analog video multiplexer on board.
The video ADC sample analog input signals. After ADC, all signal processing is digital
domain. The source select multiplex all inputs from digital and analog video ports and route
them into Main data path.
B. 3D comb filter, Video Decoder, Deinterlacer and Scaling controller.
MT5371 includes 3D comb filter TV decoder to retrieve the best image from popular
composite signals. Embedded HDTV/VGA decoders let the high bandwidth input signals
perfectly reproduced. 8 bits digital port may accept all kinds of external digital input video
source. New advanced motion adaptive de-interlacer converts accordingly the interlace video
into progressive one with overlay of a 2D Graphic processor. Advanced full function color
processing with fully 10-bit path provides high quality video contents. Independent two
Flexible scalers provide wide adoption to various LCD panels for two of different video
sources at the same time. MT5371 supports alpha blending for Video and two OSD planes. It
also supports 10bit gamma correction and advanced dithering processing for LCD display with
6/8/10 bit output.
ViewSonic Corporation
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N2635w-1M