Circuit Description; Main Board - ViewSonic VS11422 Service Manual

4. Circuit Description

4.1 Main Board

General
■ Embedded dual DDC with DDC1/2B/CI
■ Zoom scaling up and down
■ No external memory required.
■Require only one crystal to generate all timing.
■ Programmable 3.3V/5V detection reset output.
■Embedded crystal output to micro-controller.
■ 3 channels 8 bits PWM output, and wide range
selectable PWM frequency.
Analog RGB Input Interface
■ Integrated 8-bit triple-channel 210/165 (optional)
MHz ADC/PLL
■ Embedded programmable Schmitt trigger of
HSYNC
■ Support Sync On Green (SOG) and various kinds
of composite sync modes
■ On-chip high-performance hybrid PLLs
■ High resolution true 64 phase ADC PLL
■ Y/Pb/Pr support up to HDTV 1080i resolution
■ Support 1 Analog input
Digital Video Input Interface
■ Built-in YUV to RGB color space converter &
de-interlace
DVI Compliant Digital Input Interface
(optional)
■ Single link on-chip TMDS receiver
■ Support to 165Mhz with long cable
■ Adaptive algorithm for TMDS capability
■ Data enable only mode support
■ High-Bandwidth Digital Content Protection
(HDCP 1.1) (optional only in H version)
■ Enhanced protection of HDCP secret key
(optional only in H version)
Auto Detection /Auto Calibration
■ Input format detection
■ Compatibility with standard VESA mode and
support user-defined mode
■ Smart engine for Phase/Image position/Color
calibration
Scaling
■ Fully programmable zoom ratios
■ Independent horizontal/vertical scaling
■ Advanced zoom algorithm provides high image
quality
■ Sharpness/Smooth filter enhancement
■ Support non-linear scaling from 4:3 to 16:9 or
16:9 to 4:3
Vivid Color™
■ Dynamic Contrast Control (DCC)
■ Independent Color Management (ICM)
Scalar--- RTD2554VH-GR (U6)
■ True 10 bits color processing engine
■ sRGB compliance
■ Advanced Dithering logic for 18-bit panel color
depth enhancement
■ Dynamic overshoot-smear canceling engine
■ Brightness and contrast control
■ Programmable 10-bit gamma support
Output Interface
■ Fully programmable display timing generator
■ Flexible data pair swapping for easier system
design.
■ Programmable TCON function support
■ RSDS-output interface on single PCB
■ Spread-Spectrum DPLL to reduce EMI
■ Fixed Last Line output for perfect panel
capability
Host Interface
■ Support MCU serial/parallel bus interface.
■ Support MCU dual edge data latch.
Embedded OSD
■ Embedded 12K SRAM dynamically stores OSD
command and fonts
■ Support multi-color RAM font, 1, 2 and 4-bit per
pixel
■ 16 color palette with 24bit true color selection
■ Maximum 8 window with alpha-blending/
gradient/dynamic fade-in/fade-out, bordering/
shadow/3D window type
■ Rotary 90,180,270 degree
■ Independent row shadowing/bordering
■ Programmable blinking effects for each character
■ OSD-made internal pattern generator for factory
mode
■ Support 12x18~4x18 proportional font
■ Decompress OSD font
Power & Technology
■ 3.3V power supplier
■ 0.18um CMOS process, 128-pin QFP package
12