WT8871-C/WT8871-E
Video Display Controller for Analog
Small Size LCD Display System
Table of Contents
1. GENERAL DESCRIPTION ....................................................................................................................... - 5 -
1.1. FEATURES .....................................................................................................................................................- 5 -
1.2. APPLICATION ................................................................................................................................................- 6 -
1.3.SELECTION GUIDE..........................................................................................................................................- 6 -
1.4. BLOCK DIAGRAM..........................................................................................................................................- 7 -
1.5. APPLICATION EXAMPLE ................................................................................................................................- 8 -
2. PACKAGE TYPE AND PIN DESCRIPTION.......................................................................................... - 9 -
2.1. PIN CONFIGURATION.....................................................................................................................................- 9 -
2.2 PIN DESCRIPTION .........................................................................................................................................- 10 -
3. FUNCTION DESCRIPTION.................................................................................................................... - 13 -
3.1. MCU...........................................................................................................................................................- 13 -
3.2. VIDEO DECODER.........................................................................................................................................- 13 -
3.2.1. Video Input Crossbar......................................................................................................................... - 13 -
3.2.2. CVBS output....................................................................................................................................... - 13 -
3.2.3. SOG Input .......................................................................................................................................... - 13 -
3.2.4. Adaptive Comb Filter......................................................................................................................... - 13 -
3.2.5. Chroma Peaking ................................................................................................................................ - 13 -
3.2.6. Luma peaking..................................................................................................................................... - 14 -
3.2.7. Luma enhancement ............................................................................................................................ - 14 -
3.2.8. Auto Mode Detection ......................................................................................................................... - 14 -
3.3. INPUT PROCESSOR.......................................................................................................................................- 15 -
3.3.1. ITU-BT.656 Interface......................................................................................................................... - 15 -
3.3.2. Reference Timing Generation ............................................................................................................ - 15 -
3.3.3. Resolution Detect ............................................................................................................................... - 16 -
3.3.4. Active Video Region Detect................................................................................................................ - 17 -
3.3.5. Auto White Balance............................................................................................................................ - 17 -
3.4. SCALER .......................................................................................................................................................- 18 -
3.5. LUMINANCE AND CHROMINANCE ADJUSTMENT .........................................................................................- 18 -
3.5.1. Hue..................................................................................................................................................... - 19 -
3.5.2. Saturation........................................................................................................................................... - 19 -
3.5.3. Contrast.............................................................................................................................................. - 19 -
3.5.4. Sharpness ........................................................................................................................................... - 19 -
3.5.5. Brightness .......................................................................................................................................... - 19 -
3.5.6. Color Space Conversion .................................................................................................................... - 19 -
3.6. ON SCREEN DISPLAY (OSD).......................................................................................................................- 20 -
3.6.1. Character Attribute ............................................................................................................................ - 20 -
3.6.2. Display RAM...................................................................................................................................... - 20 -
3.6.3. User-Defined Font RAM .................................................................................................................... - 21 -
3.6.4. Color Look-Up Table (CLUT) ........................................................................................................... - 22 -
3.6.5. Background Windows ........................................................................................................................ - 23 -
3.6.6. Fade in/out function ........................................................................................................................... - 23 -
3.6.7. External OSD ..................................................................................................................................... - 23 -
3.7. GAMMA CORRECTION .................................................................................................................................- 23 -
3.8. DITHER .......................................................................................................................................................- 23 -
3.9. TCON AND PANEL CLOCK..........................................................................................................................- 24 -
3.10. DIGITAL-TO-ANALOG CONVERTER ...........................................................................................................- 25 -
3.11. VCOM OUTPUT ........................................................................................................................................- 25 -
3.12. SPREAD SPECTRUM PLL ...........................................................................................................................- 25 -
3.13. KEYPAD ADC ...........................................................................................................................................- 25 -
3.14. PWM ........................................................................................................................................................- 26 -
3.14.1. PWM ................................................................................................................................................ - 26 -
Copyright 2006 Weltrend Semiconductor, Inc. All Rights Reserved.
Weltrend reserves right to modify all information contained in this document without notice.
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