Techwell
LCD DIsplay Processors
TECHWELL
DISPLAY
Target Applications
Portable TV
Rear Seat Car Display
Portable DVD
Navigation + DVD
Door Phone
DMB TV
In Flight Display
TW8806
LCD Display Processors
with built-in Video Decoder and T-CON
Techwell’s TW8806 LCD display processor is a low cost high quality TFT
panel controller with an embedded NTSC/PAL/SECAM TV decoder. This
unique level of mixed signal integration enables the panel to be used as a
stand-alone LCD display for in car entertainment, portable DVD and
portable LCD TV applications. An integrated triple analog-to-digital
converter supports YPbPr/RGB component input and allows direct
connection to DVD and Navigation sources. In addition, flexible digital
inputs supports 24bit Digital RGB and 8/16/24-bit YCbCr inputs.
The TW8806 contains all the logic required to convert standard TV, DTV,
and PC monitor signals to the digital control and data signals required to
drive various TFT panel types. It supports TFT panel resolutions
up to 1280 by 768 with 1-pixel/clock formats.
The chip has nine analog inputs. This enables a number of input
combinations simultaneously. For example, the chip can accept up 4 CVBS
inputs simultaneously.The chip can also accept one CVBS, one S-Video, one
component and one analog RGB simultaneously.
The integrated analog front-end contains three ADCs with three clamping
circuits and one Automatic Gain Control (AGC) circuit to minimize external
component count. It employs a 4H, 5-line adaptive comb filter and
proprietary Y/C processing technologies to produce exceptionally high
quality pictures.
The chip's internal logic synchronizes the panel frame rate to the incoming
input frame rate. A high quality image-scaling engine is used to convert
the lower resolution formats or high resolution DTV formats to the output
panel resolution. An internal de-interlacing engine also allows interlaced
video to be supported.
On Screen Display is supported through an on-chip OSD RAM for
maximum flexibility. A closed caption decoder is built in. The TW8806 also
accepts a 24 bit digital RGB input from external PanelLinkTM receiver or
ADCs for use as computer monitor. In addition, it accepts 8/16/24 bits
digital YCbCr input for use with external ADCs for use
as DTV monitor.
The TW8806 also supports TFT panel power sequencing, DPMS (VESATM
Display Power Management Signaling) signaling and power management.
The control interface is a 2-wire serial bus interface. The TW8806 core
operates at 1.8 V, the IO at 3.3 V and packaged in a 128-pin PQFP package.
Features
Integrated high performance
NTSC/PAL/SECAM video decoder
Built in high quality De-interlacing engine
Black / white / blue stretch for higher contrast
Favorite color enhancement
Integrated timing controller (T-CON) with
digital and analog panel support
QVGA up to WXGA panel resolution support
Low power consumption (600 mW)
Small form factor 128-pin PQFP
Video Decoder and Processing
Three 9-bit ADCs and analog clamping circuit
Fully programmable static gain or automatic
gain control for the Y or CVBS channel
Programmable white peak control for the Y or
CVBS channel
Software selectable analog inputs allows any
of the following combinations:
Up to 4 composite video
Up to 2 S-Video
1 YPbPr component
1 RGB
4-H adaptive comb filter Y/C separation
Image enhancement with 2D dynamic peaking
and CTI
Programmable hue, brightness, saturation,
contrast, sharpness, Gamma control, and noise
supression
Detection of level of copy protection according
to Macrovision standard
Buffered CVBS output
Techwell
LCD Display Processor
TW8806
LCD Display Processor
with built-in Video Decoder and T-CON
TW8806 Block Diagram
OSD
CIN0
MUX
CIN1
CIN2
3X Analog Front End
Chroma
Demodulation
Spead
Spectrum
PLL
Alpha Blending
TCON
VIN1
MUX
VIN0
TCON
signals
YUV Proce ssing
YIN0
FPR [7:0]
Image Enhancement
Scaler / Deinterlacer
MUX
YIN1
YIN2
YIN3
Panel Timing Generator
FPG [7:0]
FPB [7:0]
Gamma / Dither
Color Matrix
Line Buffers
MUX
MUX
Triple
DAC
FPVS
FPHS
FPDE
FPCLK
FPPWC
FPBIAS
ROUT
GOUT
BOUT
SOG
SYNC
PLL
DTVCLK
DTVVS
DTVHS
DTVDE
DTVD [23:0]
COAST
Sync Processors
4H Adaptive
Comb Filter
DTV I/F
MC SDA
Input Format
Measurement
Registers
2 Wire
Serial Bus
MC SCL
MC SIA
24bit Digital RGB and
8/16/24-bit YCbCr Inputs
Allows connection to analog PC Graphics cards with the
addition of a 3 channel A/D converter for up to WXGA
resolution
Allows YCbCr digital component input for DTV 480p, 720p,
1080i
For connection to digital PC graphics cards (with the
addition of a PanelLinkTM DVI interface receiver)
TFT Panel Support
Supports digital and analog LCD panels
Supports a wide variety of active matrix TFT panels one
pixel per clock
Supports panel with resolution up to WXGA (1280 x 768)
Supports 3, 4, 6 or 8 bits per pixel up to 16.8 million colors
Timing Controller (TCON)
Support programmable interface signals for control
column(source) driver / row(gate) driver
Support analog RGB output
Programmable VCOM output
Dual channel charge pump output with back sensing
Miscellaneous
Supports 2-wire serial bus interface
Spread spectrum PLL
5V tolerant I/O
Power-down mode
Typical power consumption 400 mW
Single 27MHz crystal
128-pin PQFP package
Analog RGB / YCbCr Inputs
Allow direct connection to analog RGB or YCbCr input up
to WVGA or 480p resolution
Built-in PLL support for embedded or separated sync
Input measurement support
About Techwell
Techwell is a fabless semiconductor company that designs, markets and sells mixed signal integrated circuits for multiple digital video
applications in the consumer, security surveillance and automotive markets, including advanced TVs, multifunction LCD monitors, DVD
Recorders, security surveillance systems and in-car LCD displays. Founded in 1997, we currently have over 80 employees and are
headquartered in San Jose, California, with additional R&D and sales activities in South Korea, Japan, Taiwan and China. NASDAQ: TWLL
Techwell
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