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TW8806
LCD Display Controller
with Built-In Video Decoder and TCON
For Analog and Digital LCD Panels
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Product
Description |
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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 24-bit 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.
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Target
Applications |
- Portable TV
- Rear Seat Car Display
- Portable DVD
- Navigation + DVD
- Door Phone
- DMB TV
- In Flight Display
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Features
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- 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
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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 |
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24-bit 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) |
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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 |
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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 |
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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 |
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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 |
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Block Diagram
(click on image for larger
view) |
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