L5-A Low-to-Mid End LCD-TV BOARD OVERVIEW
L5-A Low-to-Mid End LCD TV board incorporates the LCD Controller gm2221, to create a
high quality, stand-alone LCD-based TV system for consumer applications. Figure 1
illustrates the Block diagram of the board.
This board supposed to have two versions:
1. Low-End (to drive 14''-15’’ 4:3 panels)
2. Mid-End (to drive 17’’-20’’ 4:3 and 17’’-22’’-23'' 16:9 panels)
Figure 1
System Block Diagram
L5-A board supports 5 types of video and graphics inputs. These inputs are: Analog
terrestrial tuner input for multisystem PAL/SECAM transmission, SCART input (x2), S-VHS
input, RCA input and analog PC video input.
The analog RGB signals coming from the PC input (via D-Sub15 connector P401) are
directly connected to the gm2221 analog input port.
One EDID IC (U400) is provided on board to support VESA standard plug-and play
compatibility.
LOW TO MID END LCD TV WITH GM2221
Multimedia
Tuner
Chroma
Decoder
VPC 3230D
CVBS
EXT. CVBS, S-video
Scart RGB, FB
Teletext
DMCU
SDA5550
ITU 656
8-bit
GM2221
ADC+PLL
ITU 656
De-interlace
Scaling
MCU X86
OSD(4bit\pixel)
2 LVDS Tx
1p, 2p\clk
LVDS
15",
17",
20''
4:3
17''
22''
16:9
TFT
LCD
24-bit TTL
HS, VS, DE
Upto SXGA at 75Hz
Graphics
Upto SXGA at 75Hz
UXGA at 60Hz
RGB, HS, VS
EDID
VGA
SDA,SCL
FLASH
NVRAM
QSS
Audio
Decoder
MSP 3410G
QSS
Ext L/R
HP
TDA1308T
HP
L/R
AudioAmp
TDA1517P
Main
L/R
L R
Step Down
& Lineer
Regulators
12V
5V 3.3V 2.5V
8V
FLASH
SDRAM
Telet
ext
RGB, FB
Select
ed
Video
1.8V
