Download AXIOMTEK LCD Training

AXIOMTEK
LCD Training
AXIOMTEK Co., LTD .
Customer Service Department
Date: 2007/01/01 1st version
Contents in brief
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•
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LCD introduction
LCD support Flow Chart
Simple Assumption
AXIOMTEK Offer
Close up
Q&A
2
LCD Introduction
Tracy: hot->
liquid crystal
become clear
Cold->
become solid
& turbid
• LCD (Liquid Crystal Display)
A type of display used in digital watches and many portable computers.
LCD displays utilize two sheets of polarizing material with a liquid
crystal
solution between them. An electric current passed through the liquid
causes the crystals to align so that light cannot pass through them. Each
crystal, therefore, is like a shutter, either allowing light to pass through
or blocking the light.
3
LCD Panel Type
• Mono (Monochrome): actually using two colors, one for the
display image (the foreground) and one for the background.
• STN (Super Twisted Nematic): using the Voltage to change
the liquid crystal twisted angle to see the display; maximum 90
point of view.
• DSTN (Double Super Twisted Nematic): a passive-matrix
LCD technology that uses two display layers to counteract the color
shifting that occurs with conventional super twist displays.
• TFT (Thin Film Transistor): in which each pixel is controlled
by from one to four transistors. The TFT technology provides the
best resolution of all the flat-panel techniques, but it is also the
most expensive. TFT screens are sometimes called active-matrix
LCDs.
4
LCD Panel Type comparison
LCD Type
Mono
STN
DSTN
TFT
No
Yes
Yes
Yes
Wide
Narrow
Narrow
Wide
Size
4”~10”
4”~10”
4”~12”
5”~17”
Cost
Low
Middle
Middle
High
Function
Color
View Angle
5
LCD Signal Transmission Interface 1
• TTL (Transistor – Transistor Logic)
A common interface type is easy to see in LCD
manufacture. Application: Digital camera…
Specification:
Bandwidth: Up to 80Mbps
Noise: High
Distance: Maximum test about 75cm.
Standard 20~50 cm.
6
LCD Signal Transmission Interface 2
• LVDS (Low Voltage Differential Signaling)
This kind of interface type has good signal transmission
Quality. The leader is OpenLDI.
Application: Notebook, automobile telecommunications…
Specification:
Bandwidth: 622Mbps
Noise: low (low EMI)
Distance: 0~1000cm Standard 50 cm.
(ex:PK898A,PK898B, LVDS cable only…..)
7
LCD Signal Transmission Interface 2
• DVI (Digital Visual Interface)
This type bases on TMDS、 PanelLink, usually using in
LCD monitor, CD,DVD,CDMA,DV,The leader is Intel.
Specification:
Bandwidth: 650Mbps
Noise: low (low EMI)
Distance: 0~1000cm
8
Start to Light Up LCD
LCD
LCD Inverter
LCD cable/PK
LCD Datasheet
Inverter cable
9
LCD Support Flow
1. Customer, Sales person ask AE team to support LCD lightening up
service.
2. Customer fill in “ LCD Support Request Form “ to AXIOMTEK AE team.
3. AE team evaluate technical possibilities and check existing LCD
database.
4. Customer sign back “ LCD Lightening up Agreement “
5. Customer provide LCD Kit to AE
6. AE determine making LCD sample cable or not
7. AE Perform LCD Lightening up test ( hardware setup, function test,
application test)
8. AE will provide complete solution. (Inverter cable, LCD cable,
available VGA driver and BIOS)
Record all technical information to LCD support list. (AE).
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LCD data sheet – General Information
11
LCD data sheet – Resolution 1
Resolution ( pixels )
- VGA
- SVGA
- XGA
- SXGA
- UXGA
640x480
800x600
1024x768
1280x1024
1600x1200
Panel
Type
SHFCLK
@60Hz
refresh rate
(MHz)
Addressabilit
y Horz. X Vert.
Number of
Color Pixel
Number of
Pixel Element
Panel Bit
Support
VGA
25.0
640 X 480
307,200
921,600
9, 12, 18, 24
SVGA
38.2
800 X 600
480,000
1,440,000
12, 18, 24
XGA
65.0
1024 X 768
786,432
2,359,296
12, 18, 24
SXGA
107.0
1280 X 1024
1,310,720
3,932,160
12, 18, 24
UXGA
152.0
1600 X 1200
1,920,000
5,760,000
12, 18, 24
HDTV
164.0
1920 X 1080
2,073,600
6,220,800
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LCD data sheet – Resolution 2
Resolution ( pixels )
-QVGA 320x240
- HVGA 640x240
(320x240)
(640x480)
(640x240)
☺ The QVGA & HVGA use the 640x480 resolution in BIOS
13
LCD data sheet –
Electrical Characteristics
14
LCD data sheet – Connector&Pin assignment
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LCD Data Sheet – Backlight
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LCD data sheet – Timing Specification
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VGA Chip & LCD Type Support List
# LCD support factors: Hardware(VGA chip,SBC output signal)
Software (VGA BIOS, Driver)
VGA Chip
C&T
Trident
9525DVD
EL
V
MONO
V
STN/DSTN
V
V
TFT
V
V
NS 5530
SMI Lynx
721 / 712
SIS
552
VIA
VT8606
Twister T
Intel
845GV
V (DSTN)
V (DSTN)
V
V
V
V
V
V
- C&T 69000/69030 standard BIOS don’t support EL / MONO
- NS 5530 only support 18bit TFT
-VIA VT8606 standard BIOS don’t support color DSTN / STN LCD
-Intel 845GV support 4 pair data & one pair clock for each channel
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Embedded Board & LCD Support List
Website address: www.axiomtek.com.tw/support
FAQ -> Type LCD support List
(When there is any new information, AE will update it
to LCD support list for customer’s reference.)
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LCD Support List – Information 1
Pin assignment (depends on different VGA chip)
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LCD Support List – Information 2
History (BIOS smart view)
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LCD Support List – Information 3
BIOS LCD type setting / Panel Kit / Inverter
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Panel Kit Inclusion
1)
2)
3)
4)
 Each Panel Kit includes:
conversion board
44pin cable (for SBC connection)
LCD cable (for LCD connection)
inverter cable.
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Panel Kit – LCD connection
Search PK
LCD connector
Pin assignment
24
Panel Kit - Inverter connection
Inverter connector Output:
P1:+12V (yellow)
P2:+5V (red)
P3:N.C (white)
P4:ENABLE (orange)
P5:GND (black)
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Inverter data sheet
- Connector&Pin assignment
Input Pin assignment
Output Pin assignment
Connector
type
26
Make Inverter cable
Inverter major input: +12V(+24V), GND, BL_EN, ADJ_BR
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Solution with Panel Kit
SBC84600+PK898A+QF82V2
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Inquiry Service requirement
1. LCD datasheet
2. SBC model name
3. Inverter datasheet
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Make new LCD cable 1
1.SBC (LCD connector) & LCD (corresponding
connector)
2.SBC (LCD pin assignment) & LCD (Input pin
assignment)
3.Length
30
Make new LCD cable 2
4. LCD cable quality

Coaxial Cable Wire

Twisting
- SHFCLK
- LP
- FLM
- M/DE

Shielding
- Braid Copper Net
- Conductive fabric Tape
- Sum-tube
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Make new LCD cable 3
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Solution with LCD cable Only
33
BIOS LCD Type Selection
AXIOMTEK smart view
34
Modify VGA BIOS
 VGA BIOS is the one of factor for lighting up LCD.
 VGA BIOS is a self–upgradeable ROM package.
Using C220.EXE to check VGA BIOS version (provide by Award) C220
84600A19.bin /d => 705SW75.ROM
 The modification programs are authorized by VGA
chip vendor.
1) Considering the control of BIOS version, we do not recommend
customer to modify the register of VGA BIOS.
2)If there is no matching type for customer’s LCD,AXIOMTEK will help
to modify a new BIOS but customer must provide the related data,
LCD…
35
LCD function Test

Software
- MODETEST.EXE
- LCDTEST.EXE
- WINDOWS Driver

Function
- Test the display capability in different resolution
- Test the display capability in different color resolution
- Check the display quality in specific mode
- Different programs for different chipset
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Close Up
• Check the datasheet of LCD carefully
• Make sure panel driving Vcc from datasheet and
has corrected by jumper (SBC,PK).
• Be careful when applying Vee to LCD
• Detail system and environment information
- Reversion of CPU card
- Version of BIOS
- LCD/Inverter model name & datasheet
- Cable length
37
FAQ
38
1. How to know the maximum support
of
resolution and color?
 Memory size> (resolution x BIT pixel) / 8

For example:
2MBytes > (1024x768x16) /8 = 1.57MBytes
2MBytes > (1280x1024x8) /8 = 1.31MBytes
p.s. : 8 BIT pixel = 2x2x2x2x2x2x2x2 = 256 color
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2. Why the display does not show full
screen in DOS mode when the BIOS LCD
type set over than 640x480 in GX1 board?
 The default display resolution is 640x480 in DOS
mode and GX1 does not support full screen function.
If your LCD specification is higher than 640x480, the
display will show narrower than your LCD screen.
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3.You may question why we do not design cable
only for TTL LCD. Because of signal quality
improvement, we use the panel kit to transmit
LCD signal. For cost, quality control
Signal quality control (Data, Clock..).
Signal conversion from TTL to LVDS.
some of Panel Kit has been designed with conversion IC from
TTL to LVDS.
E.g. PK898A,PK898B…
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4. Dual display is designed to display
ASSYMMETRY screen with one single board.
The type includes:
Stand-along VGA chip,
Dual VGA chips,
Dual VGA chips on non-identical board (two VGA cards).
SBC83675 – onboard VGA + PCI VGA card.
SBC836A1 –CLE266VGA supports duo-display.
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The End
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