AXIOMTEKLCD Training

AXIOMTEKLCD Training

AXIOMTEK Co., LTD .Customer Service DepartmentDate: 2007/01/01 1st version

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Contents in brief

• LCD introduction• LCD support Flow Chart• Simple Assumption• AXIOMTEK Offer• Close up• Q&A

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LCD Introduction

• 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.

Tracy: hot-> liquid crystal become clear

Cold-> become solid & turbid

Tracy: hot-> liquid crystal become clear

Cold-> become solid & turbid

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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.

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LCD Panel Type comparison

LCD LCD TypeType

FunctionFunction

MonoMono STNSTN DSTNDSTN TFTTFT

ColorColor No Yes Yes Yes

View AngleView Angle Wide Narrow Narrow Wide

SizeSize 4”~10” 4”~10” 4”~12” 5”~17”

CostCost Low Middle Middle High

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LCD Signal Transmission Interface 1

• TTL (Transistor – Transistor Logic)A common interface type is easy to see in LCDmanufacture. Application: Digital camera…

Specification: Bandwidth: Up to 80Mbps Noise: High Distance: Maximum test about 75cm. Standard 20~50 cm.

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LCD Signal Transmission Interface 2

• LVDS (Low Voltage Differential Signaling) This kind of interface type has good signal transmissionQuality. 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…..)

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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

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Start to Light Up LCD

LCD LCD InverterLCD cable/PK

Inverter cableLCD Datasheet

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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 not7. 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

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LCD data sheet – Resolution 1

Resolution ( pixels ) - VGA 640x480- VGA 640x480 - SVGA 800x600- SVGA 800x600 - XGA 1024x768- XGA 1024x768 - SXGA 1280x1024- SXGA 1280x1024 - UXGA 1600x1200- UXGA 1600x1200

Panel Type

SHFCLK @60Hz

refresh rate (MHz)

Addressability 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

☺ The QVGA & HVGA use the 640x480 resolution in BIOS

(320x240)

(640x240)

(640x480)

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LCD data sheet – Electrical Characteristics

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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)

V

SIS552

V

V (DSTN)

V (DSTN)

SMI Lynx 721 / 712

V

V

VIAVT8606

Twister T

VVVTFT

VVSTN/DSTN

VMONO

VEL

NS 5530

Trident9525DVD

C&TVGA Chip

V

Intel 845GV

- 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

Each Panel Kit includes:1) conversion board2) 44pin cable (for SBC connection)3) LCD cable (for LCD connection)4) inverter cable.

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Panel Kit – LCD connection

Search PK

LCD connector

Pin assignment

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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

Output Pin assignment

Input Pin assignment

Connector type

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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

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Make new LCD cable 2

4. LCD cable quality Coaxial Cable WireCoaxial Cable Wire

TwistingTwisting - SHFCLK

- LP

- FLM

- M/DE

ShieldingShielding - - 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

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BIOS LCD Type Selection

AXIOMTEK smart view

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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…

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LCD function Test

Software Software - MODETEST.EXE- MODETEST.EXE

- LCDTEST.EXE- LCDTEST.EXE

- WINDOWS Driver- WINDOWS Driver

FunctionFunction - Test the display capability in different resolution- Test the display capability in different resolution

- Test the display capability in different color - Test the display capability in different color resolutionresolution

- Check the display quality in specific mode- Check the display quality in specific mode

- Different programs for different chipset- Different programs for different chipset

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Close Up

• Check the datasheet of LCD carefully• Make sure panel driving Vcc from datasheet an

d 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

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FAQ

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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 controlSignal 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