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Welcome to
LG LCD TV
CIS Canada
LE-15A10 Europe
LL-15A10
China America
Middle-East Taiwan
Philippines
Africa Asia
LT-15A10
Austria
1
Contents
1. LCD Technology
1) What is TFT LCD ?
2) Structure of TFT LCD
3) TFT-LCD Operating Mechanism
4) Operating Theory
5) Structure LCD Module
6) Structure of Back light
7) Function of Back light
8) Key Parts ; Color Filter, Polarizer
2. LCD Market Trend
(1) Comparison with other Display devices
(2) World Display Market Trend
(3) LCD TV Market trend
(4) Guidance of handling LCD product
(5) Abbreviations
3. LCD TV Structure
(1) General Specifications
(2) Presentation for SVC Engineer
2
1. LCD Technology
1) What is TFT LCD ?
2) Structure of TFT LCD
3) TFT-LCD Operating Mechanism
4) Operating Theory
5) Structure LCD Module
6) Structure of Back light
7) Function of Back light
8) Key Parts ; Color Filter, Polarizer
3
What is TFT(Thin Film Transistor)?
TRANSISTOR TFT
(MOS-FET)
DRAIN
DRAIN
Vth GATE
Vth
GATE
SOURCE
SOURCE TPE
When supply over certain voltage(Vth) to
the GATE, it delivers information from Compound Transistor with thin film in every Pixel
Drain to Source on ITO.
SWITCHING Characteristics Independent on neighboring Pixel
TFT Panel
TFT Cross section
TFT Element
SOURCE GATE DRAIN
Semi-Conductor
Insulator
Glass Panel
Transparent Pixel Electrode
4
Structure of TFT- LCD
300 (Approx....)
TFT LCD
C/F Glass Panel
)
One Pixel
Common Electrode
TFT Glass
)
Pixel Electrode
Data Line
Gate Line
Liquid Crystal
Control the amount
of light by the
Applying Voltage
Glass
Source Pixel Polarizer
Transport the + + + + Applying
Data Signal Voltage
- to the
- -
- - - Liquid Crystal
Glass
+ Liquid
Gate
Crystal
On/Off the
TFT
Back Light
- - - - - -
White (TFT Off) Black (TFT On)
5
TFT- LCD Operating mechanism
The structure of TFT-LCD is that Liquid Crystal is being filled between C/F Glass & TFT Glass. One Pixel consists of 3
sub-Pixels(R,G,B) and according to the number of the pixels, Display Resolution (SVGA,XGA,etc) is determined.
The TFT Matrix consists of Data Line(Carrying display data signal),Gate Line(Carrying signal for turn On/Off the
TFT).Each TFT, on each sub-pixel, controls the amount of Applying Voltage between C/F glass electrode & TFT glass
electrode for the Liquid Crystal.
The Applying Voltage changes the Direction of Liquid Crystal which changes direction of the Light. Transmittance rate
of the Polarized Light, polarized by Polarizer, is controlled by Applying Voltage. As a conclusion, Displayed Light is now
under-control of Display Data Signal.
Light(CCFL lamp)
Polarizer is a filter
Polarizer which polarize the
light to one direction.
< Light transmittance > < Blocking >
Polarized light
Electrode
Liquid VLC VLC Liquid
= off = on Crystal
Crystal
Electrode
< VLC = 0 > < VLC = 3.3V >
6
Operating Theory
(Braun Tube : Light Emitting Component) (TFT-LCD : Non-Light Emitting Component)
GLASS
COLOR FILTER
Anode Polarizer Glass Panel
Grid 1 Polarizer
Grid 4
Flourescent
HEATER Grid 3
Liquid
Crystal
Green
Beam
Luminous Light(White)
Source
Grid 2
Electronic Gun Deflection
Section Vacuum
TFT+Electrode Electrode
7
Structure of LCD Module
LCM = Case top + LCD panel
B/L Assy + Plate
Case Top
LCD Panel
Diffusers & Prisms
Back light
Light Guide Assy
Reflector
Lamp
Housing Lamp
D-IC(on TCP)
PCB
Support Main
Bottom Plate
Bottom Cover
8
Structure of LCD Module
Driving
Circuit
Bright Dark Gray
Data Driver IC Common
Electrode R
Printed PCB Board G
Gate Driver IC B
Inverter
Dn-1
Pixel Array & Wiring Dn
Dn+1
Pixel Electrode LC
Power Supply Polarizer
for Video Signal CF Panel
LC LC Panel
TFT Panel
Polarizer
Lamp
Lamp
Prism
Diffuser B/L Unit
Lamp Light Guide
Reflector
Inverter
9
Structure of Back Light Unit
Pad
Diffuser(Protector)
Top Prism
Bottom Prism
Diffuser
Light Guide
Reflector
Supporter main
Lamp Ass'y
Screw
Lamp Housing
Plate
10
Function of Back Light
Structure of Back Light Function on each part
LCD PANEL Display the light controlled by data signal
Diffuser Same structure as bellow diffuser, Protect the
(Protector) top prism
Top Prism
Same function as bottom prism, Increase the
luminance up to 1.33 times of bottom prism
Bottom Prism Concentrate the light and increase the luminance
up to 1.55 times of the light guide
Diffuser Uniform and concentrate the light received
from light guide
Lamp
Light guide Guide the light from lamp and uniform the light
(Flat/Wedge)
Lamp Housing(Lamp Reflector) Pattern(Dot/Shibo/V-cut)
Reflector Reflect the leakage light from light guide to reduce
the loss of the light injected to the light guide
11
Key Parts : Color Filter
To realize color of the Display, array Red,Green & Blue color paint beneath Upper Glass Panel regularly in
accord with Pixel electrode of lower Glass Panel.
! Kinds of Pixel Array
Delta Array Stripe Array Mosaic Array
! The Function of Color Filter
Divide the white light from luminous source into Red, Green & Blue
Pixel
White Light Common Electrode
Glass
R G B
12
Key Parts : Polarizer
A kind of filter, which polarize light one direction.
Light
Polarizer
13
Key Parts : Back Light
Back Light Unit,located behind TFT-Panel lower Glass, and supplies light to the PANEL.
CCFL LAMP
(Cold Cathode Fluorescence Lamp) Can realize White Light
LAMP Long life time(Appr. 25,000HRS)
Simple Brightness control
Small Size
AC 1000V Easy to Adhere
Inverter
Direct Type Side Guided Type
LCD Panel LCD Panel
Structure
Guide
LAMP
LAMP CASE Reflector
Merits High Light Efficiency Slim & Compact Size
Simple Structure
Demerits Thick Complicated Structure,Expensive
Low Light Efficiency
14
Key Parts : Drive IC
Supplies the signal from PCB to TFT-PANEL
TCP TYPE DRIVER IC
(Tape Carrier Package) GATE DRIVER IC(8EA) : Horizontal
Supplies signals from Data line to the Gate
of TFT-PANEL sequentially. Each IC controls
128 lines in horizontal.
DRIVER IC SOURCE DRIVER IC(5EA) : Vertical
Supplies the Pixel Data from SOURCE to each
Pixel when the Gate of TFT PANEL ON.
Each IC controls 154 lines in vertical.
15
2. LCD Market Trends
(1) Comparison with other Display devices
(2) World Display Market Trend
(3) LCD TV Market Trend
(4) Guidance of handling LCD products
(5) Abbreviations
16
Comparison with other Display devices
Large Screen Basic Functions
Full Response
Over 40" Contrast Brightness Resolution View Angle
Color Time
C Normal
P
T Flat
LCD
PDP*
VFD**
*PDP : Plasma Display Panel
**VFD : Vacuum Flourescent Display
: Very Good(Possible to realize)
: Good(Hard to realize)
: Bad(Impossible to realize)
17
World Display Market Trend
60"
Projector
50"
P
40" D
P
30"
LCD CRT
Market 1
20"
Market 3
LCD
10"
LCD
Market 2
Small AV System NTPC*** Monitor Large AV System
NTPC : NoteBook PC
18
LG LCD TV Market Trend World Market
World Market LCD TV
K
7000
7000
6000
5000 4000
4000
Volume
3000 2000
2000 1000
250 500
1000
0
2000 2001 2002 2003 2004 2005
Years
Source : IDC JAPAN
19
Guidance of handling Color TFT LCD Module
Color TFT LCD Module is very sensitive both electrically and physically.Users, therefore,
are requested to follow the "Guidance of handling color TFT LCD Module" on the followings.
1 Be careful not to make scratch 5 High temperature & high humidity
on the polarizer. reduce the life-time.
- Surface of polarizer is soft and can be - LCD is not proper to be used at high temp-
physically damaged easily. erature and high humidity.
- Please do not touch, push or rub polarizer - Please keep specified temperature and
surface with materials over HB hardness. humidity condition.
2 Keep clean the surface. 6 Keep out of Corrosive Gas.
- Please wear rubber glove when touch the
- Corrosive gas effect the polarizer and the circuit
surface of LCD screen.
chemically and cause defects accordingly.
- Please use soft and anti-static material
with n-Hexane as cleaner.
3 Keep out of water. 7 Electrostatic discharge can make damage
- Water on/in the LCD may cause electrical - There are electro-static sensitive components such as
short or corrosion. CMOS in LCD Module.
- Please wipe out or dry water carefully. - Please earth human body when handle the LCD.In addition,
please do not touch the interface connector pin with bare
4 hand. Do not operate for a long time under
Prevent swift Temperature 8
& Humidity change. the same pattern.
- Swift temperature and/or humidity change - Operating LCD for a long time under the same pattern
can make dew or ice which cause can cause image persistence and can damage it.
nonconformance such as malfunction. - Please follow following guidance.
1. Turn the power off when do not use.
2. Change the pattern periodically.
20
Abbreviations
Abbreviations on LCD Module and TV
No Terms Full Description
1 ACF Anisotropic Conductive Film
2 B/L Back Light
3 CCFL Cold Cathode Fluorescent Lamp
4 CF Color Filter
5 CR Contrast Ratio ( White / Black )
6 FPD Flat Panel Display
7 LC Liquid Crystal
8 LCD Liquid Crystal Display
9 LCM Liquid Crystal Module
10 LD Line Defect
11 MNT Monitor
12 POL Polarizer
13 Pixel Picture Element
14 TAB Tape Automatic Bonding
15 TCP Tape Carrier Package
16 TFT Thin Film Transistor
21
LG LCD TV
1) General Specification
- Key Value
- Specifications
- Monitor Features
- Unique Features
2) Presentation for SVC Engineer
- Specifications
- Exploded View
- Interconnection Guide
- Block Diagram
- IIC Adjustment
- MICOM Pinning & Descriptions
- Video Processing
- Audio Processing
22
General Specifications Key Value
LE/LL/LT-15A10
KEY VALUE
-. Great Design . Modern Style
. Slim
. Free space
-. Dual Functionality . Computer Monitor
Up to XGA 1024X768 85Hz
. Independent TV Receiver
-. High-Tech . LCD
. HD Compatible
. Component Input(Optional)-ME
. SCART Jack(Optional)-EU
Without Stand Stand type Wall mounting
23
General Specifications Monitor Features
PC Input 1. Connect the signal cable from the monitor out socket of
the personal computer to the input socket of the set.
2. Connect the audio cable from the PC to the Audio socket
of the set.
3. Press the TV/AV/PC button to select PC Mode
4. Switch on the PC Mode, and the PC Screen automatically
appears on the set. The set can be operated as the PC monitor.
Mode Resolution Horizontal Freq.(KHz) Vertical Freq.)Hz)
640 X 480 31.5kHz 60Hz
640 X 480 35kHz 67Hz
Note : 565 X 496 37.9kHz 72Hz
VGA
1. Check the PC Mode before exchanging the new monitor(LG), 640 X 480 37.5kHz 75Hz
the PC Mode should be within a mode in the table listed . 640 X 480 43.3kHz 85Hz
If over XGA mode, after change the PC mode to one mode of 720 X 400 31.5kHz 70Hz
table listed ( If possible, use the 1024 X 768 @60Hz
video mode to obtain the best image quality for you. 800 X 600 35.2kHz 56Hz
and then exchange the monitor ). 800 X 600 37.9kHz 60Hz
2. When the PC screen appears on the set, some message may 800 X 600 48.1kHz 72Hz
be appear on the screen, and the message is different depend SVGA
800 X 600 46.9kHz 75Hz
on Window system version( Win98,2000 )--Next Page 800 X 600 53.7kHz 85Hz
3. If you have an Apple Macintosh, connect the VGA adaptor 832 X 624 49.7kHz 75Hz
block from the 3 row 15 pin to 2 row 15 pin with the signal
cable and connect the VGA adaptor block to the Macintosh. 1024 X 768 48.4kHz 60Hz
The cable are not supplied, such as the signal cable, audio 1024 X 768 56.5kHz 70Hz
XGA
cable, VGA adaptor block for Macintosh PC. 1024 X 768 60.2kHz 75Hz
1024 X 768 68.7kHz 85Hz
24
General Specifications Unique Feature
Soft Touch Control
Soft Touch control system, LG's advanced technology, leads customers to the emotional satisfaction.
Its main characteristics are Anti-static function when touching besides softness & luxurious looking.
Conductive Rubber
Cabinet
Conductive Film
Insulation PCB
Conductive plate
25
Presentation for SVC Engineer Specifications
PAL/SECAM-B/G, SECAM-L/L' LL-15A10 TOP
TELETEXT FLOF/LIST/TOP*
SYSTEM PAL/SECAM-B/G,D/K, PAL-I LE-15A10 - Optional
PAL/SECAM-B,D,I, NTSC,4.43AV LT-15A10 Soft Touch control
Auto A/V
USER
100-240V , 50/60Hz Child Lock
CONVENIENT
AC/DC Adapter 12V Easy picture control(PSM)
POWER FEATURES
Power consumption : 30 W Auto sleep
Stand by : 3W Below Any key power on
FVS, 100Program(200 Optional) MONITOR XGA 1024 X 768 85Hz
Auto/Manual programming LT-15A10
TUNING Type Color Active Matrix TFT
ACMS+ With VPS & TXT (TTS Turbo
Quick View search Sys.) Size 15.1" ( 38.35cm)
Pixel Format 1024 X 768 Pixel
PSM Display Type R / G / B Stripe
LCD
-Dynamic, Standard, Mild, Game Pixel Pitch 0.3 X 0.3mm
VIDEO Panel
Digital comb filter Color Depth 16Mil. Color, 8 bits
Progressive scan Active Video Area 307 X 230mm
Surface Anti Glare, Hard Coating
RF Stereo ( A2, NICAM) Back Light 2CCFL
DASP(4mode)
SOUND AVL, Balance(stereo) Viewing Angle Left / Right : 75 ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo