LG LE-15A10 Bedienungsanleitung
1
Welcome to
LG LCD TV
America
Canada
Philippines
Europe
Middle-East
Africa
China
Asia
CIS
Taiwan
Austria
LT-15A10
LE-15A10
LL-15A10
2
3. LCD TV Structure
(1) General Specifications
(2) Presentation for SVC Engineer
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
Contents
3
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
1. LCD Technology
4
TFT
TRANSISTOR
(MOS-FET)
GATE
Vth
DRAIN
SOURCE
GATE
DRAIN
SOURCE
Vth
TPE
When supply over certain voltage(Vth) to
the GATE, it delivers information from
Drain to Source
SWITCHING Characteristics
Compound Transistor with thin film in every Pixel
on ITO.
Independent on neighboring Pixel
What is TFT(Thin Film Transistor)?
TFT Panel TFT Cross section
Glass Panel
Semi-Conductor
TFT Element SOURCE DRAIN
GATE
Insulator
Transparent Pixel Electrode
5
Glass
Glass
-
- - -
!
!!
!Liquid Crystal
Control the amount
of light by the
Applying Voltage
Back Light
+
"
""
"Gate
On/Off the
TFT - - - - - -
White (TFT Off) Black (TFT On)
#
##
#Source
Transport the
Data Signal
Polarizer
$
$$
$Pixel
Applying
Voltage
to the
Liquid Crystal
+ + + +
- -
300 %
%%
%(Approx....)
Common Electrode
One Pixel
Data Line
Pixel Electrode
Gate Line
)
)C/F Glass
TFT Glass
Liquid
Crystal
Structure of TFT- LCD
TFT LCD
Panel
6
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.
TFT- LCD Operating mechanism
Light(CCFL lamp)
Polarizer
< Light transmittance > < Blocking >
< VLC = 0 > < VLC = 3.3V >
Electrode
Polarized light
Electrode Liquid
Crystal
VLC
= on &
&&
&
Liquid
Crystal &
&&
&VLC
= off
Polarizer is a filter
which polarize the
light to one direction.
7
HEATER
Grid 1
Grid 2
Grid 3
Anode
Grid 4
GLASS
Beam
Vacuum
Flourescent
Deflection
Section
Electronic Gun
(Braun Tube : Light Emitting Component) (TFT-LCD : Non-Light Emitting Component)
Polarizer Glass Panel Polarizer
TFT+Electrode
Luminous
Source
Green
COLOR FILTER
Electrode
Light(White)
Liquid
Crystal
Operating Theory
8
Case Top
LCD Panel
Diffusers & Prisms
Light Guide
Lamp
Support Main
Reflector
PCB
D-IC(on TCP)
Housing Lamp
Bottom Cover
Back light
Assy
Structure of LCD Module
#
Bottom Plate
"
$
!
LCM = Case top + LCD panel
B/L Assy + Plate
9
Driving
Circuit
Data Driver IC
Printed PCB Board
Gate Driver IC
Inverter
Power Supply
for Video Signal
Common
Electrode
Bright Dark Gray
Pixel Array & Wiring
Lamp
Lamp
Inverter
Pixel Electrode LC
LC Panel
B/L Unit
Polarizer
CF Panel
LC
TFT Panel
Polarizer
Lamp
Prism
Diffuser
Light Guide
Reflector
Dn-1 Dn Dn+1
RGB
Structure of LCD Module
10
Reflector
Light Guide
Diffuser
Bottom Prism
Top Prism
Diffuser(Protector)
Lamp Housing
Plate
Supporter main
Screw
Lamp Ass’y
Pad
Structure of Back Light Unit
Dieses Handbuch passt für folgende Modelle
2
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