LG LE-15A10 Manual de usuario

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LG LCD TV

America

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Europe

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China

Asia

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Taiwan

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LT-15A10

LE-15A10

LL-15A10

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

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

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

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

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.

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

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

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

Inverter

Pixel Electrode LC

LC Panel

B/L Unit

Polarizer

CF Panel

TFT Panel

Polarizer

Lamp

Prism

Diffuser

Light Guide

Reflector

Dn-1 Dn Dn+1

RGB

Structure of LCD Module

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

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