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LG_Technical_Beginner_Guide_[SM]


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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



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