LG LCD-TFT free download

File name LCD-TFT tech info and specs.pdf

Welcome to LG LCD TV CIS Canada America LE-15A10 Europe LL-15A10 China Middle-East Taiwan Philippines Asia Africa 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 (MOS-FET) DRAIN Vth Vth TFT DRAIN GATE GATE SOURCE SOURCE 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 TFT Panel TFT Element SOURCE Semi-Conductor Insulator TFT Cross section GATE DRAIN Glass Panel Transparent Pixel Electrode 4 Structure of TFT- LCD 300 (Approx...) ) One Pixel C/F Glass TFT LCD Panel Common Electrode ) TFT Glass Pixel Electrode Data Line Gate Line Liquid Crystal Control the amount of light by the Applying Voltage Source Transport the Data Signal - Glass + - + + - + - Pixel Applying Voltage to the Liquid Crystal Polarizer Glass + Gate On/Off the TFT Liquid Crystal 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 which polarize the light to one direction. Polarizer < Light transmittance > Polarized light Electrode Liquid Crystal VLC = off Electrode < VLC = 0 > VLC = on < Blocking > Liquid Crystal < VLC = 3.3V > 6 Operating Theory (Braun Tube : Light Emitting Component) GLASS Grid 1 Anode Grid 4 Flourescent HEATER Grid 3 (TFT-LCD : Non-Light Emitting Component) COLOR FILTER Polariz