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TFT LCD

TFT LCD. What is TFT LCD –Flat Panel Display. What is TFT LCD. TFT-LCD stands for T hin- F ilm T ransistor L iquid- C rystal D isplay It is an advanced display system “Liquid Crystals” are semi-solid substances that are sensitive to temperature and electricity. Commonly used in

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TFT LCD

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  1. TFT LCD

  2. What is TFT LCD–Flat Panel Display

  3. What is TFT LCD • TFT-LCD stands for Thin-Film Transistor Liquid-Crystal Display • It is an advanced display system • “Liquid Crystals” are semi-solid substances that are sensitive to temperature and electricity. • Commonly used in • Digital watches, calculators , laptops, monitor, TV • Compared with conventional CRT display systems • Advantages • Light • Thin • Low power consumption • Disadvantages • Expensive for computer display • Display size is limited by manufacturing complexities

  4. What is TFT-LCD TFT LCD Configuration

  5. What is TFT LCD– LCD Types • The Liquid Crystals themselves can not emit light, although they can control the amount of light passing through them. Two types of LCDs are available. • Transmissive • Contain their own fluorescent tube behind the LCD • Very commonly used for computer displays • Reflective : • Based on the reflection of external source of light • Commonly used in digital watches • Simpler and inexpensive

  6. What is TFT-LCD – LCD Types • Transmissive type • Reflective type • Transflective type

  7. What is TFT LCD– Transmissive LCD • Rely entirely on Backlight for displaying image  × • Good contrast • Good color saturation • High brightness • High power consumption (Use of Backlight) • Poor readability in bright environment e.g. under sunlight

  8. What is TFT LCD– Reflective TFT-LCD • Rely entirely on ambient light for displaying image  × • Very low power consumption • Compact • Light weight • Sunlight readable • Poor readability in dark environment • Low contrast • Poor color saturation

  9. What is TFT LCD–Transflective TFT-LCD Combine together • Good readability under any ambient light level !

  10. What is TFT-LCD – working principle Electric field No Electric field

  11. What is TFT LCD– working principle

  12. What is TFT-LCD —Panel size evolution

  13. How to produce a TFT-LCD • TFT-LCD Fabs – Size Matters • TFT-LCD Fabs come in a range of generations – from Generation 1 to Generation 7.5. The major difference between generations is the size of the mother glass. The larger the mother glass is, the larger the panel that can be produced. A Generation 7.5 mother glass, for example, is larger than a king size mattress at 195cm x 225 cm, and can optimally be cut into eight 42 or six 47(inch,diagonal) panels.

  14. Applications Consumer product display Information Technology display Television display

  15. TFT LCD Process RGB Coating RGB RGB Patterning RGB Developing Inspection CF 製 程 BM Deposit Photo Process Etch Process Back glass Front glass T F T 製 程 Thin Film Deposit Process Color Filter Photo-lithography Process Etch Process TFT Device Test Array Process Alignment Layer Coat LCD 製 程 LC Alignment Process TFT/CF Alignment Cell Process LC Filling Process LCD Panel Test

  16. TFT Manufacturing Process

  17. Color Filter Manufacturing Process

  18. Cell Manufacturing Process LC arrangement along rubbing direction polyimide

  19. Targets applied in TFT-LCD manufacturing

  20. Targets applied in TFT-LCD manufacturing • Array / Color Filter Cr:BM ITO: electrode Mo/Al/Mo: electrode, conductive line

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