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- 2. CONTENTS • Introduction • Inventionsof LCD • What is LCD • Working of LCD • Types of LCD • Applications of LCD • Advantages and Disadvantages
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- 4. INVENTIONS OF LCDDISPLAY Discovery of Liquid Crystal Display - In year 1888 by Freidrich Reinitzer - Innovation - 1963 by Richard Williams & George Heilmeier Suggest using liquid crystal for making a display device. - 1968 , The First operational LCD created by RCA using Dynamic Scattering Method (DSM) - In year 1971, First LCD using Twisted Nematics Produced
- 5. WHATIS LCD? A LiquidCrystal Display (LCD) is a thin, flat panel used for electronically displaying information such as text, images, and moving pictures.
- 6. BASICS OF LCD Itis a combination of two states of matter, the solid and the liquid state. LCD uses liquid crystal to produce visible image. LCD are super thin display screen compared to CRT display. It includes several layers, where liquid crystal layer is sandwiched between some layers Light is projected from the lens, and based on liquid crystal orientation, image is displayed on the screen.
- 7. WORKING OF LCD CCFLlight Source 2. LCD requires back light as they do not emit light. 3. When electrical signal is given to liquid crystal, its orientation is getting change and based on orientation polarized light will pass through it. 4. So blocking of light is been done based on electrical signal applied to liquid crystal. 1. It works based on blocking of light. It does not emit light. Liqui d cryst al (Diff. colors) O/P Crystal
- 8. STRUCTURE OF LCD Fluorescent BackLight (CCFL) Polarizing Films Negative Coating Liquid Crystal Positive Coating Polarizing Films Glass Cover
- 9. WHY LCD? Smaller Size–LSD’s occupy approximately 60% less space than CRT displays an important when office space is limited. Lower power Consumption –LCD’s typically consume about half the power and emit much less heat than CRT display. No electromagnetic field –LCD’s do not emit electromagnetic field and are not susceptible to them thus, they are suitable for use in areas where CRT’s cannot be used. Longer Life – LCD’s have a longer useful life than CRT.
- 10. TYPES OF LCD 1.Twisted Nematic (TN) Twisted Nematic LCDs are the most commonly manufactured and used types of monitors across a wide range of industries. 2. IPS Panel Technology 3. VA Panel 4. Advanced Fringe Field Switching. 5. OLED (Organic Light-Emitting Diode) 6. AMOLED (Active-Matrix Organic Light-Emitting Diode)
- 11. ADVANTAGES OF LCD 1.LCD Monitors are very thin in shape and size. 2. They do not consume much electricity and emits less heat. 3. They are preferred over CRT monitors because of their size as they can be installed in small locations. 4. They do not affect any magnetic fields. 5. Very low power compared to CRT or Plasma.
- 12. Disadvantages of LCD 1.It needs an external source of light for displaying the image. 2. Its operating temperature range is limited that lies in between 0 to 60°C. 3. LCDs are less reliable display units. 4. The image visibility relies on light intensity. 5. They are slightly more expensive plasma flat panels. 6. They are very expensive as compared to CRTs.
- 13. APPLICATION OF LCD 1.The liquid crystal displays (LCDs) are used in aircraft cockpit displays. 2. It is used as a display screen in calculators. 3. For displaying images used in digital cameras. 4. The television is main applications of LCD. 5. Mostly the computer monitor is made up of LCDs. 6. The LCDs are commonly used in all the digital wrist watches for displaying time. 7. The LCDs are used in mobile screens. 8. It is also used in video players.
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