ppt on LCD and LED
- 1. Shree Swami Atmanand Sarswati Institute of Technology Subject :-Computer Aided Design(2161903)
- 2. INDEX Sr No. Topics 1. Pixels 2. LCD • Applications 3. LED • How it works • Inside LED • Applications 4. LED Displays VS. LCD Displays
- 3. Pixels Faceplate picture element (pixels) are formed by depositing and patterning a black matrix, standard red, green, and blue TV phosphors and a thin aluminum layer to reflect colored light forward to the viewer.
- 4. LCD • Most mature flat panel technology • Major share of FPD market • Poor intrinsic viewing angle • Requires backlight • Inefficient • Slow • Effected by Temperature and sunlight
- 5. Applications:- Computer monitors Television Instrument panels Aircraft cockpit displays Gaming devices Video players Clocks and watches Calculators Mobiles Etc…
- 6. LED Light-emitting diode Semiconductor Has polarity
- 7. LED: How It Works When current flows across a diode Negative electrons move one way and positive holes move the other way
- 8. The wholes exist at a lower energy level than the free electrons Therefore when a free electrons falls it losses energy This energy is emitted in a form of a photon, which causes light The color of the light is determined by the fall of the electron and hence energy level of the photon
- 9. Inside a Light Emitting Diode 1. Transparent Plastic Case 2. Terminal Pins 3. Diode
- 10. Applications:- Traffic lights Televisions Camera flashes Automotive headlamps Medical devices
- 11. LED Displays VS. LCD Displays