LED教学课件（英文版）.pptVIP

LIGHT EMITTING DIODES Presentation by Evren EKMEK?? About LEDs (1/2) How Does A LED Work? (1/2) How Does A LED Work? (2/2) Testing LEDs How Much Energy Does an LED Emit? Finding the Energy from the Voltage Applications Sensor Applications Medical Instrumentation Bar Code Readers Color Money Sensors Encoders Optical Switches Fiber Optic Communication Mobile Applications Mobile Phone PDAs Digital Cameras Lap Tops General Backlighting  Sign Applications Full Color Video Monochrome Message Boards Traffic/VMS Transportation - Passenger Information  Automative Applications Interior Lighting - Instrument Panels Switches, Courtesy Lighting Exterior Lighting - CHMSL, Rear Stop/Turn/Tail Truck/Bus Lighting - Retrofits, New Turn/Tail/Marker Lights Signal Appications Traffic Rail Aviation Tower Lights Runway Lights Emergency/Police Vehicle Lighting LEDs offer enormous benefits over traditional incandescent lamps including: Energy savings (up to 85% less power than incandescent) Reduction in maintenance costs Increased visibility in daylight and adverse weather conditions Illumination (1/2) Illumination (2/2) Indication Household appliances VCR/ DVD/ Stereo and other audio and video devices Toys/Games Instrumentation Security Equipment Switches Driving LEDs Analog LED Drive Circuits Digital LED Drive Circuits Analog LED Drive Circuit Digital LED Drive Circuits Colours of LEDs (1/3) Colours of LEDs (2/3) Colours of LEDs (3/3) Comparison Of Chip Technologies For Wide-Angle, Non-Diffused LEDs LED Performance (1/8) Color White light Intensity Eye safety information Visibility Operating Life Voltage/Design Current LED Performance (2/8) LED Performance (3/8) White Light When light from all parts of the visible spectrum overlap one another, the additive mixture of colors appears white. However, the eye does not require a mixture of all the colors of the spectrum to perceive white light. Primary colors from the upper, middle, and lower part