Ee2 chapter10 led
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This document is a chapter from an engineering essentials course that discusses light emitted devices. It describes three types of display formats: individual characters, segmented characters, and dot matrix characters. It explains the basic construction and operation of LEDs, including that they emit light when forward biased. It also describes common anode and common cathode 7-segment displays.
Ee2 chapter10 led
- 1. IT2001PA Engineering Essentials (2/2) Chapter 10 - Light Emitted Devices Lecturer Name lecturer_email@ite.edu.sg Nov 20, 2012 Contact Number
- 2. Chapter 10 - Light Emitted Devices Lesson Objectives Upon completion of this topic, you should be able to: Describe and demonstrate the operation of a LED 7- segment display. IT2001PA Engineering Essentials (2/2) 2
- 3. Chapter 10 - Light Emitted Devices Specific Objectives Students should be able to : List the 3 types of display formats: 1. Individual characters 2. Segmented 3. Dot matrix Describe the basic construction and operation of LED. Describe the operation of a common anode and common cathode 7-segment display. IT2001PA Engineering Essentials (2/2)
- 4. Chapter 10 - Light Emitted Devices 3 types of display formats Individual characters Segmented characters Dot matrix character IT2001PA Engineering Essentials (2/2) 4
- 5. Chapter 10 - Light Emitted Devices Individual characters Uses one display unit for every numeral alpha-numeral and symbol Number of display units increases with number of characters. IT2001PA Engineering Essentials (2/2) 5
- 6. Chapter 10 - Light Emitted Devices Segmented characters Consists of light-emitting segments on the same surface arranged so that activating the proper segments produces the desired character. a f b g e c d IT2001PA Engineering Essentials (2/2) 6
- 7. Chapter 10 - Light Emitted Devices Typical 7-segment presentations IT2001PA Engineering Essentials (2/2) 7
- 8. Chapter 10 - Light Emitted Devices Dot matrix characters Each character consists of 35 small LEDs arranged in a grid of 5 vertical columns and 7 horizontal rows to form a 5 X 7 dot matrix display. It is capable of displaying more alphanumeric characters. IT2001PA Engineering Essentials (2/2) 8
- 9. Chapter 10 - Light Emitted Devices IT2001PA Engineering Essentials (2/2) 9
- 10. Chapter 10 - Light Emitted Devices Light-Emitting Diode A PN junction diode made of a special material Gallium Dioxide which radiates light when current passes through the unit. Symbol of the LED IT2001PA Engineering Essentials (2/2) 10
- 11. Chapter 10 - Light Emitted Devices when the diode is forward-biased, it emits light. IT2001PA Engineering Essentials (2/2) 11
- 12. Chapter 10 - Light Emitted Devices Light-Emitting Diode Figure on next slide shows circuit connection where an LED is forward-biased. IT2001PA Engineering Essentials (2/2) 12
- 13. Chapter 10 - Light Emitted Devices Circuit connection where an LED is forward-biased. IT2001PA Engineering Essentials (2/2) 13
- 14. Chapter 10 - Light Emitted Devices Construction of an LED IT2001PA Engineering Essentials (2/2) 14
- 15. Chapter 10 - Light Emitted Devices Construction of an LED The plastic lens is important in directing and magnifying the small amount of light emitted by the LED chips The cathode of the LED is identified on the package by the flat side on the plastic. IT2001PA Engineering Essentials (2/2) 15
- 16. Chapter 10 - Light Emitted Devices LED in Segmented displays LEDs are available in segmented font or dot matrix font single character units or multi-digit package DIP 7-segment LED & 10-pin single-digit package Multidigit package IT2001PA Engineering Essentials (2/2) 16
- 17. Chapter 10 - Light Emitted Devices 7-segments Display Unit The segments are LEDs with either all the anodes connected to the supply or all the cathodes connected to the ground a +V b c a d b e c f d g e f g IT2001PA Engineering Essentials (2/2) 17
- 18. Chapter 10 - Light Emitted Devices Next Lesson IT2001PA Engineering Essentials (2/2) 18