This document compares and contrasts LCD and LED display technologies. It discusses the basic principles of liquid crystals and how they enable LCD displays. It describes the different types of LCDs including passive matrix and active matrix. It then discusses LED display technology, including the types of LED driving and different LED displays. It provides the advantages and disadvantages of both LCD and LED as well as common applications for each type of display technology. Finally, it summarizes the key differences between LCD and LED displays.

1. LCD & LED TV Technologies
Presentation on
Department of Computer Science & Engineering
Faculty of Engineering
University of Development Alternative (UODA)

2. Submitted to
Md. Ashek Al Aziz
Assistant professor
Dept. of Computer Science & Engineering
Faculty of Engineering
University of Development Alternative (UODA)

3. Participants
Mohammad Ali Khan
ID: 011131035
Jakir Hossain
ID:011131036
Sadia Afrin
ID: 011131016
Jafrin Akter
ID: 011131039

4. Contents
• What’s Liquid Crystals (LC)
• What’s Liquid Crystals Display (LCD)
• Different types of LCDs
• LCD Display Technology
• Advantages & Disadvantages of LCD
• Applications of LCD
• What’s LED
• Type of DRIVING LED
• Some Types of LEDs
• Advantages & Disadvantages of LED
• Applications of LED
• Difference Between LCD & LED

5. Liquid Crystals (LC)

6. What’s Liquid Crystals Display (LCD)

7. Different types of LCDs
There are Two type of LCDs available
1.Passive Matrix LCDs
2.Active Matrix LCDs

8. Active Matrix V/S Passive Matrix LCDs
Passive Matrix LCD Active Matrix LCD
• Allow very high resolution
• It isn`t limited to about 50
rows
• Each sub-pixel is individually
controlled by an isolated
thin-film transistor (TFT).
• More use in Laptop & TV
• Allow high resolution
• It is usually limited to about 50
rows
• Each sub-pixel is not individually
controlled by an isolated thin-
film transistor (TFT).
• Less use in Laptop & TV

9. LCD Display Technology
• Technology Enhancements:
– Better color through corrected CCFLs, LEDs
– Improved black levels (compensating films)
– Higher contrast (pulsed backlights)
– Wider viewing angles (compensating films)
– Higher resolution (1920x1080)
– Improved LC twist times

10. Advantages & Disadvantages of LCD
LCD Advantages
 Brightness
 Emissions
 Geometric Distortion
 Screen Shape
LCD Disadvantages
 Aspect Ratio
 Contrast
 Viewing Angle

11. Applications of LCD
Thin Film Transistor (TFT)
Alpha-numeric display
Back lighting systems
For brighter displays

12. What’s LED

13. Type of DRIVING LED
Two type of DRIVING LED
 Analog LED Drive Circuits
 Digital LED Drive Circuits

14. Some Types of LEDs
Bargraph 7-segment Starburst Dot matrix

15. Advantages & Disadvantages of LED
Advantages
• It is very cheap.
• Very simple electronic circuits.
• It is reliable.
• It is efficient
• Life span : Around 100,000 hours
• Screen size : Up to 90 inches
Disadvantages
• Restriction to only 16 hexadecimal figures.
• Low quality LEDs may cause pollution to environment.
• May result in more e-wastes.

16. Applications of LED
 Smartphone
 Tablet Pc
 Ebook
 Ultrabook/Notebook
 Video Camera
 Media Player
 Portable Game
 GPS
 Automotive
 LED TV
 Lighting
 Smart Metering

17. Difference Between LCD & LED
LED
• Power Consumption is
less
• Faster response rate
time
• Sizes Available
17inches and 70inches.
• Color Accuracy is less
• Cannot be extremely
slim
LCD
• Power Consumption is
more
• Slower response rate
time
• Sizes Available
15inches to 65 inches
• Color Accuracy is more
• Can be extremely slim