LCD & LED TV TechnologiesPresentation on

Department of Computer Science & EngineeringFaculty of Engineering

University of Development Alternative (UODA)

Submitted to

Md. Ashek Al AzizAssistant professor

Dept. of Computer Science & EngineeringFaculty of Engineering

University of Development Alternative (UODA)

Participants

Mohammad Ali KhanID: 011131035

Jakir HossainID:011131036

Sadia AfrinID: 011131016

Jafrin AkterID: 011131039

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

Liquid Crystals (LC)

What’s Liquid Crystals Display (LCD)

Different types of LCDs

There are Two type of LCDs available

1.Passive Matrix LCDs 2.Active Matrix LCDs

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

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

Advantages & Disadvantages of LCD

LCD Advantages Brightness Emissions Geometric Distortion Screen Shape

LCD Disadvantages Aspect Ratio Contrast Viewing Angle

Applications of LCD

Thin Film Transistor (TFT) Alpha-numeric displayBack lighting systemsFor brighter displays

What’s LED

Type of DRIVING LED

Two type of DRIVING LED

Analog LED Drive Circuits

Digital LED Drive Circuits

Some Types of LEDs

Bargraph 7-segment Starburst Dot matrix

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.

Applications of LED

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

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