Jack Pinches

INFO410 & INFO350 S2 2015

INFORMATIONSCIENCE

Display Technology

INFO410 S2 2015 Display Technology SLIDE 2INFORMATION SCIENCE

Outline

CRT Plasma Display LCD Projectors

DLP LCD

https://0.s3.envato.com/files/20601835/Pixels.jpg

INFO410 S2 2015 Display Technology SLIDE 3INFORMATION SCIENCE

http://electronics.howstuffworks.com/tv3.htm

Electrons (-) attracted to anode (+)

Electron beam flies through vacuum,hits the flat screen.

Screen phosphor coated.

Cathode Ray Tube (CRT)

INFO410 S2 2015 Display Technology SLIDE 4INFORMATION SCIENCE

Cathode Ray Tube (CRT)

1. Electron guns2. Electron beams3. Focusing coils4. Deflection coils5. Anode connection6. Mask7. Phosphor layer8. Phosphor inner

close up

https://en.wikipedia.org/wiki/Cathode_ray_tube#/media/File:CRT_color_enhanced.png

INFO410 S2 2015 Display Technology SLIDE 5INFORMATION SCIENCE

http://electronics.howstuffworks.com/tv10.htm

Shadow mask Holes aligned with phosphor Fire beam as needed.

Cathode Ray Tube (CRT)

INFO410 S2 2015 Display Technology SLIDE 6INFORMATION SCIENCE

Health Concerns: Ionizing radiation Toxicity Flicker High frequency noise

Advantages: Good black level Reliable Viewing angle

Disadvantages: Bulky Power consumption Burn in Screen size limited

Cathode Ray Tube (CRT)

INFO410 S2 2015 Display Technology SLIDE 7INFORMATION SCIENCE

Burn in example

https://upload.wikimedia.org/wikipedia/en/9/97/Emerson-McDonalds_CNN_Burn-In.jpg

INFO410 S2 2015 Display Technology SLIDE 8INFORMATION SCIENCE

Plasma Display Panel (PDP)

http://electronics.howstuffworks.com/plasma-display2.htm

Tiny cells containing gas Voltage causes plasma Releases UV photons Photons interact with phosphor

INFO410 S2 2015 Display Technology SLIDE 9INFORMATION SCIENCE

Plasma Display Panel (PDP)

Advantages: Produce deeper blacks High refresh rate and

response time Cheaper?

Disadvantages: Screen burn in Bulkier High power consumption Altitude requirements

INFO410 S2 2015 Display Technology SLIDE 10INFORMATION SCIENCE

Liquid Crystal Display (LCD)

Backlight Millions of pixels Polarizing filters Liquid crystal

http://www.explainthatstuff.com/lcdtv.html

INFO410 S2 2015 Display Technology SLIDE 11INFORMATION SCIENCE

Liquid Crystal Display (LCD)

1) Backlight2) Horizontal filter3) Horizontal light waves4) Electricity off5) Vertical light waves6) Vertical filter7) Pixel lit

http://www.explainthatstuff.com/lcdtv.html

INFO410 S2 2015 Display Technology SLIDE 12INFORMATION SCIENCE

Liquid Crystal Display (LCD)

Advantages: Thinner, lighter Lower power consumption Lower radiation emission Size variability

Disadvantages: Image persistence Black levels can be poor Dead pixels Viewing angle Fixed colour depth

INFO410 S2 2015 Display Technology SLIDE 13INFORMATION SCIENCE

Projectors

Light Emitting Diode Projector (LED) Liquid Crystal Display Projector (LCD) Digital Light Processing Projector (DLP)

Two general types: Transmissive Reflective

INFO410 S2 2015 Display Technology SLIDE 14INFORMATION SCIENCE

DLP Projector

http://www.ti.com/lsds/ti/dlp-technology/about-dlp-technology/how-dlp-technology-works.pagehttps://en.wikipedia.org/wiki/Digital_Light_Processing#/media/File:DLP_Logo.svg

DLP chip: Digital Micromirror Device

(DMD) Array of mirrors (reflective) Up to 8.8 million Hinges, independent

movement

INFO410 S2 2015 Display Technology SLIDE 15INFORMATION SCIENCE

Spinning Wheel

Beam of light

DMD chip

Lens Projection Screen

DLP Projector

INFO410 S2 2015 Display Technology SLIDE 16INFORMATION SCIENCE

DLP Projector

Advantages: Fully sealed chip Convergence (single chip) Image persistence Projector size Colour degradation

Disadvantages: Colour wheel not sealed Rainbows Restricted zoom capabilities Representation of greys

INFO410 S2 2015 Display Technology SLIDE 17INFORMATION SCIENCE

LCD Projector

LCD panel Tiny cells Mirrors divide light Three panels Combiner/Prism

http://www.projectorpoint.co.uk/images/LCDProjectorworks.gif

INFO410 S2 2015 Display Technology SLIDE 18INFORMATION SCIENCE

LCD Projector

Advantages: No moving parts Generally less expensive than DLP Support use with zoom lenses Sharper image

Disadvantages: Pixels can burn out Dust can interfere Limited lifetime Black levels Size and weight Image persistence

INFO410 S2 2015 Display Technology SLIDE 19INFORMATION SCIENCE

ResourcesTitle Slide Image: http://www.smarttvradar.com/wp-content/uploads/2013/01/tv.jpg http://www.displaymate.com/ShootOut_Comparison.htm http://www.explainthatstuff.com/lcdtv.html https://www.youtube.com/watch?v=qOsibeDX8jM http

://www.ebay.com/gds/Understanding-the-Differences-between-LED-LCD-and-DLP-Projectors-/10000000177630814/g.html

http://www.projector-guide.com/projector-guide/projector-structure/lcd-disadvantages.html