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
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