advanced display technology - cornell university
TRANSCRIPT
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Lecture 13
October 15, 2020
Imaging in the Electronic Age
Donald P. Greenberg
Advanced Display Technology
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Liquid Crystal Color Display
Scientific American, November 1997
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How can we extend this technology to color?
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3-Chip DLP Color Optical System
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DLP Projection System
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Digital Micromirror Devices (DMD)
• Pioneered by Texas Instruments. The research on these micromechanical
(MEMs) devices started in 1977.
• The first digital light valve projection systems (DLPs) had mirrors measuring
17 microns per side. At 1280 x 1028 resolution (HDTV) this resulted in a
rather large chip in 1996.
• Today this technology is used in almost all digital theaters and some home
televisions.
• Most theaters now use DLP with 4K resolution (4096 x 2160)
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Christie CP4230 Digital Cinema Projector
• 4K DLP
• Screen size up to 105ft (32m)
• 4096 x 2160 resolution
• 2100:1 contrast
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LCD’s
Plasma
Projection
TV’s
Price $
Diagonal Inches
Cost of HDTV Displays
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Cost of HDTV Displays
LCD’s
Plasma
Projection
TV’s
Price $
Diagonal Inches
Note: Each year the
cross over points
keep moving to the
right.
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Smart Headlight
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Headlights- Carnegie Mellon
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• The quest for energy reduction
Modifications to Existing Technology
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GYRICON BEADSLIGHT STATE DARK STATE
ELECTRODE
How E-Paper Works
Scientific American, 11/2001, p. 54.
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The paper pulp of the future.
http://www2.parc.com/hsl/projects/gyricon/
Electronic Reusable Paper
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Nick Sheridon, Xerox PARC inventor of electronic reusable paper, and
Fereshteh Lesani show off the first roll produced by 3M partners.http://www2.parc.com/hsl/projects/gyricon/
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GYRICON BEADS
E INK MICROCAPSULES
LIGHT STATE DARK STATE
ELECTRODE
DARK STATELIGHT STATE NEGATIVELY
CHARGED
POSTIVELY
CHARGED
How E-Paper Works
Scientific American, 11/2001, p. 54.
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http://www.eink.com/technology/howitworks.html
Electronic ink is a straightforward fusion of chemistry,
physics and electronics to create this new material.
Flexible Electronic Paper Display
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Flexible Tablet-Sized Display From
L.G. Philips
LCD and E Ink Corporation
http://www.eink.com/
E-Ink MIT, Late 1990’s
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Plastic Logic 2000
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Kindle 9 2019
https://sixcolors.com/post/2019/04/review-kindle-paperwhite-2019-and-kindle-2019/
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The XO and One Laptop Per Child 2005
The custom XO display contains a reflective
layer between it’s backlight and the specially
formatted LCD layer, allowing it to turn high
ambient lighting conditions to it’s advantage.
The display is not only inexpensive ($30/unit),
but is also much easier on the eyes.
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Images Through Screen Doors
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Pixel Qi
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Pixel Qi 2008
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E-Paper The Quest for Color
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E-paper Technology 2019
Spectral displays are made of
millions of Microcapsules which
suspend the pigments in clear
fluid.
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E-paper Technology 2019
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E-paper Technology 2019
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SOFT LIGHT: Junji Kido of
Yamagata University shows off his
bright and smooth prototype OLED
system.
John Boyd. “Let There Be (a New Kind of) Light,” IEEE Spectrum, July 2007.
Organic LEDs (OLEDs) 2007
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Organic LEDs (OLEDs)
• Composed of a thin film of organic compounds and
conductive layers sandwiched between two electrodes
• When the charges recombine in the organic layer, energy
is released in the form of photons
• Can be made with fluorescent-based or phosphorescent
material
John Boyd. “Let There Be (a New Kind of) Light,” IEEE Spectrum, July 2007.
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Organic LEDs (OLEDs) Advantages
• In theory, the energy of this conversion could reach 100%
• Thickness can be measured in nanometers (extremely thin and lightweight)
excluding the substrate
• Can be manufactured in sheet form
• Can be put on a variety of substrates including flexible plastic
• Material is environmentally friendly (no harmful elements)
John Boyd. “Let There Be (a New Kind of) Light,” IEEE Spectrum, July 2007.
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Potential Uses
• Could be applied as wallpaper for illumination purposes
• Very bright and can replace light bulbs – already 4x more efficient than
light bulbs in terms of lumens/watt
• With ability to produce red, green, and blue (new), can be used for displays
John Boyd. “Let There Be (a New Kind of) Light,” IEEE Spectrum, July 2007.
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OLED schematic
http://en.wikipedia.org/wiki/Organic_light-emitting_diode#Working_principle
1. Cathode (-), 2. Emissive Layer, 3. Emission of radiation, 4 . Conductive Layer, 5. Anode (+)
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OLED Explanation
A. A voltage is applied across the OLED such that the anode is positive with
respect to the cathode. Electrons flow from cathode to anode.
B. Thus the cathode gives electrons to the emissive layer and the anode
withdraws electrons from the conductive layer (causing electron holes).
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OLED Explanation
C. Electrostatic forces bring the electrons and holes together and they
recombine.
D. In organic semiconductors, holes are more mobile than electrons. This
happens closer to the emissive layer.
E. The recombination causes an emission of radiation whose frequency is in the
visible region.
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Sony 11-inch OLED Panel 2007
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Sony 27-inch OLED Panel 2007
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• The quest for energy reduction
• The quest for size
Modifications to Existing Technology
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Cornell Panoramic Projection System
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NASA Ames Control Room
FutureFlight Center at NASA-Ames
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Stonybrook’s Reality Deck
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Stony Brook’s Reality Deck
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Samsung model S9 4K OLED TV, 98” behemoth 2013
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Samsung 110-inch 4K UHD TV 2014
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Samsung Curved OLED TV 55 inches
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LG UHD Display 2019
88’
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Crystal LED SONY 2020
16 ft, 8K
9 ft. 4K
$877,000
https://www.digitaltrends.com/home-theater/sonys-massive-
new-microled-display-stands-17-feet-tall-and-packs-16k-
resolution/
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Foldable Phones 2019
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Foldable Laptops 2019
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OLED TV RX
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Flexible Displays
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LG press-on 'wallpaper' TV under 1mm thick
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• The quest for size
• The quest for brightness
Modifications to Existing Technology
• The quest for energy reduction
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displays
-6 -4 -2 0 2 4 6 8
starlight moonlight indoor lighting sunlight
scotopic mesopic photopic
• poor contrast
• no color
• low acuity
• good contrast
• good color
• high acuity
luminance
(log cd/m2)
range of
illumination
Visual Adaptation
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Sunnybrook Display Technology
High resolution
colour LCD
Low resolution
Individually Modulated
LED array
High Dynamic Range
Display
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4K Ultra HD LG 2020
3840 x 2160 Pixels
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Quantum Dots
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Quantum Dots
• QD’s can generate spectrally narrow primaries
• Color can be easily controlled by quantum dot size
• QD technology is more cost-effective than OLED’s
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Color Control by QD Particle Size
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Quantum Dot Manufacture Nanosys/3M
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Quantum Dot Advantages
• Saves watts as almost all energy is converted into light
• QD’s are very small (1.5nm (violet) 5.0nm (red)) allowing
• Very high resolution (ppi)
• QD’s can support large flexible displays
• QD’s offer high brightness (50-100x) LED’s
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Quantum Dot Backlighting
LCD
Quantum Dots used to create even white Backlighting Light passes through RGB filters.
QDEF LCD
Quantum Dots use a Blue LED and the Blue quantum dots to energize the red and green
phosphors.
QD LED
Light from the Blue quantum dots pass directly through the black sub-pixels to
illuminate the display.
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Samsung Quantum Dot Display 2017
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• The quest for size
• The quest for brightness
Modifications to Existing Technology
• The quest for energy reduction
• The quest for larger gamut
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Color Gamut Comparison 2019
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Color Gamut 2020
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• The quest for size
• The quest for brightness
Modifications to Existing Technology
• The quest for energy reduction
• The quest for larger gamut
• The quest for resolution
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Retinal Displays
4. Viewing optics
3. Horizontal & vertical scanners
2. Modulated light sources
1. Drive electronics
Source image
Virtual Retinal Display primary components.
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This schematic diagram illustrates the functional components of a laser-
scanned display system.
Information Display, “A Helmet-Mounted Laser Display,” January 2000, vol. 16, no. 1, p. 13.
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End
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Liquid Crystal Display (LCD)
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QDEF LCD
Blue Quantum Dots
are used as backlights
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QD LCD
Blue Quantum Dots are
used to energize the red
and green phosphors and
the blue QD light
becomes the blue sub-
pixel