Willow® Glass ©2014 Corning Incorporated 1
Corning® Willow® Glass
Dr. Dipak Chowdhury
Corning Incorporated
March, 2014
Willow® Glass ©2014 Corning Incorporated 2
Corning Market Segments and Additional Operations
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Substrates
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for OLED and
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Advanced Glass,
LLC (SCG)
Founded HQ Employees 2013 Sales Fortune 500 rank (2013)
1851 Corning, NY ~30,000 WW ~$8.0B 326
Willow® Glass ©2014 Corning Incorporated 3
1947
Processes
for mass
producing
the television
bulb
1879
Glass envelope for
Thomas Edison’s
light bulb
1915
Heat-resistant
PYREX® glass
1970
First low-loss
optical fiber
1982
Active matrix
liquid crystal
display (LCD)
glass
1934
Dow
Corning
silicones
1952
Glass
ceramics
2006
Label-free
screening
platform for
drug
discovery
A Culture of Innovation
1972
Ceramic
substrates
for
automotive
catalytic
converters
1964
Fusion
overflow
process
Environmentally
conscious
LCD glass
Ultra-
bendable
fiber
2007
Thin, lightweight
cover glass with
exceptional
damage
resistance
Willow® Glass ©2014 Corning Incorporated 4
Rigid material can be made flexible by reducing the thickness
Willow® Glass ©2014 Corning Incorporated 5
What is Corning® Willow® Glass? Benefits of current display glasses but thinner, flexible and with lower processing cost
Same Display Glass Attributes
New Glass Processing, Same Glass
Manufacturing
New Delivery
New Thickness and Dimensions
Value for Customer
Proprietary fusion
process + roll-to-roll
processing
100 and 200um
Thickness
≤1m x ≤300mm Spools
or
≤Gen 5 Sheets + + =
• Thin, light and conformable
• Dimensional stability at high temperature
• Optically pure
• Ultimate barrier
• Mechanical, UV and chemical resistance
• Superior surface quality
• Low cost to produce and to process (R2R)
Alkali free,
borosilicate
composition
Willow® Glass ©2014 Corning Incorporated 6
Corning’s proprietary fusion glass process, which has enabled
the flat panel display industry, makes flexible glass possible
Willow® Glass ©2014 Corning Incorporated 7
Fusion draw has superior glass surface quality compared to
polymer films
** Ruchi Yongsunthon
Fusion Glass (AFM Measurements)
PEN Teonex Q65FA (AFM Measurements)
Willow® Glass ©2014 Corning Incorporated 8
The optical transmission of Corning® Willow® Glass exceeds
existing polymer films in the market
Bare Substrate (Optical Transmission Measurements)
ITO Coating (Optical Transmission Measurements)
Corning® Willow® Glass
Corning® Willow® Glass
Willow® Glass ©2014 Corning Incorporated 9
Corning® Willow® Glass offers dimensional stability and
process compatibility, which enables finer resolution patterning
GLA
SS
P
EN
P
OLY
IMID
E
25 oC 150 oC
25 oC
150 oC
150 oC
25 oC
Willow® Glass ©2014 Corning Incorporated 10
Corning® Willow® Glass provides superior barrier performance
and is a benchmark for encapsulation technologies
MOCON Aquatron (Next-Generation Prototype)
Georgia Tech (Ca Patch Electrical Sensor)
Corning Incorporated (Ca Patch)
• 50°C, 100% RH
• ≤ 5x10-5 g/m2-day
• Below detection
limit
• 50°C, 85% RH
• ≤ 5x10-5 g/m2-day
• Limited by edge
seal performance
• Corning® Willow ® Glass
vs. polymer
• Room temperature
• After 1 week
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Going thinner reduces bend stress and enables flexibility for
roll-to-roll processing
700 m
200 m
50 m
Thickness
100 m
Glass bending stress is a
function of thickness
Laser Cut
Edge
Mechanical
Score Edge
2-point
Bend
Testing
Equipment
The strength of glass is
influenced by the edge
cutting quality
Willow® Glass ©2014 Corning Incorporated 12
Numerous applications would benefit from Corning® Willow® Glass
Touch sensor
and OLED
encap
Color filter for
LCD & OLED TFTs and
Full displays
General signage
Printed antenna
Passive matrix
display
Smart window
Flexible display
OLED lighting
Energy storage
and harvesting
General lighting
Advanced
Substrate
Substrate
Barrier
Willow® Glass ©2014 Corning Incorporated 13
Glass web roll-to-roll touch sensor fabrication demonstrated
by ITRI in collaboration with CAMM and Corning
Vacuum Deposition Laser Patterning Film Lamination Screen Printing
Laser ablation
process
Demonstrated 30µm
± 3µm lines and
spaces
S. Garner, G. Merz, J. Tosch, C. Chang, J. Lin, C. Kuo, J. Tseng, M. Chang, S. Lewis, R. Kohler, L. Tian, L. Simpson,
M. Owens, X. Li, S. Huang, J. Shih, A. Wei, M.C. Lin, C.S. Huang, H.T. Lin, C.L. Lin, S.Y. Chang, C.T. Wang, J. Shen,
C.H. Hsiao, S.T. Lu, J. Hu, C.T. Liu, H.Y. Lin, W.S. Yang, C.C. Su, J. Switzer, J. Steiner, “Ultra-Slim Flexible Glass for
Electronic Application,” 2012 MRS Fall Meeting, Boston, Nov. 28, 2012.
PMMA-OCA film
laminated to 100µm
flexible glass web
Ag-ink conductor
lines and bridges;
110µm width,
<20µm height
<150°C cure
Sputtered ITO
50 W/sq ITO layer,
70nm thick
3% sheet resistance
variability on the web
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Summary
• Introduced in 2012, Corning® Willow® Glass builds on a rich history
of innovation
• Our vision is to help manufacturers process glass more efficiently
through a roll-to-roll system
• We also provide carrier solution for compatibility with high
temperature (≤ 600°C) flat glass processing, e.g., TFT, CF, & OLED
• Glass has clear advantages compared to polymer in smoothness,
light transmission, hermeticity, and dimensional stability
• Corning is developing the eco-system needed for adoption of
flexible glass
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