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Corning® Willow® GlassFlexible Glass Enabling Advanced Product Applications and Next-Generation Manufacturing
Casey KangSenior Manager, Commercial TechnologyCorning Incorporated
November 21, 2013
Willow® Glass © 2013 Corning Incorporated 2
Rigid material can be made flexible by reducing the thickness
Willow® Glass © 2013 Corning Incorporated 3
Introduced in 2012, Corning® Willow® Glass builds on a rich history of glass innovation
Willow® Glass © 2013 Corning Incorporated 4
Our vision is to help manufacturers process glass more efficiently through a roll-to-roll system
Willow® Glass © 2013 Corning Incorporated 5
Corning’s proprietary fusion glass process, which has enabled the flat panel display industry, makes flexible glass possible
Willow® Glass © 2013 Corning Incorporated 6
Fusion draw has superior glass surface quality compared to polymer films
** Ruchi Yongsunthon
Fusion Glass(AFM Measurements)
PEN Teonex Q65FA(AFM Measurements)
Willow® Glass © 2013 Corning Incorporated 7
The optical transmission of Corning® Willow® Glass exceeds existing polymer films in the market
Bare Substrate(Optical Transmission Measurements)
ITO Coating(Optical Transmission Measurements)
Willow® Glass © 2013 Corning Incorporated 8
Corning® Willow® Glass offers dimensional stability and process compatibility, which enables finer resolution patterning
GLA
SS
PE
NP
OLYIM
IDE
25 oC 150 oC
25 oC
150 oC
150 oC
25 oC
Willow® Glass © 2013 Corning Incorporated 9
Corning® Willow® Glass provides superior barrier performanceand 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• 6x10-5 g/m2-day• Limited by edge
seal performance
• Corning® Willow® Glass vs. polymer
• Room temperature• After 1 week
Willow® Glass © 2013 Corning Incorporated 10
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 determined by the edge
cutting quality
Willow® Glass © 2013 Corning Incorporated 11
Corning provides technical application support to enable roll-to-roll processing and handling of flexible glass
Sheets of flexible glass are handled differently than sheets of
rigid or thicker glass
Roll-to-roll processing of 100 micron thick glass has
been demonstrated
Willow® Glass © 2013 Corning Incorporated 12
Corning® Willow® Glass targets two product applications
Printable semiconductor& other active layers
1. Flexible Patterning Substrate 2. Transparent Barrier Superstrate
Encapsulation layer
High Temp Processing
Dimensional Stability
Light Weight
Moisture & O2 Barrier
High Transmission
Light Weight
Willow® Glass © 2013 Corning Incorporated 13
Numerous applications would benefit from Corning® Willow® Glass
Touch sensor and OLED
encap
Color filter for LCD & OLED
TFTs andFull displays
General signage Printed antenna Passive matrix display Smart window
Flexible display
OLED lightingEnergy storage and harvestingGeneral lighting
Willow® Glass © 2013 Corning Incorporated 14
Glass web roll-to-roll touch sensor fabrication demonstrated by ITRI in collaboration with CAMM and Corning
Vacuum Deposition Laser Patterning Film LaminationScreen 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 ITO50 /sq ITO layer,
70nm thick3% sheet resistance variability on the web
Willow® Glass © 2013 Corning Incorporated 15
Corning, in collaboration with ITRI, demonstrated roll-to-roll processing to develop touch sensor on Corning® Willow® Glass
ITRI Taiwan demonstrated ITO patterning on 500mm width
Corning® Willow® Glass
3.5” Multi-Touch Sensor was singulated from the glass web
and assembled
Willow® Glass © 2013 Corning Incorporated 16
Corning is developing the eco-system needed for adoption of flexible glass
External Eco-system
• Glass handling knowledge (rolls & sheets)• High strength cutting guidance• End application design
• Fusion process• Glass expertise• Technical service
Corning
Willow® Glass © 2013 Corning Incorporated 17
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
• 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