Sapphire Touch Performance and Design Guidelines for Display Cover Screens

Sapphire Touch Performance and Design Guidelines for Display Cover Screens

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Description: Sapphire Touch Performance and Design Guidelines for Display Cover Screens - IHS Business Conference, Overview of sapphire and its basic properties–Growth methodologies–Crystal properties, Sapphire material testing data. Third party testing results, New markets for sapphire cover screens, Building the supply chain for high volume applications. The Sapphire Solution - Sapphire Material - Scratchproof, Superior impact resistance, Superior mechanical strength, Outperforms glass alternatives.

Fabrication Engineering - Development of processes and consumables for low cost sapphire manufacturing, Development of processes for high strength windows. Design-In - High strength solutions designed around application, Enhanced touch sensitivity, Optimized performance taking advantage of different sapphire orientations. Supply Chain - Large install volume of sapphire manufacturers, Downstream fabrication for mobile cover screen manufacturing evolving.

What is Sapphire - Sapphire is a single crystal Al2O3(Alumina) It is transparent, however can be made to practically any color when combined with other materials, It is manufactured in high volume and sizes of over 280lbs, Its main industrial applications are currently HB - LED substrates, aerospace, armor, photonics, dental, lasers. Sapphire is Highly Durable and Scratch-Resistant Unscratchable by commonly found materials. Mechanical and Electrical Properties of Sapphire* Superior performance in key metrics that matter for cover and touch sc ...Please navigate Paper pages for more details.

 
Author: GT Advanced Technologies (Fellow) | Visits: 1974 | Page Views: 3053
Domain:  High Tech Category: Displays Subcategory: Manufacturing 
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Contents:
Sapphire Touch Performance and Design
Guidelines for Display Cover Screens

IHS Business Conference
May 22, 2013
©2013 GTAT Corporation. All rights reserved.

Agenda
• Overview of sapphire and its
basic properties
– Growth methodologies
– Crystal properties
• Sapphire material testing
data
– Third party testing results
• New markets for sapphire
cover screens
• Building the supply chain for
high volume applications

©2013 GTAT Corporation. All rights reserved.

2

The Sapphire Solution
Sapphire Material

Design-In

• Scratchproof

• High strength solutions
designed around application

• Superior impact resistance
• Superior mechanical strength
• Outperforms glass alternatives

• Enhanced touch sensitivity
• Optimized performance taking
advantage of different sapphire
orientations.

Fabrication Engineering

Supply Chain

• Development of processes and
consumables for low cost
sapphire manufacturing

• Large install volume of sapphire
manufacturers

• Development of processes for
high strength windows.

• Downstream fabrication for
mobile cover screen
manufacturing evolving

©2013 GTAT Corporation. All rights reserved.

3

What is Sapphire
• Sapphire is a single crystal
Al2O3 (Alumina)
• It is transparent, however can
be made to practically any
color when combined with
other materials
m
a

• It is manufactured in high
volume and sizes of over
280lbs

a

m

a

n

n

• Its main industrial applications
are currently HB-LED
substrates, aerospace, armor,
photonics, dental, lasers.

m

r

a

C

R
m

m
s
a
m

a

©2013 GTAT Corporation All rights reserved.

4

GT’s Expanding Product Portfolio
Broadest range of sapphire production equipment
• Sapphire growth technologies
– ASF, KY, EFG
– Growth method tailored for end
application
KY

ASF

EFG

• Sapphire inspection tools
– Improves yields and quality of
material entering downstream
production
Automated sapphire inspection

• Sapphire annealing furnace
– Key technology for production of
sapphire cover screens
Annealing furnace

©2013 GTAT Corporation. All rights reserved.

5

Sapphire is Highly Durable and Scratch-Resistant
Unscratchable by commonly found materials
Moh's
Common Items
Hardness
10

Diamond

9

Sapphire

8

Alon, Spinel

7

Granite, Gorilla Glass, Dragontrail, Xensation, Sand

6

Float Glass, Steel

5

Knife, Keys, Copper, Concrete

4

Gold

3

Salt, Fingernail

2

Plastic, Marble

1

Talcum Powder

©2013 GTAT Corporation. All rights reserved.

7

Mechanical and Electrical Properties of Sapphire*
Superior performance in key metrics that matter for cover and touch screens

* Industry sources
©2013 GTAT Corporation. All rights reserved.

4

Crystal Properties Vary by Orientation
Designers Can Leverage Orientation for Improved Device Performance
c
Face
Plane

c
a
m

Hardness
(kg/mm2)

Flexural
Strength
Face
(MPa)

Flexural
Strength
Edge
(MPa)

Flexure
Strength

Dielectric
Field
Shape

Dielectric
Constant
(ɛ)

Fabrication
Cost

2200

1035

1540

isotropic

isotropic

11.5

lowest

1800

1540

1035

anisotropic

anisotropic

9.3

normal

1800

1540

1035

anisotropic

anisotropic

9.3

normal

• Protected edge design; a & m planes
– strongest flexural strength of face

• Exposed edge design; c-plane






strongest edges
hardest surface
highest dielectric constant
even mechanical strength in all directions
even dielectric field
source: http://www.cidraprecisionservices.com/products-services-crystalline-sapphire.html
©2013 GTAT Corporation. All rights reserved.

8

ASF® Sapphire vs. Gorilla Glass
GT Sapphire Outperformed Gorilla Glass in Mechanical Strength
Ring-on-Ring (Flexure Strength)
• Unscratched ASF® sapphire is 1.4X
stronger than unscratched GGII.
• Scratched ASF® sapphire is 2.3X stronger
than scratched GGII.
• Unscratched ASF® sapphire is 3.1X
stronger than scratched GGII.
Instron Impact Test

Impact
• Unscratched ASF® sapphire is 2.2X
stronger than unscratched GGII.
• Scratched ASF® sapphire is 5.3X stronger
than scratched GGII.
• Unscratched ASF® sapphire is 8.1X
stronger than scratched GGII.

Instron Ring-on-Ring Test
Ring on Ring Test

Material
Gorilla Glass II
GT ASF

Impact Test

Sample Profile

Average Failure
Load (N)

Average Failure
Load (N)

Unscratched
Diamond Scratched
Unscratched
Diamond Scratched

1482.1
672.5
2065.2
1539.4

717.4
198.1
1609.5
1059.8

*3rd party, independent testing results

Sapphire outperformed GG2 on all mechanical strength tests.

©2013 GTAT Corporation. All rights reserved.

9

Dielectric Constant
Sapphire’s dielectric constant is 30 to 60% higher than glass.
Cover Screen Material

Dielectric Constant

strengthened glass

7.2

a & m-plane sapphire

9.4

c-plane sapphire

11.5

Drive Electrode

Receive Electrode

Drive
Buffer
Collected Charge





a & m-plane dielectric constant is 30% higher than glass.
c-plane dielectric constant is 60% higher than glass.
The capacitive field is 155% stronger for the same distance through cplane sapphire than through the same distance of strengthened glass.
©2013 GTAT Corporation. All rights reserved.

10

Dielectric Constant – Test Results
Sapphire’s dielectric constant allows for optimized touch sensitivity
touch
measurement
1
2
3
4
5
6
7
8
9
average
SD

GG2
1,448
1,507
1,274
1,632
1,374
1,440
1,625
1,692
1,632
1,514
141

ASF
Sapphire
2,170
1,870
2,230
2,290
1,930
2,330
2,245
1,912
2,339
2,146
189

• Evaluation performed on a film-based
laminated touch sensor.
• In actual touch performance testing, sapphire
signal strength was 42% higher than for GG2.
©2013 GTAT Corporation. All rights reserved.

11

GT Will Enable High Volume, Low Cost Supply
Increasing capacity delivering low cost cover screens
Supply-Chain Development
• Large install volume of sapphire
manufacturers
• Downstream fabrication
facilities moving towards higher
volume manufacturing
– Conversion of glass fabrication to
sapphire fabrication
– Upgrade and conversion of HBLED manufacturing
– Greenfield sapphire cover screen
factories

©2013 GTAT Corporation. All rights reserved.

12

Wide Range of Applications for Sapphire
Sapphire delivers superior performance

• Industrial and hazardous
environment
• Commercial and construction
• Sensor windows

OEM
Smartphones

Ruggedized
Devices

POS / Retail

Emergency
Response
Electronics

Factory
Automation

ATM/
Financial

Enterprise
Electronics

Taxi and
Casino
Displays

Laser and
Optical
Scanners

Information
Kiosks

• Impact resistant devices
• Field and military devices

©2013 GTAT Corporation. All rights reserved.

13

Enabling High Volume Consumer Applications
Sapphire is ideal for mobile applications

Camera Covers

Watches

Smartphones and tablets

Replacement Screens,
Screen Protectors

©2013 GTAT Corporation. All rights reserved.

14

Thank you

©2013 GTAT Corporation. All rights reserved.

15