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Paul Weindorf, Kong Lor, Soeren Lichtenberg, Steve Ponsock
5.1 Touch Sensor Transparent Conductor Optical Comparison
OutlineMotivation for Optical Study
Technology Overview
Transparent Conductor List
Optical Test Configuration
Test Data Summary
Conclusion
Page 2
Motivation for Optical StudyLots of new transparent touch screen technologies
are popping out of the woodwork
2D bendable Film Touch Sensors are needed for new curved lens designs
3D moldable touch screen technology is next for lens designs
Need to understand optical tradeoffs between different technologies
Page 3
2015 SID Symposium, Session 68.3, Power Point Presentation
ITOCopperMesh
SilverNW
CarbonNT
PEDOT
CopperMesh
HybridCopperMesh
Technology OverviewPEDOT
Page 4
PEDOT Principles and Applications of an Intrinsically Conductive Polymer by A. Elschner, S. Kirchmeyer, W. Lovenich, U. Merker and K. Rueter CRC Press
Provided courtesy of Heraeus
Technology OverviewCarbon NanoBud®
Page 5
2015 SID Symposium, Session 68.3, Power Point Presentation (both figures)
Technology OverviewCopper Mesh
Page 6
Copper
Figure 2.3-1. XTouch™ Hybrid-Metal SEM (courtesy
of Unipixel)
Technology OverviewSilver NanoWire
Page 7
https://www.fusionuv.com/UV_In_The_News_Fall_2010.aspx
Transparent Conductor List
Page 8
Type of Conductor Substrate Configuration Ω/□ CommentsSilver nanowire PC Film Touch Screen 80 Index matched ITO 2 Glass Touch Screen 150 ReferenceITO PC Film Touch Screen 150 Copper mesh COC Film Touch Screen 10 Copper mesh PET Film Touch Screen 10 Hybrid Copper Mesh PET Film Touch Screen 10 Low Reflectance typeCarbon Nanotube PET Film 1 layer non-patterned 105
166Carbon NanoBud® 2 resistances
Kodak PEDOT PET Film 2 layer non-patterned 150
Optical Test Configuration
Page 9
Motheye
Touch SensorGlass
1.38%
4.75%
8824.00475.0
RTR
8824.09394.08824.00475.01 RTTTA
RAT 1
• A is the touch sensor absorption.• R is the touch sensor reflectance• TT is the total sample transmittance
(measured)• RT is the total sample reflectance
(measured)
PEDOT Optical Test Configuration
Page 10
Motheye
Touch SensorGlass
Touch SensorOptical Interface
A1
R1
A2
R2
4.75%
1.38%
TTAARTR
GG
19525.019525.0
0475.0221
G
GG
ATT
TTAARTA
19525.0
19525.019525.00475.01 221
Test Data Summary
Page 11
00.20.40.60.8
11.21.41.61.8
Silver Nano Wire
PC 80Ω
IM ITO --
Glass 150Ω
ITO --
PC 150Ω
Copper Mesh
-COC 10Ω
Copper Mesh
-PET 10Ω
Hybrid Copper Mesh PET 10Ω
Carbon Nano Tube PET
105Ω
Carbon Nano Tube PET
166Ω
PEDOT --
PET 150Ω
% R
eflec
tanc
e
Reflectance R%
0123456789
Silver Nano Wire
PC 80Ω
IM ITO --
Glass 150Ω
ITO --
PC 150Ω
Copper Mesh
-COC 10Ω
Copper Mesh
-PET 10Ω
Hybrid Copper Mesh PET 10Ω
Carbon Nano Tube PET
105Ω
Carbon Nano Tube PET
166Ω
PEDOT --
PET 150Ω
% A
bsor
ption
Absorption A%
889092949698
100
Silver Nano Wire
PC 80Ω
IM ITO --
Glass 150Ω
ITO --
PC 150Ω
Copper Mesh
-COC 10Ω
Copper Mesh
-PET 10Ω
Hybrid Copper Mesh PET 10Ω
Carbon Nano Tube PET
105Ω
Carbon Nano Tube PET
166Ω
PEDOT --
PET 150Ω
% T
rans
mis
sion
Transmission T%
00.20.40.60.8
11.21.41.6
Silver Nano Wire
PC 80Ω
IM ITO --
Glass 150Ω
ITO --
PC 150Ω
Copper Mesh
-COC 10Ω
Copper Mesh
-PET 10Ω
Hybrid Copper Mesh PET 10Ω
Carbon Nano Tube PET
105Ω
Carbon Nano Tube PET
166Ω
PEDOT --
PET 150Ω
% H
aze
Haze%
Conclusion
Page 12
ITO PEDOT Carbon Nanotube
Hybrid Copper Mesh
ReflectanceLowest reflectance Low reflectance Low reflectance
TransmissionStill has the best transmission
Shows potential for higher transmission
Second best transmission
HazeLowest haze Low haze
Resistivity
Shows potential for lower resistivities
Lowest Ω/□
Will be clear winner for large displays
CommentNeeds further attention in the automotive space
Best for 3D forming Smallest edge tracking with integrated tail
Page 13
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