Strictly Private and Confidential

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

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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

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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

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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

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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

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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

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