pacp for wet&glove...comparison of touch panel technologies type of touch technology benefits...

00000-A© 2016 TIANMA NLT Europe GmbH. All rights reserved. www.tianma-nlt.eu

PACP for wet&glove

Karl-Heinz Lambertz

Tianma-NLT Europe

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© 2016 TIANMA NLT Europe GmbH. All rights reserved. www.tianma-nlt.eu

Karl-Heinz Lambertz

Senior Marketing Manager

Located in Germany, Düsseldorf

Responsible for PCAP marketing and applications

Tianma-NLT

TIANMA : 30 years of experience in the Flat Panel Display field

NLT : 30 years experience in TFT and Displays (NEC LCD)

TIANMA NLT Europe : Launched April, 2015 BUT over 20 years of LCD business in Europe

ShanghaiTianma TIANMA NLT EUROPE

Tianma Micro-Electronics

TIANMA NLT …

Shenzhen AVIC

Optoelectronics

… Tianma

Introduction

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Agenda

Touch Panel Market trends

Touch Panel Technologies

PCAP Basics

PCAP advantages and drawbacks

PCAP business model

Wet & Glove Technology

3Summary

3


Touch Panel Market Trend – by Type

4


PCAP Market Trend – by Application

Commercial and Industrial Market, non-consumer

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Touch Panel Technologies

Touch Panel

Resistive

Capacitive

Infrared

ProjectedCapacitive

SurfaceCapacitive

Analog

Digital

Acoustic Wave

Surface AcousticWave

BendingWave

Digitizer

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Glass substrate

Adhesive tape PET film

Touch panel cross-section image

When PET film is pushed by stylus pen or finger, ITO films contact each other.The touch position is determined by measuring the electric resistance between the electrodes.

Stylusspen or Finger

ITO film

FPC

*ITO : Indium Tin Oxide

*PET : Poly Ethylene Terephthalate

Resistive Touch

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Acoustic Wave

Touch position is determined by the soundwaves picked up each transducer.

Infrared

Touch position is determined where thephotoreceptor was hidden.

Infrared lights

Infrared lights

Photoreceptor

Photoreceptor

Sound Transducer

Infrared and Acoustic Wave Touch

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ElectrodeMembrane resistance

(transparent ITO)

Cover Glass

Electrostatic capacity

between finger and

each electrodes.

Touch position is determined by the

intensity of the electric current from

each electrode.


Surface Capacitive Touch

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Controller

Touch position is determined by the

measurement of electrostatic capacity. Electrostatic capacity

between finger and

each electrodes.

Front glass

Sensor grid

Back glass

Ele

ctr

osta

ti

c c

ap

ac

ity


Projected Capacitive Touch

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Comparison of Touch Panel Technologies

Type of Touch Technology Benefits Limitations Actual Market

Resistive Simple structure

Simple Controller IC

Needs calibration

Mainly Single Touch

Optical performance

Still used in smaller diagonals with low BOM

Infrared High transmittance Reliability, Long life Large size (100inch)

Resolution Mainly Single Touch Exclusive IC Sensitive to ambient light

Acoustic Wave Any touch-object High Durability

Exclusive IC Mainly Single Touch

LargeDiagonals

Surface Capacitive High transmittance Good touch performance

Exclusive IC Single Touch

Still used in medium to big sizes

Projected Capacitive High durability

Smooth and swift touch

Multi touch

Mainly finger touch Exclusive IC

Most used in Smart Phones and Tablets

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ProjectedCapacitive

Glass base Film base

Single Glass 2Glass Film/Glass Single Film 2Film

Sensor layer

by ITO and metal wire


Projected Capacitive Touch

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PCAP Basics

A typical LCD-PCAP Sensor-Coverglass assembly

The ITO pattern building a kind of X-Y grid to detect the touch positon

LCDSITO

Optical Bonding Airgap Adhesive

Tape

Sensor Glass

FPC

Cover Glass

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PCAP Touch Detection

PCAP general parameter settings

Gain : Touch panel signal on analog side Detection of events higher than sensor noise level

Threshold : Value level to decide a signal as touch Higher than this level is “Touch”

Touches

Base Noise

Sig

nal str

eng

ht

Touch threshold

Noise

PCAP

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PCAP with gloves and water

Glove Operation

Water Operation

Recognized by PCAP sensor

PCAP

SensitivityThreshold level

In case of thick gloves

• Increase amplification

• Lower Threshold

Lower SNR

Below Threshold

PCAP

SensitivityThreshold level

Water

Water puddle is recognized by PCAP sensor

In case of water puddles

• Decrease amplification

• Increase Threshold

Lower Sensibility

Water

In case of water puddles

• Set threshold to avoid

“wider” touch

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PCAP with gloves and water (2)

Water Condition

PCAP surface Application, Function

mist/condensation No problem

showerIt works Consider reducing the sensitivity

wet, puddlesFalse touch possibleFine again after wiping

Glove Type Application, Function

Nitrile Glove No problem (several layers)

Craftmen GloveIt works Consider increasing the sensitivity

Thick Glove Missing touch possible

Glove Condition

Combination of Water and Glove is challenging

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PCAP advantages

Touch performance Swift and smooth touch experience w/o pressure to the panel

Fast and accurate tracking and scrolling

Multi touch with 10 and more simultaneous touches

Optical performance Optical bonded Glass with 95% transmissivity

No yellowing foils under UV

Excellent sun light readability of the LCD

Mechanical implementation Durable glass front for extreme anti vandal applications

Glass can be flush build on/in the casing (iPad like)

Glass can be printed (black frame and logo)

Glass can be treated according to needs (AG, AR, AFP)

Electrical implementation Wide range of sizes possible (up to 20+”)

Various controller IC makers with diverse features

Good tune-ability for different applications and environments (SNR, EMI)

General Widely used in consumer goods (designer know-how and user experience)

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PCAP business model

PCAP can be put on existing LCD

By 3rd Party

– LCD from supplier X, PCAP from supplier Y, Glass from supplier Z, Assembly by another company

– Tuning and “total responsibility” by ???

By LCD Manufacturer

– Stable and consistent support through product life

– Single supplier source for orders, support, quality, etc.

– From design-in to mass production

– Design, Production and Assembly of PCAP at one party

– Customer Service incl. EOL and product policy

One-stop-shop-solution is the preferred sourcing route

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Tianma-NLT PCAP Options

Cover Glass

Special Glass Decorated GlassNon-Alkali Glass

* AFP: Anti Finger Print* AR: Anti Reflective* AG: Anti Glare

Surface Treatment

Film (AFP, AR, AG+AFP) Coating (AR, AG, AFP)Clear

Bonding

Air Gap Optical Bonding

Sensor Size

6,5“ … 7“ … 8.4” … 9“ … 10,4“ … 10,6“ … 12,1“ … 15“ … 19” …21.5”

NLT is supporting a wide variety of build-up options

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Tianma-NLT PCAP Solution

NLT PCAPSolution

Cover glass option

Tuning software

Controller tuning

Bonding

One-stop-shop serviceLong term support

Size

OS Driver support

Surface option

- Standard- Special

(ex. Wet & Glove)

- Air gap- Optical

- up to 21.5”

- Clear- AFP- AR- AG+AFP

- Standard(Non-Alkali)- Soda Lime

with/without chemical strength

- Dragon Trail

Glove Wet

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WET&GLOVE

One item left to solve …

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Mutual capacitance

Working Principle

Capacitance between two / multiple electrodes is measured

The “Touch” decreases the capacitance between those

Mutual Capacitance Advantages Mutual Capacitance Disadvantages

2 or more unambiguous touch detections 10 and more possible

Complex Sensor and Controller

Good against EMI disturbances High SNR results

Challenging for wet & glove application

Source: Geoff Walker, Fundamentals of Projected Capacitive Touch Technology

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Self Capacitance

Working Principle

Each single electrode is measured individually against Ground

The “Touch” increases the capacitance to Ground

Self Capacitance Advantages Self Capacitance Disadvantages

Long distance field projection Supporting wider gap sensor to finger

Single touch only

Simple measurement against Ground Tolerant to water puddles

Calibration drift

Source: Geoff Walker, Fundamentals of Projected Capacitive Touch Technology

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Combining Mutual- and Self Capacitance

Combination of mutual- and self-capacitance touch

Mutual / Self capacitance Dual detection

Mutual capacitance

Multi touch without Ghost points

Self capacitance

Touch detection with thick glove

Touch detection in wet conditionsAutomatic adjustment

between mutual- and self-capacitance to achieve optimal touch detection

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Wet & Glove Technology

Wet condition

Self-cap : no malfunction detected

Mutual-cap : malfunction detected Mutual-cap : insufficient signal detected

Self-cap : strong signal detected

Glove condition

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PCAP advantages

Touch performance Swift and smooth touch experience w/o pressure to the panel

Fast and accurate tracking and scrolling

Multi touch with 10 and more simultaneous touches

Optical performance Optical bonded Glass with 95% transmissivity

No yellowing foils under UV

Excellent sun light readability of the LCD

Mechanical implementation Durable glass front for extreme anti vandal applications

Glass can be flush build on/in the casing (iPad like)

Glass can be printed (black frame and logo)

Glass can be treated according to needs (AG, AR, AFP)

Electrical implementation Wide range of sizes possible (up to 20+”)

Various controller IC makers with diverse features

Good tune-ability for different applications and environments (SNR, EMI)

General Widely used in consumer goods (designer know-how and user experience)

Wet & Glove capable

Come and see/touch the Demo26


Summary

PCAP

Is the most commonly used touch technology these days

Is used is consumer goods as well as in industrial and medical applications

– Same function and feeling as with your Tablet / Smartphone

Is able to deal with almost all requirements

– Thick glass, EMI environment, wet & glove

LCD+PCAP

Can be assembled to one single unit

Thin and light weight sensor enabling ultra low height build up

One stop shop solution preferable : LCD + PCAP from a single source

– Design, Production, Assembly at Tianma NLT

– Incl. Support and Logistics

Wide variety of build-up options

– Bonding options, Glass options, Tuning, …

– Standard catalogue devices as well as custom solutions

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pacp for wet&glove...comparison of touch panel technologies type of touch technology benefits...

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