CONFIDENTIAL Optimization of LOCA Gap Fill Process by High … · 2018-10-08 · Lip gap=0.5mm,...

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CONFIDENTIAL

Optimization of LOCA Gap Fill Process by High Precision Slot Die

Naoki S. RikitaTechnical DirectorR&D Marketing Division, MMC RYOTEC Corporation7F. KFC BLDG 1-6-1, YOKOAMI, SUMIDA-KU, TOKYO, 1300015 JAPAN*T. Kanayama, *K. Takahashi, *A. Hayashi, *T. Ito*Gifu Plant, Wear Resistant Tool Dev, MMC RYOTECemail: [email protected]: +81-3-5819-5264Fax: +81-3-5819-5259 RDM201602


CONFIDENTIAL

Adhesive = LOCALiquid Optical Clear Adhesive (LOCA) is well known

material for touch panel display and flexible sensors. Since LOCA was used for touch panel display, many non-uniformity issues and fill process issues are reported. High precision Slot Die solved these issues, instead of dispenser nozzle. This paper explain new coating technique by high precision Slot Die.


CONFIDENTIAL

Tungsten Carbide lipsStainless steel lips

Stainless steel bodyMachine stage

Substrate

Single substrate process

Over view of Slot Die


CONFIDENTIAL

Resistive typePET

OCA 50umITO Film

ITO FilmOCA 25 - 50um

PC/Glass

LCD

Cover (Glass/PC)OCA over 150um

Touch PanelOCA over 150um

LCD

Capacitive type

Three Bond HP

Cover glass

Touch panel

Display

•OCA tape is good material on less than 7 inch flat panel.•On over 7 inch flat panel, the rework and the tact time, over flow are big issues.

Device structure


CONFIDENTIAL

CoverTouch sensor

LOCA over 200umLCM

Cover

Touch sensorLOCA over 200um

OLED

Cover

Touch sensor

LOCA over 200um

LCM

CoverLOCA 100-175um

Touch sensor

LOCA over 200um

LCM

Glass

GG type OGS type on-cell type in-cell type

Cover

OCATouch sensor

LOCA over 200umLCM

Film

Touch sensor

【G1F type】The location of L-OCA①「Cover Glass」+「Touch sensor」②「Touch sensor」+「LCM」

with SUS framewithout SUS frame less

LCMLOCA

CoverLOCA

LOCALCM

Device structures


CONFIDENTIAL

Dexerials

How to use LOCA in the production


CONFIDENTIAL

Frameor

Black Matrix

LOCA

Short tact time

Non over flow of LOCA

No bubble & No streak

Requirement of LOCA coat


CONFIDENTIAL

Issues1. Long tact time by nozzle painting2. Over flow of LOCA Excess coat of LOCA3. Air bubble

Conventional dispense nozzle process for L-OCA

Over flow of LOCA


CONFIDENTIAL

L-OCA requirement

3,000 - 50,000cps

Coating THK: 7”=100 - 200um >>> 42”＝800um

SD

BM or Frame

Cover Glass

1mm - 3.5mmBonding Process

Slot Die process for L-OCA

L-OCA

Progress1. Short tact time by Slot Die2. Non over flow of LOCA Proper coat of LOCA3. No air bubble


CONFIDENTIAL

Tungsten CarbideLong Nose Lip

Impossible Possible

Progressed coating method by Slot Die

Conventional structure Progressed structureThis invention is patent pending.


CONFIDENTIAL

Coating width

Conventional structure Progressed structure


CONFIDENTIAL

LOCA =5,000-7,000CPS HybridTarget wet THK=100um

Experiments of Coating

Step1: Initial purgeStep2: Coating (Filling)


CONFIDENTIALLOCA =5,000-7,000CPS Hybrid, Target wet THK=100um, Coating velocity = 15mm/sec



Without the frame.





With Double Frame


CONFIDENTIAL

T1

T2

T3

T=T1=T2=T2

Tungsten Carbide Long Nose Lip

L

3T ≦ L ≦ 18TT=0.2mm-0.5mm


CONFIDENTIAL

Comparison data by Long Nose Lip,Stainless Steel vs Tungsten Carbide

Same dimension and same structure of Long Nose LipTarget wet THK=100um

Non homogeneous

Homogeneous

Lack rigidity Enough rigidity LOCA =5,000-7,000CPS HybridTarget wet THK=100umCoating velocity = 0.9m/minute


CONFIDENTIALL ≦ 18T

Bow shapeBow shape

Flat shape

Tungsten Carbide Long Nose Lip

L=5.5mmTarget wet THK=100um, Coating gap=125umLip gap=0.5mmCoating area = 90.8mm×52.4mmLOCA =5,000-7,000CPS Hybrid

L=5.4mmT=0.3mm

L=6.0mmT=0.3mm

L=6.6mmT=0.3mm


CONFIDENTIAL

15mm/sec Flow direction profile

-20

0

20

40

60

80

100

120

140

160

0 20 40 60

Flow direcion[mm]

THK[

μm]


-20

0

20

40

60

80

100

120

140

160

0 20 40 60

Flow direction[mm]

THK[

μm]

Data comparison on Flow direction by coating velocity

Bump

L=5.5mm, Target wet THK=100um, Coating gap=125umLip gap=0.5mm, Coating area = 90.8mm×52.4mmLOCA =5,000-7,000CPS Hybrid

Bump height=19.53 um Bump height=18.49um


CONFIDENTIAL


-20

0

20

40

60

80

100

120

140

160

0 20 40 60

Flow direction[mm]

THK[

μm]


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0

20

40

60

80

100

120

140

160

0 20 40 60

Flow direction[mm]

THK[

μm]


Bump




CONFIDENTIAL


-20

0

20

40

60

80

100

120

140

160

0 20 40 60

Flow direction[mm]

THK[

μm]


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0

20

40

60

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100

120

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160

0 20 40 60

Flow direction[mm]

THK[

μm]


Bump


Bump height=19.46 um Bump height=17.16um BEST


CONFIDENTIAL

20mm/sec WEB direction profile

-200

2040

6080

100120

140160

0 20 40 60 80 100

WEB direction[mm]

THK[μ

m]


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0

20

40

60

80

100

120

140

160

0 20 40 60 80 100

WEB direction[mm]

THK[

μm]

Data comparison on WEB direction by coating velocity

Small bump




CONFIDENTIAL


-20

0

20

40

60

80

100

120

140

160

0 20 40 60 80 100

WEB direction[mm]

THK[

μm]


-20

0

20

40

60

80

100

120

140

160

0 20 40 60 80 100

WEB direction[mm]

THK[

μm]


Small bump




CONFIDENTIAL


-20

0

20

40

60

80

100

120

140

160

0 20 40 60 80 100

WEB direction[mm]

THK[

μm]


-20

0

20

40

60

80

100

120

140

160

0 20 40 60 80 100

WEB direction[mm]

THK[

μm]


Small bump


Bump height=10.75 um Bump height=10.23um BEST


CONFIDENTIALPrevious our study of bump reduction


CONFIDENTIAL

Trend of coating gap vs Ski Jump(Bump), Coating widthCoating width: 246mm Target Wet THK: 100um(ＷＥＴ)

The inverse proportionSki Jump(Bump) vs Coating width

10mm/sec 30mm/sec

Previous our study of bump reduction


CONFIDENTIALConclusion

1. Tungsten Carbide Long Nose is useful to LOCA process for Sensor and Touch panel.

2. Stainless Steel Long Nose is not enough rigidity for this process.

3. Tungsten Carbide Long Nose outperformed to Stainless steel Long Nose.

4. It seems that higher coating velocity is suitable for this process.

5. Tungsten Carbide Long Nose Length must be 3T ≦ L ≦ 18T & T=0.2mm-0.5mm in this study.

6. In previous our study explained How to reduce the bump.

Date post:	28-Jul-2020
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CONFIDENTIAL Optimization of LOCA Gap Fill Process by High … · 2018-10-08 · Lip gap=0.5mm,...

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