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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
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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.
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CONFIDENTIAL
Tungsten Carbide lipsStainless steel lips
Stainless steel bodyMachine stage
Substrate
Single substrate process
Over view of Slot Die
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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
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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
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CONFIDENTIAL
Dexerials
How to use LOCA in the production
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Frameor
Black Matrix
LOCA
Short tact time
Non over flow of LOCA
No bubble & No streak
Requirement of LOCA coat
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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
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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
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Tungsten CarbideLong Nose Lip
Impossible Possible
Progressed coating method by Slot Die
Conventional structure Progressed structureThis invention is patent pending.
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Coating width
Conventional structure Progressed structure
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LOCA =5,000-7,000CPS HybridTarget wet THK=100um
Experiments of Coating
Step1: Initial purgeStep2: Coating (Filling)
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CONFIDENTIALLOCA =5,000-7,000CPS Hybrid, Target wet THK=100um, Coating velocity = 15mm/sec
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CONFIDENTIALLOCA =5,000-7,000CPS Hybrid, Target wet THK=100um, Coating velocity = 30mm/sec
Without the frame.
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CONFIDENTIALLOCA =5,000-7,000CPS Hybrid, Target wet THK=100um, Coating velocity = 80mm/sec
Copyright © 2011 MMC RYOTEC CORPORATION ALL RIGHTS RESERVED
CONFIDENTIALLOCA =5,000-7,000CPS Hybrid, Target wet THK=100um, Coating velocity = 80mm/sec
With Double Frame
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T1
T2
T3
T=T1=T2=T2
Tungsten Carbide Long Nose Lip
L
3T ≦ L ≦ 18TT=0.2mm-0.5mm
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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
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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
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15mm/sec Flow direction profile
-20
0
20
40
60
80
100
120
140
160
0 20 40 60
Flow direcion[mm]
THK[
μm]
20mm/sec Flow direction profile
-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
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40mm/sec Flow direction profile
-20
0
20
40
60
80
100
120
140
160
0 20 40 60
Flow direction[mm]
THK[
μm]
30mm/sec Flow direction profile
-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=20.88 um Bump height=18.75um
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80mm/sec Flow direction profile
-20
0
20
40
60
80
100
120
140
160
0 20 40 60
Flow direction[mm]
THK[
μm]
60mm/sec Flow direction profile
-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=19.46 um Bump height=17.16um BEST
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20mm/sec WEB direction profile
-200
2040
6080
100120
140160
0 20 40 60 80 100
WEB direction[mm]
THK[μ
m]
15mm/sec WEB direction profile
-20
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
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=13.94 um Bump height=11.87um
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CONFIDENTIAL
40mm/sec WEB direction profile
-20
0
20
40
60
80
100
120
140
160
0 20 40 60 80 100
WEB direction[mm]
THK[
μm]
30mm/sec WEB direction profile
-20
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
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=10.53 um Bump height=11.95um
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CONFIDENTIAL
80mm/sec WEB direction profile
-20
0
20
40
60
80
100
120
140
160
0 20 40 60 80 100
WEB direction[mm]
THK[
μm]
60mm/sec WEB direction profile
-20
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
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=10.75 um Bump height=10.23um BEST
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CONFIDENTIALPrevious our study of bump reduction
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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
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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.
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