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3M Touch Systems
2011 PCT Technical Training
3M Touch Systems
Product Handling
 Never remove the touch screen from its package by gripping and pulling the flat
cable. This may break the cable.
 Handle the product with gloves to avoid leaving fingerprints or smudges. The
transparency of the touch screen is critical.
 Once removed from the original package, touch screens are not to be stacked. The
edges may cause scratching.
 Do not place heavy objects on the touch screen.
 Prevent assembly tools from coming into contact with the touch screen.
 Whenever possible, use plastic tools. Do not apply undue stress to the cable area
(this is the most fragile section).
 The rear (PET) surface may be cleaned by blowing any contaminants with a filtered
de-ionized air source. NEVER use isopropyl alcohol to clean the rear surface.
 The front surface (cover lens) may be cleaned with a soft, lint-free cloth dampened
with isopropyl alcohol. Ensure that there are no contaminants in the cloth.
 Prevent any liquids from coming into contact with the edges of the touch screen.
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© 3M 2007. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Materials & Tools Required
 Safety glasses
 Flat-blade screwdriver with insulated handle
 Electrical tape (or black acetate tape)
 Phillips head screwdriver
 Clean soft cloth and glass cleaner for the
display and sensor
 Soldering iron
 Ring lugs or crimps
 Wire stripper
 Kapton® tape
 Razor knife or single edge razor blade
 Center punch
 Clean, anti-static pad
 Power drill
 Gloves
 Compressed air (optional)
 Cable tie-wraps
 Lead-free solder & iron (RoHS compliant)
 Dremel® tool or nibbler
 Bezel Sealing tape – Test for suitability in
your system
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 Mounting tape -- closed cell acrylic foam
3M VHB 5952 and 5962 (double sided
adhesive), total thickness .107”
© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Touch Screen Construction
 Construction

Non-active cover glass

Patterned ITO rows and columns on PET

Tail connection to each row and column
Cover glass
Rows
Columns
Cover PET
 Driven rows and sensing columns

Allows for sensing at each node

Enables multi-touch performance

Inherently linear by design/construction
Sensing Node
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© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Touch Screen Tails
 Type of Tail – Zero Insertion Force (ZIF)
 Many tails – designs can have 3 – 6 tails
 Tail Construction

Flat Flex Circuit (FFC)

Gold Pins – always on top away from controller board

Stiffener – located on back side opposite of gold pins
 Tail can be folded and creased 1 time in many locations
 Tails should be taped down to prevent possible damage
 Refer to each touch screen marketing drawing for number
of tails, locations, and specific size and mechanical
constraints
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© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Inserting Touch Screen Tails into Connectors
 Open both clips on ZIF connector
 Insert tail so the gold pins are completely in the connector
 Close both clips on connector
 Verify no gold showing along connector edge for proper insertion alignment
Gold side of
connector
should face up
as you insert the
tail
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© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Touch Screen Controller Board
 Each Touch Screen size may have a different
controller board. Consult with Application Engineer
to receive drawings and part numbers.
 Connectors:

3 – 6 ZIF connectors for Touch Screen Tails

1 Power connector

1 Serial connector

1 USB connector
 4 mounting holes located in each corner of the
controller board
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© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Power Connector
 Power Connector – Molex 22-05-3031
 Mating Connector – Molex 22-01-2037

Pins – Molex 08-50-0114
 Pin 1 Not used
 Pin 2 Ground +- 0v
 Pin 3 +12 volts

Typical current supplied: 440mA ± 10% in normal mode

Maximum voltage drop allowed: 50 mV

Peak to peak noise: 100 mV

Voltage regulation: ± 2%
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© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Serial Connector
 Serial Connector – Molex 51004-0810
 Mating Connector – Molex 51004-0800

Pins Molex 50011-8100
 Connector & Cable Pin Out in below table
 3MTS available cable - P/N 7319630
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© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
USB Connector
 USB Connector – Molex 53015-0510
 Mating Connector – Molex 51004-0500

Pins Molex 50011-8100
 Connector & Cable Pin Out in below table
 3MTS available cable - P/N 7319420
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© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Product Inspection – Size and Types (interim)
 Viewing Area Anomalies
All Measurements Are In
Inches
 All diameters refer to the smallest circle
that will totally contain the anomaly.
 A maximum of 5 anomalies within
specification are allowed per touch
screen.
Opaque
Anomaly
 Artifacts measuring less than 0.005
inches are not counted as anomalies.
Translucent
Anomaly
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© 3M 2007. All Rights Reserved
3M CONFIDENTIAL
Circular
0.040
Linear
0.125 X 0.010
Circular
0.070
Linear
.5 X 0.010
3M Touch Systems
Product Inspection – Measurement Tool (interim)
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© 3M 2007. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Product Inspection (interim)
 Flat LCD in the “ON” position
Brightness (300 - 600 cd/m2)
 Color Temperature (white)

–
–
6500 Deg K
9300 Deg K
x: 0.313+/-0.015y: 0.319+/-0.015
x: 0.280+/-0.015y: 0.290+/-0.015
 0.06” (1.5 mm) Gap between touch panel and display
 Operator Inspection Distance -18” (45 cm) from face of touch screen
 Vertical Transmission Inspection
 Colors Program (provided by 3M) – red, green, blue and white
 Display Inspection one color program cycle time
 Measure all anomalies using a CTKII overlay (Figure 1 – Page 9) while the
touch panel is on the display and while running the “Colors” program
 Use one of the following patterns to aid the eye.
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© 3M 2007. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Integration – Gaskets & Spacing off LCD
 Spacing between LCD frame and touch screen .107”
 Kapton Tape – Permacel P-221 Polyimide Film
 Recommended Gaskets – Total spacing .107”

VHB 4611 (.045”) + VHB 5962 (.062”) = .107” total

VHB 4611 (.045”) + VHB 4956 (.062”) = .107” total

VHB 5952 (.045”) + VHB 5962 (.062”) = .107” Total
•
3M Touch Part # 98-0003-3651-5, complete stackup in roll form
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© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Integration - taping
 Taping the LCD


Layer of Kapton tape on LCD frame – optional for ease
of serviceability
Layer of VHB - .107” thick, to attach Touch screen to
LCD frame (3M Touch Part # 98-0003-3651-5)
 Align tape with inside edge of LCD frame and Leave
air gap (1mm – 2mm) in each corner to allow for
ventilation
 Remove top release liner of VHB only in the 4
corners about 1” in length – this creates a pull tab
for the release liner
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© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Integration – Placement & Aligning the touch screen to LCD
 Carefully Remove the release liner from
the rear of the touch screen
 Align 1 corner of the viewing area of the
touch screen to the viewing area of the
LCD
 Place that corner of the touch screen
down onto the VHB
 Align the opposite corner of the touch
screen in the same manor and place onto
the VHB (squaring the touch screen).
 Pull the release liner tabs gently to
remove each liner on all 4 sides
 Rub finger along each side to ensure
complete wetting of the adhesive on the
VHB fully securing the touch screen
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© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Integration – Routing and Taping tails
 Tails vary in # of connections, width, and
construction. Consult touch screen
marketing drawing for detail design
constraints.
 The sensor tail is designed to be flexible,
and it may be creased once in a single
direction, in multiple locations along the
tail and then secured in position with a
light adhesive (Kapton) tape.
 Avoid hard angular creases (45°) within
1/2” of tail bond, connector, or
connection areas of the tail.
 Apply tape or other insulating material to
sharp edges to protect the tail. Route the
cable away from sharp edges whenever
possible.
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© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
Testing – Software Diagnostic Utility (SDU)
 Reference Generic SCT/PCT Test Procedure
 Video Alignment
 Tools - Multitouch

Full Screen Multi Draw

Multi Draw

Graph

Firmware Loader
•
Not provided to customers at this time
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© 3M 2009. All Rights Reserved
3M CONFIDENTIAL
3M Touch Systems
MT7 SDU Review – Video Alignment
Allows adjustment of touch accuracy by aligning video coordinates to touch coordinates
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3M Touch Systems
MT7 SDU Review – Video Alignment
1st Screen with target in Lower Left
2nd Screen with target in Upper Right
2-point calibration
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3M Touch Systems
SDU – Multitouch – Graph
 Raw Mode 3D View

Good to evaluate open row or column

Looking for signals on all columns & rows

Bad row or column will have no signal
 Raw Mode 2D View



Looking for Yellow, Orange, Red, or Green
colors on all Row & Columns
Defective Row or Column generally shows
up as Blue
You can identify the exact row/column
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3M CONFIDENTIAL
3M Touch Systems
SDU – Multitouch – Graph
 Example of Raw Mode Bad Touch Screens

Missing Rows or Columns

3D Graph View

2D Graph View
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3M CONFIDENTIAL
3M Touch Systems
SDU – Multitouch – Full Screen Multi Draw
 Multiple finger draw – should be smooth and continuous
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3M CONFIDENTIAL
3M Touch Systems
Questions
?
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3M CONFIDENTIAL