3m touch systems 2011 pct technical training. 2 3m touch systems © 3m 2007. all rights reserved 3m...
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3M Touch Systems
2011 PCT Technical Training
2
3M Touch Systems
© 3M 2007. All Rights Reserved 3M CONFIDENTIAL
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 Touch Systems
Materials & Tools Required
Safety glasses Electrical tape (or black acetate tape) Clean soft cloth and glass cleaner for the
display and sensor Ring lugs or crimps Kapton® tape Clean, anti-static pad Gloves Cable tie-wraps Lead-free solder & iron (RoHS compliant) Bezel Sealing tape – Test for suitability in
your system Mounting tape -- closed cell acrylic foam 3M
VHB 5952 and 5962 (double sided adhesive), total thickness .107”
Flat-blade screwdriver with insulated handle Phillips head screwdriver Soldering iron Razor knife or single edge razor blade Wire stripper Center punch Power drill Compressed air (optional) Dremel® tool or nibbler
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3M Touch Systems
Touch Screen Construction
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Cover glassRowsColumnsCover PET
Sensing Node
Construction Non-active cover glass
Patterned ITO rows and columns on PET
Tail connection to each row and column
Driven rows and sensing columns Allows for sensing at each node
Enables multi-touch performance
Inherently linear by design/construction
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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 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
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Gold side of connector
should face up as you insert the
tail
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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 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 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 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 Touch Systems
© 3M 2007. All Rights Reserved 3M CONFIDENTIAL
Product Inspection – Size and Types (interim)
Viewing Area Anomalies 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.
Artifacts measuring less than 0.005 inches are not counted as anomalies.
All Measurements Are In Inches
Opaque Anomaly
Circular 0.040
Linear 0.125 X 0.010
Translucent Anomaly
Circular 0.070
Linear .5 X 0.010
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3M Touch Systems
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Product Inspection – Measurement Tool (interim)
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3M Touch Systems
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Product Inspection (interim)
Flat LCD in the “ON” position Brightness (300 - 600 cd/m2) Color Temperature (white)
– 6500 Deg K x: 0.313+/-0.015y: 0.319+/-0.015– 9300 Deg K 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 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 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 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 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 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 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
2-point calibration
1st Screen with target in Lower Left 2nd Screen with target in Upper Right
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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 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 Touch Systems
SDU – Multitouch – Full Screen Multi Draw
Multiple finger draw – should be smooth and continuous
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3M Touch Systems
Questions
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?