1. 2011 PCT Technical Training

2. 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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3. 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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4. Touch Screen Construction
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5. 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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6. 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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7. 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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8. Power Connector Power Connector – Molex 22-05-3031
Mating Connector – Molex
Pins – Molex
Pin 1 Not used
Pin 2 Ground +- 0v
Pin 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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9. Serial Connector Serial Connector – Molex 51004-0810
Mating Connector – Molex
Pins Molex
Connector & Cable Pin Out in below table
3MTS available cable - P/N
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10. USB Connector USB Connector – Molex 53015-0510
Mating Connector – Molex
Pins Molex
Connector & Cable Pin Out in below table
3MTS available cable - P/N
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11. 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 inches are not counted as anomalies.
All Measurements Are In Inches
Opaque Anomaly
Circular
0.040
Linear
0.125 X 0.010
Translucent Anomaly
0.070
.5 X 0.010
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12. Product Inspection – Measurement Tool (interim)
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13. Product Inspection (interim)
Flat LCD in the “ON” position
Brightness ( cd/m2)
Color Temperature (white)
6500 Deg K x: / y: /-0.015
9300 Deg K x: / y: /-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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14. 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 # , complete stackup in roll form
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15. Integration - taping Taping the LCD
Layer of Kapton tape on LCD frame – optional for ease of serviceability
Layer of VHB ” thick, to attach Touch screen to LCD frame (3M Touch Part # )
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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16. 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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17. 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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18. 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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19. MT7 SDU Review – Video Alignment
Allows adjustment of touch accuracy by aligning video coordinates to touch coordinates

20. MT7 SDU Review – Video Alignment
1st Screen with target in Lower Left nd Screen with target in Upper Right
2-point calibration

21. 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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22. SDU – Multitouch – Graph
Example of Raw Mode Bad Touch Screens
Missing Rows or Columns
3D Graph View
2D Graph View
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23. SDU – Multitouch – Full Screen Multi Draw
Multiple finger draw – should be smooth and continuous
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24. Questions ?
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