FTS Self Self-Capacitive Capacitive Touch Panel Design Rules ( only for under 4.3” panel)
single Point + gesture(Film/Glass)
Focaltech‐Systems Version:V1.0 Henry?Liu Sep. 2012
Item
?TP stack up ?Panel pattern layout rule ? Button area design rule ?Dummy ITO design rule ?Panel electrical design rule
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TP?Stack?up
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Panel?pattern?layout?rule?(1)
?The blue line is ITO pattern. ?The red line is sensor outline. ?The pink line is Lens VA and outline.
Note:
The ITO pattern is the vertical-triangular design and all traces are ITO traces.
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Panel?pattern?layout?rule?(2)
c a
Parameters:
a=0.8~2mm,typical 2mm,a is the distance between Lens VA and sensor AA in X-direct X direct. c= 0.4~0.8mm,typical 0.6mm,c is the distance between Lens VA and sensor AA in Y-direct.
Sensor AA
Lens VA
c a
Lens VA Sensor AA
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Panel?pattern?layout?rule?(3)
b
Pitch e d
Parameters:
n
e
Pitch: typical 7mm 7mm,6.5~7.5mm 6 5~7 5mm is suitable. b=0.1~0.3mm,typical 0.3mm. d=0.1~0.3mm,d is the smaller, the better (d is the tip width of triangle). e=0.3mm,e is the gap of ITO trace. n=(pitch-3d-6e)/3,n is the width of g one triangle.
Note:
One unit includes three triangles.
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Panel?pattern?layout?rule?(4)
Gw Lw Gt Ge
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Notes:
Lw is the width of ITO trace. Gw: Guard ring width ≥ 0.1mm. Ge≥ 0.1mm,typical 0.2mm,Ge is separation width guard ring and trace. Gt ≥0.4mm,(Guard ring edge to sensor glass outline).
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Button?area?design?rule?(1)
Three?buttons?design?rule?
B C D
Parameters:
X ≥ 4mm 4mm,Y Y ≥ 4mm 4mm,typical typical 5mm 5mm, X is the length of ITO button,Y is the width of ITO button. A=B=0.3mm,A and B are the width of ITO block. C=0.3mm,C is the gap of ITO block in X-direct. D=0.6mm,D is the gap of ITO block in Y-direct.
Y
A X
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Button?area?design?rule?(2)
Four?buttons?design?rule?
Parameters:
X ≥ 4mm,Y ≥ 4mm, typical 5mm, X is the length of ITO button, Y is the width of ITO button. A=0.3mm,A is the width of small ITO block. B=3*A=0.9mm,B is the width of big ITO block. C=B/2=0.45mm. D=0.3mm,D is the gap of ITO block in X-direct. E=0.6mm,D is the gap of ITO block in Y-direct.
E
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Dummy?ITO?design?rule
a Pitch Dw
Note:
If ITO process space less than 0.3mm,need use dummy ITO to fill the gap of sensor ITO.
Dw a
Parameters:
DL=pitch/4, DL is the length of dummy ITO. DW=0.1~0.3mm, DW is the width of dummy ITO. a=0.03~0.1mm,a is gap of ITO process space.
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DL
Panel?electrical?design?rule
? ITO cell?+?trace?resistance
– S<20KΩ
? ? ? ?
Sensor?channel?to?ground?capacitance：<80pF Backside?ITO?shielding:?no?need Guard?ring?resistance:?<200Ω Cover?lens?thickness
– Glass:?0.5~2.0mm?(k:6~9) – PMMA:?0.3~1.0mm?(k:3~5) – PET:?0.2~1mm?( (k:2~3) ) ? Air?Gap?of?CPTM?and LCD – Air gap?: more?than?0.3mm?
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