LM057QCTT03 View Datasheet(PDF) - Sharp Electronics
Part Name
Description
MFG CO.
'LM057QCTT03' PDF : 25 Pages View PDF
@HARP
r
SPEC No.
LC99908
I
MODEL No.
LM057QCTT03
I
PAGE
4
in contact with lower electrode and may cause a electrical leakage.
b) As the purpose of the inactive area is to keep the flatness of the upper electrode ftirn in the touch panel
structuie. hard push by pen or by system chassis may cause a functi&al error.
Designing print circuit
1. There is a contact resistance between upper and lower electrodes of the touch panel. It is recommended
to set the impedance of detecting circuit high enough. Low impedance detecting circuit may cause a
functional error.
2. Contact of the upper and lower electrode generates a contact resistance. Access by pen or finger to the
touch panel should be started after the contact resistance becomes stable. Otherwise, it may cause
a functional error.
3. Touch panel picks up a noise easily. It is recommended to earth or do other noise protections. Otherwise,
it may cause a functional error.
Designing system chassis
1. Retain the air gap between upper electrode film and front chassis.
a) Retain minimum of 0.3mm air gap above the inactive area so that the front chassis does not make a
pressure on upper electrode film. If there is any pressure on it, it may cause a functional error due to
the deformation of the upper electrode film.
b) Flexible material such as rubber is recommended as cushioning materials. It should be placed outside of
visible area. If it is placed onto inactive area, it may cause a functional error due to deformation of
the upper electrode film.
2. Assemble design
a) Do not glue nor tape system front chassis to the surface of touch panel(upper electrode fam) as it may
lead to peeling off of the upper electrode film
b) Make sure not to swell the upper electrode film by atmospheric pressure difference between inside and
outside of the system. If it is swelled, it may cause a deterioration of durability of the touch panel and
may cause a functional error.
c) Prevent vapor condensation to the touch panel. Do not expose the touch panel to high humidity
Atmosphere, vaporous air, or to any liquid such as water. It may cause a leakage inside the touch panel
structure:
Upper electrode film and lower electrode glass are fied by adhesive, and there is a ventilation hole
between film and glass. Liquid penetrate into touch panel easily due to this structure. Design the system
carefully so that liquid will not penetrate into touch panel.
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