Resistive Touch Screen Mounting Guidance

Resistive Touch Screen Mounting Guidance
http://www.dmccoltd.com/english/
DMC Co., Ltd.
Takanawa Sengakuji Ekimae Building 11F
2-18-10Takanawa, Minato-ku, Tokyo 108-0074
Phone: +81-3-6721-6736 Fax: +81-3-6721-6732
Resistive Touch Screen Mounting Guidance
Sept 8, 2015
Sales Promotion Dept
DocNo.DER-M0010F
*Refer to the suggested structure and mounting precautions in this document at mounting the
touch screens. Appropriate structure differs according to touch screen size, LCD, chassis design,
usage environment and so on. Please conduct the evaluation with actual products at the trial stage,
and confirm that your structure is appropriate prior to fixing the structure design.
① Suggested Touch Screen Mounting Structure for Film/Glass Type
Bezel Opening
Insulation Area
Viewing Area
Front Bezel
L3>1.0mm
L1a
Active Area
L1b>2.0mm
Cushion (Gasket)
ITO Layer
L2>0.5mm
ITO Film
2.0mm
Input Inhibited Area
Adhesive
Touch Screen
ITO Glass
Spacer Dot
Adhesive
Display
Fig.1
1
http://www.dmccoltd.com/english/
DMC Co., Ltd.
Takanawa Sengakuji Ekimae Building 11F
2-18-10Takanawa, Minato-ku, Tokyo 108-0074
Phone: +81-3-6721-6736 Fax: +81-3-6721-6732
② Mounting Precautions
Bezel Edge (Fig.1&2)
Bezel edge is suggested to be positioned in the area
between active area and viewing area (L1a). If the bezel
edge overlaps the active area, it may cause a false input
when the bezel is pressed.
Bezel
Input Inhibited Aera (refer to the section d.) is structurally weak
against pressure. If the distance between active area and viewing
area (L1a) is 2.0mm or longer, the bezel edge (l1b) is
recommended to be longer than 2.0mm so that the Input Inhibited
Area will be protected by the bezel.
b.
Bezel
Top Electrode
L1a
Area between Active Area and Viewing Area (Fig.1&3)
If the area between the active area and viewing area (L1a) is
pressed, false input may be caused. Do not touch this area.
(Fig.3)
d.
Fig.2
Gap between Bezel and Touch Screen (Fig.1&3)
A gap between bottom of the bezel and the touch screen
surface (L2) needs to be longer than 0.5mm. Otherwise, the
bezel edge may cause false input when the bezel is pressed.
c.
2.0mm
L1b
L2>0.5mm
a.
Active Area
Viewing Area
Insulation Area
Fig.3
Input Inhibited Area (Fig.1&4)
Bezel
2.0mm from the edge of the insulation area toward the
viewing area (Input Inhibited Area) is structurally weak
against pressure., epsecially by a pen. If this area is touched
by a pen, the film may get stretcehd and the touch scree
gets broken, Do not touch on this area directly.
Input Inhibited Area
Insulation Area
e.
2.0mm
Cushion (Gasket) (Fig1&5)
If a cushion is used between the bezel and the touch screen
surface, the cushion must be free enough to absorb the
expansion and contraction difference between the bezel and
the touch screen surface. If the cushion is squashed too hard,
the expansion and contraction difference may cause the
distortion to the touch screen surface.
The cushion must be positioned more than 1.0mm (L3)
outward from an inside of the insulation area. (Refer to
Fig.5 & the drawing)
2
Bezel
Cushion
Top Electrode
Insulation Area
L3
More than 1.0mm
Fig.5
Fig.4
http://www.dmccoltd.com/english/
DMC Co., Ltd.
Takanawa Sengakuji Ekimae Building 11F
2-18-10Takanawa, Minato-ku, Tokyo 108-0074
Phone: +81-3-6721-6736 Fax: +81-3-6721-6732
f.
Tolerance (Fig.6)
There is a tolerance of 0.2 to 0.3mm for the dimensions of
the touch screen and the FPC connector cable. A gap must
be made to absorb the tolerance in the case and the
connector.
g.
0.2~0.3mm Case
Fig.6
FPC Connector Cable (Fig.7)
The FPC connector cable must not be forcibly stressed or
bent too hard to avoid the conduction in the insulated area
and wire breaking.
FPC Connector Cable
Fig.7
h.
Mounting Touch Screen (Fig.8)
Touch screen must be held from the bottom, such as the
structure gluing the touch screen onto the display. If the
touch screen is glued to the bezel, the adhesion between the
top and bottom electrode is stressed and may come off.
Bezel
Display
i.
Fig.8
Air Vent (Fig.9)
Some touch screens have the air vent to equalize the inside
air pressure to the outside one. The air vent must not be
covered, and liquid contact must be avoided as the liquid
may be absorbed if the liquid is accumulated near the air
vent. The top electrode film must not be swelled by the air
pressure from inside of the case.
Fig.9
3
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