8.
Precautions in use
8-1.
Precautions for handling
(1). The polarizer is quite susceptible to scratches. Handle it very carefully. Do not handle it with metallic tweezers
nor press nor rub it.
(2).
Do not contact the display face by nor get it stained.
If the surface is dirty, wipe it
off
lightly with a cotton swab or a piece of soft cloth or chamois which is soaked
with petroleum or benzine. Never use organic solvents including acetone, toluene, ethanol, and isopropyl
alcohol; they would damage the surface.
discoloration.
skin or clothes, wash it
off
immediately by using a soap.
(3).
Do not allow saliva or water to remain on the surface for long; it might cause a local deformation or
(4).
When the LCD has broken and the liquid crystal has come out, never allow it in your mouth. If it sticks to the
8-2.
Installation
(1).
The ICs mounted on the PCB are very susceptible to static electricity.
To
protect them from static electricity
which your body and clothing collect, connect your body to the ground via a resistor of some 1M ohms
so
that
the electricity should discharge. Connect the resistor close to your body in the grounding line and protect
yourself from electric shock hazard.
(2).
Neither bend nor twist the module excessively when installing it. Otherwise the device might break or the
circuits fail.
(3).
Protect the LCD, particularly the surface of polarizer, with a transparent plate (such acrylic or glass plate)
on
the cabinet.
8-3.
Operational precautions
(1).
The ICs would break down if the drive voltage exceeds the limit. Make sure of electrical specifications,
(2).
The response of the display is slow when the ambient temperature is below the lower limit, and the display
particularly the supply voltage.
surface appears dark everywhere when the ambient temperature is above the upper limit. In any case, it does
not mean failure. It operates properly in the normal operating temperature range.
Adjust the drive voltage for the best contrast by installing external variable switch.
module and it might fail.
(3).
The contrast of the liquid crystal display varies with the viewing angle, ambient temperature, and drive voltage.
(4).
If you move the module from a cold storage into the room as during test, moisture would condense on the
(5).
In order to prevent IC latch-up and DC voltage on the LCD Panel, please power on by the following Fig.
A-
12.
8-4.
Storage
(1).
Avoid high temperature and high humidity. The temperature should be
0-35°C
and humidity be under
60%.
(2).
Store the module in a dark place, out of direct sunlight and fluorescent lamp, etc.
(3).
Keep the polarizer away from any external forces.
(4).
Store the module, in the box as it is in delivery or in the same conditions.
A-12
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