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Handling LCD Modules

Our Liquid Crystal Modules have been assembled and calibrated before delivery. For best results, please observe the following handling precautions:

1)  Do not subject the module to excessive shocks by dropping it.
2)  Do not modify the tabs of the metal bracket or make any modification to it.
3)  Do not modify the printed circuit board.
4)  Limit the soldering on the printed circuit board to the I / O terminals.
5)  Do not touch the rubber connector, or modify its location.

Static Electricity Precautions
Most of our liquid crystal modules use CMOS LSI driver chips. Precautions for static electricity are taken throughout the manufacturing process all the way through shipping. When using the modules, take care to prevent static electricity, as is usually done when using any CMOS IC's.

1. Always ground  yourself when handing Liquid Crystal Modules.

Always ground yourself while working with liquid crystal modules from the time they are taken out of their  anti-static bag  until they are assembled into a product that is at the same ground potential. When it is necessary to transport a module, always place it back in its conductive bag or in another electrically conductive container. Also  avoid wearing clothes made of chemical based fibers such as nylon. Clothes made of cotton or treated fibers are recommended.

2. Use a zero leakage current soldering iron when soldering to a liquid crystal module.
The soldering iron used for soldering the I/O terminals of the module should be insulated at the tip, or grounded at the iron tip.

3. Grounded electrical tools are always required for assembly.

All electrical tools required to assemble a module, especially the driver chips, should be grounded to avoid the noise spikes generated when a motor is rotated.

4. Make sure the your workbench potential is equal to ground.

When your workbench is grounded with a steel plate, there is a possibility of damaging the module, or in rare cases, an electric shock can be generated because the bench impedance is too low. We therefore recommended that you use an electrically conductive or rubber mat 

5. Peel the release sheet (protective film) off the module very slowly.

The displays on most modules are covered with a protective plastic film to protect the front polarizer surface during manufacturing and shipping. Peeling the protective sheet off abruptly may cause static electricity to be generated . This can be easily prevented by peeling the tape off slowly.

6. Pay attention to the humidity of the work shop.

Ambient humidity in the workspace should not exceed 50~60%RH.

Cautions for Soldering to a module

The following precautions should be taken when soldering a module:
1) Solder should be applied only to the I / O terminals.
2) Use a soldering iron with zero leakage current.
3) soldering iron temperature should be 280oC + 10oC at the tip.
4) Soldering time should be no longer than  3-4 sec. per terminal
5) Eutectic solder ( rosin flux filled ) should be used.
6) Avoid using flux, because it may penetrate the LCM and the LCM may be contaminated when cleaning is required. Moreover, reel off the protective film after soldering the I / O terminals is completed. In this way surface contamination caused by the dispersion of flux while soldering can be avoided.

Removing the wiring
When a lead wire or a connector soldered to the I / O terminals of LEM is to be removed, remove it after the solder at the connection part has melted sufficiently because the I / O terminals is insterted into a thoungh hole. If forcefully removed, it may cause the terminal to break or peel. It is recommended to use a suction-type solder sucker. Moreover, do not repeat wiring by soldering more than 3 times.

Excess Electric Current Protection

Liquid crystal modules are generally not designed with current limiting circuitry on board.
Therefore, when designing your products, use a power supply that has current limiting protection circuitry built in.