LCD display precautions LCD, LCM, module
- Apr 25, 2018 -

                 

First, deal with protective film:

A protective film is attached to the finished surface of the module to prevent the customer from contaminating the display surface during assembly. Therefore, please do not remove it before the end of the assembly to avoid soiling or damage the display surface.

Second, install cushion:

It is best to add a pad of about 0.1 mm between the module and the front panel. The panel should also remain flat to avoid distortion after assembly and improve its anti-vibration performance.

Third, prevent static electricity:

The control and drive circuits in the module are low-voltage, micro-power CMOS circuits that are vulnerable to electrostatic breakdown. Electrostatic breakdown is an irreparable damage, and the human body sometimes produces high voltages of up to tens of volts or hundreds of volts. Static electricity, therefore, should be extremely careful in operation, assembly and use, and prevent static electricity. to this end:

1. Do not touch the outer leads, circuit boards, and metal frames with your hands;

2. If it must be in direct contact, keep the human body and the module at the same potential, or ground the human body well;

3. The soldering iron used for welding and the power tool used for operation must be well grounded, with no leakage;

4. Do not use a vacuum cleaner for cleaning because it generates strong static electricity;

5. Air drying also generates static electricity. Therefore, the humidity in the workplace should be above RH60.

6. When removing or returning the bag or moving it, take care to prevent static electricity. Do not change the packaging or discard the original packaging.

Fourth, the assembly operation precautions:

1. The modules are carefully designed and assembled. Do not arbitrarily process and recondition them.

2. The metal frame claws must not be twisted or disassembled;

3. Do not arbitrarily modify the PCB board shape, assembly holes, line parts;

4. Do not modify the conductive tape;

5. Do not modify any internal brackets;

6. Do not touch, drop, bend or twist the module.


Fifth, welding:

When soldering the external leads and interface circuits of the module, the following procedures should be followed.

1. The tip temperature is less than 280 °C;

2. The welding time is less than 3-4s;

3. Welding material: eutectic type, low melting point;

4. Do not use acidic fluxes;

5. Do not repeat the weld more than 3 times, and each repeat takes 5 minutes. The

Sixth, the use and maintenance of the module:

1. The outer leads of the module must not be connected incorrectly. When you want to debug the LCD module, please pay attention to the correct wiring, especially the wiring of the positive and negative power supply can not be wrong, otherwise it may cause over-current, over-voltage and burning.

Damage to the components of the liquid crystal module such as chip damage on the circuit;

2. When the module is in use, it should be connected to the power supply and disconnected from the power supply. The input signal level must be entered after the positive power supply is connected. If the signal level is input before or after the power supply is stabilized, it may be damaged.

ICs and circuits in the module

3. When the module is used, the sequence of accessing the logic power and driving power should be the first logic power, and the back drive power; when the power is off, the power should be driven first and the logic power should be followed. Doing so helps keep the screen good

Good display effect and avoid voltage shock damage at power on and power off. Therefore, it is recommended to use a DC-DC power supply with a control module as the driving power source.

4. The contrast, viewing angle, temperature, and driving voltage of the dot matrix LCD module are greatly related. Therefore, if the VEE adjustment is too high, it will not only affect the display, but also shorten the service life of the module;

5. Because of the physical characteristics of the liquid crystal material, the contrast of the liquid crystal will change accordingly with the change of temperature. Therefore, the negative voltage value you add should be adjusted accordingly with the temperature, which is roughly the temperature change.

At 10°C, the voltage changes by 1 volt. To meet this requirement, you can make a temperature compensation circuit or arrange a potentiometer to adjust the negative voltage value with temperature;

6. Should not be used outside the specified operating temperature range, and should not be stored outside the storage limit temperature range. If the temperature is lower than the crystallization temperature, the liquid crystal will crystallize. If the temperature is too high, the liquid

Crystals will become isotropic liquids, destroy the molecular orientation, and make the device scrapped;

7. Press hard on the display section and an abnormal display will appear. At this time, cut off the power supply, wait for a while, and then restart the power supply to resume normal operation;

8. When the surface of the liquid crystal display device or module is fogged, do not work with electricity because it will cause the chemical reaction of the electrode, resulting in disconnection;


9. When used under sunlight and strong light for a long time, residual images will be generated in the covered area.

Seven, module storage:

For long-term storage (such as several years), we recommend the following methods:

1. Pack in polythene pocket (preferably anti-static coating) and seal the mouth;

2. Store between -10°C and 35°C;

3. Put in dark places and avoid strong light;

4. Never put anything on the surface;

5. Strictly avoid storage under extreme temperature/humidity conditions.


9. When used under sunlight and strong light for a long time, residual images will be produced in the covered area.

Seven, module storage:

For long-term storage (such as several years), we recommend the following methods:

1. Pack in polythene pocket (preferably anti-static coating) and seal the mouth;

2. Store between -10°C and 35°C;

3. Put in dark places and avoid strong light;

4. Never put anything on the surface;

5. Strictly avoid storage under extreme temperature/humidity conditions.