LCD and LCD modules between the comparison

- Feb 11, 2018 -

In our usual life, surely we will know that LCD and LCD modules will be used by many electronic products. However, we will understand the electronic products, however, for the LCD module is to know very little, let's take a look at the LCD screen and LCD module comparison.

- Liquid crystal display module (LCM):

First, the operation precautions:

1, the display is made of glass, do not give mechanical impact, such as falling from a height.

2, Do not exert excessive force on the surface of the display or the connection area of the LCD module as this will result in a change of color tone.

3, If the surface of the LCD module display is dirty, wipe it with a soft, dry cloth. If heavily defaced, use isopropyl alcohol or alcohol (alcohol), moistened cloth to wipe.

4, other solvents may damage the polarizer, especially water, ketones, fragrances and so on.

5, if the logic circuit power off, do not enter the signal.

6, if the display is damaged, the internal liquid crystal leak, do not make it into the mouth. If it gets on your clothes or skin, wash it quickly with soap and water.

7, LCD module display surface of the polarizer is soft, and easy to scratch, careful operation.

8, install the LCD module using the mounting hole, be sure not to distort, bend and deformation. Deformation will have a significant impact on display quality.

9, to avoid open, to be careful sealing the operation of the paper, sharp glass edge, be careful operation.

10, touch the LCD module TAB may lead to abnormal display, do not touch the TAB.

11. Do not pull or bend the I / O lead or backlight lead by force when installing the LCD module.

12, do not disassemble the LCD module, NC feet to be vacant, do not take anything.

13, in order to prevent electrostatic damage to the components, maintain a good working environment.

Second, storage precautions

1, When storing the LCD module, avoid direct exposure to sunlight or fluorescent light. Store the LCD module in an antistatic bag and store it under normal humidity at room temperature. (Avoid high humidity / high temperature and low temperatures below 0 ° C.) If possible, the LCD module should be stored under the conditions of shipment from our company.

a, take the module, do not fall to the ground.

b, assembly tools, such as iron, must be properly grounded.

c, in order to reduce the generation of static electricity, do not perform assembly and other work in a dry environment.

d, LCD module has a layer of protective film of the display. Be careful when removing this protective film as static electricity may be generated.

2, to minimize electrode corrosion. Water droplets, moisture condensation, or currents at high temperatures can accelerate electrode erosion.

- Liquid crystal display (LCD):

1, the liquid crystal display (LCD) should prevent ultraviolet radiation: liquid crystal and polarizer is organic matter, in the ultraviolet light will occur photochemical reaction, deterioration, so the liquid crystal display device assembly should be based on its use and use of the environment to consider whether the need UV filter on the front or other UV protection methods. Avoid prolonged direct sunlight when using.

2, liquid crystal display device cleaning: As the liquid crystal surface of the plastic polarizer and reflector, so the assembly, storage should avoid scratches dirty. In addition, there is a protective film on the front polarizer, which is removed when in use. If the surface contamination of the device, you can use a soft cloth, light cotton wipe treatment. If you must use solvent cleaning, only use isopropyl alcohol (glycerin), alcohol, freon, and must not use acetone, aromatic solvents, such as toluene, or the polarizer on the device surface will be damaged.

3, due to liquid crystal over a certain temperature range will disappear, it must be stored within the specified temperature range and use. Temperature is too high, the liquid crystal disappears, into a liquid, the display surface was black, can not work, please note that at this time do not power, and so reduce the temperature can be self-healing. If the temperature is too low, the liquid crystals begin to form ice crystals, causing permanent damage. In addition to prolonged storage at temperature or under extreme vibration, impact, LCD will produce bubbles.

4, liquid crystal display (LCD) should prevent the erosion of harmful gases: liquid crystal and polarizer is organic, chemical reaction in the harmful gas environment, deterioration, so the use of harmful gases should be taken isolation measures, the other in the machine assembly After a long time, do not conduct long-term sealed storage, to prevent the plastic shell and circuit board cleaners chemical gas concentration is too large damage to the LCD and polarizers.

5, if there is a metal pin LCD, solder pins, the solder joint should be 4mm away from the root or farther place, and can not be over-force, overheating, so as not to damage the connection. The maximum temperature of the junction shall not exceed.

6, LCD is made of two pieces of glass, only 5 ~ 10um between them, very thin. And the glass surface is also coated with a layer of oriented film, it is easy to damage. So should also pay attention to the following points: the surface of the liquid crystal device can not be too large pressure to avoid damage to the orientation layer. In the event of over-pressurization during assembly or hand-press of the device, leave it for an hour before applying power. In the process of power must not remember the dramatic temperature changes. Pressure device should be uniform, only pressure device side, can not be pressed in the middle, can not be tilted hard.

7, to prevent the glass from cracking: As the display device is made of glass, if the loss, the glass will certainly crack, so the whole design must test the assembly method and assembly of vibration and impact resistance.

8, liquid crystal display (LCD) should be applied to prevent DC voltage drive voltage DC component as small as possible. Do not exceed the maximum 50mV, a long time to apply excessive DC components, electrolysis and electrode aging occurs, thereby reducing the life expectancy.

9, the device moisture: Due to low voltage liquid crystal display devices, micro-power, high resistivity liquid crystal materials (up to 1X1010Ω above). Therefore, due to the wet surface of the glass caused by the conductivity of the device may be displayed in the display, the phenomenon of "string" between the paragraphs, so the machine design must consider moisture. Usually, as far as possible placed in the temperature 5 ~ 30 ℃, humidity 65% conditions.


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