Mobile Phone LCD Screen Quality Control Expert

Use of LCD module

by:Kimeery     2021-08-22
The liquid crystal module is a component that assembles the liquid crystal device with the LCD controller, the drive circuit and the circuit board PCB. He can directly connect with the computer. When using this type of module, in addition to the precautions for the use of general liquid crystal display devices, you should also pay attention to the following matters when assembling: 1. Treating the protective film There is a protective film on the surface of the finished LCD screendevice of the assembled module , To prevent staining the surface during assembly. It must not be removed before the assembly of the whole machine is finished, so as not to stain or contaminate the display surface. 2. Installing a gasket It is better to install a gasket of about 0.1mm between the module and the front panel. The panel should also remain absolutely flat. , One ensures that no twisting force is generated after assembly. And improve the seismic performance. 3. Strictly prevent static electricity. The control and drive circuit in the LCD screenmodule is a low-voltage, low-power CMOS circuit, which is very easy to be broken down by static electricity. The human body sometimes generates high-voltage static electricity up to several volts or hundreds of volts, so it is in operation , Assembly, and use must be careful to prevent static electricity. For this reason: 1) Do not touch the outer leads, the circuit on the circuit board and the metal frame with your hands. 2) If direct contact is necessary, one module of the human body should be kept at the same potential, or the human body should be well grounded. 3) The soldering iron used for welding must be well grounded and there is no leakage. 4) The electric cone and other tools used for operation must be well grounded and there is no leakage. 5) Do not use a vacuum cleaner for cleaning. Because it will generate strong static electricity. 6) Dry air will also generate static electricity. Therefore, the humidity in the working room should be above RH60%. 7) Resistive contact should be formed between the ground, workbench, chair, shelf, cart and tools to maintain the same potential, otherwise static electricity will also be generated. 8) When taking out or putting it back in the packaging bag or moving the position, be extra careful not to generate static electricity. Do not change or discard the original packaging at will. 9) Electrostatic breakdown is a kind of irreparable damage, so be careful not to be careless. 4. Matters needing attention during assembly operation. The module is carefully designed and assembled, please do not process or trim by yourself. 1) The metal frame should not be twisted or disassembled at will. 2) Do not modify the shape, assembly holes, circuits and components of the processed PCB at will. 3) Do not modify the conductive tape. 4) Do not modify any internal supports. 5) Do not touch, drop, bend, or twist the module. 5. Welding on the external and interface circuit of the welding module should be operated in accordance with the following procedures. 1) The temperature of the soldering iron tip is less than 280℃ 2) The soldering time is less than 3-4S 3) Welding material: eutectic, low melting point. 4) Do not use acidic flux. 5) Do not repeat welding more than 3 times, and each repetition requires an interval of 5 minutes/6. Use and maintenance of the module 1) When the module is used to connect and disconnect the power supply, it must be carried out according to the timing chart. That is, it must be input from a positive power supply (5±0.25V) before the signal level can be input. If the signal level is input before the power is stably connected or after it is disconnected, the integrated circuit in the module will be damaged and the module will be damaged. Power 4.75V 4.75VVee>0>0 signal>0Vee>0a, power-on sequence b, power-off sequence 2) Dot matrix module is a high-channel number of LCD screendevices, display contrast, viewing angle, temperature, and driving voltage are closely related. Therefore, Vee should be adjusted to the best contrast and viewing angle. If Vee is adjusted too high, it will not only affect the display, but also affect the life of the display device. 3) When used at the lower limit of the specified operating temperature range, the display response is very slow. When used at the upper limit of the specified operating temperature range, the entire display surface will turn black. This is not damage. Restore the temperature range and it will return to normal. 4) Press the display part hard, it will produce abnormal display, just cut off the power and reconnect it to recover. 5) When the surface of the liquid crystal display device or the module is fogged, do not work with electricity, because this will cause a chemical reaction of the electrode and break the wire. 6) After long-term use in sunlight and strong light, the shaded part will produce residual images. 7. If the storage of the module is to be stored for a long time (such as several years or more), we recommend the following methods. 1) Put into a polyethylene bag (preferably with anti-static coating) and seal the mouth. 2) Store between -10 and +35°C. 3) Keep it in a dark place and avoid strong light. 4) Never put anything on the surface. 5) Strictly avoid storage under extreme temperature/humidity conditions. It must be stored under special conditions. It can also be stored at 40℃, 85%RH, or 60℃, less than 60%RH, but it should not exceed 168 hours. Please refer to Xingyuhe's introduction on LCD screen maintenance for what issues should be paid attention to in the use of LCD screens.
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