LCD module

Technical characteristics

LCM is a higher integrated LCD product compared to glass. For small -sized LCD display, LCM can be more convenient to connect to various microcontrollers (such as single -chip machines); however, for large -sized or color LCD display, generally It will occupy a considerable part of the resources or unable to control the control system. For example, 320 × 240 256 color LCM is displayed in 20 games/second (that is, 20 times in 1 second, 20 times), and data transmitted only in one second The quantity is as high as: 320 × 240 × 8 × 20 = 11.71875MB or 1.465MB. If the standard MCS51 series single -chip microcomputer is processed, assuming repeatedly use the MOVX instruction to continuously transfer these data, consider the address calculation time, at least 421.875mHz clocks can be completed to complete The transmission of data shows the huge amount of data processing.

Precautions for Folding Edit this paragraph

LCD module is a component that assembles Shanghai LCD devices and control, driving circuit and line board PCB. He can directly connect to the computer. When using this module, in addition to the precautions when the general LCD display device is used, it should also be assembled. Pay attention to the following items during use:

Treatment protective film

There is a protective film on the surface of the finished LCD device on the installed module to prevent the surface from decorating. Do not unveil it before the end of the machine assembly, so as not to soil or defile the display surface.

Pad

It is best to install a pad about 0.1mm between the module and the front panel. The panel should also remain absolutely flat. It is guaranteed that it does not produce distortions after assembly. And improve seismic performance.

Strictly prevent static electricity

The control and driving circuit in the module are low -voltage and micro -power CMOS circuits, which are easily penetrated by electrostatic, and the human body sometimes produces a few high -voltage static electrical electrical electrical electrical electrostatic, so in operation, assembly, and use in use Be careful to prevent static electricity strictly. to this end:

1) Do not touch the external lead with your hands, the circuit and metal box on the circuit board.

2) If you must directly contact, keep the human body module the same potential or ground the human body well.

3) The soldering iron used for welding must be well grounded without leakage.

4) The operating electric cone and other tools must be well grounded without leakage.

5) Do not use a vacuum vacuum cleaner for cleaning. Because it produces strong static electricity.

6) Dry air will also generate static electricity. Therefore, the humidity of the working room should be above RH60%.

7) A resistors should be formed between the ground, the workbench, chair, shelf, carts, and tools to maintain the same potential, otherwise static electricity will also be generated.

8) When removing or returning to the packaging bag or moving position, be careful not to generate static electricity. Don’t change or abandon the original packaging at will.

Static breakdown is an irreplaceable damage. Be sure to pay attention and not care.

Precautions during assembly operation.

The module is carefully designed and assembled. Do not process it at will and repair it.

1) The metal box cannot be arrested at will and disassembled.

2) Do not modify the shape of the PCB board at will, assembled holes, lines and components.

3) Do not modify the conductive adhesive bar.

4) Do not modify any internal bracket.

5) Don’t touch, fall, fold, twist the module.

welding

In the external welding module and the interface circuit, the operation should be performed in accordance with the following procedures.

1) The temperature of the soldering iron head is less than 280 ℃

2) Welding time is less than 3-4s

3) Welding material: common crystal type, low melting point.

4) Do not use acidic welding.

5) Do not exceed 3 times for repeated welding, and each time it is repeatedly needed to be 5 minutes/

The use and maintenance of modules

1) When the module uses the access power and disconnect power, it must be performed in the schedule. That is, you must enter the signal level at the positive power supply (5 ± 0.25V) to enter the signal level. If you enter the signal level before the power supply is stable, or after disconnection, the integrated circuit in the module will be damaged and the module will be damaged.

2) The dot matrix module is a highway -number LCD display device. The display contrast, the perspective angle and temperature, and the driving voltage is very related. Therefore, it should be adjusted until the best contrast and perspective. If VEE is too high, it will not only affect the display, but also affect the life of the display device.

3) When using the lower limit of the working temperature range, the response is very slow. When the upper limit of the working temperature range is used, the entire display surface will turn black. This is not damaged. The recovery temperature range can return to normal.

4) Press the display part with force, which will produce an abnormal display. As long as the power is cut off, it can be recovered by re -access.

5) When the liquid crystal display device or the surface of the module is fog, do not work to work, because the electrode chemical response will occur at this time to generate a disconnection.

6) Remaining images for long -term use in the sun and strong light.

Module storage

If long -term (such as more than a few years) storage, we recommend the following ways.

1) Put a polyethylene pocket (preferably anti -static coating) and seal the mouth.

2) Storage between -10-+35 ° C.

3) Put it in the dark to avoid strong light.

4) Never put any items 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 ° C, 85%RH, or 60 ° C and less than 60%RH, but it should not exceed 168 hours.