What does LCM mean?
Author:Wang Yurong Time:2021-07-22 12:27 Browse(197)
LCM(LCD
LCM (LCD module) refers to the assembly of LCD, connector, control and drive circuit, PCB circuit board, backlight, structure and so on.
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What does LCM mean?

LCM provides users with a standard LCD display driver interface (4-bit, 8-bit Compared with LCM, glass is a more integrated LCD product.
for small size LCD display, LCM can be easily connected with various microcontrollers (such as MCU); However, for large size or color LCD display, it usually takes up most of the resources of the control system or can not achieve control at all, such as 320 × 240 256 color LCM, with 20 fields per second (i.e. one second full screen refresh display 20 times), the amount of data transmitted in one second is as high as 320 × two hundred and forty × eight × 20=11.71875mb or 1.465mb. If the standard MCS-51 series single chip microcomputer is used to process the data, it is assumed that the MOVX instructions are repeatedly used to continuously transmit the data. Considering the address calculation time, at least a 421.875mhz clock is needed to complete the data transmission, which shows the huge amount of data to be processed.
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the higher the resolution, the higher the scanning accuracy, It can be divided into vertical resolution and horizontal resolution.
vertical resolution refers to the number of pixels per millimeter displayed on the vertical horizontal line.
horizontal resolution refers to the number of pixels per millimeter displayed on the parallel horizontal line.
according to the international standards of three types of fax machines.
the horizontal resolution is 8 pixels / mm, so the resolution of fax machines is generally expressed as 8 pixels / mm × Vertical pixel / mm,Generally, we omit the horizontal resolution and only use the vertical resolution to express the resolution.
the vertical resolution mainly includes standard 3.85 pixels / mm.
fine 7.7 pixels / mm and super fine 15.4 pixels / mm.
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LCM process.
LCM process refers to the liquid composite molding process, which is based on RTM, liquid composite molding RFI and RRIM are the representative liquid molding technologies for composite materials.
the main principle is to lay the preform of reinforced materials in the mold cavity according to the performance and structure requirements.
the injection equipment is used to inject the special injection resin into the closed mold cavity or heat and melt the resin film in the mold cavity.
the mold has peripheral sealing and fastening, and injection and exhaust systems to ensure the resin flow All the gas in the mold cavity can be discharged smoothly and the fiber can be soaked thoroughly.
and the mold has a heating system, which can be used for heating and curing to form the composite component.
LCM (liquid crystal module).
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when LCM is used, the following points should be paid attention to:
1. Installation.
the LCD module is installed on the equipment and instruments with the mounting holes on PCB.
because of the following reasons, the LCM is easy to use Because the display screen inside the module is composed of two thin pieces of glass, it is easy to damage, Special care should be taken during installation and application.
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2. Module cleaning.
when cleaning the module,
use a soft cloth dipped in a little solvent (recommended below) to gently wipe it.
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- isopropanol.
- ethanol.
avoid wiping the display surface with dry or hard objects to avoid damaging the polarizer.
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do not use the following solvents:
- water.
- ketones.
- aromatic compounds.
3. Prevent static electricity.
the driving IC used on the LCD module is C-MOS LSI.
therefore, do not connect any unused input terminal to VDD or VSS.
do not input any signal to the module before the power is turned on, and ground the operator's body, workbench and assembly table, The installation equipment should be protected from static electricity.
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4. Packaging.
LCD module should avoid violent vibration.
or falling from height.
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in order to prevent module aging.
avoid working or storing in direct sunlight or high temperature and humidity.
5. Operation.
LCD module must be driven within the specified voltage range.
higher than the specified driving voltage will shorten the driving time  The life of LCD module.
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DC current will cause LCD degradation.
therefore, DC drive should be avoided.
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when the temperature is lower than the working temperature range, the response time of LCD will be significantly longer.
when the temperature is higher than the working temperature range, the response time of LCD will be significantly longer, The color of LCD is darkened.
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the above phenomenon will return to normal when the working temperature is restored.
it is not a product quality problem.
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if the display area is pressed by force under working condition, some characters will display errors, However, it will return to normal after being closed once.
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the condensation on the electrode terminal will cause open circuit due to electrochemical reaction.
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at the highest working temperature.
the humidity should be less than 50% RH.
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6. Storage.
if it is stored for a long time (such as one year), the following methods are recommended:
-Seal the module in polyethylene plastic bag.
keep it away from moisture.
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- keep it away from light and the temperature is within the specified storage temperature range.
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- avoid any object touching the surface of polarizer during storage.
(it is recommended to store it in the inner packaging bag at the time of delivery).
7. Safety.
it is recommended to break the damaged or useless LCD module into pieces and clean the liquid crystal with ethanol and propanol.
Then it needs to be burned.
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if you accidentally stick the leaked liquid crystal in the damaged LCD screen on your hand.
please clean it with soapy water.
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the resolution of the fax is the scanning density.
the higher the resolution, the higher the scanning accuracy, It can be divided into vertical resolution and horizontal resolution.
vertical resolution refers to the number of pixels per millimeter displayed on the vertical horizontal line.
horizontal resolution refers to the number of pixels per millimeter displayed on the parallel horizontal line.
according to the international standards of three types of fax machines.
the horizontal resolution is 8 pixels / mm, so the resolution of fax machines is generally expressed as 8 pixels / mm × Vertical pixel / mm, we generally omit the horizontal resolution and only use the vertical resolution to express the resolution.
there are three kinds of vertical resolution: Standard 3.85 pixel / mm.
fine 7.7 pixel / mm and super fine 15.4 pixel / mm.
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LCM (liquid composite molding.
composite liquid molding process), which is based on RTM, ultra-fine 7.7 pixel / mm and ultra-fine 15.4 pixel / mm RFI and RRIM are the representative liquid forming technologies for composite materials.
the main principle is to lay the preform of reinforced materials in the mold cavity according to the performance and structure requirementsThe special injection resin, such as the resin film in the closed mold cavity or heated melt mold cavity, is injected by injection equipment.
the mold has a peripheral sealing and fastening system, and an injection and exhaust system, so as to ensure the smooth flow of resin, discharge all the gas in the mold cavity and thoroughly infiltrate the fiber.
and the mold has a heating system, which can be heated and solidified to form composite components.
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LCM (liquid crys) Total module.
is the liquid crystal module.
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is the liquid crystal module
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