What is LCM(LCD Module)?

- Mar 06, 2020-


LCM (LCD Module) is an LCD display module and a liquid crystal module, which refers to components that assemble liquid crystal display devices, connecting parts, peripheral circuits such as control and driving, PCB circuit boards, backlights, and structural parts.


Drive interface


LCM provides users with a standard LCD display driver interface (there are different types of 4-bit, 8-bit, VGA, etc.). The user operates according to the interface requirements to control the LCD to display correctly. Compared with glass, LCM is a more integrated LCD product. For small-size LCD displays, LCM can be easily connected to various microcontrollers (such as microcontrollers); however, for large-size or color LCD displays, general Will occupy a considerable part of the resources of the control system or cannot be controlled at all, such as 320 × 240 256-color color LCM, displayed at 20 fields / second (that is, full-screen refresh display 20 times per second), only data transmitted in one second The amount is as high as: 320 × 240 × 8 × 20 = 11.71875Mb or 1.465MB. If the standard MCS-51 series single-chip microcomputer is used for processing, assuming that the MOVX instruction is repeatedly used to continuously transmit these data. Considering the address calculation time, at least 421.875MHz clock In order to complete the transmission of data, it can be seen that the amount of processed data is huge.


The resolution of a 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 displayed per millimeter on the vertical horizontal line, and horizontal resolution refers to the number of pixels displayed per millimeter on the parallel horizontal line. According to the international standards of three types of facsimile machines, the horizontal resolution is 8 pixels / mm, so the resolution of the facsimile machine is generally expressed as 8 pixels / mm × vertical pixels / mm. Generally, we will save the horizontal resolution and only use vertical Resolution to indicate resolution. Vertical resolution mainly has three standards: 3.85 pixels / mm, fine 7.7 pixels / mm, ultra-fine 15.4 pixels / mm.


LCM process


The LCM process (Liquid Composite Molding) refers to liquid composite molding technologies such as RTM, RFI, and RRIM. The main principle is to first lay down a preform of reinforced material designed according to performance and structural requirements in the mold cavity, and use an injection device to inject a special injection resin into the closed mold cavity or heat-melt the resin film in the mold cavity. The mold has a peripheral seal and fastening, and an injection and exhaust system to ensure that the resin flows smoothly and exhausts all the gas and thoroughly wet the fiber in the mold cavity. The mold has a heating system that can be cured by heating to form composite material components. LCM (Liquid Crystal Module), which is a liquid crystal module.