The liquid crystal display module is a component that assembles liquid crystal display devices, connectors, integrated circuits, PCB circuit boards, backlights, and structural parts together. The English name is "LCD Module", or "LCM" for short, and the Chinese name is "LCD Module". In fact, it is a commercial part. According to the relevant national standards of our country: only integral parts that cannot be split are called "modules", and those that can be split are called "components". Therefore, the standard name should be called "liquid crystal display component". But for a long time people have been accustomed to call it "module".

The liquid crystal display device is a high-tech basic component. Although it is widely used, it is still difficult for many people to use and assemble. Especially for dot-matrix liquid crystal display devices, users will feel incapable. The special connection method and the required special equipment are not understood and possessed by everyone. Therefore, the users of the liquid crystal display device hope that someone will do the work for them. The liquid crystal display device is integrated with the control and drive integrated circuits to form a functional part. The user only needs to It can be assembled into a complete system using traditional techniques.

Broadly speaking, all components assembled by liquid crystal display devices and integrated circuits belong to "modules", but in fact, what we usually call "modules" mainly refers to dot matrix liquid crystal display modules assembled by dot matrix liquid crystal display devices, Especially because it is a dot-matrix liquid crystal display device product, except for some special large batches of some varieties (such as electronic dictionaries, communication products), manufacturers are directly supplying liquid crystal display devices to users, almost all general-purpose dot matrix liquid crystal display devices are It is supplied to users only after being processed into a module, so it is easy to form the misunderstanding that "liquid crystal module" is "dot matrix liquid crystal module".

1. Digital LCD module

This is a functional part assembled by a segment type liquid crystal display device and a dedicated integrated circuit, which can only display numbers and some identification symbols. Segment LCD devices are mostly used in portable and pocket devices, such as BP phones, telephones, electronic watches, calculators, MP3s, etc .; they are also used in some instruments, such as car audio and fuel dispensers. Due to the small size of these devices, the display part is not designed as a separate component as much as possible. Even if some application areas require separate display components, it should also have some information reception, processing, Functions such as storage delivery are popular in the market because of their general and specific functions. Common digital display liquid crystal display modules are as follows.

1. Counting module

This is a count display part assembled by a seven-segment liquid crystal display device with different digits and a decoding driver, or a counter. It has the functions of recording, processing and displaying numbers. At present, the main products that can be seen on the Chinese market are the unit liquid crystal display device display module driven by the CD4055 decoding driver, and the integrated circuits such as ICM7211, ICM7231, ICM7232, CD1543, UPD145001, HD44100 and the corresponding supporting liquid crystal display devices. 4 bit, 6 bit, 8 bit, 10 bit, 12 bit, 16 bit counting module. When choosing this type of counting module, you must pay attention to the following points:

Clarify the function: Although they are all called "counting modules", most of them cannot be counted directly. Some of their input ports are only in the form of BCD code interface, some are in the form of BCD code plus strobe input interface, and others are directly connected to serial and parallel ports. If you need to calculate or record a For serial numbers, the corresponding circuit must also be configured. Of course, there are products that have a counting circuit on the module.