LCD module is a component that assembles liquid crystal display devices, connectors, integrated circuits, PCB boards, backlight, and structural parts together. The English name is LCD Module, or LCM for short. It’s actually a commercial component. According to China’s relevant national standards, only the integral parts that cannot be detachable are called «modules», and the detachable parts are called «components». So the specification should be called «liquid crystal display component». But people have long been used to calling them «modules».
From a broad sense, those who by the liquid crystal display device and integrated circuit together parts belong to «modules», but in fact we say normally «module» mainly show array assembly of dot matrix LCD module, liquid crystal display device is special because dot matrix liquid crystal display device products in addition to large quantities of some varieties for some (such as machine translation, communication), Manufacturers are directly to the user supply of LIQUID crystal display devices, almost all of the universal dot matrix liquid crystal display devices are processed into modules to supply users, so it is easy to form «LCD module» is «dot matrix liquid crystal module» misunderstanding.
Liquid crystal dot matrix character module
It is composed of dot matrix character LIQUID crystal display device and special row, column drivers, controllers and necessary connectors, structural parts assembled, can display digital and Western characters. The dot matrix character module itself has a character generator, large display capacity, rich functions. Generally, the module can display at least 8 bits of 1 line or 16 bits of l line or more characters. The lattice arrangement of such modules is composed of 5×7, 5×8, or 5×11 pixel arrays. Each group is 1 bit, there is a bit interval between each group, and there is a line interval between each line, so graphics cannot be displayed. Its specifications are mainly shown in the following table:
eight
1 line; 2 rows
16
1 line; 2 lines; Line 4
20
1 line; 2 lines; Line 4
24
1 line; 2 lines; Line 4
32 –
1 line; 2 lines; Line 4
40
1 line; 2 lines; Line 4
In general, there is a character library CGROM which has solidified 192 characters in the module control and driver, and there is also a random memory CGRAM which allows users to set up special characters, allowing users to set up 8 5×8 dot matrix characters.
Two, dot matrix graphic liquid crystal module
This module is also a kind of dot matrix module, which is characterized by continuous arrangement of dot matrix pixels and no space between rows and columns in the arrangement. Therefore, continuous, complete graphics can be displayed. Since it is also made up of X-Y matrix pixels, it can display characters as well as graphics. 1. The row and column driven This is a must external dedicated controller module, the module only equipped with universal row, column, drive, this drive is actually only for general driver output side of pixels, while input is generally only four of the following data input, shift signal input end, latch input end, the ac signal input end, etc., such as HD44100, IID66100, etc. This kind of module must be connected with external control circuit, such as HD61830, SEDl330 and so on to connect with the computer. This type of module is the most numerous and most common. Although a custom controller is required, it also gives the customer the freedom to choose a different controller.
- Row, column drive – control type
This is a module that can interface directly with the computer and control the driver directly. The column driver used by this kind of module has I/O bus data interface, which can directly hang the module on the bus of the computer without special controller, so it is beneficial to reduce the cost of the whole system. For the pixel number is not large, the function of the machine is not much, the computer software programming and very familiar with the user is very suitable. But it will take up some of your system’s resources. - Row and column control type
This is a built-in controller – type dot matrix graphics module. It’s also a popular one. This module is not only equipped with row and column drivers such as type I, but also equipped with special controllers such as T6963C. This controller is the interface LCD driver and computer, it is controlled by computer in the most simple way, and receive feedback to computers of all kinds of information, through their own independent information processing implementation management of the display buffer, the well needed to provide to drive all kinds of signals, pulse and control implementation module display function of the driver. The controller has its own set of special instructions and its own character generator CGROM. Users must be familiar with the detailed specifications of this controller before they can operate it. This kind of module makes the user get rid of a series of work such as the design, processing and production of the controller, and makes the computer avoid the tedious control of the display, saving the internal resources of the host system.