The graphic lcd module is also a type of dot matrix liquid crystal module. Its characteristic is that the dot matrix pixels are arranged continuously, and there is no space between rows and columns. Therefore, continuous and complete graphics can be displayed. Since it is also composed of X-Y matrix pixels, in addition to displaying graphics, it can also display characters.

There are three types of dot matrix graphics modules:
1. Row and column driven
The manufacturer of the graphic lcd module tells you that this is a type of module that must be connected to a dedicated controller. The module is only equipped with general row drivers and column drivers. This type of driver is actually only a general driver output terminal for pixels. , and the input terminals are generally data input terminals with less than 4 bits, shift signal input terminals, latch input terminals, AC signal input terminals, etc. The number of such modules is the largest and the most common. Although it is necessary to use a self-configured controller, it also leaves customers the freedom to choose different controllers.
2. Row and column drive-controlled
This is a module that can directly interface with the computer and rely on the computer to directly control the drive. The manufacturer of the graphic lcd module tells you that the column drivers used by this type of module all have I/O bus data interfaces, and the module can be directly hung on the bus of the computer, thus eliminating the need for a dedicated controller, so for It is beneficial to reduce the cost of the whole system. It is very suitable for users who are very familiar with the programming of computer software and the number of pixels is not large, the function of the whole machine is not much. However, it may take up some of your system's resources.
3. Row and column control
This is a dot matrix pattern LCD module with built-in controller. The manufacturer of the graphic lcd module tells you that it is also a popular one. This kind of module is not only equipped with row and column drivers such as the first type, but also equipped with a dedicated controller. This kind of controller is the interface between the LCD driver and the computer. It is controlled by the computer in the simplest way to receive and feed back all kinds of information from the computer. It realizes the management of the display buffer through its own independent information processing. Various signals and pulses are provided to the driver, and the driver is manipulated to realize the display function of the module.
The above are the three types of LCD modules introduced by graphic lcd module manufacturers. I hope they will be helpful to you.