Mobile Phone LCD Screen Quality Control Expert

Liquid crystal display module (LCM) with different display types and drivers

by:Kimeery     2021-08-24
From the schematic diagram of the structure of the liquid crystal module below, it can be seen that the liquid crystal display module is simply an electronic device that combines more than a dozen components such as backlight components, LCD screendevices, control components, diffusion components, display components, and structural components. Display module. Kimeery is an LCD manufacturer located in Shiyan Town that specializes in Ru0026D, manufacturing and sales of LCD liquid crystal displays, LCM liquid crystal display modules (sets), LED backlights and LED digital tubes for more than ten years. The LCD manufacturers developed and manufactured from our company Display modules can be divided into the following three categories according to different display types. 1. The segment LCD module can only display numbers and some identification symbols. Segment LCD devices are mostly used in portable and pocket-sized devices. Due to the small size of some devices, the display part should not be designed as a separate component as much as possible. Even if a separate display component is required in some application fields, it should also have some information receiving, processing, and processing functions in addition to the display function. Functions such as storage and delivery are welcomed by the market because they have a certain general and specific function. Commonly used segment LCD driver chips are HT1621 series, PCF8566 series, HD44100 (SPLC100 can be substituted) series. There are also some dedicated clock chips used as segment LCD drivers, which can simplify the peripheral circuit and greatly reduce the workload of programming. PCF8566 series chips are commonly used in the automotive electronics industry because they support I2C bus control. 2. Liquid crystal dot matrix character module It can display numbers and western characters. It is assembled by dot matrix character LCD screendevice and dedicated row and column drivers, controllers and necessary connectors and structural parts. This kind of dot matrix character module has a character generator, large display capacity and rich functions. Generally, this kind of module can display at least 8-bit 1 line or 16-bit 1 line or more characters. The dot matrix arrangement of this module is composed of a group of 5×7, 5×8 or 5×11 pixel dot matrix arrangements. Each group is 1 bit, there is a little space between each bit, and there is also a line space between each line, so graphics cannot be displayed. Generally, there is a character library CGROM with 192 character fonts solidified in the module control and driver, and it also has a User-defined random access memory CGRAM for special characters can be created, allowing users to create 8 5×8 dot matrix characters. 3. Dot-matrix graphic LCD module can display continuous and complete graphics. This type of module is also a kind of dot-matrix module. Its characteristic is that the dot-matrix pixels are arranged continuously, and there is no space between rows and columns in the arrangement. Since it is also composed of X-Y matrix pixels, it can display characters in addition to graphics. According to different drivers, the dot matrix LCD module has the following three types: 1. Row and column drive type This is a module that must be externally connected to a dedicated controller. The module is only equipped with a general row and column drive. In fact, there are only general drive output terminals for pixels, and the input terminals generally only have data input terminals below 4 bits, shift signal input terminals, latch input terminals, AC signal input terminals, etc., such as HD44100, KS0086 and so on. This kind of module must be connected to the computer with an external control circuit, such as T6963C, S1Dl3305, etc. This kind of module has the largest number and is the most common. Although it is necessary to use a self-configured controller, it also leaves customers with the freedom to choose different controllers by themselves. 2. Row and column drive-control type This is a module that can directly interface with the computer and directly control the drive by the computer. The column driver used by this type of module has an I/O bus data interface, and the module can be directly hung on the computer bus, eliminating the need for a dedicated controller, so it is beneficial to reduce the cost of the whole system. It is very suitable for users who have a small number of pixels, few functions of the whole machine, and are familiar with computer software programming. But it will take up part of your system's resources. 3. Row and column control type This is a dot matrix graphics module with a built-in controller. It is also a more popular type. This module is not only equipped with row and column drivers such as the first type, but also equipped with dedicated controllers such as T6963C. This controller is the interface between the LCD driver and the computer. It is controlled by the computer in the simplest way. It receives and feeds back various information from the computer. It manages the display buffer through its own independent information processing and provides it to the driver. Various signals and pulses needed to manipulate the driver to realize the display function of the module. This kind of controller has its own set of special instructions and its own character generator CGROM. The user must be familiar with the detailed manual of this controller before making a summary. This kind of module allows users to get rid of a series of tasks such as designing, processing, and manufacturing the controller, and also enables the computer to avoid the cumbersome control of the display, and saves the internal resources of the host system. Xingyuhe Electronics specializes in Ru0026D and manufacturing of LCD liquid crystal displays and LCM (liquid crystal display modules). There is more information about LCD screens here (http://www.xyhlcd.com/know.html).
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