LCM display type
A liquid crystal display module is a component that assembles liquid crystal display devices, connectors, integrated circuits, PCB circuit boards, backlights, and structural parts. The English name is "LCD Module", abbreviated as "LCM", and the Chinese name is generally called "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 splittable parts 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 find it impossible to start. The special connection method and the required special equipment are not understood and possessed by everyone. Therefore, users of liquid crystal display devices hope that someone will do the work for them to assemble the liquid crystal display device 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 processes.
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), the manufacturer directly supplies liquid crystal display devices to users, almost all general-purpose dot matrix liquid crystal display devices are It is supplied to the user after being processed into a module, so it is easy to form the misunderstanding that the “liquid crystal module†is the “dot matrix liquid crystal moduleâ€.
1. Digital display liquid crystal 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 counting display component 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 display module of the unit liquid crystal display device driven by the CD4055 decoding driver, and the integrated circuits such as ICM7211, ICM7231, ICM7232, CD1543, UPD145001, HD44100 and the corresponding supporting LCD devices 4-digit, 6-digit, 8-digit, 10-digit, 12-digit and 16-digit counting modules. 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 In order to serialize digital elements, the corresponding circuit must also be configured. Of course, there are also products that match the counting circuit on the module.
Accurate structure: Liquid crystal display devices have different installation methods and installation structures. Therefore, pay attention to its structural characteristics when selecting it. Generally speaking, most of these counting modules are made of zebra conductive rubber strips, plastic (or metal) pressing frames and PCB boards. The liquid crystal display device and the integrated circuit are assembled together. There are several types of outer lead terminals such as solder joint type, pin type and circuit board pin type. Pay attention to power supply: A device should use a unified power supply as far as possible. Common liquid crystal display device counting modules have single power supply type and dual power supply type, and have different specifications such as 5V and 9V.
2. The metering module is a module composed of a multi-segment type liquid crystal display device and an integrated circuit chip with functions of decoding, driving, counting and A / D conversion. Because the integrated circuit used has an A / D conversion function, the input analog electrical signal can be converted into a digital display. We know that any physical quantity, even chemical quantity (such as pH, etc.) can be converted into analog electricity, so as long as it is equipped with a certain sensor, this module can achieve any amount of value and display, which is very convenient to use. The integrated circuit models used in the metering module mainly include ICL7106, ICL7116, ICL7126, ICL7136, ICL7135, ICL7129, etc. The functions and characteristics of these integrated circuits determine the functions and characteristics of the metering module. As a measurement product, measurement verification must be carried out according to regulations. Approved by the measurement department, a measurement certificate is posted on the product.
3. Timing module The timing module uses the liquid crystal display device for the longest time in history. Assembling a liquid crystal display device with a timing integrated circuit is a fully functional timer. Because it does not have a finished watch case, it is called a timing module. Although the chronograph module is very versatile, it is difficult to buy a universal and standard chronograph module on the market. You can only buy or order a suitable watch movement from an electronic watch manufacturer. Although the chronograph module and the counter module are similar in appearance, But they are displayed in different ways. The numbers displayed by the timing module are composed of two digits and two digits. Each digit of the counting module is arranged consecutively. Since many timing modules also have timing and control functions, such modules can be widely assembled on some power-on devices such as radio cassette recorders, CD players, microwave ovens, rice cookers and other appliances.
2. Character dot matrix module It is composed of a character dot matrix liquid crystal display device and a dedicated row and column driver, controller, and necessary connectors and structural parts, which can display digital elements and Western characters. The dot matrix character module itself has a character generator, with large display capacity and rich functions. Generally, this kind of module can display 8-bit 1 line or 16-bit or more characters. The dot matrix arrangement of this module is composed of a 5 × 7, 5 × 8 or 5 × 11 pixel array arrangement. Each group is 1 bit, there is a little space between each bit, and there is also a space between each line, so the graph cannot be displayed, and its specifications are mainly shown in the following table:
Generally, there is a character library CGROM with 192 character fonts solidified in the module control and driver, and a random memory CGRAM that allows users to create special characters by themselves, allowing users to create 8 5 × 8 dot characters.
3. Graphic dot matrix liquid crystal module This module is characterized by the continuous arrangement of bit picture elements, and there is basically no space in the arrangement of rows and columns. Therefore, continuous and complete graphics can be displayed. Since it is composed of XY matrix pixels, it can display various characters in addition to graphics.
1. Row and column drive type This is a module that must be connected to a dedicated controller. The module is only equipped with a general row and column driver. This driver actually has only a general drive output for pixels, and an input only Data input terminal with less than 4 digits, shifter signal input terminal, latch input terminal, AC signal input terminal, etc., such as HD44100, HD66100, etc. This type of module must be connected to a control circuit, such as T6963C, SEDl335, etc., to connect to the computer. There are many models of this kind of module, and the application is relatively wide. Although a self-provisioned controller is required, it also leaves the customer the freedom to choose different controllers.
2. Row, column drive-control type This is a module that can directly interface with the computer and rely on the computer to directly control the driver. The column driver used for this type of module has an I / O bus data interface, and the module can be directly hung on the bus of the computer, eliminating the need for a special controller, so it is beneficial to reduce the cost of the entire system. It is 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 some resources of your system.
3. Row and column control type This is a bit graphics module with built-in controller type. It is also the most popular type. This module is not only equipped with row and column drivers such as the first type, but also equipped with special controllers such as T6963C and SED1335. 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. Various signals and pulses needed to manipulate the driver to realize the display function of the module. This controller has its own set of special instructions, and has its own character generator CGROM. The user must be familiar with the detailed instructions of this controller in order to compile. This module allows users to get rid of a series of tasks such as the design, processing, and production of the controller, and avoids the cumbersome control of the display by the computer, saving the internal resources of the host system. There are also products with a single chip integrated drive and control, mainly used in portable products, such as mobile phones, MP3, PDA, electronic dictionaries, handheld POS machines and so on.
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