Analysis of the Character LCD Modules screen technology

LCD (Liquid Crystal) screen technology has experienced a very long process, from the most primitive to the black and white screen is now being popular color, every technological innovation, all startled a wild waves. Often chatted about the screen, there are always inseparable TFT, STN, OLED, TFT, false color, etc. The term is not often feel confused? Do not worry, in fact, not difficult to understand that knowledge. 20x2 oled
First talk about the principle of the LCD (although boring, but only the first understanding its structure and principle, to understand its technical and technological characteristics targeted in the purchase order, the application and maintenance to be more scientific and reasonable, patience and see) , 1888, Australian botanist Reinitzer (Reinitzer) of cholesterol's role in plants, the use of cholesteric benzene test, inadvertently discovered the LCD, which is an almost completely transparent material presented simultaneously Some characteristics of solids and liquids. Appears from the shape and appearance of the liquid crystal is a liquid crystal type but its molecular structure and exhibit a solid form. The same as the metal in a magnetic field, when subjected to the external electric field, it will produce an accurate molecular ordered; such as alignment of the molecules to be properly controlled, the liquid crystal molecules will allow light to penetrate; light path through the liquid crystal can be constituted to determine its molecular arrangement, which is a feature of the solid. LCD is an organic compound, by a long rod-like molecules. In the natural state, the long axis substantially parallel to the rod-like molecules.
LCD (Liquid Crystal Display, hereinafter referred to as LCD) first feature is the LCD must be poured into two columns with fine grooves between the plane to work properly. These two planes perpendicular to the groove (90 ° intersection), that is, if the molecule on a plane arranged in the north-south, the other thing to the molecular plane of arrangement, which is located between two planar molecules are Forced go into a 90-degree twist state. Since molecules are arranged along the direction of light propagation, so when the light through the liquid crystal is twisted 90 degrees. But when the LCD plus a voltage, the molecules will be re-arranged vertically, so that the light can be directed to go out without any reverse. The second characteristic of LCD is that it relies polarization filters and light itself, natural light in all directions is random divergence, polarization filter is actually a series of increasingly fine parallel lines. These lines form a network, blocking these lines are not parallel with all light polarization filters coincided with the first vertical line, they are able to completely block those already polarized light. Only two filters completely parallel lines, or light itself has been reversed with the second polarization filter to match the light was able to penetrate. LCD precisely by such two mutually perpendicular polarization filter constituted so in normal circumstances should block all attempts to penetrate the light. However, since the two twisted liquid crystal filled between filters, so the light piercing the first filter, the liquid crystal molecules are twisted by 90 degrees, and finally from the second filter in the shell. On the other hand, if it is to add a voltage of the liquid crystal molecules will rearrange and completely parallel, so that the light is no longer turn, so just by the second filter block. In short, the light blocking power, no power will make the light emitted. Of course, you can change the arrangement of the liquid crystal LCD, so that the light emitted at power, when power is not blocked. However, due to the LCD screen is almost always on, so only the "power to the light blocking" of the program in order to achieve the most energy purposes. QVGA lcd
LCD screen can be divided into black and white LCD screen and the LCD color screen, LCD monochrome screen called TN (Twisted Nematic) screen, mainly used in digital watches, calculators, handheld game consoles and other devices, in addition to the power LCD monochrome screen and manufacturing costs lower than LCD color screen, the other not, and color. And with color screen technology matures, black and white LCD screen will eventually quit the stage of history.

FFU intelligent control system oled module

At present, the application areas of FFU, the control system application rate is still relatively low, but also in the international market popular FFU intelligent control system, generally only equipped with brushless DC motor for FFU. Especially in today's global energy more tense, the energy efficiency of the control system is increasingly being valued by people. Each clean room according to the production process, determine the appropriate speed, but they have to consider energy issues. The general control system can adjust the limited range of wind speeds, depending on the requirements can not provide accurate speed, especially outside of 8 hours of rest, still maintain a high speed, which  lcm module  undoubtedly brings a huge energy waste. For this situation, recently introduced the ability to adjust their speed digitization HH-F series FFU intelligent control system. The system is simple, user-friendly, especially according to the specific wind cleanroom requirements (eg 0.37m / s, 0.28m / s), digital set.
Can be flexibly controlled clean room each fan starts and stops and speed, the control system using the repeater technology to solve the problem of limited capacity 485 drive can be controlled infinitely turbines. The control system consists of the following four parts: Lcd display module
◆ Field intelligent controller
◆ wired centralized control
◆ Remote Control
◆ System integrated functions

FFU field intelligent control oled module

Field intelligent control module to microcontroller core processors to achieve control. An intelligent module controls one FFU. Field intelligent control module is divided into voltage regulator module and inverter module, two kinds of intelligent control module enables the following control functions:
1) intelligent module has a strong opening, with optional HART (pluggable) site control can be achieved: by reserving the RS485 interface enables remote centralized control and fault diagnosis and setting: With the optional The remote control module (pluggable) can achieve remote control. 20x2 lcd display
2) through removable handheld enables start and stop FFU and accurate variable speed FFU outlet velocity values ​​can be displayed.
3) The intelligent module enables FFU with energy-saving features.
4) with overload and short-circuit protection functions: overload, prompting alarm unit alarm; short, prompting alarm unit FFU alarm and automatically cut off the power.
Wired control

Wired control mode control mode is optional, it is set aside by field intelligence module RS485 interfaces. In order to meet the needs of different users, we use the control panel and touch screen control modes, the control panel is simple, but the display is not intuitive, and achieve limited functionality; touch screen cost, easy operation, display a rich and powerful.
Touch screen control method consists of the following three components: 1) the central control unit; 2) human-machine interface unit; 3) alarm control unit. graphic lcd 128x64

FFU touch screen control oled module

1) the central control unit, PLC controller. To achieve the following control functions:
◆ intelligent control module with field bus system using RS485 connection method, the collected field data analysis, processing; achieve on-site equipment control functions. In order to achieve all of the on-site centralized monitoring and control of FFU. 16x2 oled display
◆ communicate with the alarm control unit.
◆ with the man-machine interface unit to communicate.
2) human-machine interface unit, using the touch screen to achieve remote monitoring and adjustment for FFU. To achieve the following control functions:
◆ be able to facilitate the realization of FFU single, multiple, and zone control. That is, an arbitrary number of units can simultaneously control the FFU.
◆ FFU can achieve any number of units start and stop and speed control function, speed control function enables digital, that is, directly enter the desired velocity value (example: 0.25,0.31, etc.) in order to achieve the purpose of speed.
◆ Renyiyitai FFU capable of monitoring wind speed values.
◆ When a fault alarm FFU, can display real-time fault FFU.
3) alarm control unit, using sound and light alarm devices, through communication with the central processing unit, when any one or more FFU fails, the control unit real audible alarm, and with the man-machine interface unit with quickly determine the fault FFU, monitoring personnel to ensure timely processing failure. 5.7 TFT display module

Electrostatic occurred in these places oled module

(A), paper electrostatic hazards occur in the wheel when rewinding and product packing, result in electric shock, product defects and so on.
(Two), electrostatic hazards in finished textiles speed transmission accumulate static result in electric shock, product defect for many, also a result of fire explosion. color lcd display module
(Three), printing, plastics, and rubber industry and other similar types of electrostatic hazards, occurs in the finished roll delivery caused by high static operations, result in electric shock and bad products, electrostatic ink or solvent will result in ignition fire and explosion.
(Four), the petrochemical industry electrostatic hazards occur in fluid transfer, mixing, powder grinding, feeding, screening and other operations, although the frequency of occurrence of hazardous events is low, but if it is an accident hazard disaster occurred mostly very serious consequences.
(Five), power electronics industry electrostatic electrostatic hazards and damage caused by defective products mainly electrostatic hazards in the food industry jobs powder storage tank with alcohol-based jobs. For the process of electrostatic hazards incident to adopt preventive measures, you should first understand the electrostatic hazards occur principle, familiar with the hazards development process electrostatic generation and dissipation factor, and electrostatic discharge types and hazards, be able to identify electrostatic hazards formed at each stage, and then reasons for the use of static electricity can harm measuring instruments for the process of material and environmental measurement, control system Cheng Zhongjing electrical quantities, assess a potential electrostatic hazards, develop and adopt appropriate follow-up of static electricity hazard control methods, while continuing capacity measurement and comparison purposes the effects of electrostatic hazards protective measures can effectively reduce the electrostatic potential hazards, improve the operational safety of the production process and personnel safety. low temperature lcd display

Knowledge about static electricity oled module

I. Introduction Although the earliest electrical electrostatic effect is experimentally proved out, but in the modern industrial system Cheng Zhongjing electricity still be regarded as "undetermined." General industry on the electrostatic hazards prevention techniques can be quite strange, and often takes quite a lot of misunderstanding or misuse prevention methods without realizing that failed to prevent electrostatic damage accident. In most industrial processes in the accumulation of electrostatic charge is generated, ranging from people feel uncomfortable, heavy cause harm to humans, even in the flammable gas, liquid and dust handling and transportation process, resulting in fire and explosion . In particular, with electrostatic potential hazards in certain industries such as: chemical, oil, paint, plastics, pharmaceutical, food, printing and electronics industries, prone to electrostatic hazards arise.
Second, the generation of electrostatic hazards. In the working environment, all fire and explosion due to static electricity incidents have followed the same procedure, as follows: First, charge separation occurs, then the charge accumulation, if the charge can not be dissipated, electrostatic discharge will occur, but may ignite surrounding Yi flammable substances, fire and explosion hazard events occur. Many industrial processes often use very poor conductivity of the material, and often surface contact, separation and movement of the operation, resulting in the phenomenon of charge separation. For example: high resistance value of liquid flow or filtration, powder grinding, mixing or screening process, powder pneumatic transport, personnel or vehicles moving on the floor insulation, conveyor belts or flaky material on the rollers of movement, etc. . In the above or similar process occurs in both static problems. When the charge accumulated on the object to the electric field of the dielectric strength of air 3MV / m when the discharge phenomenon is generated, the whole or part of its stored energy is released to form a discharge path for light and heat, and may ignite explosive substances. According to the minimum ignition of flammable substances energy data can be extrapolated electrostatic discharge energy is sufficient to ignite the flammable substances. OLED Display
Recently, because the parts are many devices using a non-conductive plastic, so that a portion of the device of metal components, components, piping, vessels or structures form an electrical insulator, resulting in the gradual accumulation of charge to a dangerous level. Typical examples include: the plastic piping installation metal funnel, a metal pipe on the road due to certain non-conductive gasket leaving metallic pipe insulation, insulation for wearing shoes or person standing on the floor leaving the body is insulated insulation. Accumulated on the insulated conductor a charge generation discharge, all of the energy will be released in a discharge, such spark discharge is called electrostatic discharge. In general, the spark discharge can ignite flammable gases, vapors and dust clouds. The surface of the insulating charge rate of movement is very slow, however, the duration of ESD extremely short, so the electric charge accumulated in the insulating body, not in one-time release all electrostatic discharge, which may be in the neighborhood of the insulating surface area of ​​occurrence multiple electrostatic discharge. Because the geometry of the charge and the surrounding environment of the different firing patterns can be divided into: corona discharge, brush discharge, as well as radially discharging three. In general, the energy is greater than the brush corona discharge. Brush-like discharge energy sufficient to ignite flammable gases many, solvent vapor and mixtures thereof. As a non-conductive film on both sides full positive and negative electric charges in the accumulation significant amount of charge, if the discharge occurs radially most of its energy is sufficient to ignite the combustible gas and combustible dust. In a large silo or container full of highly charged particles occurs at the surface of the product discharge radial manner, known as bulk powder piled electricity. If flammable gases or has a low minimum ignition energy of dust clouds exist, then there is even a big potential hazards, it is necessary to try to exclude a large powder piled electricity generation. graphic lcd modules

Electrostatic Hazard Control Methods oled module

Electrostatic hazard control methods can be divided into the ground, increase the humidity, the speed limit, antistatic materials, static eliminator with other five. Industrial manufacturing process, due to the operating environment, procedures and different materials, electrostatic hazards implemented control methods will be different. Site selection process must consider the environment, conditions and limitations, and even funding, management systems and quality of human resources and other factors. Without an electrostatic hazard control methods can be applied to all industrial processes or situations, sometimes while using two or more kinds of electrostatic hazard control methods.
(A), grounding electrostatic hazards control methods, the ground is the most effective and economical method. The manufacturing process due to friction, such as induction or conduction means static, if the OLED Display Module charge accumulation in the insulation of metal equipment, products or persons conductive body, the charges accumulated in a discharge energy will be released. Such electrostatic discharge to occur mainly due to electrostatic hazards incident. The control method is to all electrically conductive objects are grounded, and maintain a low resistance to ground, the device will be stored in a metal, a conductive body of the product or charges on personnel quickly dissipated to the earth, in order to avoid accidents of electrostatic hazards. According to the relevant studies have shown that the presence of flammable vapors in the general workplace, insulated metal equipment / components, conductive products or personnel potential of the body itself must reach 100V or more, as may be due to the discharge and ignite surrounding combustible substances. Therefore, the plant will be insulated metal devices / components, a conductive ground the products to keep the ground resistance of less than 106Ω, the charge accumulation is sufficient to rapidly dissipated to the earth, but will itself electrostatic potential drops below 100V, to avoid electrostatic hazards incident occurred. Graphic LCD Display
(Two), increase the humidity to increase operating environment relative humidity of air, in the current manufacturing process of traditional industries is a common electrostatic hazard control methods. In high humidity (RH> 65%) environment, if the surface of the material is hydrophilic, is easily adsorbed moisture in the air, thereby reducing the surface resistance value of the material, increasing the rate of charge dissipation, minimize the degree of the charge accumulation . Such substances include cotton, paper and cellulose acetate. Factories manufacturing process often use humidifiers, watering the ground, or water vapor spray and other methods to increase the operating environment in the air relative humidity. If the non-hydrophilic surface of the material, the easy absorption of moisture in the air, causing not reduce the surface resistance value of the material and therefore can not increase the rate of charge dissipation. Such materials include synthetic polymers such part: ABS (Acrylonitrile-Butadiene-Styrene, Acrylic month Green - butadiene - styrene), Teflon (Teflon, fluorocarbon polymers), etc. Such high water repellent material needs to 80% relative humidity, or 90%, to effectively reduce the surface resistance value of the material, to minimize the degree of the charge accumulation.
(Three), antistatic material substance manufacturing process will be through the accumulation of static electricity dissipation pathways to the earth. If the conductive path is an insulating material (low conductivity) is static dissipation rate, if a conductive material conductive path (high conductivity) the electrostatic dissipation rate. Material surface resistivity less than 1011Ω/m2 or volume resistivity less than 1010Ωm, to avoid excessive accumulation of electrostatic material. Such substances called antistatic material. But containing flammable substances in the workplace, the antistatic material surface resistivity must be less than 108Ω/m2 or volume resistivity must be less than 106Ωm. For industrial processes using a variety of materials, via the following methods to make it antistatic material: the material itself has a static capacity (such as: cotton, wood, paper and soil, etc.) coated on the surface of the insulating material is antistatic material (such as toner, antistatic agents), the insulating material added during manufacturing a conductive or antistatic material (such as toner, a metal, an antistatic agent, a conductive fiber, etc.).