As O- LED display devices become mainstream, design engineers are also under pressure to demonstrate technological advances. Organic light-emitting diode (OLED) devices are gradually entering the mainstream display market. They have the advantages of thin thickness, low power consumption, ability to display high brightness and bright colors, and full color display for any object. Ability.
OLED display principle
An OLED device consists of one or more organic interlayers between metal electrodes, one of which must be transparent. The organic interlayer is a highly disordered amorphous film that typically exhibits different molecular energy levels—the highest energy level (HOMO) that occupies the molecular orbital and the lowest energy level (LUMO) that does not occupy the molecular orbital. The electron-emitting cathode should have a low work function, which limits its energy to a low energy level: good energy matching between the cathode and the LUMO means that there is not much energy loss when emitting electrons.
OLED has the advantages of thin thickness, low power consumption, wide viewing angle, high display brightness and bright colors.
Due to the symmetry of the Fermi level between the two electrical contacts, there is an inherent potential difference between the OLED electrodes at thermal equilibrium and zero bias. HOMO and LUMO are functions of position as the charge moves between the OLED electrodes. When electrons and holes transition from one point to another, they sometimes reach the same position and thus form an excited state, or an excited electron-hole pair. By selecting a suitable material, the excitation of such a large number of electron-hole pairs produces light by emitting photons. The color of the emitted light depends on the particular organic material used.
Type of OLED
Of all the technologies being developed, it may be difficult to distinguish which technologies are really useful. At present, there are two different processes for the practical manufacturing technology of OLED devices: one is to use a polymer organic polymer, and the other is to use a low molecular organic polymer.
High molecular polymer OLED (or PLED) devices can be fabricated using spin coating, photolithography, and final inkjet deposition techniques. Once inkjet deposition and plastic substrate technology mature, PLED display devices will be arbitrarily customizable to meet a variety of size requirements.
Low molecular polymer OLED (or SMOLED) devices can be fabricated using vacuum evaporation techniques. Small organic molecules are packed in several layers on the ITO glass substrate. P LED technology compared to the device based on, not only the manufacturing process SMOLED lower cost, may provide all kinds of display capacity of 262,000 colors, but also has a long working life.
Unlike STN or TFT LCDs, OLEDs are self-illuminating devices that emit light directly instead of blocking light. The self-illuminating nature of OLEDs gives them excellent viewing angle and display characteristics in dark environments. Since each pixel emits light by itself, the OLED does not have any contrast-reducing light leakage through the polarizer formed in the "dark dot" pixel region. OLEDs typically have a contrast ratio greater than 1000:1, and the viewing angle at this contrast is close to ±90°. Since no backlight is required, a relatively thick backlight component is not required, which makes the mechanical thickness of the OLED thinner than that of the LCD. In comparison, the typical contrast of a TFT LCD is approximately 500:1 when measured from the angle of the vertical display plane. Since the LCD relies on the direction of the polarizer to affect the viewing angle, the contrast drops particularly sharply when the viewing angle is away from the vertical angle. The viewing angle of the TFT LCD is defined with a contrast ratio of more than 10:1, which is usually from vertical to about 60°.
OLED characteristics
The self-luminous properties of OLED display devices can be a disadvantage in some cases. Because OLEDs do not control reflected light like LCDs, they become more blurred under direct sunlight. The full color OLED technology currently in use enables its peak brightness to reach approximately 150 cd/m2. When the OLED is used directly under unlit sunlight, the dazzling sunlight makes even the brightest display unrecognizable.
The response time of the LCD is temperature dependent, and its response speed becomes quite slow when the temperature drops below 0 °C. The response time of the OLED is hardly affected by temperature. When the temperature reaches -20 °C, it can still have a response time of less than 10 ns. OLEDs also do not lose display capability at high temperatures like LCDs. Once the LCD reaches a certain temperature, the fluidity of the LC no longer maintains a highly ordered structure and loses its ability to block light.
OLED application
Battery powered applications will directly benefit from OLED technology. Since OLEDs do not require backlighting, they consume less energy than LCDs because most of the energy in the LCD is consumed by the backlight. Since the OLED only illuminates pixels that need to display information, the energy consumed by the OLED is directly affected by the content displayed on the screen. Conversely, when the LCD is turned on, even in areas that do not need to be displayed, the backlight is required to continuously illuminate the entire panel. (small soup)
Domestic communication, 4 g module in addition to support two kinds of LTE FDD LTE/TD - LTE standard, also compatible with 2 g / 3 g down, support td-scdma/WCDMA/EDGE/GP/GSM/CDMA1X/EVDO mode. The data service downstream rate can reach up to 100Mbps, the uplink rate can reach up to 50Mbps, providing customers with high-speed Internet access and wireless data connection and other functions. In addition to providing high-speed data access, it also provides voice, SMS, communication book and other functions, which can be widely used in notebook, tablet, touch screen communication devices, smart phones, video surveillance, multimedia mobile phones and vehicle equipment and other terminal products and vertical applications. Today, I will introduce you to what is 4G module and how to use 4G module.
What is 4G module
4G module said TD-LTE and FDD-LTE and other LTE network standards are collectively referred to. It has the characteristics of fast communication speed, wide network spectrum and flexible communication. 4G module refers to a product whose hardware is loaded to the specified frequency band, software supports the standard LTE protocol, and software and hardware are highly integrated and modular. The hardware integrates radio frequency and baseband on a small PCB board to complete wireless receiving, transmitting and baseband signal processing functions. The software supports voice dialing, SMS sending and receiving, dial-up networking and other functions.
Second, how to use 4G module
The 4G module is usually inserted into the circuit board or the patch module is welded to the circuit board, and the corresponding SIM card is inserted, and the network is connected through the 4G cellular network. In the common transparent transmission mode, data can be directly sent to the target server through the 4G module, and the 4G module can receive data from the server at the same time, and send the data to the serial port, which is received by the serial port device connected to the 4G module. Users do not need to pay special attention to the data conversion process between serial port data and network data packets, only need to insert the module to the target position, simple connection and parameter setting, you can achieve transparent transmission between the serial port and the network end.
What is the 4G module How does the 4G module work
4G module, also known as 4G transmission module, 4G communication module, 4G LTE module. It is a kind of hardware loaded to the specified frequency band, the software supports the standard LTE protocol, and the software and hardware are highly integrated modular products, with good compatibility, fast communication speed, large amount of communication data, wide network spectrum, communication flexibility and other characteristics, widely used in electric power, environmental protection, finance, industrial automation and other fields.
The working principle of 4G module
It has the characteristics of fast communication speed, wide network spectrum and flexible communication. The hardware integrates radio frequency and baseband on a small PCB board to complete wireless receiving, transmitting and baseband signal processing functions. The software supports voice dialing, SMS sending and receiving, dial-up networking and other functions.
Through high-speed networking, the 4G module transmits all terminal business data and equipment operating status to the business center in real time. Through the management monitoring platform, the terminal equipment operating status can be monitored in real time and equipment faults can be timely checked. The efficiency has been greatly improved in many aspects such as operating cost, operation scale and service timeliness. Suitable for shared massage chair, public charging pile, vending machine, vehicle system, environmental monitoring, power remote monitoring and other industries.
4G module refers to a product whose hardware is loaded to the specified frequency band, software supports the standard LTE protocol, and software and hardware are highly integrated and modular. It has the characteristics of fast communication speed, wide network spectrum and flexible communication. The hardware integrates radio frequency and baseband on a small PCB board to complete wireless receiving, transmitting and baseband signal processing functions. The software supports voice dialing, SMS sending and receiving, dial-up networking and other functions. Through high-speed networking, the 4G module transmits all terminal business data and equipment operating status to the business center in real time. Through the management monitoring platform, the terminal equipment operating status can be monitored in real time and equipment faults can be timely checked. The efficiency has been greatly improved in many aspects such as operating cost, operation scale and service timeliness.
Good compatibility
4G module supports FDD LTE/TD-LTE two LTE standards, can also be backward compatible with 2G/3G, support LTE-FDD, LET-TDD, WCDMA, TD-SCDMA, CDMA, GSM and other bands.
Large amount of communication data
4G module downstream rate can reach up to 150Mbps, uplink rate can reach up to 50Mbps, to provide customers with high-speed Internet access and wireless data connection and other functions, suitable for large data transmission applications, such as: remote video surveillance.
High communication speed
The 4G module has a lower ping value than the 2G/3G module, and it takes less time for the module to send data packets to receive the response from the server, which is suitable for applications requiring high response speed, such as remote alarm.
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Shenzhen MovingComm Technology Co., Ltd. , https://www.movingcommiot.com