Design of Control System for LED Large Screen Display

With the advantages of high brightness, low working voltage, low power consumption, miniaturization, long service life, impact resistance, stable performance and flexible configuration, LED large screen display has rapidly grown into the mainstream product of flat panel display and has been widely used in the field of information display.

LED large screen display is mainly composed of dot matrix or pixel array, control system, transmission interface and corresponding application software. As shown in Figure 1, the control system is responsible for receiving, converting and processing various external signals and transmitting the signals to the display screen in a certain law and manner. As the core part of the display screen, the control system directly determines the display effect of the display screen and the performance of the display screen (see Figure 1).

Figure 1 block diagram of control system

Hardware design of control system

There are many implementation schemes of the control system. This design adopts the scheme of single chip microcomputer CPLD (as shown in Figure 2).

Fig. 2 hardware block diagram of control system

The single chip microcomputer mainly realizes communication control. It can not only read out the data in the memory and send it to the PC, but also store the edited information in the memory after processing, so as to facilitate the next processing of the control system. The screen scanning logic uses CPLD as the core. The function of CPLD is to read data from the memory, transmit the data to the screen, and generate control signals at the same time (see Figure 2).

The main CPU adopts AT89C51 single chip microcomputer and expands a 74ls573 to realize the separation of data and address bus for information communication with RAM, and the serial port is connected with PC host computer. MCU circuit is mainly responsible for the initialization of the whole system, the processing of display mode, and the communication with PC. The circuit schematic diagram of the main single chip microcomputer is shown in Figure 3.

Fig. 3 principle circuit of single chip microcomputer

1.2 complex programmable logic device CPLD

CPLD complex programmable logic device is a programmable logic device with rich programmable pins. It can not only realize the functions of conventional logic devices, but also realize the complex and unique timing logic functions. Moreover, it has in system programmable function, which is convenient for system design and field modification, debugging and upgrading of the system. In this design, CPLD is used to realize the timing generation part of the control system, and assist in reading and writing two pieces of auxiliary ram. The structural diagram is shown in Figure 4.

Fig. 4 communication diagram of CPLD

2 design of screen scanning logic

2.1 design idea of screen scanning logic

The driving circuit of LED display screen mainly adopts dynamic scanning display, which lights up the pixels on the LED display screen line by line in a relatively short time period. The dynamic scanning display mode adopts multiple rows (16 rows, i.e. 1 / 16 scanning mode), and the columns with the same name share a set of column drivers.

The line scanning circuit is composed of a decoder and scans the signal line by line. Start from the first row and scan the rows in order. Once the row is gated, the corresponding pixels on the row can be lit by the column drive signal. When the scanning duration of one line ends, the next line is displayed in the same way. In the 1 / 16 scanning mode, after scanning all 16 lines, start the scanning of the next cycle from the first line.

The screen refresh frequency is related to the screen display effect. From the perspective of data update, the higher the scanning clock frequency, the less time left for data update, which is not conducive to system refresh; The lower the scanning clock frequency, the longer the scanning time, which will cause the screen to flash. Generally speaking, the refresh rate cannot be lower than 50Hz (frame rate), otherwise, the screen will flicker.

2.2 program flow of main control circuit

The main function of the main single chip microcomputer is to receive the display data downloaded by the upper computer and provide the display data and various control signals to the screen. The software consists of two parts: the main program and the interrupt service program. The main program is responsible for displaying, reading out the display data as required and generating the required control signals; The interrupt service program solves the problem of communication with the upper computer (see figures 5 and 6).

Fig. 5 control program diagram of main single chip microcomputer

2.3 program design block diagram of CPLD

The programming of CPLD adopts modular programming mode. The whole program consists of data generation module, address decoding module, shift clock generation module, row selection scanning module, column drive register module and so on. The program structure is shown in Figure 6.

Figure 6 modular design block diagram of CPLD

3 conclusion

Design of Control System for LED Large Screen Display 1

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Analysis of the Overall Design Framework of LED Large Screen Display Control System
Analysis of the Overall Design Framework of LED Large Screen Display Control System
introductionThe development of information technology promotes the continuous progress of flat panel display (FPD) technology. New display technologies such as LCD (liquid crystal), PDP (plasma) and LED (light emitting diode) have been widely used in the field of display screen. Among them, LCD (liquid crystal) technology has become the mainstream, with many products and mature market mechanism. Although LCD technology has achieved great success, people still do not stop exploring and studying new technologies. LED display technology is a new technology in recent years. LED technology has attracted more and more attention because of its unique characteristics of high brightness, low power consumption and long service life. Large screen display based on LED technology has been widely used in public places such as squares, airports, sports venues and stations to display multimedia information such as text, animation, image and video on the large screen. When displaying information, the LED large screen control system does not need to process the data by the computer. It directly reads the information stored in the display buffer to display. When the information needs to be updated, the data acquisition module of the display sends new data to the display module. In this paper, a color asynchronous LED large screen display control system is designed by using the technical method of high-speed data storage and processing.1 system design1.1 overall framework of the systemThe overall framework of the LED large screen display control system designed in this paper is shown in Figure 1.Figure 1 structure diagram of LED large screen control systemAs can be seen from the figure, the system mainly includes the following four components:1) The upper computer user control platform is mainly used to compress the image data and modify the display information;2) The screen communication interface part based on arm is used to communicate with the host computer and receive the image data and control signal of the host computer;3) The large screen main controller based on CPLD and arm realizes image gray modulation and reconstruction;4) The large screen display driving circuit provides a constant driving current for the LED tube of the large screen.Figure 2 shows the data flow diagram of the system.Figure 2 data flow diagram of LED large screen control system1.2 system hardware designAt present, there are two mainstream main processors for display control system, one is arm, the other is 89055 produced by ATMEL company. Because arm not only has fast operation speed, but also can process all kinds of digital signals in real time, it is very suitable for the characteristics that the main processor of LED large screen control system needs to move a large amount of data during operation. At the same time, it also leaves plenty of time and space for software programming in the later stage of design. Therefore, we choose arm as the main processor of the system.1.2.1 communication module designIn asynchronous LED large screen control system, different information can be displayed in offline state. Therefore, to realize the real-time update and adjustment of large screen display content is an important link in the design of LED large screen control system. The communication function between LED display and host computer is designed and studied in order to obtain the adjusted display content quickly and reliably. Therefore, the system designed in this paper provides three communication modes, namely Ethernet communication, serial communication and wireless RF communication. These three communication modes not only enhance the performance of communication, but also facilitate the use of users.1.2.2 design of display control moduleThe screen control circuit is an important part of the LED large screen control system. The display control logic circuit generates the read-write control signal and the address to access the display buffer data. The read display data is sent to the LED display through the display driver. The display control module is mainly composed of read / write address generator, counter, read / write address selector, read / write selector, read / write signal generator, shift latch and synchronization controller.To display a complete graphic image on the LED large screen, CPLD and arm must work together to complete the functions of reading and decompressing the graphic image data in the display memory, making the image display effect, gray modulation and generating the driving logic of the display screen. The hardware structure diagram of the display control module is shown in Figure 3.Fig. 3 circuit diagram of LED display main controllerIn the control circuit, the data bus connects CPLD and arm, and S3C44B0X gates the data buffer in CPLD through chip 2, so the base address of arm output data is 0x4000000. ARM first copies the image data saved in FLASH to SDRAM. After related processing, it calls different dynamic display program to write the image data in SDRAM into CPLD buffer, CPLD generates the corresponding timing conversion, and outputs it to LED drive circuit serial.2 software design and implementation of LED large screen control systemConsidering the operating efficiency of the system hardware driver and the software development cycle, the system uses C language as the software development tool.The designed application program should realize the connection function with the display hardware. First, it should communicate with the hardware driver at the bottom of the system. Second, it should provide the user with a control interface and receive various instructions input by the user. Therefore, Visual C is used as the development tool of system application. The communication application program is written using MSComm (Microsoft communications control). MSComm is an ActiveX control for simplified window and serial communication programming provided by Microsoft for users. MSComm control transmits and receives data through the serial port of external devices, which can provide serial communication function for applications. Using MSComm control for serial port programming is very fast and convenient. MSComm control is event driven. In general, it must be notified when an event occurs. In actual programming, you can add your own processing code to the OnComm event processing function. The OnComm event processing function can also check and handle communication errors in the running process of the program. The biggest advantage of OnComm control is that the program response time is very short and the reliability is high. Each MSComm control corresponds to a serial port. If the application needs to access multiple serial ports, use multiple MSComm controls. The behavior of MSComm controls is determined by their various properties. In VC , these attributes can be set through a series of member functions to control the data format, baud rate and other characteristics of the serial port. In addition, in VC , MSComm control appears as a derived class of CWnd class. This window must be created during system initialization, and its properties must be set with member functions to make it use the same communication format as the lower computer, otherwise correct serial communication cannot be established.3 conclusion
What Are the Advantages of LED Large Screen Display and How to Choose It
What Are the Advantages of LED Large Screen Display and How to Choose It
LED large screen display has the advantages of ultra-high brightness and seamless splicing. If the LED spacing is small, the picture will be clearer and more delicate. Moreover, among many material displays, LED display is also relatively environmentally friendly and energy-saving. If there is such a demand, how to choose Shenzhen LED large screen display manufacturers?If there is a demand for LED large screen display, we should know what characteristics these things have in advance. LED large screen display has the following advantages:1. Seamless splicing, large screens are spliced, but the splicing screen has many materials, and the advantage of LED display screen is seamless splicing. If it is LCD splicing screen, the splicing is very obvious, so seamless splicing is one of the advantages of LED display screen;2. Ultra high brightness, if the characteristics of LED display screen are different from other displays, this must be the ultra-high brightness of LED display screen. LED display screen can display normally under direct sunlight, and become the overlord of outdoor display, that is, high brightness; Outdoor displays are generally large screens, so there are certain requirements for brightness. LED display screen is very suitable;3. The size is customized and the shape is changeable. The LED display screen can be made in various sizes, and the shape of the display screen can be flexibly changed according to the different use environment, or the LED special-shaped screen can be customized to attract the requirements of pedestrians with strange appearance;4. Energy saving and environmental protection, the energy consumption of LED large screen display is about 30% lower than that of other displays in the same area; After a rough understanding of the advantages of LED large screen display, how to choose Shenzhen LED large screen display manufacturers?The selection of LED display manufacturers can start with the company scale and cases, which are equal in scale and strength, and the cases are icing on the cake. When there is a project in hand, connect with the manufacturer, conduct field investigation or take the landing site of the project in hand as the root to check the projects connected with the landing site of the LED display manufacturer.Do you understand the simple method of selecting Shenzhen LED large screen display manufacturers? This is a very direct and effective method.fqj
Apple still Uses Cheaper LCD Screens and Decides to Produce Them by Itself, Endangering the Interests of Many Screen Suppliers
Apple still Uses Cheaper LCD Screens and Decides to Produce Them by Itself, Endangering the Interests of Many Screen Suppliers
It is reported that Apple plans to use cheaper LCD screens on most iPhone models next year, while delaying the full conversion to high-tech organic light emitting diode (OLED) screens, which also reflects consumers' price sensitivity.According to the Wall Street Journal, apple is expected to launch an LCD model and two OLED models this fall, and the LCD model is expected to account for most of its iPhone sales. It is expected that Apple will continue to use LCD next year, which is completely inconsistent with the previous report of a complete transition to OLED.Apple announced in March that it was testing its internal microled screen.Apple's decision to insist on using cheaper LCD screens has brought more uncertainty to its screen suppliers; In addition, Apple's decision to produce its own screen endangers the interests of many suppliers.Since apple is not expected to use these products in its OLED screen, the shares of Apple's three LCD suppliers, including sharp, LG display and Japan display, have fallen sharply in the past year. Subsequently, when it was revealed in March that Apple was already testing its microled screen, the shares of many display suppliers, including Samsung, sharp and LG display, fell again. This also damages the interests of general display and Synaptics. After reports showed that Apple would use more LCD screens than expected, the share price of general display company, which provides OLED display materials, began to fall.The Wall Street Journal pointed out that Apple's decision to postpone the implementation of OLED screens does not necessarily bring opportunities for LCD suppliers. For example, LG display has planned to invest in OLED screens.Apple has been facing the problem of supply shortage in the past. If suppliers have to change their production plans, Apple may face supply shortage again. It is reported that Japan display raised $320 million in April to meet the expected demand for its advanced LCD.According to recent reports, Apple has communicated its transformation plan to its suppliers, including plans to reduce parts procurement from suppliers by nearly 20% this year. At the same time, the uncertainty of the continuous expansion of Apple's supply chain will also make the new iPhone more expensive than ever.
Apple still Uses Cheaper LCD Screens and Decides to Produce Them by Itself, Endangering the Interests of Many Screen Suppliers
Apple still Uses Cheaper LCD Screens and Decides to Produce Them by Itself, Endangering the Interests of Many Screen Suppliers
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Will the LED Transparent Screen Become the "Darling" of the LED Screen Market?
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Led transparent screen is a popular subdivision screen in the LED field in recent years. We often see the figure of transparent screen whether it is glass curtain wall, glass window or shopping mall. As one of the high-end display products, the price problem of the original transparent screen makes many users can only wait and see from a distance.With the rapid development of LED transparent screen, its price has also decreased significantly to the acceptable range of users, and various spacing and special-shaped display products emerge in endlessly. Transparent screen is gradually emerging in the commercial display field because of its unique display style.Scientific and technological progress is the core of social development and the first productive force. The transformation and upgrading of science and technology has not only greatly improved the modern production capacity of enterprises, but also further improved human vision in social development. In recent years, with the strong support of the construction industry in big cities, the glass curtain wall area of commercial buildings has reached a new peak. In this regard, led transparent screen manufacturers have made major technical upgrades to the transparent display scheme of large-area glass curtain wall. As a provider of indoor and outdoor LED transparent screen display solutions, Shenzhen Jingang vision is also very happy to contribute to our strength under the mainstream of this market.In order to expand the scope of commercial display application market, we continue to integrate new technologies and introduce various innovative technologies, products and solutions to the market. In recent years, led transparent screen solutions have become more and more common due to the use of advanced technology and most market participation. This popularity has also prompted the outbreak of urban commercial exhibition industry, which is also due to the continuous improvement of infrastructure and the rapid development of urbanization.When it comes to transparent screens, the market segments are relatively broad, and the market segments are based on products, technologies, components, display types, screen sizes and application scenarios. Based on various segments, led transparent screen can help enterprises choose growth niche market and strategic development, and determine the difference between the core application field of products and the target market.
Principle of Touch Screen Capacitance Screen_ What Are the Application Areas of Touch Screen
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Principle of touch screen capacitance screenTouch screen is the most friendly computer user interface at present. It is more and more widely used in consumer electronic products. The touch detection device and touch screen controller are good. The mechanical structure of the detection device is damaged in the process of touch screen device, resulting in the decline of touch accuracy and shortening of service life of the touch screen; In addition, the cost of commonly used capacitive and resistive touch screens is relatively high. Inductive touch screen can avoid damage to the touch detection device during touch and prolong the service life of touch screen products.The working principle of inductive touch screen, as well as the hardware circuit and part of the program design of the controller, all of the controller circuits have passed the verification. The non-direct contact touch of inductive touch screen avoids the damage to the touch detection device, prolongs the service life of the whole touch control system, and the repetition accuracy and touch sensitivity of touching the same point meet the expected design requirements.The capacitive induction touch screen is not affected by dirt, dust or oil stains, but it will be affected by the surrounding environment to varying degrees because it adopts the electric field coupling principle. At the same time, the capacitive induction touch screen has serious drift phenomenon.What are the application areas of touch screenTouch screen has become a hot spot in the market. In the market, shopping malls, hotels and other places, it is still dominated by smart phones. The growth momentum of the smartphone market slowed down and entered a period of gentle development. The application of touch screen outside mobile phones, such as automotive electronics, retail, medical treatment, public facilities, leisure and entertainment, will promote the rapid growth of touch screen market.In addition to applications in large fields, touch screens can be innovated in subdivided fields. In the field of "pen writing tablet", innovate the touch screen.The products have been extended to tablet with pen writing function, e-book, all-in-one machine, electronic whiteboard, etc. And the pen and hand can be used at the same time. When one hand is touching, the pen can also write at the same time.The traditional materials of capacitive touch screen are ITO, metal grid, nano silver wire, carbon nanotube, conductive polymer, graphene, etc. Metal mesh and nano silver wire have more supporters. Both materials are metals (silver or copper) and their conductivity is better than ITO.
Screen Fingerprint Identification Will Be Applied to LCD Screen, Not Just OLED
Screen Fingerprint Identification Will Be Applied to LCD Screen, Not Just OLED
Fingerprint identification on mobile phones has become an indispensable part of our daily life.Especially during the epidemic, face recognition is mostly paralyzed due to wearing masks, and fingerprint recognition has become the current optimal solution.Of course, if you use a mobile phone without fingerprint identification such as iPhone x, you have to find a way by yourself...9to5mac also gave a tutorial on using face ID with mask Screen fingerprint identification has become the mainstream, and the technology is also very mature. However, Tony saw a news while surfing the Internet today, saying that Tianma, a domestic LCD and LCM design company, released the world's first LCD Screen multi-point fingerprint identification scheme (Ted finger print, referred to as TFP).The strength of this scheme is that the off-screen fingerprint identification mobile phones we use now are basically OLED screens, while the LCD screen basically has no on-screen fingerprint identification...One plus 6T off screen fingerprint identification diagram As we all know, the screen fingerprint unlocking needs the illumination of the light source for fingerprint identification, but the LCD screen is relatively thick and has poor light transmittance; Second, the LCD screen cannot emit light actively, and the backlight will interfere with the identification of optical fingerprints.These two problems make LCD basically bid farewell to screen fingerprint recognition.Therefore, mobile phones with LCD screen basically adopt side fingerprint identification, and some will be combined with the power key on the side of the mobile phone.But OLED screens don't have this problem. Because the OLED screen is thinner and more transparent, it is natural to use fingerprints on and off the screen.Then why do manufacturers not directly on the OLED screen, but want to operate madly on the LCD screen? The reason is also simple: because LCD screens are cheap...Although Lu Weibing, vice president of Xiaomi, said publicly some time ago that Hongmi team successfully realized fingerprint recognition under LCD screen on a redmi note8 Pro prototype, so far, no manufacturer has officially announced this technology, and Tianma is the first.So Tony was surprised when he saw the news. This fingerprint identification scheme can be said to break through the two obstacles of current screen fingerprint identification technology - LCD screen and identification area.If the multi-point fingerprint identification in the LCD screen can achieve mass production, it means that the LCD screen can also use fingerprint identification!Another point is the identification area of off screen fingerprint identification.So far, the identification area of screen fingerprint is basically fixed, almost at the lower position of the screen. People will subconsciously put their fingers at the approximate position when unlocking the mobile phone.But no one can guarantee that every time the finger is pressed on the fingerprint identification area, because the identification area is so large, it is inevitable that there will be deviations...The scheme announced by Tianma this time shows that it can make the whole LCD screen recognize fingerprints!Tony mended his brain, that is, I could identify my fingerprint and unlock my mobile phone by placing my finger anywhere on the screen.If this multi-point fingerprint identification technology can be mass produced, the efficiency of unlocking the screen will be much higher than now. You don't have to find the identification area and poke it on the screen.It can be said that Tianma's operation directly makes the LCD screen ride on the head of OLED in fingerprint identification. Once LCD screens didn't even deserve fingerprint identification. Now they not only have fingerprint identification, but also can identify 5 at a time...As for why the multi-point fingerprint solution in the TFP screen can realize these functions, high integration has played a great role.In short, it is to integrate touch, display and fingerprint identification, replace the previous design of fingerprint identification module and reduce the thickness of the screen, so that the screen fingerprint identification is feasible on the LCD.At the same time, in order to realize fingerprint identification on the whole screen, Tianma covers the whole screen with optical path and sensors.As for how multi-point fingerprint identification can play new tricks, it still depends on the subsequent operations of manufacturers.As for the fate of LCD screen after mass production of this scheme, we still don't know, but before that, LCD screen has never been the first choice for mobile phone manufacturers.After all, the OLED screen is thinner, can emit light by itself, and the color is more bright. The experience is much better than that of LCD, but there are still problems of stroboscopic and screen burning, and the price is relatively expensive.When it comes to the LCD screen, the advantages and disadvantages are reversed...The price of iPhone 11 with LCD screen is lower For most users, OLED screen is their first choice, but there are still a group of people who stick to the LCD screen.In addition to having a larger viewing angle, another reason is that they can't accept the strobe of OLED screen. They think it's really hurting their eyes...Therefore, once the TFP scheme realizes mass production, the defect that the LCD screen has no off screen fingerprint will be supplemented. If the price can be controlled well, the current situation of the screen in the mobile phone market may change a lot.However, before that, the mobile phone market was still dominated by OLED screens, not to mention the suoper AMOLED screens such as Samsung. 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What Is the Forming Process of the Flexible Touch Screen
What Is the Forming Process of the Flexible Touch Screen
Every day, new products, new experiences, professional membrane switch proofing factory, 12 hour expedited shipmentFrom the hot sale of Samsung Galaxy edge flagship series to the advent of various curved screen bracelets and TVs, it is no doubt that curved screen technology has been widely valued and sought after by consumers and the industry in recent years. In the future, with the continuous development and improvement of fixed curvature curved screen technology, the flexible touch screen that can realize arbitrary bending will become an important development direction. On the 25th, at the 13th International touch screen and display technology development forum, Huang Hanfeng, deputy general manager of touch R & D from Shenzhen oufeiguang technology, made a detailed introduction to the flexible touch screen from the perspective of the industrial chain around the four key elements of flexible display, flexible touch, flexible cover plate and flexible bonding.Flexible displayFor LCD display, the LCD is usually responsible for controlling the display gray, and the three primary color filters control the display color, which requires them to correspond one by one in order to display normally. If the LCD panel is used as a curved screen, the inner circumference and outer circumference will be unequal, and the original one-to-one corresponding liquid crystal and filter will have position deviation, resulting in color distortion. In addition, it will also cause a series of problems such as light leakage, dark screen ghosting and snowflakes. Therefore, for the curved screen, the OLED display technology represented by AMOLED has almost become the best choice.Huang Hanfeng said that at present, Samsung is the undisputed AMOLED overlord in terms of patents, production capacity, yield and technology accumulation. The sixth generation AMOLED panel that began mass production at the end of 2014 can now produce 50000 pieces per month, and the yield can reach 60%. The second is LG, but LG has been focusing on large screen curved TV. At present, with the increasingly obvious trend of small screen AMOLED, LG is also accelerating the layout of small and medium-sized flexible screens. Although its output is not as good as Samsung, its yield can also reach more than 60%. The latest release of Xiaomi note 2 is the flexible AMOLED screen of LG. In addition, Japan's JDI and sharp (already acquired by Hon Hai), Taiwan's Youda, domestic BOE, Rouyu and other screen manufacturers are also accelerating the layout of their own AMOLED technology. It is the general trend for AMOLED to replace LCD.Flexible touchIn terms of touch control, ITO (indium tin oxide) transparent conductive film has become the most important touch layer material for display screens such as non curved LCD and OLED due to its good light transmittance, low thickness, excellent hardness and conductivity, mature manufacturing technology and many other reasons. However, as ITO itself is a brittle material, it is not suitable for making flexible touch layer with large curvature or even free bending, and the cost and cost are high. At present, it accounts for about 30% - 40% of the cost of the upstream material part of the whole touch screen industry, and uses "indium", a rare metal with limited reserves. Therefore, with the advent of the era of curved surface and flexibility, it is likely to be replaced.Huang Hanfeng said that at present, the main substitutes for ITO materials are graphene, carbon nanotubes, nano silver and metal mesh. Graphene and carbon nanotubes are very good substitutes for ITO from the characteristics of the material itself. However, graphene is still in the R & D stage and is still far from mass production. The industrial mass production technology of carbon nanotubes is not perfect, and the conductivity of the thin film products made of carbon nanotubes is not as good as that of ITO. Therefore, from the perspective of technology and marketization, metal grid and nano silver technology will be the protagonists of development in recent years. Metal grid technology has been applied in some PC display markets.The metal mesh technology mentioned here is a conductive metal mesh formed by pressing metal conductive materials such as silver and copper or oxides on thin film substrates such as pet. Its main advantages are low raw material cost and good folding ability. However, due to the problem of Murray interference ripple caused by yield, output and high-speed pixels, it is more suitable for desktop all-in-one computers, laptops, televisions and other products with low resolution and relatively long-distance use.Nano silver technology means that nano silver ink material is coated on pet or glass substrate, and then laser lithography is used to depict the conductive network of nano silver wire. Its main advantages are high yield, small linewidth, good conductivity and folding resistance, while its disadvantage is high cost. Moreover, compared with metal mesh, nano silver material has smaller radius of curvature and small resistance change rate during bending. In addition, due to the linewidth, it is more suitable for high-resolution close-up scenes such as mobile phones, smart watches and bracelets."By comprehensive comparison, I think nano silver has more advantages than metal grid," Huang Hanfeng said.Flexible cover plateIn order to bend at will, in addition to solving the flexible display and flexible touch, the last and most critical part is the flexible cover plate and fitting. However, due to its hard and fragile characteristics, glass cover plate is not the best choice in the field of flexibility.Huang Hanfeng said that compared with glass, pet and PI (polyimide) materials with high surface hardness and high light transmittance are better choices, but at present, pet and PI also have many problems to be solved. On the one hand, they are not resistant to high temperature and have poor light transmittance: pet and PI will have problems of partial melting and property change at low ambient temperature, and they do not have good light transmittance compared with glass.Secondly, it is difficult to achieve a balance between hardness and folding. Huang Hanfeng said that if you want to meet certain hardness requirements, you need to apply the hardened layer, but after coating the hardened layer, after repeated folding, the hardened layer will crack and reduce the hardness. Therefore, how to achieve a balance between the two is the biggest bottleneck at present.Compared with the flexible cover plate that needs further development, the 3D glass cover plate necessary for curved screen mobile phones has a very good development prospect.Some data show that 2018 may become the outbreak year of 3D glass cover plate. It is expected that the mobile phone penetration rate of 3D glass cover plate will exceed 50% around 2020. With the maturity of 3D glass cover plate processing technology and the decline of unit price, the penetration rate will further improve. It is expected that the market scale will reach more than 19 billion yuan in the future.Huang Hanfeng said that the common manufacturing processes of 1R (single radian bending) and 2R cover plates have been basically mature. They basically achieve a bending effect through hot bending technology. The difference is mainly in the coating of hardened layer. However, the yield is a problem to be solved, which is basically only 30%, and there is no room for improvement in the short term. If 4R is to be done in the future, the yield will be lower. Therefore, the yield is one of the urgent problems to be solved in the manufacture of cover plate.Flexible fitAfter the cover plate is selected, it is fitted, that is, the cover plate is integrated with the touch and display layer below to form a complete module. At present, there are two common methods: roller type and vacuum bonding: the roller has high efficiency and needs to roll the pasted object. The efficiency of vacuum type is relatively low, but it does not need to roll the pasted object, so it is not easy to cause damage to the pasted object.Huang Hanfeng said that if the curvature is large, you can only choose vacuum bonding. However, for the possible 4R bonding in the future, due to its special four side bending characteristics, it is difficult to avoid wrinkles and bubbles in places with large radians even if vacuum is adopted. At present, the industry has adopted customized extrusion airbags or plastic parts to alleviate this problem, but it has not been completely solved. Therefore, the industry still has room for progress in multi surface and high curvature fitting technology.Huang Hanfeng frankly said: "from the perspective of the supply chain, it will take several years for the flexible screen to really realize mass production. At the same time, it also needs the upstream and downstream supply chain to jointly overcome the relevant technical problems."For future development, Huang Hanfeng believes that the integration of various modules will be the general trend. He said: "in the incell technology of LCD, ITO touch film and liquid crystal layer are integrated together, which is a good integration. Now the fingerprint module is independent, and it can also be integrated with touch in the future. I think there will be a process of mutual integration and progress between functional modules in the future."
LG Will Mass Produce Mobile Phone Flexible Screen in the Fourth Quarter of This Year
LG Will Mass Produce Mobile Phone Flexible Screen in the Fourth Quarter of This Year
In the early morning of June 20, Beijing time, according to the English version of Korea Times, in order to further consolidate the leading position in the display market, LG display will mass produce a new version of smart phone flexible display from the fourth quarter of this year and provide it to major customers.LG researchers and technicians said that the purpose of producing flexible display is to meet the growing demand for innovative solutions. LG spokesman Frank Lee said that the company is trying to meet the rapidly growing market demand for advanced display screens. Li stressed that the new display screen is foldable and not fragile, and the product will become a major innovation in display technology.LG said it was investing in flexible displays and high-tech panels for mobile devices, namely OLED panels that support high-definition (UHD) displays. "We have completed the development of the first flexible display and will start mass production from the fourth quarter of this year," LG said in a statementThe E2 production line of the company's display manufacturing plant in pozhou, South Korea, will be responsible for the production of flexible displays. LG said that the OLED flexible display will adopt generation 4.5 glass cutting technology, and the monthly production capacity of the production line will be 12000 pieces.Koo Bon moo, chairman of LG, hopes to revive the enterprise by launching leading products. Therefore, as a major shareholder of LG display, LG Electronics will launch its first flexible display smartphone later this year.LG predicts that flexible display may become the latest trend of mobile devices, so the company may also consider selling flexible display to major mobile device manufacturers.It is reported that LG's competitor Samsung display is also developing similar products. At present, Samsung display is testing flexible display products to improve product quality. Due to manufacturing problems, the upcoming Galaxy note 3 should not be configured with a flexible display in the short term.Kim Yang Jae, an analyst at Woori investment securities in Korea, said: "mobile phone manufacturers are increasingly pursuing bright images, beautiful shapes and thin display screens, while flexible display screens cater to this demand. LG display is expected to help them seize a greater market share." Kim said, LG's strategy of switching to flexible display can break the industry conventions and make the company earn stable profits.In fact, flexible display is only one step for LG to invest in different businesses and seize the global market share of OLED. LG is the first company to mass produce OLED display and foldable OLED screen. At the same time, the company is also developing OLED TV supporting high-definition display.Lim Joo soo, manager of LG OLED Technology Strategy Department, said that in order to remain competitive, LG is trying to reduce costs, reduce power consumption and improve image quality. Lim Joo soo said: "LG display is developing high-definition OLED TV screen. In order to improve the brightness, we plan to replace the existing 'bottom light' technology with 'top light' technology. In addition, the company will develop new materials to extend the service life of OLED display."In the next few years, OLED TV will become the mainstream product, and LG plans to expand the TV screen size to 65 inches and 77 inches. LG said that the above two OLED displays will be produced by the M1 test production line of pozhou factory.
LG Will Mass Produce Mobile Phone Flexible Screen in the Fourth Quarter of This Year
LG Will Mass Produce Mobile Phone Flexible Screen in the Fourth Quarter of This Year
In the early morning of June 20, Beijing time, according to the English version of Korea Times, in order to further consolidate the leading position in the display market, LG display will mass produce a new version of smart phone flexible display from the fourth quarter of this year and provide it to major customers.LG researchers and technicians said that the purpose of producing flexible display is to meet the growing demand for innovative solutions. LG spokesman Frank Lee said that the company is trying to meet the rapidly growing market demand for advanced display screens. Li stressed that the new display screen is foldable and not fragile, and the product will become a major innovation in display technology.LG said it was investing in flexible displays and high-tech panels for mobile devices, namely OLED panels that support high-definition (UHD) displays. "We have completed the development of the first flexible display and will start mass production from the fourth quarter of this year," LG said in a statementThe E2 production line of the company's display manufacturing plant in pozhou, South Korea, will be responsible for the production of flexible displays. LG said that the OLED flexible display will adopt generation 4.5 glass cutting technology, and the monthly production capacity of the production line will be 12000 pieces.Koo Bon moo, chairman of LG, hopes to revive the enterprise by launching leading products. Therefore, as a major shareholder of LG display, LG Electronics will launch its first flexible display smartphone later this year.LG predicts that flexible display may become the latest trend of mobile devices, so the company may also consider selling flexible display to major mobile device manufacturers.It is reported that LG's competitor Samsung display is also developing similar products. At present, Samsung display is testing flexible display products to improve product quality. Due to manufacturing problems, the upcoming Galaxy note 3 should not be configured with a flexible display in the short term.Kim Yang Jae, an analyst at Woori investment securities in Korea, said: "mobile phone manufacturers are increasingly pursuing bright images, beautiful shapes and thin display screens, while flexible display screens cater to this demand. LG display is expected to help them seize a greater market share." Kim said, LG's strategy of switching to flexible display can break the industry conventions and make the company earn stable profits.In fact, flexible display is only one step for LG to invest in different businesses and seize the global market share of OLED. LG is the first company to mass produce OLED display and foldable OLED screen. At the same time, the company is also developing OLED TV supporting high-definition display.Lim Joo soo, manager of LG OLED Technology Strategy Department, said that in order to remain competitive, LG is trying to reduce costs, reduce power consumption and improve image quality. Lim Joo soo said: "LG display is developing high-definition OLED TV screen. In order to improve the brightness, we plan to replace the existing 'bottom light' technology with 'top light' technology. In addition, the company will develop new materials to extend the service life of OLED display."In the next few years, OLED TV will become the mainstream product, and LG plans to expand the TV screen size to 65 inches and 77 inches. LG said that the above two OLED displays will be produced by the M1 test production line of pozhou factory.
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