Vivo Has Introduced a New Screen Fingerprint Touch Technology

(source: shenmonkey digital)In the past two years, we have inadvertently found that new mobile phone technologies are changing at a rapidly changing speed, constantly breaking the traditional model. The screen technology represented by OLED is advancing by leaps and bounds. The birth of OLED screen gave birth to a new technology - screen fingerprint. Screen fingerprint technology has developed rapidly in less than two years. After that, the generation will be renewed every few months. The change of each generation seems to form a tacit understanding. According to what standard is it divided? This is inseparable from vivo, a mobile phone manufacturer.Vivo is the first manufacturer in the mobile phone industry to introduce screen fingerprint unlocking, so that users can experience a faster unlocking mode. Each time vivo launches a representative model, it constantly refreshes the innovation of screen fingerprint. As for vivo, it has become a representative brand and powerful promoter of screen fingerprint. Later, everyone agreed to use vivo's new products, Partition algebra as screen fingerprint.

Vivo Has Introduced a New Screen Fingerprint Touch Technology 1

Vivo's achievements in screen fingerprint technology and how it came all the way should also start from the beginning of this technology. Two years ago, screen fingerprint was the product of a concept machine. People thought it was ahead of schedule and didn't take it seriously. Vivo made its first attempt in 2017. At the 2017 MWC conference, vivo showed the xplay 6 mobile phone, used screen fingerprint for the first time, and used ultrasonic scheme, which triggered a lot of discussion that year.The first attempt of xplay 6 laid the foundation and saw the development of screen fingerprint. No one expected that in January 2018, vivo launched a mass production machine vivo X20 plus UD. This mobile phone uses an OLED screen. Taking advantage of the self luminous characteristics of the OLED screen, it adopts an optical fingerprint identification scheme to project the fingerprint sensor optically onto the screen to unlock. This model is the originator of screen fingerprint, so it is logical that this mobile phone is defined as the first generation of screen fingerprint mobile phone.

Only two months later, in March 2018, vivo launched vivo X21, which is called the second generation screen fingerprint phone. This generation has made improvements in recognition rate and accuracy, and has a higher recognition rate than the previous generation. Because vivo quickly implemented a new unlocking technology in two months, this mobile phone has been sought after and sold more than one million. After vivo X21 was highly praised, other manufacturers began to chase it, and vivo led to the popularization of this technology. Vivo launched the first super high-end flagship machine nex of the new series. Compared with the previous generation, the fingerprint image accuracy of this machine is improved by 50% and the unlocking speed is improved by 10%. It is designated as the third generation screen fingerprint.

The success of the first three generations of screen fingerprint technology has further inspired the development of vivo. In September, vivo launched vivo x23 model. The screen fingerprint has built-in f / 1.5 large aperture to increase the light input and improve the efficiency. In addition, the new photoelectric scheme is used to make the fingerprint imaging clearer. By adding the on-screen fingerprint DSP acceleration technology, the mobile phone can be unlocked in 0.35 seconds. In this way, it has become the benchmark of the fourth generation screen fingerprint technology.At the end of the year, vivo launched a mobile phone with another concept, vivo nex dual screen version. The screen fingerprint of this mobile phone is upgraded from 2p lens to 3P lens, and updated to f / 1.2 super aperture. The light input is increased again, and the identification and unlocking efficiency is further improved, reaching the unlocking speed of 0.29 seconds. DSP hardware acceleration technology was further updated, and the performance was improved by 17%, becoming the fifth generation screen fingerprint. The five generation screen fingerprint five combos in 2018 make vivo synonymous with screen fingerprint unlocking.In 2019, vivo has invested 10 billion in scientific and technological innovation and has also established R & D bases around the world. The rapid improvement of screen fingerprint technology is inseparable from the huge investment and the efforts of the R & D team. At the beginning of the year, the new iqoo sub brand carried the screen fingerprint technology as soon as it appeared. Even the mid-range cost-effective model vivo Z5 also benefited. Users pursuing cost performance can also enjoy this advanced technology.

With the support of strong strength, the sixth generation screen fingerprint HD version was born. On this year's vivo x27, the sensor sensing area has doubled, the finger detection area has increased by 27%, and the image semaphore and dynamic range have increased by 30%. In addition, a simulation scheme is formulated for the actual environment. For example, the recognition rate of dry and wet fingers is increased by 50%, and the recognition rate is also improved in the low-temperature environment of the great enemy of fingerprint unlocking.

Vivo Has Introduced a New Screen Fingerprint Touch Technology 2

From the development of the previous six generations of screen fingerprint, vivo has become the leader of mobile phone screen fingerprint technology in China, which is inseparable from vivo's pursuit of technology and fashion. It has been unremitting in pursuing the pioneer of science and technology, making the screen fingerprint from scratch to mature and stable, showing vivo's spirit of innovation. The two 5g mobile phones iqoo Pro 5g and nex 3 5g launched in the second half of this year use a new generation of screen fingerprint technology, and several new models are waiting to appear later. Along the way, we can look forward to vivo's screen fingerprint technology.

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How Much Would an Ipod Touch 2nd Generation Screen Replacement Cost?
How Much Would an Ipod Touch 2nd Generation Screen Replacement Cost?
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Cob Display Screen Splicing Screen, What Advantages Will It Have
Cob Display Screen Splicing Screen, What Advantages Will It Have
There are several kinds of splicing screens, and LED display screen is one of them. Cob display screen is one of the LED display screen series products. The spliced display screen makes the display screen clearer and more delicate, and the color is softer and more beautiful.What is unacceptable about the splicing screen is the obvious splicing. The existence of splicing will affect the display screen, resulting in the disharmony of the screen and the linear decline of user experience. Therefore, under many materials, the splicing of LED display screen is ideal. If the splicing seam is 0.1 and close to 0, the overall display screen fits perfectly.What are the advantages of cob display splicing, one of the LED display product series?Cob display screen was born when SMD packaging was difficult to drill down with a smaller spacing. One of the characteristics is that the spacing can easily achieve a point spacing smaller than that of LED. Secondly, the packaging method is different. Cob packaging directly encapsulates the light-emitting chip on the PCB board and is bonded with epoxy resin, so that the device is not exposed and has stronger protection. Therefore, the large screen spliced by cob display has the following characteristics:1. The flatness of the screen body is higher and the screen surface is smoother;2. The display screen is clearer, the color is more beautiful, and there is no sense of particles at a close distance;3. Stronger heat dissipation capacity, no heat accumulation;4. The product has stronger protective performance and is not afraid of damage;5. Get rid of point light and area light, and the light quality is better;At present, there are few manufacturers of cob splicing screen, which has high entry requirements and difficult enterprise transformation... And for the same model, the price of cob display screen will be 10-20% higher than that of SMD encapsulated led with small spacing. For questions about cob splicing screen, you can contact the cob splicing screen manufacturer - Shenzhen Dayuan, and we will give you a better reply.fqj
Application of High Performance Optical Film in Automobile Display Screen
Application of High Performance Optical Film in Automobile Display Screen
With the continuous improvement of people's requirements for the lighting and display instruments of automobile instrument panel in terms of brightness, visual effect and energy consumption, in view of the significant advantages of high-performance optical film in adjusting the optical path, it is possible to replace the traditional plastic film for automobile display screen and instrument panel. In this paper, polycarbonate (PC) film with unique surface microstructure is introduced, and its improvement effect on contrast and brightness is verified by experiments.Figure 1 example of automobile display screensummaryAt present, the market demand for the brightness, visual effect and energy consumption of automotive instrument panel lighting and display instruments is increasing. Ordinary transparent or frosted printed grade plastic film has been used to provide the necessary local diffuse reflection effect to mask the bulb and structural details behind the display screen, and allow light to pass through when there is lighting demand. However, sufficient brightness and contrast need to be achieved by increasing additional lighting intensity and appropriate surface texture treatment. At this time, the application of such films may be limited.Figure 2 printed PC film for instrument panelIt is gratifying that in the LCD TV and display application market, the latest development of high-performance optical films has made it possible to extend the adjustment function of such films to some optical paths to the application of automotive display and instrument panel.Generally, the optical function is realized by creating optical microstructure (such as microlens array, semi cylinder or prism array) on the film surface. Such films are particularly suitable for applications where LEDs are used as lighting sources.Figure 3 refraction law: light refraction (N2 = 1 for air)In this paper, two types of films are evaluated: one is the film with microlens array on the surface; The other is a film with random matte texture (as a reference). The film surface is screen printed with a pattern similar to the common instrument panel, which is placed in the backlight module for testing, and then the brightness and contrast of the module are qualitatively and quantitatively evaluated by light intensity measurement method.
The Negative Impact of LED Display Screen, Inventory Some Disadvantages of LED Display Screen
The Negative Impact of LED Display Screen, Inventory Some Disadvantages of LED Display Screen
LED display screen undoubtedly plays an important role in the current urban development. Around our lives, we can almost see the shadow of LED display screen, which brings us a lot of convenience; But everything has two sides. While bringing benefits to us, it will certainly leave a negative impact. Today, Maipu Guangcai will check some disadvantages of some LED displays with you.LED display1. Urban "psoriasis" caused by aging, along with urban development and planning changes caused by urbanization process, some LED displays installed earlier have been unable to adapt to the latest planning and construction. In addition, due to their long service life, there are often adverse reactions such as flower screen and "Caterpillar" phenomenon during operation, which not only affect the viewing and publicity effect, It also has a negative impact on the urban environment. Therefore, this kind of urban "psoriasis" is often the first batch of targets to be cleaned up and rectified.2. The risk of spontaneous combustion of LED screen. For a long time, the safety of outdoor LED display screen has something to do with the rapid expansion of Maipu Guangcai outdoor LED display screen Market in the early stage. The causes of accidents can be basically divided into "natural disaster" and "man-made disaster". The former belongs to line aging and short circuit caused by long-term disrepair and negligent management; The latter is a man-made potential safety hazard in order to save cost.3. In the second and third tier cities, we can often see LED advertising vehicles. In order to make the publicity cover as wide as possible, some manufacturers often choose to transform them into LED advertising vehicles by loading LED display screens and sound amplification equipment for vehicles privately. According to relevant laws and regulations, without the approval of relevant departments, no unit or individual shall set up advertisements on the body of traffic vehicles (except buses) or broadcast outdoor advertisements in the form of loaded electronic screen and audio. Once investigated and punished, they will face the punishment of removing billboards or fines. However, this privately transformed advertising car has not been approved by relevant departments. It often unilaterally pursues volume and brightness for publicity effect. In addition, it drives slowly on the road during the peak period for publicity needs, so it is very easy to bring great road traffic hidden dangers.4. Light pollution, as early as the 1930s, the international astronomical community put forward the concept of light pollution. However, light pollution has not been paid attention to until recent years. More and more outdoor LED advertising displays in cities have inevitably become one of the manufacturers of light pollution. In addition, some led practitioners unilaterally pursue high brightness or use high brightness light sources to cover the defects of products in order to meet the market demand, which intensifies the severity of light pollution to a certain extent.Therefore, when we choose LED display products in the later stage, we should try our best to save energy, environmental protection and safety of the products, and think of the future disassembly when installing them, and install them reasonably according to the environment, so as to avoid future generations from spending a lot of time and energy to deal with them.fqj
The Reference Design of Ti Based Automotive Display Screen of the General Assembly Shiping Is Used f
The Reference Design of Ti Based Automotive Display Screen of the General Assembly Shiping Is Used f
On June 19, 2018, Dalian United holdings, a leading semiconductor component distributor committed to the Asia Pacific market, announced that its Shiping launched a vehicle display reference design based on Texas Instruments (TI) to use low voltage differential signal transmission (LVDS) video solution for automotive information and entertainment applications.The reference design launched by the general assembly of the United Nations and Shiping highlights the multi-point touch with tactile feedback, LCD backlight control and ambient light sense support without reintroducing the dedicated support line into the host processor. This design is realized by two boards. The main electronic circuit board has deserializer, microprocessor, backlight controller, tactile driver and power supply. The LCD interface board is the physical and electronic interface of a specific LCD panel. It is connected through circuit board connectors and provides connection points for LCD panel, touch screen, backlight connection and tactile driver. If you want to use a different display, you may need to design a new LCD interface board.Figure 1 - system scheme diagram of reference design of Ti based vehicle display screen launched by General Assembly ShipingProduct characteristicsWide input voltage range: the power supply voltage outside the battery is 4.5V to 40V;All video and support communications via LVDS;Support 24 bit RGB video;400kbps reverse channel I2C connection for multi touch input;Tactile feedback;The most advanced I2C / SPI interface LED backlight controller, with a dimming ratio of 10000:1, a switching frequency of 2.2MHz, mixed dimming and safety and fault tolerance functions;The backlight can be adjusted according to the input;Ambient light sensor;Thermistor inputs on LCD and backlight realize thermal protection.Figure 2 - product photo of reference design of Ti based vehicle display screen launched by General Assembly ShipingIts step-down converter lm25011-q1 is based on the battery 6V to 40V in the range selected by its input voltage Vin, has 2A output current capacity, and the switching frequency is set to 2MHz to avoid AM band interference and duty cycle close to 100%. The I2C function of MSP430 in the vehicle qualification roadmap with implementation capability is selected.The most advanced I2C / SPI interface led lp8860 backlight controller is adopted, with a dimming ratio of 10000:1 and a switching frequency of 2.2MHz. It can easily support LCD screens above 12-14. It can drive four LED strings, and each string can reach 150mA. It also has the ability to do hybrid dimming, has better light effect, and has safety and fault prompt, which is very important for automotive applications. That is, the drv2667 tactile driver is selected in the vehicle qualification roadmap, and can drive the piezoelectric tactile actuator and vibrate the screen to let the user know where they are, display them on the screen, and keep the driver's eyes on the road.Select ds90uh925q-q1 and ds90uh926q-q1 fpd-link III serializer and deserializer, support 720p content protection, and have two I2S audio channels, 24bit RGB video and 400kbit I2C. It can also have video with adaptive equalizer, jitter and white mode functions.Product applicationHost - after sales;HMI and display - auxiliary display;Host - with remote display;Railway transportation - display screen;Head up display;Instrument panel - high end 8-inch hybrid;Sensor fusion - multi-sensor object / raw data fusion;Instrument cluster - solid state / fully reconfigurable;Audio head unit with remote equipment: display screen, TCU; Integrated HMI, tuner, media interface, wireless device.About general United Holdings:As the largest distributor of semiconductor components in the world and the leading market share in the Asia Pacific region, Dagu holdings is headquartered in Taipei (TSE: 3702). It has Shiping, Pinjia, Quanding and Youshang, with about 5100 employees, more than 250 agent product suppliers, and about 71 ied & 34 non ied distribution sites in the world (43 ied & 34 non ied in the Asia Pacific region), In 2017, the turnover reached US $17.51 billion. (* market ranking based on Gartner data)Da Lianda holdings creates an industrial holding platform, continuously optimizes the front-end marketing and logistics support team, acts as a professional partner in the industrial supply chain, and provides value-added services such as demand creation, turnkey solution, technical support, warehousing logistics and IC e-commerce to meet the needs of original equipment manufacturers (OEMs) and original design manufacturers (ODMs) , electronic manufacturing service providers (EMS) and small and medium-sized enterprises. With international business scale and localized sales channels, it has been deeply rooted in the Asia Pacific market for a long time, and has been selected as the "best IC distributor in Asia" by professional media for many years.In order to improve the localization service quality of the general assembly and meet the differentiated needs of regional customers in Greater China, the six service areas of the general assembly (China) include China based manufacturers, Taiwan based manufacturers, electronic manufacturing service, Japanese based manufacturers and Korean based manufacturers And Hong Kong based manufacturers. In addition to providing customers with the best turnkey solution, the general assembly has specially established a dedicated small quantity service team (SQS) to meet customers' procurement needs of small batch devices. The general assembly has established the General Assembly commerce and trade, the General Assembly commerce and trade (Shenzhen) and the General Assembly Electronics (Hong Kong) in the mainland and Hong Kong respectively. Taking "industry first choice. Channel benchmark" as the corporate vision, the general assembly has fully implemented the core values of "team, integrity, professionalism and efficiency", and achieved mutual benefit and win-win results for suppliers, customers and shareholders with professional services.
Digital Application of LED Creative Display Screen
Digital Application of LED Creative Display Screen
If someone asks, what are the uses of LED creative display, information transmission must be one of them.Recently, the digital application case of LED creative display created by Shenzhen Dayuan, combined with the perfect integration of sound, light and electricity, not only helps customers carry out perfect publicity, but also shows the city's science and technology and future development direction to the people entering the scene from a multi-dimensional perspective. When publicizing their own brand, they do not forget to connect with the times and let people associate modern science and technology, Subconsciously thought: the company that is showing me modern technology.Mechanical LED screen: mechanical dynamic design, arc screen body coordination, high-tech atmosphere is obvious, never close, existing feeling.P1.875 Led creative modeling screen: circular appearance, drawing eyes with special shapes, gathering focus, and bringing different technological feelings at the same time.Led dual screen interaction: the large screen is too high to operate. You can start with the small screen and 0 delay the synchronous operation.Led small spacing display: the ultra-high definition display of the small spacing itself has the characteristics of no graininess when viewed from a close distance. Based on the advantages of high brightness, wide color gamut and good display, it can better convey information to customers.Arc LED display screen, large-area arc LED display screen design, so that the display is more three-dimensional, customers can stay inside, feel more intuitively and understand matters better;Technology and innovation are eternal topics. Only continuous innovation can create better cases. Shenzhen Dayuan has been engaged in the construction of LED creative display screen for more than 10 years: there is no time to connect technology and display, and the display and art fit more perfectly. The multi-dimensional display of the case also caters to this point. lw
Roof Is the Attractive a Part of Home Choose Its Design Properly
Roof Is the Attractive a Part of Home Choose Its Design Properly
To create that excellent wish house actually require certain that the ceiling is done efficiently. A leaking ceiling can damage the tourist attraction of the houses. Therefore making the best choice of roof covering framework parts for your house can matter a great deal. This is the factor which selects whether you are mosting likely to be permanently worried by a leakage susceptible roof covering that has a small life-span and also demands constant interest or is an extremely happy owner of a water resistant, environment immune and also resilient ceiling that asks for lowest maintenance.The choice relies upon on lots of aspects. The typical environment of the area where your building is, the content of present ceiling if existing and also your neighborhood establishing standards as well as scenarios are the crucial issues that you need to care for. Besides it, the other point that is normally in the thoughts of individuals is the existing style and pattern concerning the appearances of Flat Roof Waterproofing framework elements.Roof covering ShinglesNowadays the most preferred and elegant option for content for roofing system shingles is the structure roofing system tiles. It is usually 2 to 3 feet long. It is made of elements like tar, dense really felt, mashed stone as well as various other ideal parts all established with each other into a solitary location. The advantage of these roofing shingles is that they are rather pocketbook friendly. Apart from this, they are also readily available in a great deal of styles as well as shades and also hence you have a great deal of selections to pick from. They can be propounded several usages in addition to a lately developed ceiling or a roofing where old roofing framework parts have been eliminated. They can likewise be put over and over the current roofing tiles.Hire the Right Apartment Roofing System Expert for Your WorkIt is of remarkable importance that you have the appropriate roofer for the task. Establishing flat roofing Bradenton needs a details proficiency. You require to make sure your service provider provides your ceiling with the best parts for your details job and recognizes exactly how to ideal display screen, closure and pressure the ceiling of your developing. Not just are Leaking Flat Roofs a lot more prone to leaking if not efficiently developed, their leaking is likewise harder to recognize. You should be certain you utilize a professional with experience and success with this sort of ceiling. The benefits of maintaining a level roof surface go much past the aesthetic worth it offers an establishing.Probably the simplest advantage of roofing systems flat is exactly how economical these covers can be to establish. A level ceiling prices substantially less to establish both in terms of as well as parts in comparison to various other types of the roof framework. For More Info :- Leaking Flat Roofs.I have AT&T and my phone is messed up right now. I'm not able to see anything on my display screen./?nope there is no way..they do not track...this happend to me last year...take out the battery and there should be a little round sticker and if it is still white there is no water damage and u should be able to call into customer service and get a new, FREE, phone...at least that is what they did with me and the rest of the fam...cuz it happend to everyone with the same phone. .....try to switch to a different carrier, as far as i know none of them have the option to see your texts online but AT&T sucks now a days, service sucks and so do the phones well at least all of the phones that i hadwhat is the best brand and type of case for the iPhone 4s?pass with an otterbox or if you want display screen risk-free practices for the front get a pockets case for the iPhone you open and this is like an iPhone with a pockets very on hand. you will get them of eBay it is what I didCan camerasdisplay screens with window/mirror-like optical behaviour exist?Such a screen may be possible with similar technology to metamaterials which is known for the potential application as an 'invisibility cloak'. Some companies also claim to have achieved this for the military, but its effectiveness is questionable because all the PR around it uses still images and mock-ups.The trick would be to pick up the light from all directions and re-produce that same scatter on the other side (or from the screen). There are ways of making things 'invisible' to some wavelengths using refraction to bend EM waves around a central object, but it's unlikely this would work for an arbitrarily placed 'screen', unless you could capture the input with a bundle of fibre optics and somehow reproduce it exactly at the other end (without 'twisting' of the outbound scatter).All that seems quite hazy and far too under-developed for the practical application you are seeking here. Probably the best you could achieve would be a 3D lenticular screen with head/eye tracking so that it could manipulate the image according to the screen/head relative position. This would only work for one person at a time with current technology, as far as I know. The input would then need to be processed into a 3D scene so that it could be re-displayed from other angles. This technology is reasonably mature and there are many technologies ranging from pure camera-based visible-light capturing with software processing, to active 3D scanning cameras that combine multiple active and passive inputs. Alternatively a tightly packed 2D array of cameras could be used and two suitable ones selected to match the relative head-screen orientation. Their field-of-view would still need to be manipulated according to the head-screen distance, this would most likely be easier to do digitally by cropping and scaling the image from a wide-angle lens
Interpretation of Various Chromaticity Processing Technologies of LED Display Screen
Interpretation of Various Chromaticity Processing Technologies of LED Display Screen
LED display technology from the monochrome display in the early 1980s, to the double primary color display in the late 1980s, and then to the three primary color (full-color) display in the mid-1990s. Until today, we have widely discussed the multi primary color (greater than three primary colors) processing technology in the field of flat panel display. The chromaticity processing technology of LED display screen ranges from the most basic primary color wavelength selection, to the allocation of white field color temperature, to the color space transformation processing to improve the color reduction degree and the chromaticity uniformity processing to improve the image quality. Until today, we have adopted the multi primary color (greater than three primary colors) processing in order to expand the color gamut and reproduce more natural colors. Various color processing technologies run through the development history of LED display screen and become one of the core technologies in the comprehensive discipline of LED display screen.Various color processing technologies1. Selection of primary color wavelengthLED display screen is widely used in all walks of life, and there are different requirements for the primary color wavelength of LED in different application places. Some of the selection of the primary color wavelength of LED is to achieve good visual effect, some is to meet people's habits, and some are the provisions of industry standards, national standards and even international standards. For example, the selection of the primary color wavelength of the green tube in the full-color LED display screen; In the early days, yellow green LEDs with a wavelength of 570nm were widely used. Although the cost was low, the color gamut of the display screen was small, the color reduction degree was poor and the brightness was low. After selecting the pure green tube with the wavelength of 525nm, the color gamut of the display screen is nearly doubled, and the color reduction is greatly improved, which greatly improves the visual effect of the display screen. Another example is the stock market display. People are usually used to using red to indicate the rise of stock prices, green to indicate the decline of stock prices, and $to indicate flat prices. In the transportation industry, the national standard strictly stipulates that the blue-green band indicates passage and the red band is prohibited. Therefore, the selection of primary color wavelength is one of the important links of LED display screen.2. Allocation of white field color coordinatesWhite field color coordinate allocation is one of the most basic technologies of full-color LED display. However, in the mid-1990s, due to the lack of industry standards and basic testing methods, the white field color coordinates were usually determined only by human eyes and feelings, resulting in serious color deviation and randomness of white field color temperature. With the promulgation of industry standards and the completion of testing methods, many manufacturers began to standardize the color matching process of full-color screen. However, due to the lack of theoretical guidance of color matching, some manufacturers often allocate 100 field color coordinates at the expense of the gray level of some primary colors, and the comprehensive performance can not be improved.3. Chroma uniformity treatment.The chromaticity uniformity of LED display screen has always been a major problem perplexing people in the industry. It is generally believed that the uneven brightness of LED can be corrected at a single point to improve the brightness uniformity. The chromaticity unevenness cannot be corrected, and can only be improved by subdividing and screening the LED color coordinates.As people have higher and higher requirements for LED display screen, only subdividing and screening led color coordinates can not meet people's critical eyes. It is feasible to comprehensively correct the display screen and improve the chromaticity uniformity.We find that even the same LED of the first international brand has large wavelength deviation and color saturation deviation, and the deviation range greatly exceeds the threshold of human eyes for green color difference identification. Therefore, it is of great significance to correct the chromaticity uniformity.In CIE1931 chromaticity diagram, according to the law of the center of gravity, we find that the color coordinates of the mixed color can be adjusted to the intersection o of the straight line Cr and the straight line dB when green is mixed with a certain proportion of red and blue at any point within the range of G (& square; ABCD)Although the chromaticity uniformity can be greatly improved. However, the corrected color saturation decreases significantly. At the same time, another premise of using red and blue to correct the uniformity of green chromaticity is that the three red, green and blue LEDs in the same pixel should be centrally distributed as far as possible, so that the color mixing distance of red, green and blue can be as close as possible, so as to achieve better results. At present, the industry usually adopts the LED uniform distribution method, which will bring confusion to the chromaticity uniformity correction. In addition, how to measure the color coordinates of tens of thousands of red, green and blue LED is also an extremely difficult problem. We gave a hint.4. Color restoration processingThe birth of pure blue and green LED makes the full-color LED display popular in the industry with its wide color gamut and high brightness. However, due to the large deviation between the chromaticity coordinates of red, green and blue LED and that of PAL TV (see Table 1), the color restoration degree of LED full-color screen is poor. Especially in the performance of human skin color, there are obvious visual deviations. Therefore, color restoration technology came into being. Here, the author recommends two methods of color restoration:First, the color coordinate space of red, green and blue LED is transformed to make the three primary color coordinates between LED and PAL TV as close as possible, so as to greatly improve the color restoration degree of LED display screen. However, this method greatly reduces the color gamut range of LED display screen and greatly reduces the color saturation of the picture.Second, only the most sensitive skin color gamut of human eyes is properly corrected; The color gamut that is not sensitive to other human eyes should reduce the original color saturation as little as possible. In this way, a balance can be obtained between color reduction and color saturation.5. 3 2 multi primary color chroma processing methodEverything recovers in spring. Under the blue sky, the green grass is green; In autumn, wheat waves roll; Under the sun, it was golden. The colorful nature is so beautiful. Unfortunately, the existing LED display screen can not fully reproduce this beautiful scenery. Although LEDs belong to monochromatic light, each color LED still has a half wave width of about 30 50nm, so its color saturation is limited. It can be seen from Figure 3 that the color saturation of LED full-color screen is seriously insufficient in the large natural color rich $and cyan areas.In recent years, in the field of flat panel display, they are keen to discuss 3 3 multi primary color display (red, green, blue plus yellow, green and purple) to expand the color gamut and reproduce more abundant natural colors. Then, can the LED display realize 3 3 multi primary color display?We know that in the visible light range, yellow and green are monochromatic light. We already have $, cyan LEDs with high saturation. While purple is polychromatic light, single chip purple LED does not exist. Although we can not achieve red, green, blue plus yellow, green and purple 3 3 multi primary color LED display. However, it is feasible to study red, green, blue plus yellow and green 3 2 multi primary color LED displays. Due to the existence of a large number of high saturation colors and Cyans in nature; Therefore, this study is of certain value.In the current TV standards, the video source has only three primary colors of red, green and blue, but no two colors of yellow and green. Then, how to drive the yellow and green primary colors of the display terminal? In fact, when determining the driving intensity of yellow and green primary colors; We follow the following three principles:(1) The purpose of adding yellow and green primary colors is to expand the color gamut and improve the color saturation. The overall brightness value cannot be changed;(2) The hue shall not be changed while increasing the color saturation;(3) Centered on D65; Take the rygcb gamut boundary as the endpoint, and make linear expansion at each point within the gamut range.Under the guidance of the above three principles; According to the law of gravity center, we can find a 3 2 multi primary color chroma processing method. However, in order to truly realize the 3 2 multi primary color full-color screen, we have to overcome the lack of brightness of yellow and cyan LEDs; At present, it is limited to theoretical discussion.To sum up, we mainly discussed three aspects:(1) How to improve the chromaticity uniformity of LED display screen;(2) How to improve the color restoration of LED display screen;(3) How to expand the color gamut and restore more natural colors.When the above chroma processing technologies are implemented, they are interrelated, and in some aspects, even fish and bear's paw can't have both. The integrated LED display screen also needs brightness uniformity correction, gray nonlinear transformation, noise reduction processing, image enhancement processing, dynamic pixel processing, etc. the whole signal processing process is very complex. Therefore, we must comprehensively weigh various performances from the perspective of system, grasp the order of various processing, and increase the depth of signal processing, so as to make the LED full-color display show a colorful and colorful world.
Two Factors Affecting the Display Effect of Industrial Display Screen
Two Factors Affecting the Display Effect of Industrial Display Screen
With the more and more extensive use of industrial display screens, including industrial equipment, handheld equipment, medical equipment, public equipment, etc., industrial display screens are used as the display screens of terminal equipment. Of course, the display screens purchased by terminal manufacturers hope not only to have high reliability but also good display effect, which can also improve the competitiveness of terminal equipment, Today, Xiaobian will talk to you about what factors affect the display effect of industrial display screen?1 Backlight: cold cathode fluorescent (CCF) lamp is the most commonly used backlight in LCD. In the field of industrial application, the quality and service life of CCF backlight will affect the display effect of industrial display. Because the light source will decay with the increase of service time, manufacturers of high-quality industrial display will use high-quality CCF backlight to ensure its long service life and slow down the attenuation process of backlight, So as to ensure that the industrial display screen can maintain good display effect for a long time.2 Perspective: in general, commercial and consumer displays are designed for a single person sitting directly in front of the display. However, in most industrial applications, this kind of use is very rare. For example, the industrial display screen used by large machines will be inconvenient to operate directly in front of the display screen, so the display screen used for industry is usually facing the viewer from different angles. Therefore, the problem of viewing angle will affect the display effect of display equipment. In order to solve this problem, domestic professional industrial display manufacturers will use wide viewing angle display technology to produce, so that the industrial display has a wide viewing angle to meet various viewing needs.It can be seen that the perspective of the display screen and the backlight used will affect the display effect of the industrial display screen. In order to make the display effect of the display screen more excellent and lasting, high-quality industrial display screen manufacturers usually use advanced technology and high-quality accessories. Therefore, when purchasing industrial display screens, terminal manufacturers, It is particularly important to understand the manufacturer's reputation and quality.
Design of Dynamic LED Display Screen Based on a New Multi Bus
Design of Dynamic LED Display Screen Based on a New Multi Bus
1 IntroductionAs a public information display terminal in subway, LED display has a very wide range of civil and commercial value.At present, metro vehicles running in China are generally equipped with LED display screen, but there are few additional functions and single screen display content. In order to cooperate with the use of the new subway passenger information system, we designed a new multi bus LED display dynamic screen.The display not only has a variety of bus interfaces in external communication, but also adopts single bus and I2C bus devices in the design of internal control circuit.There are two kinds of LED screens on the subway: one is placed outside the carriage to display the train operation section, operation direction and current arrival station name, which is compatible in Chinese and English; Other service information can also be displayed according to operation needs; Text display can be static, scroll, pan, waterfall, animation and other effects. The maximum number of characters displayed is 16 16 dot matrix characters 12. The other is the terminal LED display screen, which is placed in the vehicle. The terminal LED display screen can preset the terminal according to the train operation requirements, display the current terminal in real time, and display the current temperature in the vehicle at the same time. The maximum number of characters displayed is 16 16 dot matrix characters 8.2 system compositionThe LED display system screen is composed of single chip microcomputer control unit and display unit. A single display unit can display 16 16. If a certain size LED graphic display system is produced, it can be realized by using several intelligent display units and the method of "building blocks", and the display units in the system are connected by serial communication. In addition to controlling the display unit and transmitting the instructions and signals of the upper computer, the control unit also embeds a single bus digital temperature sensor 18B20. Thanks to the module design of the control circuit, if humidity measurement is also required, 18B20 can be upgraded to the module circuit composed of DS2438 of Dallas company and hih23610 of Honeywell company. In order to meet the communication needs of the whole vehicle, can bus communication is adopted between the upper computer and each control unit in the vehicle.Figure 1 system structure diagram3 hardware designThe display unit is composed of LED display panel and display circuit. The LED display panel is composed of 4 dot matrix modules 64 dot matrix general intelligent display unit, a single display unit can display 4 16 in full screen 16 dot matrix Chinese characters or symbols. The display units in the system are connected by serial communication, so that the work of the whole system is coordinated and unified. The display circuit consists of two 16 pin flat wire ports, two 74h245 three state bus drivers, one 74hc04d six inverter, two 74h138 eight decoders and eight 74HC595 shift latches. The core of the control circuit is the high-speed single chip microcomputer 77e58 of Winbond, the crystal oscillator frequency is 24 MHz. A, and the ROM of t29c020a is 256 K, which is used to store 16 16 dot matrix Chinese character library and 16 8 dot matrix ASCII code table. A t24c020 is an ep2rom based on I2C serial bus, which stores preset statements, such as subway station name, greeting, etc. The temperature in the vehicle is measured by the single bus digital temperature sensor 18B20. SJA1000 and TJA1040 are can bus controller and transceiver respectively.3.1 control circuit unit designThe whole system takes the dynamic single chip microcomputer 77e58 of Winbond as the core. The 77e58 adopts a redesigned microprocessor core, and its instructions are compatible with 51 series. However, because the clock cycle is only 4 cycles, its running speed is generally 2 3 times higher than that of the traditional 8051 at the same clock frequency. Therefore, it solves the frequency requirements of single chip microcomputer in the dynamic display of large capacity Chinese characters, It also comes with its own watchdog. 77e58 controls the flash memory a t29c020 with a size of 256 K through the latch 74l S373. Since the memory capacity is greater than 64 K, the paging addressing method is adopted in the design, that is, P1.1 and P1.2 are used to page select the flash memory, which is divided into 4 pages, and the addressing size of each page is 64 K. P1.5 is used for chip selection of a t29c020, It also ensures that P1.1 and P1.2 will not cause misoperation of a t29c020 when multiplexed on the 16 pin flat cable interface. Can controller is the key part of communication. In order to improve the anti-interference ability, 6n137 high-speed optocoupler is added between CAN controller SJA1000 and can transceiver TJA1040. The single chip microcomputer selects the chip of CAN controller SJA1000 through P3.0. 18b20 is a single bus device. The interface between the device and single chip microcomputer only needs to occupy one I / O port. It can directly convert the temperature into digital signal and output it serially in the form of 9-bit digital code. P1.4 is selected in the control circuit to complete the chip selection and data transmission functions of 18b20. The clock line SCL and bidirectional data line SDA of a t24c020 are connected to P1.6 and p1.7.16 pins of MCU respectively. The cable interface is the interface part of control circuit and display circuit. The hardware connection diagram of the control circuit is shown in Figure 2.Fig. 2 hardware connection diagram of control circuit3.2 display unit connection and controlThe display circuit part is connected with the 16 pin cable port of the control circuit part through the 16 pin cable port (1). The 16 pin cable port (1) transmits the instructions and data of the single chip microcomputer to the LED display circuit. The 16 pin cable (2) is used for the cascade of multiple display screens, and its wiring is basically the same as that of the 16 pin cable port (1), However, it should be noted that the R end is connected to the DS end of the 8th 74h595 from left to right in Figure 2. When cascading, it will be connected in series with the 16 pin flat cable (1) port of the next display screen (as shown in Figure 1). CL K is the clock signal terminal, STR is the row latch terminal, R is the data terminal, G (GND) and loe are the row lighting enable terminals, and a, B, C and D are the row selection terminals. The specific functions of each port are as follows: A, B, C and D are row selection terminals, which are used to control the specific data from the upper computer to the specified row on the display panel, and R is the data terminal to receive the data transmitted by the single chip microcomputer. The working sequence of the LED display unit is as follows: after the CLK clock signal terminal receives a data at the R terminal, the control circuit artificially gives a pulse rising edge, and STR is in one line of data (16 4) After all 64 data are transmitted, a pulse rising edge is given to latch the data; Loe is set to 1 by the single chip microcomputer to light up this line. The schematic diagram of display circuit is shown in Figure 3.Figure 3 shows the circuit schematic diagram4 modular designMetro vehicles have different requirements for LED display screen according to the actual situation, so we have fully considered this when designing the circuit, that is, specific modules can be interchanged under the condition of ensuring that the main function and structure remain unchanged. The structure makes the LED control circuit have good expansibility and ease of use.4.1 temperature and humidity moduleIn the hot and rainy areas in the south, although there is a constant temperature air conditioner in the car, humidity is also an important index concerned by passengers. The temperature and humidity module we designed has the function of measuring temperature and humidity. The temperature module and the temperature and humidity module have the same socket interface, and both are of single bus structure, which are controlled by P1.4 port, so it is very convenient to exchange. Hih3610 is a three terminal integrated humidity sensor with voltage output produced by Honeywell. DS2438 is a 10 bit a / D converter with single bus communication interface. The chip contains a high-resolution digital temperature sensor, which can be used for temperature compensation of humidity sensor. Figure 4 is the schematic diagram of temperature and humidity module.Figure 4 Schematic diagram of temperature and humidity module4.2 485 bus expansion moduleAs a mature and cheap bus, 485 bus has an irreplaceable position in the field of industry and transportation. Therefore, we designed 485 bus expansion module, which can replace the original can module for external communication. The module uses Maxim's photoelectric isolation mxl1535e as 485 transceiver. In order to ensure control compatibility, mxl1535e and SJA1000 are chip selected through P3.0. In addition, 2500vrms electrical isolation is provided between RS2485 side and controller or control logic side through transformer. TVS diode circuit is added to the output part of the module to reduce line surge interference. Jumper can also be used to determine whether to load the terminal resistance of the bus. The schematic diagram is shown in Figure 5.Figure 5 Schematic diagram of 485 bus expansion module5 software designThe system software consists of upper computer management software and unit controller control software. The upper computer management software is developed on the windows22000 operating platform with C build6.0, including display mode selection (including static, flashing, rolling, typing, etc.), rolling direction selection (including up and down rolling and left and right rolling), dynamic display speed adjustment (i.e. text flashing frequency, rolling speed, typing display speed, etc.), Display content input and display preview, etc.When the system is running, the system can not only display the characters such as station announcement and advertisement according to the preset setting, but also manually input the required display characters. The control software of the unit controller is programmed by keil c of 8051 and solidified in the EEPROM of single chip microcomputer 77e58. It mainly completes the functions of upper and lower computer communication, temperature and humidity data acquisition, I / O interface control and so on. During actual operation, the temperature measurement accuracy reaches 0.5 , and the humidity measurement accuracy reaches 2% RH6 Conclusion
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