Four Methods for Prolonging the Service Life of Outdoor LED Display Screen

In midsummer, the weather with high temperature and rainfall gradually increases. Typhoons are frequent, especially thunder and lightning. Outdoor advertising LED display has relatively high requirements for the use environment. Considering that the outdoor LED display may be affected and damaged by high temperature, typhoon, rainstorm and lightning weather, in addition to the need for a comprehensive response plan, what are the precautions for the installation of outdoor LED display in order to improve its service life?

Four Methods for Prolonging the Service Life of Outdoor LED Display Screen 1

1 High temperature protection. The outdoor LED display screen usually has a large area, which consumes a large amount of power in the application process, and the corresponding heat dissipation is also large. In addition, the external temperature is high. If the heat dissipation problem can not be solved in time, it is likely to cause problems such as heating and short circuit of the circuit board. In production, ensure that the display circuit board is in good condition, and try to select the hollow design in the shell design to help heat dissipation. During installation, it is necessary to adhere to the condition of the display screen and good ventilation according to the condition of the device. When necessary, heat dissipation equipment shall be added to the display screen, such as adding an air conditioner or fan to help the display screen heat dissipation.

2 Typhoon prevention. The installation positions and methods of outdoor LED display screens are different, including wall mounted, inlaid, column type, hanging type, etc. Then, in the typhoon season, in order to keep the screen body of outdoor LED display screen from falling, there are strict requirements for the load-bearing steel frame structure of display screen. The engineering unit must design and install in strict accordance with the standard of typhoon resistance level, and also have a certain seismic capacity to ensure that the outdoor LED display will not fall, causing casualties and other hazards.3 Prevent rainstorm. There are many rainy weather in the south, so the LED display screen itself must have a high waterproof protection level in order not to be eroded by rain. In the outdoor use environment, the outdoor LED display shall reach the protection grade of IP65, the module shall be sealed with glue, the waterproof box shall be selected, and the module and the box shall be connected with waterproof rubber ring.4 Lightning protection. The impact of lightning on the display is fatal. If it is struck by lightning, the display will be seriously damaged. Therefore, the outdoor LED display must be installed with lightning rod and lightning protection equipment, grounded, and the distribution box shall be installed on the lightning protection device, and then grounded to protect the safety of the outdoor LED display.

It is suggested that the production, construction and user units should take measures to prevent or reduce the damage of the display screen.

GET IN TOUCH WITH Us
recommended articles
FAQ
Large Outdoor LED Display Screen Is Widely Used. What Are Its Characteristics
Large Outdoor LED Display Screen Is Widely Used. What Are Its Characteristics
Large outdoor LED displays are well known. They are usually used in advertising, traffic information and cultural exchanges. In large and medium-sized cities around the world, various large outdoor LED displays are all over every corner of the city center, and even become a highlight of the city center. Because of the wide application of large outdoor LED display, more and more people are interested in it. Shenzhen LED display manufacturers will share with you the characteristics of outdoor LED display. Let's have a look.1. Large outdoor LED display screen is composed of many single LED beads, and the pixel spacing is usually large. Compared with small spacing LED display, the advantage of large spacing LED is low cost. The cost per square meter of large spacing LED display is much lower than that of small spacing LED display. However, the visual distance from the outdoor large screen is generally far, such as 8m, 10m, etc. when viewing the pictures on the large screen from a distance, there will be no sense of "particles" and the picture quality is clear.2. Wide coverage and wide audience.Large outdoor LED displays are generally installed in higher places, with larger screens and larger viewing angles. Under normal circumstances, the video can still be seen clearly from the angle of 140 degrees in the horizontal direction, which makes the display content of the large LED screen cover a wider range and more viewers. This main function is also one of the reasons why many enterprises are willing to choose outdoor large LED display as advertising content.3. The screen brightness can be adjusted automatically.Large screen LED display installed outdoors will be affected by outdoor weather. For example, the outdoor brightness will be different between sunny and rainy days. If the brightness of the display screen cannot be adjusted automatically, the effect will be different or even greatly reduced under different weather conditions. In order not to affect the viewing effect of the target audience, the outdoor large LED display screen will have the function of automatic brightness adjustment, that is, the brightness of the display screen will be automatically adjusted according to the outdoor weather conditions to achieve the best display effect.4. Easy to maintain.The cost of installing large outdoor LED displays is not low, ranging from hundreds of thousands to millions. Therefore, easy maintenance is very important for large LED displays, which is very important to ensure the long-term stable operation of the display. Generally, large outdoor LED displays can be maintained afterwards. Some displays are maintained by front maintenance, of course, there are also front maintenance and rear maintenance.fqj
Discussion on the Contrast of Outdoor LED Display Screen
Discussion on the Contrast of Outdoor LED Display Screen
introductionDirect looking light emitting diode (LED) technology is the mainstream technology used to realize outdoor digital identification system, but the development of this technology also brings many interesting challenges to measure and evaluate contrast. When people choose suitable devices in a variety of display technologies or multiple display manufacturers for a specific purpose, like several other important display parameters, contrast is also a key consideration.Most people in the display industry agree that few end-users can really understand the impact of image brightness, gamut breadth and fidelity on the contrast of the display. However, the fierce competition in comparison among liquid crystal display (LCD) consumer manufacturers with television as the main consumer goods has not slowed down at all. With the different test methods associated with the variability of test variables, the contrast index published by the manufacturer can appear almost any value. However, the space for the actual change of contrast is limited. At present, dynamic contrast ratio specifications have become more and more common and gradually accepted by people.Not only the consumer display manufacturers, driven by the sales pressure of the consumer display market, the major LED display manufacturers are also facing great competitive pressure in terms of contrast. This is especially true for the outdoor LED display industry, because when selecting products, end users always first consider the contrast technical indicators of the product, even if they may not fully understand the significance of various variables in the test environment and real viewing environment of outdoor display.1. Components of large-size LCDIn order to better talk about the theme of this paper, it is necessary for us to understand the basic unit of large-size LED display screen - LED module. By arranging the modules in the prefabricated frames, then assembling these frames together, and finally coordinating the power consumption and signals between them, a display screen of any size and resolution can be formed.For example, the display screen of the Royal Kansas baseball team is 85 feet wide and 105 feet high. It is composed of 36 parts and 5940 LED modules, with a resolution of 1584 1800 pixels, as shown in Figure 1.Figure 1 the HD display screen located in the major league baseball field is composed of about 6000 LED modulesThe mechanical parameters of the front surface of LED module are the key factors affecting the off state test of display screen. Although the design and manufacture of LED display screens of different companies will vary to some extent, most companies have invested a lot of energy to improve the "video black" state of the display screen from all aspects, as shown in Figure 2.Figure 2 the LED module is equipped with a sunshade, which is often used to improve the contrast of outdoor identification systemIn most LED modules, the light shield is the last part to be installed. This component called "light shield" is a shutter assembly. It is fixed and installed only after the basic module is assembled. This component is very important for the measurement of brightness performance in off state. The name of the light shield comes from its ability to protect the LED panel from sunlight.Generally speaking, the less sunlight directly reflected by the display screen, the higher its total contrast. For most outdoor devices, they are exposed to the sun most of the day, so the manufacturer must strictly design the sunshade to ensure that the display can work normally. The design of the sun visor is also a job to find the best balance between the display contrast and the viewing angle.In addition to the sunshade design of the LED module, the texturing approach of the sunshade surface will also affect how much ambient light will eventually be reflected into the eyes of the observer. Generally speaking, this is related to the processing method. The difference between rough surface and semi smooth surface is that it will more effectively reflect the ambient light in the way of diffuse reflection, which provides a darker off state for the audience, so as to improve the uniformity of the contrast of each viewing angle of the display screen. In contrast, the polishing coating treated in the last process is dim when viewed from the direction of light incidence angle, so it can theoretically enable the manufacturer to provide higher contrast. However, the coating will produce serious glare in the direction of reflection angle, which will affect the effect of side angle viewing.The methods to realize the sunshade design and rough face mask mostly adopt the coating approach. Many but not all LED display manufacturers use anti reflection and anti ultraviolet (UV) black paint to treat the surface of LED module sunshade, trying to further reduce the reflection of light on the surface of LED module. External environmental conditions also have an important impact on the total contrast of the display screen. After the display screen is used for a long time, if it is not cleaned regularly, a large amount of dust and dirt will accumulate. After a certain time limit, it will begin to affect the total contrast of the display screen and gradually turn the "black" state into brown. At present, several methods to clean up dust and dirt have been introduced, and its actual effect remains to be verified. Another challenge for display manufacturers and users is to deal with the impact of ultraviolet light on the front surface of the display. The anti UV coating or plastic on the front surface of the display helps to minimize this impact.Finally, each LED tube will be 1 3mm higher than the surface of the display screen, which will also reduce the contrast performance of the display screen.The intensity of light reflected from each LED has a certain relationship with the LED size and the color of the LED epoxy shell. Each LED contains a reflector for focusing light, and this reflector will also reflect various ambient light entering the LED. Therefore, each LED itself may reduce the overall contrast of the display screen. Fortunately, however, LED manufacturers have adopted the optimized design of only one red LED, one green LED and one blue LED pixel by improving power efficiency and brightness. For the LED display screen produced in the past, according to the design of louvers and the surface texture treatment at that time, each pixel must contain 12, 8, 6 or 4 LEDs to provide sufficient light intensity (as shown in Figure 3). However, the continuous progress of LED technology has greatly improved the contrast of the display screen.Recently, a new operation method in the LED video industry is to use the so-called black LED package to improve the contrast of outdoor light LED video display. Most red, green and blue outdoor light LEDs add more red, green and blue dyes to epoxy resin packaging materials to effectively improve color discrimination and display contrast. The so-called "black encapsulated" LEDs, in short, just add some more dyes to color them, making them slightly darker rather than blackening. Because more coloring dyes are added, the black LED package does maximize the overall display contrast, but at the cost of increasing power consumption and sacrificing display brightness. The difference between standard led and black LED can be seen by comparison in Figure 4.Figure 4 difference between standard LED (upper row) and black LED (lower row)It should be added that all contrast enhancement methods should not only be coordinated in a unified way in the production process of a batch of modules, but also coordinate all modules within an appropriate time range. Some consumer groups will regularly require the coordination and calibration of the module after the display has been used for 5 10 years. The normal working life of LED video display screen is generally 75000 100000 hours. At the end of the service life, the company needs to provide 11 years of support to ensure that the contrast remains unchanged, which needs to be planned at the beginning of each project.2 variables affecting contrastUnderstanding the design of outdoor LED display and how it affects the contrast is of great help to deeply understand the variables that will affect the contrast test of this kind of products. As mentioned earlier, the contrast of outdoor large-size LED video display screen greatly depends on the construction method of the module described previously, including the design of louvers, texturing, coating and led density.In order to make the contrast test meaningful and repeatable, it is necessary to prepare a completely dark darkroom to eliminate the interference of external light. In contrast test, LED module, test instrument and light source are the three key factors of interaction. Most LED display manufacturers will only do a basic on-off test process, and its off state corresponds to video black. However, there is no unified test technical standard in the whole industry. Although there are some legal standards for measuring contrast for some display technologies, such as VESA FPDM (Video Electronic Standards Association flat panel display test), it is not fully applicable to the LED industry. Different from flat panel display measurement, the ambient light source (sun) and measurement tools (viewer) are changing every moment of the day, and the pedestrians driving or walking are also changing every minute. This is difficult to repeat in the test and explain clearly in a product manual.It should also be noted that under the test conditions, compared with the large-size complete LED display screen, it can only be tested on a single module or a collection of modules.In the measured environment, the ambient light is an artificial light source to reproduce the real outdoor viewing environment. Obviously, adjusting the brightness of the light source in the test environment (in Lux) will greatly affect the test results, which can be used to enhance the advantages of product publicity. Since the sunlight on the surface of the display screen itself is changeable, any result can be considered reasonable.At present, in the instructions published by the display manufacturer, the ambient brightness range is 40 50000 lux.The contrast test results can also be improved by adjusting the angle of the light source relative to the display module. As mentioned earlier, the LED module will have horizontal shutters, namely sunshades, distributed between each row of LEDs or each row of pixel points. Increasing the angle of the light source relative to the LED can create a larger shadow area on the module surface, so as to finally improve the black field state of the display screen.Finally, as mentioned earlier, the display manufacturer can also provide convenience for controlling the final contrast parameters by adjusting the angle of the test instrument relative to the display surface. It should be noted again that this may also be the result of the interaction between the light source and the horizontal sunshade.These three basic variable factors - light source intensity, light source angle and test instrument angle - jointly determine the final published LED display contrast. Unless the tests of different displays are unified, it is not appropriate to compare the test results of different products. Therefore, the contrast specification published by the display manufacturer does not have much practical significance (as shown in Figure 5).In the real viewing environment and test environment, the three variables of light source intensity, light source angle and test angle still have a certain correspondence. The condition of the sky has a great influence on the intensity of sunlight on the surface of the display screen. The angle of sunlight on the surface of the display screen at different times of the year and at different times of the day
Analysis of Data Transmission Mode of Outdoor LED Display Screen
Analysis of Data Transmission Mode of Outdoor LED Display Screen
Outdoor LED display is widely used in the release of various live information. Is there a more convenient way to update the display data in real time?As a new information medium, LED display has outstanding advantages in performance. It has long service life, fast response, simple drive and stable performance, so it has been widely used in various fields of society. For example, expressway uses LED display screen to release road condition information in real time; Stadiums and gymnasiums use LED display screen to announce the live situation in real time and so on. How can these real-time information be quickly released to the scene?Figure 1 outdoor LED displayAt present, the data transmission of outdoor LED display can be carried out in the following ways:Staff use portable computers to update data at the equipment site. The disadvantage is that it is difficult to update the display data in real time, find the faults of LED display screen in time, increase the labor intensity of staff and increase the labor cost of enterprise operation.The LED display screen is connected to the Internet through the Ethernet line to communicate with the server-side computer connected to the Internet, and the computer is used to transmit data to the LED display screen through the Internet. This method requires Ethernet cabling, which has the disadvantages of inconvenient installation and expensive maintenance cost.The control of LED display screen is realized through short message. The disadvantage of this data transmission method is that it is difficult to edit short messages and the amount of data transmitted is relatively small. At the same time, the transmission of short message also has a certain time delay, which is difficult to ensure the real-time performance of data, especially in the occasions where real-time information display is required, such as road traffic, stadiums and gymnasiums.The LED display screen is controlled through the mobile communication network. The advantages of this data transmission method are simple installation, fast speed, not limited by time and space, and can update the display data in real time. Therefore, the use of mobile communication network has become an ideal choice.The system for remote control of LED display screen based on GPRS network is shown in the figure. The system consists of LED display screen, GPRS DTU, host computer server software and so on. In this scheme, the only requirement for the LED display controller is that it needs to have RS-232 or RS-485 communication interface.Figure 2 GPRS Remote Control LED display schemeZwg-20ie is a wireless data transmission device (DTU) based on GPRS network, which provides users with high-speed and fully transparent data channel. It is simple to use and stable and reliable. At the same time, zwg-20ie has the design of large buffer area and adopts dynamic partition technology to meet the transmission requirements of different data volumes.Figure 3 zwg-20ie GPRS DTUGPRS wireless data transmission equipment transmits data through the Internet. The upper computer server of LED display screen needs to be connected to the Internet to communicate with GPRS wireless data transmission equipment. The host computer server can connect to the Internet by using static IP or dynamic domain name. If the host computer server of LED display screen is in the LAN, it also needs to do port mapping on the router.In this application, zwg-20ie is the client of network equipment, and the host computer software controlling LED display screen is the server. The host computer software can communicate with the client through standard socket network programming.Figure 4 LED display screen adopts zwg-20ieGenerally speaking, manufacturers producing LED display controller will provide an upper computer software based on RS-232 interface, which communicates with LED display controller through serial port. In view of this, we provide a virtual serial port software to directly virtualize zwg-20ie into a "wireless serial port", Users can use it directly without modifying the existing upper computer software based on RS-232 interface.
DIY Laptop Repair: Do It Yourself and Save
DIY Laptop Repair: Do It Yourself and Save
DIY Laptop Repair- Do It Yourself!Laptop computers are great- they are easy to move and store and they contain all of the required components in one unit. Laptops have the keyboard, trackpad, screen, and computer all in one item. However, this means that there are more pieces that can break and need repair. The portability of a laptop also exposes it to more opportunities to get dropped or damaged.When a laptop stops working, you need to consider how much money it is worth spending to repair it. Sometimes the best option is to do an inexpensive repair yourself. Over the years,, I have made many repairs and adjustments to keep old laptops running.This article will describe some cheap laptop repairs and work-arounds so you can keep using your laptop and avoid buying a new one. Learn cheap ways to handle:Bad laptop hard drive Broken laptop display or laptop screen Broken laptop keyboard Broken laptop trackpad Bad laptop power supply Bad laptop battery Bad Laptop Hard Drive Disaster struck last week. My son called me at work to describe a problem he was having with his laptop computer. He dropped it, and now it was not finding a boot disk. When he turned on the laptop, all he got was a black screen indicating that there was no boot disk. Not good.When I got home, I checked it out. I tried removing the hard drive and plugging it back in. My hope was that the hard drive connector simply came loose. No such luck.I tried running some bootable disk repair tools, but none of the tools could even find the hard drive. You can find bootable disk repair tools for free and make your own bootable disks by burning CD's. You'll need to go into the BIOS settings on the computer that you are repairing and set it to boot from CD by changing the boot options. You can move the CD drive to the top of the boot order in the BIOS menu. Most computers allow you to reach the BIOS menu by pressing F12 during bootup.The fact the bootable disk tools could not even find the hard drive was bad news- the hard drive was toast. I looked around on eBay and amazon and found a used 500GB 2.5 inch SATA hard drive for $40. I decided that it was worth spending $40 to get a 3 year old laptop going again.The good news is that I had backed up the laptop using Windows Backup, so I had an image to load onto the blank replacement hard drive. If you don't have a backup, you'll need to find the Windows installation disks. If you didn't get Windows installation disks, you can contact your computer manufacturer to request them- you may need to pay shipping and handling to get them.When the new hard drive came in the mail yesterday, I used a small phillips screwdriver to remove the broken hard drive. The original hard drive had a metal carrier to hold it in place in the laptop. I unscrewed this from the original hard drive and attached it to the replacement hard drive. Since it was a 2.5 inch SATA drive, it fit right into the space and the connector worked fine. I put the screws in place and now had a blank hard drive ready to format and load with Windows 7 and my son's files from Windows Recovery.I went into the BIOS menu by holding down F12 during boot-up. I set the computer to boot from CD and used a Windows 7 Recovery boot disk. I plugged my external back-up hard drive into the USB port. Using the Windows recovery tools, I found the recovery files for my son's laptop and selected these files to be installed on the blank hard drive. The Windows Recovery Tool formatted the drive in NTFS format and installed Windows 7 and all of the archived files. This process took a couple hours.I was relived to see the computer boot up again in Windows 7! This was well worth $40!Broken Laptop Trackpad or Trackpad Buttons Laptops typically have a built-in trackpad that serves as a mouse to position the cursor on the screen. The trackpad and its buttons get a lot of use and a lot of wear and tear. I had a laptop that I let my kids use for playing games. They actually wore out the left button- it broke off!There are three ways to repair a broken trackpad:1. Replace it. You can order a replacement part and replace it, or have a computer repair shop replace it. This would cost $50 or more at a repair shop. You could do it yourself if you are willing to order the part and disassemble your computer. I decided not to go this route.2. Work around it. This is the option I selected. I used a pair of pliers and wiggled the left button back into place. I then used the Windows control panel to switch the mouse buttons to a "left handed" configuration which uses the left button much less. I was lucky that the left button still works. I was able to work around the issue for free.3. Plug in a mouse or trackpad. You can get a computer mouse or trackpad for about $10 or $15 and plug it into the USB port of your laptop. There are wireless options and products that have a cord. This is not as convenient as using a built-in trackpad, but it is easy to do and doesn't cost much. This can be a good way to keep your laptop going without spending a lot of money to repair the trackpad.Broken Laptop Keyboard The thing about a keyboard is that you really need all of the keys to work to be able to type effectively. I suppose there are some rarely-used keys you can do without, but unfortunately it seems that the commonly-used keys are the ones that break. The space bar gets a lot of use and can wear out. With age, the plastic that laptop keys are made of can get brittle. I once had a space bar crack.Some keyboard issues can be addressed by gluing broken pieces back together, or by snapping pieces that came off back in place.The other class of keyboard issue is if the keyboard is really no longer effective. For example, if you spill something on your keyboard, it can make the keyboard sticky and less responsive. You may want to replace the keyboard in your laptop. Keyboards are usually pretty easy to replace- you can do it yourself for around $50, or have it done for about $100 at a repair shop.As with trackpads, you can also work around a bad laptop keyboard by simply plugging in a USB computer keyboard. You can buy a keyboard for about $15. It is not as convenient as using the built-in laptop keyboard, but if you can work around it easily without spending much money, it may be worth the hassle.Bad Laptop Power Supply There are a couple things that can go wrong with a laptop power supply. One is that the power supply itself can go bad. It no longer produces power and must be replaced. If your battery no longer charges when your laptop is plugged in, first verify that the outlet is working. Plug a light into the same outlet and make sure it turns on. Next, plug the power supply back in and make sure the plug is firmly plugged into your computer. Check that the A/C cord is firmly plugged into the power adapter. If your laptop battery is still not charging, it is probably time for a new laptop power supply.Fortunately laptop power supplies are not very expensive and can be easily replaced. You can get a replacement power supply for about $20.When ordering a replacement laptop power supply, make sure to get adequate power capacity and make sure the plug matches what is used on your laptop. You can look at the label on your power supply to find this information. For example, my Toshiba Satellite takes a 19V supply at 3.95A. The diagram shows that the center pin is positive and outer connector is negative.If you get a replacement power supply that does not have enough capacity or has the wrong pin configuration, it can damage your laptop.Another issue I have encountered with power supplies is that the power connector in the laptop can break off. This can happen due to stress and strain from stretching the power cord while it is plugged into the laptop. One repair shop wanted to replace the motherboard to get a new power connector- very expensive! I ended up taking the laptop to a different repair shop and having them glue the broken piece together. It has held together for 5 years now with no problems.Bad Laptop Battery After a few thousand charge and discharge cycles, a laptop battery will lose most of its capacity. If your laptop can only run for 10 minutes of so without being plugged in, then your battery is nearing the end of its life.I had a battery like this, but decided to keep my laptop plugged in all the time so I wouldn't have to replace the battery. Eventually the laptop would not turn on at all. I was able to order a replacement laptop battery for about $40. Laptop batteries are easy to replace.Broken Laptop Screen Broken laptop screens are bad news. Laptop screens usually cost a couple hundred dollars to repair. If you have an older laptop with a broken screen, it may not be worth replacing.You can work around a broken laptop screen by using an external monitor if you have one available. This can be handy for saving your files from a laptop with a broken screen to a memory stick. You can also use a laptop with an external monitor. This can be a workable situation if you use your laptop at home, however you probably would not want to haul an external monitor with you to a coffee shop...Should I Repair My Laptop or Replace It?It is always worth considering the value you get from spending money to repair an older computer. Looking at laptops for sale on eBay, I would estimate that my son's laptop is worth about $200 when it is in good working order. Buying a new laptop would cost about $350 to $600, depending on the kind of laptop. When I found a hard drive for $40 that would get the old laptop going again, I decided that spending $40 would be a good move. Eventually, something else will go wrong with the laptop, but it may last a long time without spending more money.However, if the repair would have been more expensive, such as replacing the screen for $200, I would have used that money toward a new laptop instead of an expensive repair. It would not make much sense to spend $200 to repair a laptop that would be worth $200 after the repair. Computers depreciate rapidly, and after a few years, the new laptop models begin to look more and more attractive due to their increased speed, processing power, storage capacity, and new features.
6 Quick Tips About Best Fish Finder
6 Quick Tips About Best Fish Finder
The fish finder is a thing with which people can know the location of the fish beneath the water. It is important to take the fish finder when going to catch the fish because in the middle of the sea, you do not know where the fish is.And to know proper information about the fish, you have to choose the best fish finder. But choosing the right one is not that easy. You have to either a techie person or you have to use it before. That is why you need to follow some tips about the best fish finder. Here are some tips about the best fish finder. If you need a suggestion for best fish finder, you can check betafishing.com where you will get an unbiased review of some of the best fish finder.1. Higher Frequency Frequency is the thing with which the fish finder finds the location of the fish. That is why frequency is very much important. And if the fish finder produces high frequency, you will get more information in your screen about the fish. So the best fish finder should produce a high frequency.2. More Power Power is another important thing to consider. Maybe you know power is the thing that controls the strength of the machine. The higher the power, the more the strength. Many people just think about the frequency when buying the fish finder rather than the power. But the thing is that you cannot get the right result unless you have the proper power, no matter how high your frequency is.3. Display screen Once upon a time, people used a black and white screen. But those days are gone. Now when everything is getting digitalized, fish finder comes with a colour display screen. So you should take the colour display screen rather than a black and white screen. And also, you should go for a larger display screen with higher resolution so that you can check the location of the fish more accurately.4. Portability Since you are going to carry the fish finder, it is important for the fish finder to be portable. It should be lightweight and easy to carry. You might go to the middle of the sea to catch fish where a portable fish finder will come to work.5. Scanning Fish finder scans in two way. Either it scans down or side. If you buy the one that scans side, it will not be effective in deep water. And if you go for the other one, that might miss some things. So it is recommended to buy both of them to get the best result.6. Price Always go for the quality. I always say this to people. Some people go for the exclusive one all the time where some people want to save money always. Both are bad. Higher price does not mean good quality and you cannot get the best one at a cheaper price. So it is best to go for the best quality always.Follow these tips and I hope you will get the best one for sure.
Lurking in Apple's Future: Transparent Displays and Styluses?
Lurking in Apple's Future: Transparent Displays and Styluses?
A number of recent patent applications suggest that Apple is exploring technologies that could change the way consumers use its iOS-based devices: styluses and transparent displays.Styluses aren't new by a long shot. Touch screen technology has often been paired with a stylus in the past: Microsoft (MSFT) and its various pen-driven Windows interfaces, Palm with stylus-carrying PDAs, and Wacom (WACMF), which has long made graphics tablets and, more recently, combination tablets and displays, are three vendors that come immediately to mind. Steve Jobs dismissed using a stylus in 2007:If you've ever used a mobile device that needed a stylus, you'd know how annoying it can be to lose it. But it's more likely that Jobs likely wanted to distance the iPhone, with its pure touch interface, from the extensive number of products that had previously used a stylus on a touch-sensitive surface. There are times when a finger tip simply won't do. Trending News LIVE: Tony Awards Deadly Crane Collapse Trophy Hunting Documentary Women's World Cup Even now, Apple already sells third-party styluses as products that "adapt iPhone, iPad, and iPod touch for special needs." Patent applications over the last few months show Apple's developing interests in specialty pen and display combinations. A patent application from January and two more from today show Apple's continued interests in stylus computing. The January application and number 20110162894 from today both focus on a capacitive stylus that would work with the type of touch technology Apple currently uses. Below is a drawing from the application that makes the intended use clear:Although there is massive prior art for using a stylus on a tablet, previous examples generally used resistive technology, in which pressure causes two conductive layers to touch and complete an electric circuit, which identifies the position on the surface.Apple uses capacitive screens, which require a new approach to work, as the first independent claim from the application filed January 2010 and made public today shows:A stylus comprising: a body having a first end and a second end; a tip located at a first end of the body, wherein the tip capacitively couples a user to an input device touched by the tip.The capacitive pen might pass muster as being significant different from previous work in the field, though it may have challenges. (Samsung, for example, has come out with a capacitive touch screen stylus for the Galaxy Tab tablet.) The other application, number 20110164000, is for a communicating stylus that would let the user write on paper, a whiteboard, or some other surface and then display on a screen what had been written.Again, the concept isn't new, but doesn't have to be for Apple to find a particular variant to patent. The more important point is to see the company's potential strategic direction.More intriguing, in terms of what it could mean for device design, is patent application 20110164047 for a transparent electronic display. Again, because the concept and not the breadth of legal protection is of primary interest, here is the abstract:A method and system for displaying images on a transparent display of an electronic device. The display may include one or more display screens as well as a flexible circuit for connecting the display screens with internal circuitry of the electronic device. Furthermore, the display screens may allow for overlaying of images over real world viewable objects, as well as a visible window to be present on an otherwise opaque display screen. Additionally, the display may include active and passive display screens that may be utilized based on images to be displayed.You'd be able to actually see through the screen, like a window capable of displaying images. You can imagine a variety of uses for something like this, such as the following:augmented reality, in which information would display over something you looked at in the real world augmentation of existing video programming without having to go into the video stream itself an actual window in a building that could immediately turn into an electronic display, either for entertainment or for marketing and merchandisingRelated:Relax, Everyone -- Apple's New Multi-Touch Patent Won't Kill Its Smartphone Rivals Apple Wants To Store Your History in the Cloud Apple Invents at Home, Other Tech Companies Need Overseas R&D
Bonehead  Play
Bonehead Play
TOKYO -- Let's say you're an American computer company, and you've just finished design work on a hot new laptop PC equipped with the latest state-of-the-art display screen, a dazzling high-tech wonder known as an "active matrix liquid crystal display." The question arises, where should you manufacture the new computer?Normally, American computer firms like IBM, Apple and Compaq first build new laptop models in their American plants, creating jobs for U.S. workers. But thanks to a world-class blunder by the trade policy technocrats in the Bush administration, that won't happen any more.On Sept. 4 the Commerce Department formally imposed a tough new trade tariff that gives American computer firms a huge financial incentive to move manufacturing jobs overseas.The new import duty was designed to penalize Japanese display screen manufacturers. Japan is the only source of "active matrix" display screens for small computers, and the big firms there have been charged with predatory pricing. But the real penalty will be paid by American computer makers and their employees.The numbers tell the story: The new trade ruling requires a computer firm to pay a duty of 62.67 percent if it imports an active matrix screen from Japan for use in a computer built in an American plant. But if the same Japanese screen is built into a computer overseas, according to the Commerce Department, the import duty is only 3.9 percent.A Compaq official estimated it would cost about $950 in duties to import an active matrix color screen to build into a computer in Compaq's Houston plant. But if Compaq builds the same computer using the same screen at its plant in Singapore, the total import duty for the whole computer, including the screen, would be about $140.In other words, the U.S. government is penalizing U.S. companies some $800 per computer for the crime of manufacturing products at home.Since the laptop and notebook computer market is intensely price competitive, no company can pay a premium like that. Instead, the big U.S. computer firms are all making plans to produce top-of-the-line laptop models overseas from now on.Why would the Bush administration inflict this wound? The answer lies in two words that George Bush is supposed to hate: "Industrial Policy." In classic industrial policy style, the Commerce Department has decided to shore up one U.S. industry at the expense of another.The tough new tariff on imported computer screens was imposed to help a cadre of ambitious American firms working hard to revive the moribund U.S. display screen industry. These high-tech startups -- they have names like "Electro-Plasma Inc." and "MagnaScreen Corp." -- asked the government to penalize Japanese imports so that U.S. makers could compete in the display business.The problem is, no American firm will be able to deliver the display screens computer makers need for two years or more. Since the world market for laptops won't stand still until 1994, U.S. makers have no choice but to buy Japanese displays for their new computers in the meantime. And now, thanks to the U.S. government, they have no choice but to build those computers at foreign plants.The Commerce Department is fully aware of this anomaly. But the tough new tariff was imposed under the anti-dumping law; Commerce officials say that law doesn't permit them to consider potential injury to U.S. consumers or industry when making decisions.This is a tad disingenuous. If there is a law that penalizes U.S. firms for manufacturing their products in U.S. plants, the administration should be trying to change it, not using it as an excuse. The fact is, though, that dumping laws leave bureaucrats an enormous amount of maneuvering room. In this case, the government decided to maneuver things in favor of one industry and against another.The administration's new tariff won't hurt the Japanese. In the fast-growing global market for laptop computers, they will make just as much money shipping display screens somewhere else. The only losers will be the American workers who might have had jobs building laptop computers -- until the Commerce Department stepped in.During the 1988 campaign, Michael Dukakis and his Harvard-MIT economic advisers kept arguing that the U.S. government needed an industrial policy. George Bush kept responding that this couldn't work because bureaucrats, unexposed to market pressures, would make stupid policy choices.Looks like George was right again. The writer is The Post's Tokyo bureau chief.
Apple Dissolves ITunes into New Apps
Apple Dissolves ITunes into New Apps
Apple has announced that iTunes is to be replaced by Apple Music, Apple Podcasts and Apple TV. There had been speculation that the tech giant was planning to shutter the music service it launched in 2001.The firm also revealed a number of new privacy measures at its annual developer conference in San Jose.A new sign-in will be an alternative to logging into apps using social media accounts, hiding the user's email address and data.iTunes will remain unchanged on Windows platforms, and downloads will still be available in a sidebar on the Apple Music app for Macs.The announcements were made at the WWDC conference, where the tech giant outlines its software plans for the months ahead.Apple announced several new privacy measures, building on last year's event where it pledged to jam Facebook's tracking tools."Privacy is a fundamental human right," said Apple's software chief Craig Federighi. He said that there will be an option for apps which request location information to have to ask every time they require it, and they will be blocked from using other markers, such as identifying Wi-Fi or Bluetooth signals.Apple is also launching a sign-in-with-Apple login, as an alternative to logging in to a service using a social media account.Using this login, users can choose to hide their email address, with Apple creating a random alternative address which will forward to the real mailbox."The unveiling of 'Sign-in With Apple' will concern rivals, particularly the web giants," commented Ben Wood from CCS Insight. "Existing sign-in services provide a simple means for single sign-in across the web. Privacy is the differentiator that will be heavily emphasised versus Facebook and Google, and represents a great marketing tool for Apple's broader privacy stance."The next iteration of the iPhone's operating system - iOS 13 - includes a range of changes to its interface, as well as new functions.The new Dark Mode enables iPhone apps to be viewed with a black background, while the Apple Maps app will come with a virtual tour experience similar to Google's Street View.Other key features include the option to silence unknown callers and block senders within the Mail app, improved search in messages, and optimised battery charging.Apple has also made improvements to its language keyboards, including the introduction of new bilingual keyboards and typing predictions for Arabic, Hindi, Thai, Cantonese, Vietnamese and the 22 official Indian languages.Other news from the conference included:The Apple Watch is to become more independent from the iPhone with its own app store.New apps for the Watch include a menstrual cycle tracker, with an optional fertility window predictor, and a noise level tool to alert Watch wearers when they are around noise levels that can damage hearing. Apple said it would not record or store the noise data.The tech giant also unveiled a redesigned Mac Pro complete with a 28-core Intel processor and 6k retina display screen, which is 40% larger than the current iMac display screen.It will launch in the autumn with prices starting at $5,999 (4,700) - this does not include the screen or stand.And instead of buying additional monitors, existing Mac users will now be able to use the iPad as a second screen. Tuong Nguyen, senior principal analyst at Gartner, said this year's event had a different feel to its predecessors, following on from Apple's last announcements which saw it reposition itself as a provider of services, rather than hardware."Typically at WWDC you might see it begin with something interesting, in terms of how devices are used or how apps interact, but this time it kicked off with a video that looked more like a movie trailer," he said."Is this the new way we should see Apple events, more rooted in the media content side of things, rather than the strong emphasis on technology and hardware innovation?"Remember, the last event was all about services and content - this may be the new way that Apple differentiates itself.
Difference Between Interlaced and Progressive Scanning
Difference Between Interlaced and Progressive Scanning
Ongoing technological advances regularly bring forth a revolutionary new technology which tries to replace some old and trusted one. In this post, we note the differences between one such modern-day technology called the progressive scan, and the old and trusted interlaced scan technology. Which will win? Let's find out through an interlaced vs. progressive scanning debate.Though it is believed to be a modern display technology, progressive scanning was first used experimentally back in the 1920s. However, owing to its high bandwidth requirement, increased cost, and complexity of transmission, it was swept under the rug in favor of interlaced scanning. Only in recent years, thanks to the advances in electronics, has this technology finally gained popular acceptance.When I came across a 720p video and a 1080i video, I opened up my big shark mouth and immediately went for the 1080i. Soon however, I found that I had got it wrong. 720p offered similar, if not better quality as compared to the 1080i that I had. The reason why my choice went wrong was in the 'p' and the 'i' of 720p and 1080i, respectively.The 'p' stands for progressive scan, while the 'i' stands for interlaced scan. They are different display technologies used for displaying video on our screens. In the following lines, I shall endeavor to explain the details of these technologies, and try to highlight the points of differences between progressive and interlaced scanning. So let us begin by first understanding how exactly scanning takes place in television.Most TV systems employ display techniques based on the raster scan technique. In it, an image to be displayed is divided into a number of horizontal lines, called 'scan lines'. Each of these lines can be transmitted as analog/digital signals, which are read by the TV system and are individually 'painted' on the screen by it. This painting takes place at a very high rate, called 'refresh rate'. And thanks to our persistence, we can't make out the difference, and observe a continuous and smooth picture.Interlaced scanning is a variant of the raster scan method. It was devised mainly to reduce the bandwidth requirements for the transmission of video signals. In it, similar to raster scan, first, the image is divided into a number of horizontal scan lines. Then, the scan lines are split into odd and even. At any time, only the odd or the even lines are transmitted over the broadcast network.Thus, at the receiver's end, that is, on the TV screen, only odd or even scan lines are painted at a time. However, this is done at a very high rate. Typically, after the odd lines are painted, the even lines follow in about 1/60 of a second. Thus, effectively, complete image frames (both even and odd) appear approximately 30 times on the screen every second. Persistence of vision prevents us from noticing this procedure, and we feel like it is an entire picture that is painted on the screen. Interlaced scanning displays only half the image at a time, effectively reducing the bandwidth requirement by a factor of 2. This greatly reduces the complexity of the entire broadcasting and display system. At a fixed bandwidth, interlaced scanning has twice the refresh rate as compared to progressive scanning. This helps when viewing objects in motion, as interlacing updates their position on the screen more often. Thanks to reduced cost and complexity, TV broadcast systems based on interlacing became popular over the years, and are the most widely used systems at present. When viewing very high speed motion sequences, if the object is moving fast enough to be at different places in the time it takes for both the odd and even lines to be painted on the screen, a disturbing motion artifact will result. An example of this is when you watch the ball during a tennis match on a TV system implementing the interlaced video technology. An intentional blur is sometimes introduced to remedy the motion artifact produced in interlaced scanning. Though this helps, it also takes away the clarity of the display. Interlaced scanning is unsuitable for computer screens, especially while displaying text. Modern LCD and LED TVs don't use raster scans, and therefore, cannot benefit from the use of interlacing. With the increasing popularity of such displays, it is likely that interlacing will become obsolete within the next 20 years.Progressive scanning is a more modern display technology. In it, all the horizontal scan lines are transmitted together, and are painted on the display screen at the same time. Therefore, complete images appear on the screen typically every 1/60 of a second. This gives the viewer the sense of a more clearer and natural display. The displays implemented using interlaced scanning are free from motion artifacts, as complete images appear on the screen every time. The video being displayed also doesn't require the introduction of an artificial blur. Each frame is a complete picture. Thus, it doesn't suffer from an interlacing artifact. As such, the frames can individually be captured as still photos. Progressive scan is the natural technology of choice for computer screens. It displays text much more clearly, and causes less strain to the eyes on prolonged use. Thanks to the better sharpness, higher contrast ratio, realistic picture representation, and overall high quality of displays using progressive scanning, they are becoming more and more popular in recent times. The broadcasting of signals generated using progressive scanning requires a large bandwidth, making the entire system more costly and complex. This is the primary reason why this technology hasn't become mainstream yet. Most modern displays use progressive scan. However, the broadcasters still send out signals in the interlaced format. Therefore, a process called deinterlacing has to be used to convert the interlaced signal into the non-interlaced video at the receiving end. Deinterlacing tries to combine two separate fields to make a single frame, which usually doesn't give very consistent results. Often, this process introduces a number of visual defects in the video that it outputs.From this discussion, it is clear that progressive scan is better than interlaced scan. It offers a more vivid and realistic display, which appeals to one and all. With the advent of modern displays such as LCDs and LEDs, this display technology is here to stay. Though interlaced scanning still reigns supreme in the broadcasting industry, continuous technological advances and falling prices of the associated electronic devices all indicate that systems based on progressive scanning will most certainly dethrone those based on interlaced scanning in the near future.
How to Choose and Display Screen LED Display Screen
How to Choose and Display Screen LED Display Screen
By BARRY FOX For over 30 years, Barry Fox has trawled through the world's weird and wonderful patent applications, uncovering the most exciting, bizarre or even terrifying new ideas. His column, Invention, is exclusively online. Scroll down for a roundup of previous Invention articles.We could soon see a new kind of display screen from computer maker Apple - one that simultaneously takes pictures while showing images.The clever idea is to insert thousands of microscopic image sensors in-between the liquid crystal display cells in the screen. Each sensor captures its own small image, but software stitches these together to create a single, larger picture.A large LCD screen filled with image sensors would be ideal for videoconferencing, Apple suggests, as participants would always appear to look straight into the "camera". The technique could also add a camera function to a cellphone or PDA without wasting space, and light from the screen should help illuminate a subject. The more sensors there are, the wider and clearer the image. Sketches accompanying the company's patent show as many sensors as liquid crystal cells in a screen. If some of the sensors have different focal lengths, switching between them would make the screen behave like a zoom lens.Read the full patent, here.This could be bad news for under-age drinkers and anyone else trying to lie about their age.Camera maker Kodak is adapting the technology used to automatically correct flash-induced "red-eye" in digital images to determine a person's age. A patent filed by researchers from the company's labs in Rochester, New York, suggests the technique could provide a quick and easy way to check someone's date of birth.Red-eye is the effect seen when a person's open pupils allow a camera's flash light to be reflected off their retinas. Red eye correction software analyses a picture, looking for a pair of red dots in the centre of a face, and automatically dulls them to remove the effect. Kodak's patent mentions previous research suggesting a correlation between age and the way pupils react to light. As a person gets older, their pupils have greater difficulty widening to cope with dim light, it says.The company suggests that an age-verification system could take mug shots of a person from a set distance in controlled lighting, using a flash. Software would then measure the size of their red-eye dots to determine how wide their pupils are and make an estimate of their age. Although the patent doesn't say how accurate the system could be it suggests that accuracy could be boosted by automatically looking for wrinkles and grey hair in an image as well. Well, just don't point that thing at me...Read the full patent, here.Researchers from the US National Institutes of Health are working on a safer early-warning system for breast cancer. The new system would use broadcast frequency radiation instead of X-rays to detect tumours, allowing women to undergo frequent checks without exposure to hazardous ionising radiation.An array of up to a hundred mini-antennae would be built into a soft, breast-shaped sensing device. Each antenna would emit a very short burst of microwave energy, rapidly scanning across several frequencies, at just one-hundredth of the power output of an ordinary cellphone. Malignant tissue is far less conductive that normal flesh, and so should reflect much more signal back to detectors built into the same device. Software would remove random reflections from the skin surface and the patent claims that tumours as small as 1 millimetre across would show up using the scanner.Although the power is low and safe, the signal should be able to penetrate 10 cm of tissue, to reveal deeply hidden menaces. The scan should also take just one-tenth of second.Read the full patent, here.
no data
Contact US

    Bao’an District  Shenzhen City, China

     +86 189 3806 5764

NEWSLETTER SUBSCRIBE
no data
Copyright © 2021 CrowBerry

   

chat online
NEED HELP? WE'RE HERE!