Vehicle Navigational Systems and Display Screen Sizes?

1. All the companies that make GPS units for both the car and the independents all use the same mapping systems..... 2. The Garmin Streetpilot 7200 has a 7-inch screen and runs between $500.00 to $1100.00 dollars. 3. The Kenwood DNX7100 has a 7-inch screen but it runs between $899.99 to $1,399.99 depending on which store you buy it from.

Vehicle Navigational Systems and Display Screen Sizes? 1

1. Is there anywhere I can get dual display screen savers for 100% free?

The Radar Screensaver is a present day and outstanding screensaver which, is in a position to reveal your computer screen right into a demonstrate screen of the stunning radar watching the skies, seas, and close to-Earth area. once you've 2 or extra computer screen instruments linked on your pc, you would be in a position to configure it to reveal similar or diverse circumstances on diverse reflects. this can turn your workplace into something like genuine airspace statement submit.

2. what would make your computer freeze up and display a screen with lines on it?

A virus or spyware. It could also be drivers for your video card. If that does not help try using AVG Anti-Virus, Spybot S&D and Ad-Aware to remove any viruses or spyware you may have. Good luck!

Vehicle Navigational Systems and Display Screen Sizes? 2

3. Can no display on the screen mean a dead CMOS battery?

It's not the battery. If the battery was dead it would not stop the computer booting up. It just would not save the BIOS settings so they would revert to default everytime you restart the computer. If even the on-board graphics are not working then there is something else causing the problem. Disconnect everything from the motherboard except the memory and processor. Then re-seat the memory (remove it and plug it back in to make sure its in properly blow away any dust that has built up). Next connect the screen to the on-board graphics and turn the computer on. If you get absolutely no output on the then there is a good chance the motherboard has had it. If you do get some output and the computer starts to boot, turn it off and re-connect things like disk drives and cards one by one to find out what was causing the problem. Either way a new CMOS battery is not the answer.

4. what is the best case to protect my display screen on my droid?

The Otterbox Defender for the Incredible 2 will be the most durable case for a variety of reasons. -It has a built-in screen protector so your screen has an extra layer of protection from not only scratches but the impact of drops as well. -The shell is made of a polycarbonate plastic that is extremely strong, durable, and lightweight. -It has an extra layer of silicon molded around the outside for extra impact protection. I've had several people tell me they've ran their otterbox over with a car and the phone was still okay. I've also had a firefighter tell me he ran his over with a firetruck and it still survived. Those things are heavy! Finally, I had someone who ran theirs over with a crane and they claimed the phone still functioned despite the screen breaking and otter case breaking. So basically a crane may be the limit. Also, the Otterbox case comes with a one year manufacturor's warranty. Go to Otterbox.com to order one! The commuter series is good too but it wo not be as protective as the defender series. Regards

5. can't get to the display screen of my cell phone?

Have you recently gotten your phone wet?... either way yes, when I worked for Verizon Wireless, our first step of troubleshooting would be to take out the battery for about 1 minute, then try to power it on if that does not work, you should call your provider, from verizon that is 611 from ur phone. but again it sounds like it might have gotten wet, not necessarily dropping in water, if you have it in the bathroom while you shower it can get condensation in it, or if it is by the sink when running water it can get splashed. Good luck

6. What can I use to clean my laptop display screen?

microfiber cloth LCD cleaning solution.

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FAQ
Display/Screen Problems with Samsung Laptop
Display/Screen Problems with Samsung Laptop
Hello everyone!I am desesperate because I dropped my laptop a few days ago and the screen is acting crazy, I really need help!!Here are links to some pictures of how it looks like right now.For some reason, the whole screen is "zoomed" in, so everything is expanded, larger and moved up. Also, because of this enlargement, the whole screen is moved and I can not see the right side anymore (like as it was cut).There also is a thick white line under the desktop. For some reason, under the white line, the upper part of the desktop appears too.The whole screen has some kind of blue/yellow/pink/white tone over it, it keeps changing when I turn it on, and since today, when I close the screen it goes back to normal color but after the screen turns off because of not using it for a few minutes, it turns into those blue/yellow/pink or white tones again.I've tried many things already: changing the screen resolution, switching to the other graphic card, changing the graphic card controls, updating the graphic cards, etc, etc but nothing works...I am currently living in Japan for a few months and I tried calling to a few places to let it be fixed but as soons as they hear that it is Samsung, they tell me they will not repair it. I called Samsung Japan and they say they can not fix things I did not buy here, and I called Samsung Germany (that's where I bought it) to ask them but they say that they can not do anything if I do not come to Germany, since they would not even ship it back internationally...I really really need this laptop and buying a new one is not an option....The model of my laptop is Samsung Serie 5 NP550P7C-T0ADE Notebook 17,3":-17,3" mattes HD Display with LED-Backgroundlighting 1600 x 900 dpi-Graphics: NVIDIA GeForce GT 630M with 2048 MB (Optimus Technology)Please, If anyone has any ideas about what else I could try out, I will apreciate it a lot!!Thank you!How much cost to repair Apple iPhone 4 display screen in India?The cost to repair your Apple iPhone 4 screen totally depends on which method you choose to fix it up. Few of the methods are like getting it fixed from authorized Apple service center or getting it fixed by a local repair shop in your area or to do it yourself. * The 1st option is to go to authorized Apple service center. They will charge a hefty amount on the same, but this will ensure 100% genuine replacement screen with warranty. Means this is the only method to ensure that you will get 100% genuine original screen and will get some limited time warranty on the part. * The 2nd option is to go to some local mobile repair shop in your area, where you can get your Apple iPhone 4 repaired for a better price deal but this wo not ensure good quality part and an unreliable warranty. Just make sure that you do not get fooled by a shop who claims to have a original screen for a higher price. Do you really think he can have tie ups with Apple and get original genuine parts from them? The only way these shops can have a original screen is if they took out the screen from some other phone. Do It Yourself * The 3rd and the best option is to get a high quality replacement LCD Screen with Touch Digitizer for your Apple iPhone 4 from a reliable online store (like maxbhi.com) and get it fitted from the local repair shop for just 200-300 Rs. This way you will get a good quality display screen with good prices and a reliable warranty. You can even try to do this yourself with the help of youtube videos and phone opening toolkit for Apple iPhone 4. As per our research, Apple iPhone 4 screen replacement should cost something around 700 Rupees in India.How much cost to repair Apple iPhone 6 display screen in India?The cost to repair your Apple iPhone 6 screen totally depends on which method you choose to fix it up. Few of the methods are like getting it fixed from authorized Apple service center or getting it fixed by a local repair shop in your area or to do it yourself. * The 1st option is to go to authorized Apple service center. They will charge a hefty amount on the same, but this will ensure 100% genuine replacement screen with warranty. Means this is the only method to ensure that you will get 100% genuine original screen and will get some limited time warranty on the part. * The 2nd option is to go to some local mobile repair shop in your area, where you can get your Apple iPhone 6 repaired for a better price deal but this wo not ensure good quality part and an unreliable warranty. Just make sure that you do not get fooled by a shop who claims to have a original screen for a higher price. Do you really think he can have tie ups with Apple and get original genuine parts from them? The only way these shops can have a original screen is if they took out the screen from some other phone. Do It Yourself * The 3rd and the best option is to get a high quality replacement LCD Screen with Touch Digitizer for your Apple iPhone 6 from a reliable online store (like maxbhi.com) and get it fitted from the local repair shop for just 200-300 Rs. This way you will get a good quality display screen with good prices and a reliable warranty. You can even try to do this yourself with the help of youtube videos and phone opening toolkit for Apple iPhone 6. As per our research, Apple iPhone 6 screen replacement should cost something around 1500 Rupees in India.
Design Scheme of Ambient Light Adaptive LED Display Screen of Msp430f169
Design Scheme of Ambient Light Adaptive LED Display Screen of Msp430f169
This design mainly realizes that the brightness of LED display screen changes with the ambient light, so as to avoid unclear display during the day or dazzling at night; And communicate with the host computer. The system is composed of msp430f169 single chip microcomputer, 16 * 32 common anode LED dot matrix display screen, row driving circuit, column driving circuit, ambient light adaptive circuit, digital switch voltage regulating circuit, DC voltage stabilizing source circuit, etc. The display of LED dot matrix screen is realized by sending data in parallel by column and scanning by row; The single chip microcomputer realizes the automatic adjustment of the power supply voltage of the LED dot matrix screen through the digital switch voltage regulating circuit, so that the screen brightness changes automatically with the ambient light.LED dot matrix display is very common in life, which has brought a lot of convenience to our life. Because the LED display brightness cannot change with the external ambient light, there is a problem of unclear display during the day or dazzling at night. If its brightness can be controlled, it can not only save energy, but also make the display effect of the display more clear. This design introduces the ambient light adaptive LED display screen controlled by msp430f169 single chip microcomputer system. The screen can automatically adjust the brightness according to the intensity of ambient light, so as to avoid unclear display in the day or dazzling at night, and communicate with the host computer. LED display has a wide range of applications, such as shopping malls, entertainment places, factories, schools and other large places. The research on LED display has practical value and good development prospects.1 system structure block diagramThe system is mainly composed of msp430f169 single chip microcomputer system, step-down rectifier filter circuit, voltage stabilizing circuit, switch voltage regulating circuit, RS485 communication interface circuit, led row and column driving circuit, ambient light detection circuit, LED display screen, upper PC computer, etc.The structure block diagram of the system is shown in Figure 1.Figure 1 system structure frame2 basic principlesThis design adopts the way of column sending data and row scanning to realize LED display text or image. The method is combined with the hardware circuit to achieve the purpose of relatively uniform overall brightness of the display screen.Using the sensitive characteristics of photosensitive resistance to ambient light, collect the change of ambient light, convert it into electrical signal and send it to the single chip microcomputer. The single chip microcomputer processes the signal, and controls the duty cycle of output PWM wave according to a certain law.A switch voltage regulating circuit is added between the single chip microcomputer and the LED display screen to realize the brightness adjustment of the display screen by the single chip microcomputer. The adjusted PWM wave is used to control the switching voltage regulating circuit, so as to adjust the input voltage of the display screen, and finally realize the brightness control of the display screen.3 circuit design3.1 msp430f169 single chip microcomputer system circuitMsp430f169 single chip microcomputer system circuit is the main control circuit. MSP430 series single chip microcomputer is a 16 bit ultra-low power mixed signal processor introduced to the market by Texas Instruments in 1996. The single chip microcomputer has the following characteristics: ultra-low power consumption, strong processing capacity, rich on-chip peripheral modules, convenient and efficient development environment and stable system operation. Because msp430f169 MCU integrates 12 bit a / D and D / A, and the program of generating PWM wave is simple, there is no need to add a / D circuit, D / a circuit and PWM wave generation circuit, which simplifies the design of peripheral circuit. Therefore, msp430f169 MCU is selected in this design, as shown in Figure 2.Fig. 2 single chip microcomputer system circuit
Chromaticity Processing Technology of LED Display Screen
Chromaticity Processing Technology of LED Display Screen
1 IntroductionLED 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 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.2. Various color processing technologies2.1 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, althoughThe cost is low, but the color gamut of the display screen is small, the color restoration degree is poor, and the brightness is 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 yellow to indicate the flat market. In the transportation industry, the national standard strictly stipulates that the blue-green band indicates traffic and redThe band is forbidden. Therefore, the selection of primary color wavelength is one of the important links of LED display screen.2.2 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.2.3 chroma uniformity treatmentThe 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 center of gravity, we find that the color coordinates of mixed colors can be adjusted to the intersection o of straight line Cr and 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.2.4 color restorationThe 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.2.5 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 yellow and cyan areas with extremely rich colors in nature.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, and we have high saturation yellow and green LEDs. Purple is polychromatic light, and 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 yellow and cyan 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.3 SummaryTo 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.
Uncover the TV Technology Behind the Display Screen
Uncover the TV Technology Behind the Display Screen
Whether driven by Moore's law or consumer demand, the required level of performance in today's TV may seem overwhelming. Compared with the standard definition television format (SDTV), the amount of data driven by the digital television with 1080 pixel high definition (hd) format is 6 times larger. It needs to manage digital television, IPTV, video conference broadcasting and process Dolby AC-3, MPEG and other audio formats. These functions have become the necessary functions of digital television (DTV).In terms of the highest requirements for audio, video and input signal formats, there are several viewing options: forward projection, rear projection, DLP, LCD, plasma and CRT. Whether watching TV on the 1-inch display embedded in the watch or watching TV on the whole wall with the display screen of the projection system, the requirements for the combination of size and performance are almost endless.Fundamentals of digital televisionEven though every TV on the shelf may be very different in size, appearance, shape factor and the basic description given to you by the salesperson, the basic construction modules of TV are very similar when you examine its interior.Generally speaking, digital TV can be divided into less than 10 main modules: display (and driver), core media engine, audio codec and processing, video codec and processing, tuner, interface module and power supply. The absolute performance requirements for each module are defined by the performance level of the comfort experience of your favorite seat.The following figure is a block diagram of a typical digital TV system.Figure 1: block diagram of typical digital TV systemIn Figure 1, we give the basic block diagram of HDTV, which we have considered at the functional block diagram level. Developing the TV system behind the screen requires many tools, which can be obtained from various enterprises. However, in the process of integrating solutions from different component suppliers, it is necessary to speed up the design cycle to shorten the time to market and ensure compatibility. Whether using DLP technology, DSP based digital media processor, other core processing solutions or some other high-performance analog components, it is necessary to design a highly integrated, flexible and easy-to-use digital TV for the rapidly evolving digital TV market. For converged applications, it is very important to design high-performance audio and video codec, graphics acceleration, communication and support functions into the home entertainment experience system.Video designConsumers often put forward very high requirements for video experience when watching TV. Because of this, resolution, brightness, contrast and clarity are important to the "realistic" experience. It is very important for TV to support a variety of ATSC TDV formats, NTSC and PAL decoding, composite and S-Video input and two-dimensional filtering. With the development of HDTV, supporting full HD with 1080i resolution equipped with 3D filtering will be the standard configuration. In the process of receiving the video signal chain shown in Figure 1, it is important to select a video decoder, analog-to-digital converter (ADC) and video buffer with the ability to mix various performances, so that you can adjust the performance according to the cost target of the system.Figure 2 Data stream path of video decoderFigure 2 shows the data stream path of the video decoder, which is responsible for processing NTSC, pal, SECAM, S-Video, SCART, YPbPr, RGB, 480p and other input formats. In digital TV, support for this level of flexibility is necessary, just to make a model work in any format after actual setting. Typical performance characteristics of digital TV decoder include synchronization, blanking, field, active video window, horizontal and vertical synchronization, clock, synchronous phase locking (for downlink video coding synchronization), main CPU interrupt and programmable logic I / O signal. This is a supplement to digital video output and for advanced vertical blanking period (VBI) data recovery. As an additional function, some video decoders support VBI data processor (VDP) for data slicing, parsing and error checking on text television broadcasting, transmission subtitles (CC) and other VBI data. The built-in FIFO stores up to 11 lines of text TV broadcast data, and appropriate main interface synchronization and full screen text TV broadcast recovery are several common requirements in today's system. However, some implementations require a decoder that can provide output formatted data at twice the speed of the sampled original brightness data for VBI processing based on the main CPU.For the ADC in the signal chain, PC and HD video output require improved jitter reduction performance, high image quality in the video system, and can support the increasing bandwidth demand. In the digital TV implementation scheme, an 8 / 10 bit three ADC usually provides a sampling rate of 165 MSPs, which provides rich video performance, and is also an ideal choice for commercial projectors, TVs and set-top boxes.Finally, the output resolution of the video signal chain should be matched with the performance of the display and the resolution of the input signal, so as to optimize the video design. In the era of low resolution CRT TV, it may always be acceptable to adopt a lower performance front end. However, with today's high-resolution display, any noise or irregular signal in the analog front end will be clearly displayed on the screen of digital TV.
Timer Circuit Using LED Dynamic Display Screen
Timer Circuit Using LED Dynamic Display Screen
The circuit is shown in the figure above. C1 and R1 are power on reset circuits, and K is start / pause switch. AT89C2051 is used for IC. Its P1. O and P1.1 ports are also the input of internal comparator. In order to ensure the normal operation of the program, an external pull-up resistor is required. R4-r11 is led current limiting resistor, which can not be used if the brightness is not enough. Dn74000190a is adopted for LED dynamic display screen. The following figure is its schematic diagram. In order to simplify the circuit, only the last two digits of LED dynamic display screen are used. The circuit is very simple, and its main work is software design. The key of software design lies in the compilation and arrangement of digital display forms. Because the pins of the dynamic display screen are time-sharing multiplexed, it is more complicated to compile its digital display table than to use Seven Segment LED digital. You can draw a form on the draft paper first, and fill in O for the bright field and 1 for the off field according to the number of o-9. Convert the binary code into hexadecimal code to get the required coding table. When the program is running, first call the code with pin 1.29 as timing one digit, temporarily store it in R7, and then adjust the code of ten digits to perform logic and operation with R7. The result is sent to port P1 to display half of two digits. Then, the 2.26 pin is encoded in the ten bit digit encoding R6, and then the bit number encoding and R6 are used to carry out logic and operation. The result is sent to port P1 to display the remaining half of the two digits to synthesize a complete digital display.The program is designed for 0 99 seconds to check whether the program and coding table are correct. A timer of 0 99 minutes and o-99 hours can be formed by appropriately changing the software. Used in life and work. Such as car washing machine used in car beauty shop. According to the manufacturer's operating instructions, the engine oil must be changed every 100 hours, but due to the different starting time every day. It is difficult to change the oil on time. This problem is solved after the timer is installed on the machine. This paper is simplified by such a circuit.
Discussion on Protection Grade of LED Display Screen
Discussion on Protection Grade of LED Display Screen
In the process of touching the display screen, we often hear the saying of protection level. Most friends know that this means waterproof and dustproof, but the real meaning represented by each level may not be well distinguished. Here, I might as well learn from you.The protection grade system is drafted by IEC (International Electrotechnical Commission). The full-color LED display screen shall be graded according to its characteristics of dust prevention, prevention of foreign invasion, waterproof and moisture prevention. The foreign objects mentioned here, including tools and human fingers, shall not touch the live part in the lamp to avoid electric shock.IP protection level is composed of two numbers. The first number represents the level of dust prevention and foreign invasion of full-color LED display screen; The second number indicates the tightness of the full-color LED display screen against moisture and water intrusion. The larger the number, the higher the degree of protection. (e.g. ipxx)Dustproof grade (indicated by the first x) and waterproof grade (indicated by the second x)The first X represents the meaning of the digital code0: no protection1: Prevent large solid intrusion2: Prevent the intrusion of medium-sized solids3: Prevent small solids from entering4: Prevent solid objects larger than 1mm from entering5: Prevent harmful dust accumulation6: Completely prevent dust from enteringThe second X represents the meaning of the digital code0: no protection1: Water drops into the shell have no effect2: When the housing is tilted to 15 degrees, the water drops into the housing have no effect3: Water or rain has no effect from the 60 degree corner to the shell4: The liquid splashed on the shell from any direction has no harmful effect5: Rinse with water without any harm6: It can be used in the cabin environment7: It can withstand immersion in a short time (1m)8: Immerse in water for a long time under a certain pressureFor example, a full-color LED display is marked as IP65, indicating that the product can completely prevent dust from entering and can be washed with water without any harm.
Common Problems and Solutions of Luminous Words on LED Display Screen
Common Problems and Solutions of Luminous Words on LED Display Screen
1. Short service life of LED: the theoretical service life of LED produced by regular manufacturers is generally about 80000 hours. Now, many luminous words begin to replace LED modules frequently without using enough for a year, which has brought a lot of trouble and economic losses to customers and advertising manufacturers.Solution: buy a qualified LED single lamp produced by a regular manufacturer (the quality parameter description provided by the manufacturer is required) and make its own module. Never buy a single LED lamp or a manufactured module in the electronic display market. If you need to buy a module, you should see how many resistors are installed on the module. It is best not to use the module with one resistor. The resistance plays a current limiting role in the module, which is easy to heat. After continuous use for a long time, once the resistance is burned out, the module will not light up. LED lights generally do not break. Don't throw away the module. Just replace a resistor with the same resistance value. This can save money for the production unit. In order to reduce trouble and save expenses, it is best to select the module with two resistors. In addition, the production facilities of the supplier making the module should be understood to see whether it adopts anti-static facilities when making the module. If there is no additional anti-static facilities, even if the resistance is not burned out in use, the LED lamp is easy to be broken down and damaged.2. The color fades very fast: the color emitted by the newly installed luminous words is pure and bright, and the color is obviously dimmed after less than a year of use. Make the font red or green very ugly.Solution: the safe use current of LED lamp is generally 20 mA. Beyond this value, although the brightness will increase, the color attenuation will be significantly accelerated. Therefore, when purchasing the assembled LED module, be sure to test its output current value. The brightness below 20 mA is not enough. If it exceeds 22 Ma, the service life of LED will be affected and the color attenuation will be accelerated.3. Uneven color and obvious color difference: it is mainly reflected in the large luminous words made of pure white LED. During assembly, the performance of a single module is not obvious. After the whole font is assembled, the color difference is obvious. The whole font is like a map, one white, one blue and one yellow.Solution: white LED lamps must undergo light and color separation before leaving the factory (some LEDs without light and color separation emit pure white, some are blue and some are yellow). The light and color separation instrument is expensive. Generally, small factories do not have such equipment, so the white light produced is generally obtained from large factories for light and color separation. Because it is not the product of their own factory, Light and color separation will not be so careful. Some small factories do not separate light and color. They usually attract customers at low prices. Therefore, when purchasing white LED, don't blindly covet cheapness. You must buy LED single particle lamps or modules of the same manufacturer, batch and color number to produce luminous words of the same batch.4. Part of the strokes and the whole of the font suddenly don't light up or don't light up when it is on: after the luminous word is used for a period of time, the local or the whole font light source begins to flash, don't light up when it is on, or don't light up at all. Most of the light-emitting modules sold on the market are connected by plug-in wires. In this way, the advertising manufacturer can install the light-emitting module conveniently and quickly. However, there are also some new problems. Due to the erosion of the connector by the moisture in the air during long-term use, it is easy to oxidize, resulting in poor contact, instantaneous or complete power failure of some or all circuits, resulting in flickering or non lighting of the font light source.Solution: A. when making the module, do not use connectors, directly connect it with copper tinned wires, and then solder it firmly with activated carbon solder. B. fully enclosed hollow three-dimensional luminous characters made of artificial agate are used to isolate the contact between light source and air.5. The font output power is large, and the power saving and energy saving are not obvious.Solution: try to use a group of five LED light-emitting modules, so that the number of lamps does not change, and the power is reduced by two fifths.
Visual Display Unit (Monitors)
Visual Display Unit (Monitors)
All computers are connected to some type of display unit, which is called a monitor. The monitor is a part of the computer video system and monitors are available in many different types and size. The on-screen display enables us to see how applications are processing our data, but Visual display unit is important to remember that the screen display is not permanent record i.e. the outputs are lost where the power is off. The thinner monitors used on notebook and other small computer are known as flat-panel displays. Compared to CRT (Cathode Ray Tube) based monitors, flat panel displays consume less electricity and take up much less room.Most flat panel displays use Liquid Crystal Display (LCD) technology. LCD displays sandwich cells containing tiny crystals between two transparent surfaces. By varying the electrical current supplied to each crystal, an images forms. Quality of monitor is often judged in terms of following four factors: None The most important aspect of a monitor is its size. Like televisions, screen sizes are measured in diagonal inches, the distance from lower left corner to the upper right corner diagonally.Typical monitors found in the market are of size 14 inches, and 17 inches and above. The size of display are determines monitor quality. In larger monitors the objects look bigger or more objects can be fitted on the screen. None The screen image is composed of a number of pixel elements. A team pixel is the smallest unit of display screen (the word comes from combination of picture and elements). Each pixel is composed of three phosphor dots, Red, Green and Blue. Now the Dot- pitch is the distance between the phosphor dots that make up a single pixel.The Dot-pitch of color monitors for PCs ranges from about 0.15 mm to 0.30 mm. None resolution. The resolution of a monitor indicates how densely the pixels (a single point in a graphic image) are packed. On color monitors, each pixel is actually composed of three dots - a Red, Green and Blue. Ideally the three points should converge at the same point. Resolution indicates the quality of monitor.Greater the number of pixels, better the resolution and sharper the image. Actually the resolution is determined by the video controller or video adapter card. IBM has provided following adapter cards: The maximum under of points that can be displayed without overlap on a monitor screen is referred to as the. The resolution of a monitor indicates how densely the pixels (a single point in a graphic image) are packed. On color monitors, each pixel is actually composed of three dots - a Red, Green and Blue.Ideally the three points should converge at the same point. Resolution indicates the quality of monitor. Greater the number of pixels, better the resolution and sharper the image. Actually the resolution is determined by the video controller or video adapter card. IBM has provided following adapter cards:iv.Refresh Rate: Refresh Rate is the number of times per second at which each pixel on a screen is refreshed. Display monitors must be redrawn many times per second. The refresh rate for a monitor is measured in hertz (HZ) or cycles/second. Generally monitors refresh rates are 60 HZ or 70 HZ. The faster the refresh rate the less the monitor flickers. Monitors are classified into three categories according to its display colorMonochrome: Monochrome monitors actually display two colors, one for the background and another for foreground.The color can be black (background) and white (foreground), black (background) and green (foreground).Grey-scale: Gray-scale is a special type of monochrome monitor capable of displaying different shades of gray. Background color is usually white in such monitors. Color: Color monitors can display from 1 to 16 million different colours. These monitors are sometimes called RGB (Red, Green, and Blue) monitors because three primary colors Red, Green and Blue are used to make other colours. An RGB monitor consists of cathode ray tube with three-electron guns-one each for Red, Green and Blue at one end and screen at the other end.Color and gray-scale monitors are often classified by the number of they use to represent each pixel. For example, a 14-bit monitor represents each pixel with 24 bits. The more bits per pixel, the more colors and shades the monitor can display. A traditional picture tube is like a big glass bottle. There are electron guns in the narrow end.They fire towards the large flat surface facing the user. The inside of the glass surface is coated with tiny phosphorus dots. There are arrange in groups of three- Red, Blue and Green (for color monitor) phosphorus dot. These dots light up or grow when hit by electrons from the electron gun. The more powerful beam is, the brighter they get. The electron beams are guided by electromagnets, where bend the beams, so they hit the exact desired phosphorus dot.Data imaged is product by moving the electron beam across the phosphor coated screen. Phosphor coating can be made to glow with different intensities by varying the strength of the electron beam, which finally forms character on screen. CRT monitor contains a shadow mask, which is fine mesh made of up metal., fitted to the shape and size of the screen. The holes in the shadow mask's mesh are used to align the electron beams, to insure that they strike precisely the correct phosphorus dot. Mostly, these holes are arranged in triangles.CRT monitor are popular with desktop computers. These are available in monochrome and color monitors. The CRT has display screen of 25 lines of 80 characters each. There are two types of CRT monitors:Composite CRT monitor is used only one electron gun to control the intensity of all these phosphorus dots in each pixel. RGB CRT monitor uses three individual guns, one for its dot, to control the intensity.Each of the sub dots are hit by its own electron gun that is why these monitors give sharper picture.a) As the phosphor dots start to fade after sometime they are hit by the electron gun, they need to be refreshed again.c) They are bulky and heavy. A CRT screen is reliable but it is bulky & consumes a lot of power so it is not used for portable computers. For small computers, flat panel display is used. The most common type of flat panel display are:LCD produces images by aligning molecular crystals. When a voltage is applied, the crystals line up in a way that blocks light from passing through them and the absence of light is seen as characters on the screen.The LCD screen is flat, since it does not have picture tube. Instead the screen image is generated on a flat plastic disk. Thus LCD screens are much thinner, soft and do not flicker as compared to CRT. None LCD is light weight, flat, thin and require less space. None LCD have smaller viewing angle so picture is best viewed when the person is in straight position from the centre of monitor. None The liquid crystals do not emit light so the images are less sharp. None There is a need of backlight setting to enhance sharpness of images. One of the advancement in flat panel display is GPD. Gas Plasma diplay offers flicker free viewing and has higher contrast than LCDs. GPD contains ionized gas (Neon or Xenon) in between two glass plates. Among the two glass plates, one has serial of vertical wires or electrodes while other has series of horizontal wires.When the two placed together, the intersection of horizontal and vertical wire identifies a pixel. When current is applied through appropriate vertical and horizontal lines, the gas at the pixel emits light. Thus characters are formed by glowing combination of appropriate pixels.Given current technology, could TV display screens double as video camera sensors?Even IF - Why would you want to take a photo with zero (or near few mm) field of vision and a lot of blur? Because TV screen would (could) act like a photosensitive paper (or if you are old enough camera film). There would be no lens to focus, no apertures to set the amount of light, no pinholes that would allow you to point to certain area. Screen would take light from everywhere that is not behind the TV. And what would be behind the TV would (could) still have ambient light. So a photo taken with such screen would be very bright (white) on border going to greyish in the middle. Just put a normal camera in the TV. Speakers can work as microphones anyway.
What Is Led Small Spacing Display Screen and How to Define It
What Is Led Small Spacing Display Screen and How to Define It
In fact, in our daily life, we often see LED displays in small shops, concerts and surrounding real estate and hotels. Therefore, the utilization rate of LED displays in our life is very high. Especially outdoor display screens, almost all of them are led display screens; With the maturity of LED small spacing display technology, LED display manufacturers also turn their attention to the wide application market of indoor high-definition full-color small spacing LED display.So, what is the small spacing LED display? How to define it?The LED display screen is composed of LED lamp beads, and the spacing is the distance between two lamp beads. For example, if the distance between two lamp beads is 2.5mm, this is p2.5led display screen, and p1.56 is the distance between two lamp beads, which is 1.5625mm;LED display screen, under the same size, the smaller the spacing, the higher the image resolution, the better the refresh rate, the lower the power consumption, the higher the color gamut, and more in line with the current display requirements; The small LED spacing refers to the models with a spacing below p2.5. At present, the small LED spacing models produced in mass production include: 0.9, 1.25, 1.56, 1.875, 2.0, 2.5, etc. if the adjacent display effects stand at a remote distance, the difference can not be seen, just like 1.56 and 1.875, but there will be some difference in close view. The smaller the spacing, the shorter the viewing distance.In addition, the selection of point spacing will also consider the specific size of the screen into the category of model selection. Because the models are different, the matched box sizes are also different, so sometimes they hesitate, but the manufacturer gives a fixed model, and the price is too high. In fact, this is because of some specific sizes, Use a box to splice, and the matching model of the box is this, so this scheme is given.With the rapid development of science and technology, the development of technology is also rapid progress. The birth of small LED spacing has indeed brought more precise display to LED display screen.fqj
What If the Display Screen Is Distorted
What If the Display Screen Is Distorted
Heilongjiang Changliang: my computer is configured with P 1GHz processor, 256MB memory, 40Gb hard disk, ATI 9200se graphics card, and the display is a 17 inch ordinary CRT. Previously, the windows me operating system was installed, and everything on the display is normal. During the summer, the operating system was upgraded to windows XP, but it was found that the screen display is distorted, and no adjustment is effective, Moreover, the resolution of the display is lower than before. When viewing the system device manager, the system recognizes the display as a "plug and play monitor", and the display model can be correctly identified in Windows me. How can I solve it?A: it may be that the monitor model is old and windows xp cannot normally recognize the monitor. In this way, the system will recognize the monitor as a "plug and play monitor". Although this does not affect any use, it may not give full play to the performance and characteristics of the monitor at this time. Sometimes there are some abnormal problems, such as reduced resolution and refresh rate and irregular screen display, Even through the display menu adjustment is not ideal. This is because there is a 16 bit single chip microcomputer inside the old CRT display, which is used to control and monitor the work of the display, and is also responsible for the communication between the host and the display. When the monitor is connected to the host, the host will check whether the model of the current monitor is the same as that in the system configuration during startup. If it is different, the host will send a command to query. After receiving the command, the display will respond to the command and send the name and physical parameters of the display to the host. After receiving the relevant information, the host will display the model of the display, and then install the appropriate display driver. Therefore, installing the correct driver for the display is an effective means to tap its potential. The display driver can be found in the CD attached to the product. If the CD attached to your display is no longer available, you can find it on the official website of the display product or some websites that provide the display driver.
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