How to Use AT89C51 Single Chip Microcomputer to Control the Circuit Design of LED Display Screen

According to the questionnaire survey conducted by LED display manufacturers, many consumers do not know what is led display? What is LCD splicing screen? These questions often hinder customers' purchase.1. The luminous brightness is strong. When the sun shines directly on the screen surface within the visual distance, the display content is clearly visible2. Automatic brightness adjustment has the function of automatic brightness adjustment, which can obtain the best playback effect in different brightness environments3. Video, animation, charts, text, pictures and other information display, online display and remote control4. Advanced digital video processing technology, distributed scanning, modular design / constant current static drive, automatic brightness adjustment5. Super gray level control has 1024-4096 gray level control. The display color is more than 16.7M, with clear and realistic color and strong three-dimensional sense6. Static scanning technology adopts static latch scanning mode and high-power drive to fully ensure luminous brightness7. Imported large-scale integrated circuits are fully adopted, which greatly improves the reliability and is convenient for debugging and maintenance8. Static scanning technology adopts static latch scanning mode and high-power drive to fully ensure luminous brightness9. The image shall be clear without jitter and ghosting, and distortion shall be eliminated10. Super bright solid color pixel11. All weather work fully adapts to various harsh outdoor environments, with strong overall performance of waterproof, moisture-proof, anti-corrosion, lightning protection and earthquake resistance, good display performance and high cost performance. The pixel barrel can adopt p10mm, P16mm and other specifications.1. High brightness and high contrast: did LCD splicing screen has higher brightness, which is different from ordinary TV and PC LCD? The brightness of TV or PC LCD is generally only 250 300cd / m2, while the brightness of did LCD can reach more than 700cd / m2. Did LCD splicing screen has a contrast of 1200:1, or even 10000:1, which is more than twice that of traditional PC or TV LCD screen and three times that of general rear projection.2. Thanks to the color calibration technology professionally developed for did products, this technology can not only calibrate the color of still pictures, but also calibrate the color of dynamic pictures. Only in this way can we ensure the accuracy and stability of picture output. In terms of color saturation, didlcd can achieve high color saturation of 80% - 92%, while the color saturation of ordinary CRT is only about 50%.3. The brightness is uniform, and the image is stable and does not flicker. Because every point of LCD keeps that color and brightness after receiving the signal, unlike CRT, which needs to constantly refresh pixel points. Therefore, the LCD has uniform brightness, high image quality and absolutely no flicker.4. 120Hz frequency doubling refresh frequency, 120Hz frequency doubling LCD technology of did products? Can it effectively solve the tailing and blur in the process of rapid image motion? Enhance image clarity and contrast? Make the picture clearer? People's eyes are not easy to get tired after watching for a long time.5. Wider viewing angle, using this technology? The visual angle can reach double 180 (transverse and longitudinal). Through the application of PVA technology, namely "image vertical adjustment technology", the LCD splicing screen has a wider visual angle.6. Pure flat panel display. LCD is the representative of flat panel display equipment. It is a real flat panel display with no curvature and large screen? No distortion.7. Ultra thin narrow edge design, LCD splicing screen not only has the characteristics of large display area, but also has the advantages of ultra light and thin. It can be spliced and installed conveniently. The special LCD screen for splicing, with its excellent narrow edge design, makes the edge of its single chip even less than 1 cm, so that the small edge effect will not affect the overall display effect of the whole display screen.8. High service life. The service life of the backlight of didlcd LCD screen can reach more than 50000-100000 hours? This ensures the consistency of brightness, contrast and chroma of each LCD used for splicing display after long-term use? And ensure that the service life of the display screen is not less than 50000 hours.9. The reliability is better. The ordinary LCD screen is designed for TV and PC display, and does not support continuous use day and night. ID LCD is designed for monitoring center and display center? Support continuous use in 7x24 hours.

Design of LED display screen based on GSM moduleAbstract: This paper introduces the hardware interface circuit between TC35i module and AT89C51 single chip microcomputer, analyzes in detail the process of information transmission between AT89C51 and TC35i and how to read Chinese character code from memory and provide it to LED display screen, and explains the problems needing attention in information transmission.1 Introduction With the development of communication technology, the service function based on mobile communication network is expanding to the field of industrial control and remote control. In order to meet this need, Siemens has launched a new generation of TC35i wireless communication GSM module. Based on the short message function of the module, user information processing and other functions can be realized quickly, safely and reliably. It is especially suitable for occasions where the control center is far away from the terminal equipment or it is not convenient to use wired communication media. The system is composed of control center and several display screens. The control center sends the latest information to each display screen in real time to form the communication link between the control center and the display screen.2 hardware interface circuit between TC35i and MCU TC35i can realize data, voice transmission, short message service and fax in the system scheme quickly, safely and reliably. The working voltage of the module is 3.3 V 5.5 V, which can work at 900 MHz 1800MHz. The module has at command set interface and supports text and PDU mode short messages. In addition, the module also has the functions of telephone book, multi-party call and roaming detection. The common working modes include power saving mode, i-dle and talk. The bidirectional transmission of power connection, command, data, voice signal and control signal is realized through 40 pin ZIF connector. The SIM card holder and antenna can be connected respectively through ZIF connector and 50 antenna connector. In the control system, AT89C51 single chip microcomputer is used to expand ram6264 at the same time to store 128 B data to be displayed corresponding to the display screen and information read from GSM module. In order to increase the capacity of storing data, am29f040 flashmemory (512 KB) is adopted in this design. It has large storage capacity, high integration, low cost, flexible reading and writing and good data nonvolatile. It has 15 address lines, of which the low 8-bit address is provided by port P0 after being latched by 74HC373, and the high 11 bit address is provided by port P2 together with P1.4, P1.5 and P1.6. 8-bit data is directly provided by Po port. Using dynamic scanning mode, 16 lines of progressive scanning are carried out with 74hcl54 and 74HC595. Using the visual persistence effect of human eyes, I / O resources can be saved and calorific value can be reduced.3 working principle As shown in Figure L, at the receiving terminal, the single chip microcomputer reads the data carried by TC35i module in the form of short message, and displays it on the LED display screen after processing. Because the Chinese character in the short message is only one code, the MCU application system changes the code into Chinese character dot matrix data, and the Chinese character library must be configured. Therefore, when designing the MCU application system, the control center edits the PDU packet data and adopts the user-defined data mode. Among them, the data representing Chinese characters directly uses the internal code of Chinese characters, and the word library configured by the system is the Chinese character library encoded by gb-2312, that is, the location code Chinese character library. Next, the data format of smspdu is introduced by analyzing the outgoing information stored in the mobile phone. First, write a message with your mobile phone. The sending mobile phone number is 13605696031 and the message content is "HelloWorld!". This message can be read out by executing at cmgl = 2.The operation process is as follows (italicized characters are the response information and is the comment):The software interface between MCU and mobile phone is actually the technology that MCU controls mobile phone through at command related to GSM short message, such as reading the short message content of mobile phone, deleting the short message content, listing the unread short messages in mobile phone, etc. Executing l instructions is not as simple as some materials. In fact, the execution process of instructions requires the interactive response between MCU and mobile phone. There are strict regulations on the number of bytes sent or received each time. The two must realize data exchange according to these regulations, otherwise, the communication will fail. Table L lists the at instruction execution process.The instruction symbols, constants, PDU data packets, etc. of all at instructions are transmitted in the form of ASC coding, such as ASC coding of "a" is 41h, "ASC coding of" t "is 54H, ASC coding of number" 0 "is 30h, etc.When the single chip microcomputer controls the operation of the mobile phone, the SMS working mode of the mobile phone must be set to PDU format, that is, it is completed through the instruction at cmgf = 0.After the single chip microcomputer sends each l instruction to the mobile phone, the carriage return character must be used as the end of the instruction. The ASC code of carriage return is ODH. For example, the single chip microcomputer sends the "at cmgf = 0" instruction to the mobile phone, and its ASC code is listed as "41h, 54H, 2bh, 42h, 4dh, 47h, 46h, 3dH, 30h and 0dh" , the last byte 0dh is the carriage return, indicating the end of the instruction. If there is no carriage return, the mobile phone will not recognize the instruction.When the mobile phone receives a complete at instruction, the mobile phone does not execute the instruction immediately, but first reverses all ASC II coding sequences of the at instruction just received (including ODH), then sends one carriage return and line feed ASC II coding, i.e. 0dh and OAH, and finally executes the instruction.When the mobile phone sends short message content to the single chip microcomputer, the content of its PDU data packet is hexadecimal data, but it does not directly transfer hexadecimal data to the single chip microcomputer, but still encodes each hexadecimal number ASC to send, so that the hexadecimal number of 2 bytes becomes ASC code of 4 bytes. However, the length of data bytes in the PDU data packet is still the actual word The section length, rather than the byte length of ASC code, should be paid special attention during programming, otherwise the received data will be incomplete. After receiving the PDU packet data, the single chip microcomputer must restore it to hexadecimal data, and its algorithm is as follows:Let a be the received ASC code. B be the converted hexadecimal number. Then, if a 39H, B = a-30h-07h. Finally, combine the first and second numbers into one byte.

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.

NEW DELHI: Not contend with just reclaiming the number one spot - in terms of sales - in the Indian luxury car segment, Mercedes Benz has roared ahead by periodically adding models to its product portfolio for the country. And one particular model that has helped the Germans consolidate here has been the highly successful E Class. Little wonder then that the company this year opted to better its best and introduce the all-new 2017 Long Wheelbase Version (LWB) E Class.LWB is indeed a striking highlight of the 2017 E Class. The car has been - put absolutely simply - pulled between the wheels and now measures 3,079mm. This is a stretch of 140mm over the outgoing model - quite commendable indeed. And also quite noticeable with the sedan's side profile lending it a Maybach-ish aura. ExteriorsThe regal side profile courtesy the elongated wheelbase aside, the 2017 E Class looks every bit as royal from every other angle as well. The front grille is simplistically sophisticated - a design element which Mercedes has perfected. The grille is flanked by all-LED head lights which now feature an all-new LED DRL system. The enormous bonnet has underplayed fine lines on both ends which completes an extremely pleasing front profile. From the side, the chrome insets are quite generously visible but unlike a few cars in lower and much lower segments, it is far from being garish. The side windows are not enormous but adequate enough to ensure the cabin is adequately airy. The sudden but smooth flow back of the roofline too ensures that even the tallest of passengers won't find anything to complain in the backseat.The rear of the car once again is aesthetic with LED tail lights, twin chrome exhausts, a dash of stright-line chrome over the numberplate completing the look. Nothing is an overkill here and therein lies the charm. InteriorsThe E Class blends certain elements of the S and the C Class on the outside. Inside, there is opulence enough to take the car closer to its elder sibling rather than the younger. Yes, the new E-Class has taken the game to an all-new playing field - one which so far had cars belonging to a one-up segment. The rear of the car is really the place to be with one-push memory-function reclining seats, touch-button side and rear shades, front passenger seat position control (only for the rear-passenger on the left), one-touch sunroof and contoured leather seats fit for royalty. And of course, the elongated wheelbase makes for more rear space than one would know what to do with. Such is the level of comfort and convenience that some other features like rear AC vents, air-quality control, rear-seat center arm-rest, rear power and USB outlets seem almost too plebeian.The E-Class is usually chauffeur-driven but Mercedes has ensured the front passenger has a generous dose of luxury at his/her disposal too. Here, the first thing that commands attention is Mercedes' COMMAND infotainment system - a 12.1 inch AV interface that is truly the center of entertainment and information display. It is positioned well to keep it shaded from the Indian sun even though the vivid and bright display may have held its own under direct rays. From navigation to climate control, engine information and car performance - the infotainment system is a breeze to use and gorgeous to see. It, however, could have really been a winner had it been a touch-screen - considering the touch-screen displays are quite common in Indian cars now. Nonetheless, once accustomed to not poking at it, the display can the real ceterpiece of a masterpiece.Speaking of masterpieces, the E-Class is equipped with 13-speaker 590W Burmester system that is worthy of the ambiance that the car seeks to provide its passengers. And, if even that falls just short of expectations, there is the 64-shade ambient lighting system that is perhaps the only overkill Mercedes did in the entire package. On long night drives though, none may be found complaining as the shades change gradually using the toggle button and display screen. DriveWhile there is indeed much that Mercedes has worked on to bring about a fresh look and feel in and around the new E Class, it is the drive that truly defines any car. The new E Class may not be just any car but the drive goes an extra mile - or two - to underline its characteristics.Offered in 2.0-litre inline four-cylinder petrol, this review however focused on the extremely powerful 3-litre diesel V6 which has 255 bhp and 620 Nm of torque. Numbers may at best be indicative but the drive itself is where all of the power is truly at. Once again offered in five drive modes - Individual, Eco, Comfort, Sport and Sport , the E Class moves almost exactly as one would want it to in the selected mode. The 9G-TRONIC auto gearbox is - for the lack of a better adjective - velvety smooth while paddle shifters are present as well. The diesel motor continues to be as refined as ever and the car makes mincemeat of roads without losing its elegance. It however is important to mention that the Comfort mode could have done with a bit more punch in keeping true to the overall driving dynamics of the car. There is that marginally extra bit of pause when pushing the car forward in this mode even though the air suspensions in the car for this review made a mockery of every bump in the way.The steering remains light and nimble while not losing out on the strong feedback to keep the driver composed at triple-digit speeds which, Mercedes claims, comes up in 6.6 seconds in the diesel version.VerdictRs 69.47 lakh (ex showroom) for the E 350d, the new model is far from being inexpensive - even by Mercedes standards. The price tag though is not for nothing as here is a car that now has comfort and technological additions almost matching the pricier S Class. The passengers can hardly ask for more as they sprawl in sheer luxury. The one behind the wheel too has a lot going with a car that rides really confident despite its now elongated proportions. The competition has remained stiff with BMW 5-series and Audi A6 being very capable cars too. With the new E Class though, Mercedes has surely taken the attack to the rivals' camp and promises to come out unscathed.

Although you may think that a projector is an old fashion equipment, it is still important today. Businesses and schools still rely on it to make presentations. Although a computer can be used to do presentation, it is not suitable when presenting to a large group of people. Using a projector is the answer.Choosing the right projector for your business is not hard as long as you know what to look out for. First of all, you must decide what type of projector you need. If you are required to move from room to room to do presentation, you may want to get a slim and portable projector. A portable model is light and can save you a lot of hassles. If you usually present in a main conference room, then getting something bigger and stable will be more ideal.Projectors are easy to set up and do not require a lot of technical knowledge. Its setup is something similar to how you will set up a laptop. Plug in the power cable, power on, and choose the mode that you want.In the past, you will need to pay a high price for a projector. But today, it is really very affordable. The price will vary depending on the features of the projector. So make sure that you get one that meets your needs. Before you purchase one, make sure that you test it first. Ask the salesperson to demonstrate how to set up and use the projector before you buy it. This will ensure that you are getting something that is working fine.Also, you should conduct a thorough research before buying a projector. Go to the Internet and visit forums that talk about projectors and presentation. Read the reviews and shortlist a few types of models to buy. A hasty decision will usually deliver disappointment.By getting the right projector, it will improve your presentation and make you look more professional. Especially for a larger group presentation, getting a LCD projector that projects clear display is extremely important. Do not forget that the display screen also plays a part in a good presentation. So you should always look for a display screen that is suited for your projector.Hope that now you have a better understanding on how to get the right projector for your business. A good projector is definitely an asset to your company and worth every cent that you pay for it.

The US Transportation Department has issued a rule that will require rear-view technology in many new vehicles - an effort to reduce deaths and serious injuries caused by backup accidents.The final rule issued by the National Highway Traffic Safety Administration on Monday will require new vehicles under 10,000 pounds (4,535kg) and built on-or-after May 1, 2018 to meet the new rear-visibility standards. The rule includes buses and trucks. Motorcycles and trailers are exempt.The rear-view cameras must give drivers a field of vision measuring at least 10 by 20 feet (3 by 6m) directly behind the vehicle. The system must also meet other requirements including dashboard image size, lighting conditions and display time.Reversing accidents involving light vehicles cause an average of 210 deaths and 15,000 injuries a year, and victims often include children and the elderly, the government said. Children under five years old account for 31 per cent of the deaths each year, while adults 70 years of age and older represent about 26 per cent.NHTSA said the new rule, required in the Cameron Gulbransen Kids Transportation Safety Act, will save between 13 to 15 lives per year and prevent as many as 1,125 injuries per year. The measure, signed into law in 2008, was named for a two-year-old Long Island boy whose pediatrician father backed over him in their driveway in 2002.The government estimates that a rear-view system will cost between $US132 and $US142 ($A143 and $A154) per vehicle. It will cost about $US43 to $US45 for vehicles that already have a dashboard display screen, but need upgrades to comply with the rule.Compliance will be phased in by manufacturers starting in May 2016, before it becomes mandatory two years later."Today's decision will save lives and save money for consumers," Advocates for Highway and Auto Safety President Jackie Gillan said in a statement."Every make and model will be required to meet this new safety standard and every family will benefit.

Quite a few technological cynics would say it really is these kinds of a waste of money to buy iPod touch 32GB. Blame it on the absence of initial-hand details and ignorance on the subject and on the gadget. What they never know is how useful this gadget is in every day things to do.Reality is, the iPod touch is among the couple of devices that don't appear and go. It is really not a little something that you will just throw absent in the bin and get bored with effortlessly. That stated, let's take a appear at the positive aspects an individual gets from acquiring the gadget.1. The storage and memory potential is large. To begin with, the storage potential is 32GB, and second, it has an integrated memory flash for supplemental capability. When it comes to storage and memory purposes, it can serve you properly for keeping several music files, movies, photographs, and video games as significantly as you want-just about like your particular laptop or computer turned into a helpful 1.2. It is Wi-Fi able, which signifies you can surf the web as nicely. Therefore, there is no need to have to often be managing to your own computer to surf and look at your mails or favored movies. Not only that, you can as properly use this gadget for investigation functions, thanks to its Wi-Fi capability which aids you connect anyplace at anytime.three. The stereo sound good quality is superior, distinct, and dependable, in contrast to those common transportable disc gamers that may perhaps put on out in time. It has a developed-in equalizer that enhances the superior and stability of the sound, removing also a lot noise.four. The iPod touch is also fairly like your digital camera the place you can store your digital images in different specifications and continue to keep its substantial excellent, and considerably like your video clip recorder that supports different digital video criteria, also.5. Very last but not the least, it presents unique headphone styles for ease of use.Having said that, of course, in every single technological creation, there are always one or two characteristics that you, as a purchaser, might not like. That's regular. For an individual, due to the fact it really is designed helpful, the tiny display keyboard may well be considered a bane for some gadget freaks who want significant keyboards or display screen that is. Utilize prevalent perception though: If you want a even bigger screen or keyboard, go get a mini-laptop or computer system, not an iPod touch. The modest display screen and keyboard was a principle to make the gadget useful to use at any time, anywhere, not having sensation the bulk of carrying or keeping it.When you approach to purchase iPod touch 32GB, you are certain to obtain a beneficial products. But never neglect this, a superior product signifies a different point: a swooping price tag tag. Are you all set to get ripped off? Try to remember, correct to what you hear, Apple brand does not market its items low-cost and not often goes on a sale or low cost. Nonetheless, if you are fairly positive you want an iPod touch, go in advance and sacrifice your financial savings just this one time. I'm sure you won't regret it.Tags:

Out of all the extreme vaporizer the V-Tower vaporizer turn out to be outstanding with some special features like beautiful LCD display screen, Stainless steel housing, plenty of glass and a blue base lights. The V-Tower has become the market leaders when it comes to vaporizers and surely deserves the place. During the procedure in the Arizer Extreme vaporizer the hot air passes through the bowl into the bag or it can also pass through the hose. For displaying the temperature it has an LCD screen and has a fan which has a feature for controlling the speed. In the presence of the whips the hits make are fine and quick. It is automatic and has a remote. So now you can sit back and relax while the vaporizer will do the job. Thus the extreme vaporizer us a best for your pocket as well for its features. Some of the attributes of Extreme Vaporizers are: This vaporizer will only cost you around 299$ at the Vaporizer giant while the digital vaporizer will come at the price range of 699$. Next it has an LCD screen which shows the temperature and as the feature of fan also which you can adjust yourself according to the suitability of your herb. You can also change the temperature from Celsius to Fahrenheit. The Glass used is made from the borosilicate which is the toughest glass in the world. The glass has got finesse by giving it a perfect structure and a shape. The taste of the herb is a delight in the company of a ceramic heater and thus uplifting its natural herbs. It is the only vaporizers which is fully automatic and comes with a remote control. It has all the automatic functions like on/off, adjusting speed of the fan , a timer. Also it gives you the feature of 9 preset temperatures giving you the wide variety of temperatures to choose from. It is also equipped with lots of glass and a chamber in which the procedure runs through smoothly giving you the pleasure of smoking.

MYSORE: The postal department has gone hi-tech in advertisement of its products and schemes. The Liquid Crystal Display (LCD) screens have been put up at three post offices in the city to educate public about various facilities provided by the department. As part of modernization, the authorities have installed display screens at the head post office near Nehru Circle and at Saraswathipuram and K R Nagara branches to promote its mail, financial and premium services. An official at the head post office stated that the display screen was installed six months ago and it has yielded results as more number of people are coming forward to avail of the facilities. According to him, over 1,000 persons visit the post office everyday and this has come handy for them to educate masses. The e-post serive ensures larger reach. With this facility, people can send their message to any address in India with a combination of electronic transmission and physical delivery through a network of over 1.55 lakh post offices. E-post sends message as a soft copy through the internet and it will be delivered in the form of a hardcopy. The service costs Rs 10 per A-4 size paper. Such facilities are being screened to create awareness. This apart, consumer awareness advertisements are being displayed to educate people about supply of foodgrains through the public distribution system. Assistant superintendent of posts, Mysore division, Mahadevaiah told TOI that the initiative is a part of the Project Arrow scheme. LCD screens are put up at three posts office to promote products relating to business development, insurance and finance.

What should we pay attention to in the selection of LED display in hotel banquet hall? Generally, in the indoor environment, the screen area will exceed 3 m2. Therefore, in this case, there are three options: ordinary rear projection, DLP (digital liquid crystal rear projection) and LED display.The advantages of ordinary rear projection display screen are small pixels and high definition. The disadvantages are low brightness, small viewing angle and short lens lamp life (only a few thousand hours). DLP has the advantages of small pixel points and high definition. The disadvantage is that it has seam. At present, the minimum seam can reach 1mm. Rear projection and plasma display screens are suitable for close viewing. For Maipu Guangcai indoor LED display, the advantages are high brightness and no seam, while the disadvantages are coarse pixel particles and low definition. At present, the economic model of commercialized indoor full-color LED screen is p5p6, and other models include p3p4p7.62p8. LED display screen is suitable for indoor places with long viewing distance.When selecting LED display in banquet hall, the following aspects can be considered:1. Die. Like the outdoor full-color LED screen, it is generally recommended that the LED of the indoor full-color display screen adopt the LED encapsulated by Maipu brilliance, and the tube cores of Japan Riya and Cree of the United States are recommended for high-end products.2. Packaging form. The advantages of surface mount packaging are large viewing angle, good luminous consistency and easy automatic welding processing. It is the mainstream product of full-color screen.3. Density. Due to the large heating capacity of indoor full-color LED chip and high density of control circuit, the point density of commercial full-color screen can not be very high. Hotel Maipu Guangcai LED display manufacturer4. Drive mode. The driving mode of indoor Maipu Guangcai full-color LED screen is constant current driving and adopts dynamic scanning mode (mainly 1 / 4, 1 / 81 / 16 and other scanning modes).5. Refresh rate. Improve the refresh rate, and there is no flicker and tailing when shooting with the camera.Other considerations include the scale and brand, price, purpose, installation location and environment of LED display manufacturers. The above are some suggestions on the selection of LED display in hotel banquet hall.fqj