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What is the gray scale of LED display?

Color reproduction is achieved by the different brightness combinations of the three primary colors of red, green and blue. The brightness level of each primary color is called gray level. The wonderful degree of color reproduction depends on the number of gray levels of the three primary colors. The higher the value, the more realistic the color reproduction.
The realization of grayscale is realized by controlling the duty ratio of the current of the LED tube. We have developed mature 1024-level grayscale control technology and applied it to full-color LED display, enabling the full-color display to reproduce 16.67 million colors, which is at the leading domestic level.
In addition, we have adopted a unique g-correction technology. On the 1024 grayscales of the same primary color, if we simply use the equal-interval brightening technology, that is, each grayscale is divided into equal parts according to a linear law, the picture will be blurred and the sense of hierarchy will be poor. After careful analysis of the visual characteristics of the human eye, we took the lead in proposing and implementing the nonlinear step correction (ie g correction) technology according to the luminous characteristics of LEDs. This technology has a small level difference in the low-brightness area, and the number of gray levels is dense. Gradually, the level difference increases and the number of gray levels decreases in the high-brightness area. Finally, the “level difference consistency” in the visual effect is caused to ensure that the screen has a better visual effect. .

What does Scan of the LED screen mean?

In the full-color, single-color, two-color series products of LED electronic display, the scanning methods are 1/16, 1/8, 1/4, 1/2, static and so on. What if there is a difference? A simplest method is to count the number of LEDs on the LED large screen unit board and the number of 74HC595.
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Calculation method: divide the number of leds by the number of 74HC595 and then divide by 8 = fractional scan
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The real pixel LED electronic screen corresponds to the virtual LED electronic display screen: in short, the real pixel screen means that each of the three light-emitting tubes of red, green and blue that constitute the LED display only participates in one pixel at the end. imaging application to achieve satisfactory brightness.

 

The virtual pixel uses a software algorithm to control the end of each color light-emitting tube to participate in the imaging of multiple adjacent pixels, so that a larger resolution can be achieved with fewer light tubes, which can increase the display resolution by four times.
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In the full-color LED display series products, there are 16 scans, 8 scans, 4 scans, etc., and there are differences between them as follows:
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1. The scanning method of the LED screen is different;
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2. The brightness of the LED screen is different (16s is less than 8s and less than 4s)
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3. The quotations are different, which may be understood as the number of driver IC chips used (the same type of 16s is lower than 8s and lower than 4s)
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The LED display screens on the current market can be roughly divided into two methods: static scanning and dynamic scanning! Static scanning is divided into static real pixels and static virtual! Dynamic scanning is also divided into dynamic real image and dynamic virtual, with 2 scans, 4 scans, 8 scans, and 16 scans.
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To illustrate: an outdoor PH16 full-color LED display commonly used full-color module pixel is 16*8 (2R1G1B), if it is driven by MBI5026, the module uses:
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16*8*(2+1+1)=512 lamps, MBI5026 is a 16-bit chip, 512/16=32
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(1) If 32 MBI5026 chips are used, it is a static virtual
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(2) If 16 MBI5026 chips are used, it is a dynamic 1/2 scan virtual
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(3) If 8 MBI5026 chips are used, it is a dynamic 1/4 scan virtual
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If two red lights are connected in series on the full-color LED display unit board
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(4) Using 24 MBI5026 chips, it is a static real pixel
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(5) With 12 MBI5026 chips, it is a dynamic 1/2 scan real pixel
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(6) Using 6 MBI5026 chips, it is a dynamic 1/4 scan real pixel

How to choose the outdoor full color LED display model

The common ones are P3, P4, P5, P6, P8, P10, P12, P16, P20 and other outdoor full-color LED displays. The outdoor LED display is in the form of DIP or SMD, and the commonly used form is SMD. If the outdoor LED display adopts the DIP form, that is to say, our three red, green and blue lights are separated, and each light is independent. There are three lights forming a pixel, forming an LED unit board. If it is a lamp bead in the form of SMD, the three lamps are combined into one lamp bead, which can effectively reduce the production cost, and the color mixing effect of this form is better.

Installation height

Installation height: According to our outdoor installation height, it can provide a good basis for us to choose the LED display model. If our installation height is higher and the screen area is larger, we can choose a larger LED display, such as P16, P20, etc.; otherwise, choose P10, P8, P6, P5, P4, P3, etc.

Installation method: The installation method is different, which is an important reference for us to choose the LED display box. Generally, in addition to the wall-mounted installation method, other installation methods, I recommend using a sealed box.

viewing distance

The nearest viewing distance is also one of the important references for choosing an outdoor full-color LED display.

Matters needing attention in the water treatment process of LED display

1. When water is found in the warehouse or the LED display screen, it should be dealt with urgently without delay.

2. Organize personnel to blow dry the LED display screen.

3. Do not put the LED display screen that has been flooded into the air box, it is easy to make the LED light boring.

4. When water enters the warehouse, the air box may enter water. All air boxes should be exposed to the sun to prevent moisture from volatilizing into the LED display screen after the box is installed.

5. Failure to handle all flooded LED displays in time may affect the stability of the screen to a greater or lesser extent. During emergency treatment, the screen may die continuously after the screen is powered on. Please pay attention to all the bosses. observe.

6. All water-ingressed LED display screens are in the flight case. After more than 72 hours, the screen has basically no repair value. Please handle it with caution.

The secret of preventing the aging of LED products

Aging is important for electronic products, and guarantee is the last step after product production. After debugging, LED products can improve product stability and ensure the stability of product use. A very important device, but it is used by people in many times and cannot be used as a correct and effective device.

1. The LED emission test is to improve the performance of the product according to the failure rate of the product, that is, the characteristics of the road map and the application goal, but the basis of this method, the life of the LED product that cultivates the mature test basis is long.

2. LED aging methods include constant current aging and constant finger pressure equipment. Constant current means that the current is constant at any time. If there is a frequency problem, it is not a constant current. Constant current aging is the most consistent LED current operating characteristic. , Is the most scientific LED aging method;

3. Overcurrent impact aging is also an aging method used. By using factory water, the current is permanently aging and aging, in order to judge the quality and life expectancy of the LED, it can pick out many faulty LEDs that are often aging and cannot be singled out.

P8 outdoor surface mount SMD3535 full color LED display project case

Introduction and characteristics of outdoor P8 full-color LED display

Creuview uses high-quality red, green, and blue chips to be packaged in a three-in-one surface mount lamp bead. A three-in-one surface mount lamp bead is a full-color pixel. The surface mount lamp beads are evenly attached to the front of the circuit board at a certain interval and fixed by soldering

The lamp surface of the module is filled with waterproof glue, the back of the circuit board is affixed with electronic components such as driving and control, and then the finished circuit board is fixed and protected with a plastic kit. This is the basic display unit of the outdoor full-color LED display, referred to as the LED module. Multiple modules and waterproof rubber rings are assembled into a single LED box, and multiple boxes are assembled into a seamless LED large screen. The large screen needs to be equipped with a driving power supply and a control system before it can be used.

High display brightness: the brightness can reach more than 8000cd/㎡, so far no outdoor display product can surpass it, and the brightness of the LED display can be automatically adjusted according to the intensity of the ambient light, and the picture quality is clear and bright

Good display effect: Non-linear correction technology makes the image delicate, saturated color, strong sense of layering, smooth and vivid

High resolution: With the continuous breakthrough of outdoor small spacing, coupled with the larger outdoor screen area, the overall screen resolution has reached a higher level, which can more express high-definition picture quality and rich colors

High protection level: waterproof and dustproof design, protection level up to IP65, the selected materials are resistant to ultraviolet rays, deformation, aging, high and low temperature.

Good uniformity: The wavelength deviation can be controlled within ± 2nm, the chromaticity and brightness consistency can reach 99%, the flatness is ± 0.1mm, and the seam gap is less than 0.2mm, so that the color uniformity and consistency are excellent

Convenient operation: It is controlled by commonly used computer operating system and general playback software, easy to learn and understand, and the playback content and sequence can be edited at will

Ultra-long life: LED lamp beads can last up to 100,000 hours. High-quality light-emitting components are the core material of the display. The circuit board design is optimized to fundamentally ensure the life of the product.

Energy saving and environmental protection: LED display light-emitting materials are energy-saving products, equipped with constant current drive energy-saving IC and high conversion rate drive power, and the brightness can be automatically adjusted

Wide viewing angle: large-angle design, high-precision equipment and high-precision production technology, making the horizontal and vertical viewing angles wider

Stable performance: Unique anti-electromagnetic wave processing, distributed scanning technology, and modular design make the reliability and stability higher.

Wide playback content: It can display text, tables, images, animations, videos, etc., equipped with power amplifier and audio to synchronize the picture and sound, equipped with a TV box to rebroadcast TV programs, and equipped with a video processor to achieve live broadcasting

Multiple control methods: equipped with different control systems, which can realize synchronous control, asynchronous control, wireless control, network control, and remote control

Various shapes: rectangles, squares, arcs, circles and other customized designs can be made

Convenient maintenance: Modular design is adopted to make maintenance and replacement of spare parts convenient and quick.

P2.5 Full Color LED Display HD Small Pitch Project Case

Recently, there was good news. The P2.5 full-color LED display produced by CREUVIEW and installed in Xi’an Chanba Ecological Park was completed. The expert’s acceptance was fully qualified and passed smoothly. The user is very satisfied and gave CREUVIEW’s high-definition LED display. It is highly recognized.

   Among them, not only our products are praised, but also the vigorous and dedicated work style of the engineers and technicians shocked the customers. The customer of this project has been hesitant in the procurement comparison process. The poster customer sent someone to visit the company’s production scale and strength and product quality before signing the procurement contract. This resulted in a very tight construction period. When I arrived, I rushed to the project site and worked overtime all night to install and debug, which was completed one day earlier than the scheduled construction period. The customer was impressed by CREUVIEW’s engineering services.

 P2.5 high-definition small-pitch LED full-color display, produced with imported brand chips, high-brush driver IC, and special anti-shadow circuit design. Effectively eliminate moiré, wide color temperature adjustment, low brightness and high gray effect, high refresh rate, non-reflective, ultra-high resolution, realistic color reproduction, seamless vision, nanosecond response speed, low power consumption, ultra-quiet And other advantages. Widely used in electric power, civil air defense, transportation, radio and television, public safety, conference rooms, water conservancy and water affairs, tobacco and other industries: indoor control rooms, large conference centers, security monitoring, production emergency command, large-scale performances, competitions, radio and television industry background walls , Commercial brand display, public information display, etc.

Outdoor full-color LED display lightning protection treatment

1.Protection against direct lightning strikes: Install lightning rods on the support structure of the LED display (outdoor), indoor LED displays or LED displays with tall buildings next to them, you do not need to consider installing lightning rods.

2.For the counterattack of the steel structure, connect the rigid structure to the housing of the LED display screen, equipotentially, and ground. The grounding resistance is generally required to be less than 10 ohms. If the resistance does not meet the requirements, additional The artificial grounding grid. The lightning arrester should also be well grounded.

3. For the lightning current induced on the power line, install a single-phase or three-phase power surge protector on the power line. The cross-sectional area of ​​the link wire of the phase wire cannot be less than 10mm square, and the cross-sectional area of ​​the ground wire can not be less than 16mm square.

4.For the lightning current induced on the signal line, install a signal lightning protection device on the signal line. The signal lightning arrester is determined according to the signal interface of the system. If it is a network cable, install a network signal lightning protection device, and install a DB9 interface lightning protection device for the serial interface. The cross-sectional area of ​​the ground wire cannot be less than 1.5mm square.

5.For the induced current of lightning strikes, a unified dedicated professional distribution box and power distribution cabinet can more comprehensively and effectively protect the entire circuit system from the interference of the lightning induced current.

Outdoor full-color LED display heat dissipation treatment

NO. one, LED display within 20 square meters

   Generally, no air conditioner can be used. If conditions permit, two fans with a diameter of about 500mm can be used, depending on the size of the installation space.

NO. Two, LED display screen with more than 20 square meter

1.If the LED display is installed against the wall and can protrude by one meter from the wall, it is recommended to choose the fan according to the area, and the fan should be installed in sequence above the side of the screen. If you buy an outdoor full-color LED screen with a ph16 of 80 square meters, it means that the fan you buy requires 6 axial fans with a diameter of about 600 mm. Make sure that there is a net inside to prevent the technician repairing the display from sucking in clothes and other things when repairing the display to prevent personal injury. For waterproofing, install the air outlet of the fan on the outside aluminum-plastic panel Aluminum shutters. The wall-mounted LED display screen can also be installed with air conditioners. Ensure that there is enough space for the air conditioner host without affecting the overall appearance of the wall. The choice of air conditioner is required. Generally, 1.5P, 2P and 3P air conditioners are used the most. Northern cities use 12 square meters of 1P air-conditioning calculations; southern cities use 9 square meters of 1P air-conditioning calculations. If the area of ​​the LED outdoor display is relatively large, the air conditioner needs to be customized; if the area is not large, you can buy it at a specialty store, but you need to buy a display cooling air conditioner with call compensation function.

2.If the LED display is installed on a column, a fan can be used to dissipate heat. The fan is installed on the top of the aluminum-plastic panel on the back of the large screen and made into blinds so that rain does not enter the display when it rains. If it is a double-pillar LED display, you can open several blinds in the middle of the double-pillar. This Baiye window is the air inlet, and the fan above is the air outlet, so that complete air convection is formed and the heat dissipation effect is better.

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