CHOOSING THE RIGHT LED DISPLAY!

Mar 24, 2021 | ledtips | 1 comment

CHOOSING THE RIGHT LED DISPLAY!

Video walls can create stunning centerpieces for a variety of spaces. LED video displays can transform any environment, but you may become overwhelmed when you look at all the options on the market. There are many elements to consider when selecting video screens, including indoor vs outdoor, pixel pitch, front vs rear serviceability, and shape. If you aren’t sure where to start, VISIONPI has products to fit every need.

So Many Video Wall Options—Where to Start

To get started, it’s essential to understand the basics. Here are some fast facts you should know:

  • An LED (light emitting diode) is a semiconductor device that emits visible light when an electric current passes through it.
  • LEDs require much less power than other types of screens powered by incandescent lamps, offering greater efficiency and a longer lifespan.
  • Indoor LED screens have wide-viewing angles, no color shifts, and have a smooth appearance from a short distance.
  • Outdoor LEDs are weather-proof, very bright, and are ideal for longer viewing distances.
  • Brightness is a key element in designing your video wall and is measured by nits. Indoor LEDs typically have 1000-1500 nits while outdoor LEDs have 2000-3000 nits. A nit is almost 3.5 times brighter than a LUX, the measurement of brightness used by projector screens.
  • Pixel pitch is another important part of LED selection. Pixel pitch is the physical distance from the center of one pixel to the next, measured in millimeters. The higher the number, the fewer pixels, and lower resolution. Depending on viewing distance, you’ll need to determine the right pixel pitch for optimal resolution. A general rule is 3.28 feet per 1mm of resolution.
  • Cost and budget are always a consideration. LEDs have a higher initial investment than projectors but last much longer.

Finding the Right Video Wall Equipment for Your Project

If you aren’t an AV expert, selecting the right LED video wall may seem difficult. It’s important to educate yourself on the basics of LED screens, as provided above. This gives you a foundation to begin your search. As you work with those that have specific expertise, like VISIONPI, you’ll know the right questions to ask about pixel pitch, brightness, and longevity.

To narrow down your selection, ask these questions:

  • How will you use the display? Does it need to be the central element in a setting? Or is it a backdrop?
  • Are you using the displays inside or outside?
  • Will it be viewed from long or short distances?
  • How will it be mounted? Does the area require a certain shape or curvature of the screen?

Depending on your answers, you can narrow down exactly what you need to bring your ideas to life.

Products for Every Video Wall

VISIONPI has a large variety of award-winning LED displays. We can create nearly any size or shape screen required. From indoor to outdoor to curved configurations, there’s a perfect product for every installation.

You may have specific goals for your video walls—attracting attention, upselling, increasing curb appeal—and our team of experienced professionals will help you reach that goal. As a full-service LED provider, we collaborate with customers creatively to ensure the best experience.

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LED PIXEL PITCH

Mar 24, 2021 | knowledgebase | 0 comments

LED PIXEL PITCH

To learn what pixel pitch is and why it matters, you first have to know what a pixel is. You may think you already know what a pixel is, but a lot of people find out there’s more to the “pixel” than they originally thought. A pixel is a cluster of colored light sources, and this cluster almost always contains at least one red, green, and blue light source

Many people mistakingly think that each little “light” or diode is a pixel. The full pixel is the entire cluster of the red, green, and blue lights. Pixels can be in a triangle pattern as seen here:

led pixel pitch

Pixels can also be very tightly arranged in a small SMD’s. SMD stands for Surface Mount Diode. Each little SMD you see in this picture has very tiny red, green, and blue light sources inside each one. SMD’s are now almost universally used for new high resolution LED screens.

high quality nationstar smd 3535 2727 

Now that you know what a pixel is, let’s talk about why it matters.  Pixel pitch is the distance from one pixel to the next pixel beside it, above it, and below it. So, if your entire LED wall is said to have a 10mm pixel pitch, then that means there is 10mm of space from the center of one pixel (red, green, blue diode cluster) to the center of it’s neighboring pixel. Which, in quick American conversion, is 3/8 of an inch. As you can imagine, the smaller the pixel pitch, the tighter the resolution or the closer you can be to the screen before you can make out individual diodes in the image.

Now that you know what  pixel pitch is, here’s quick way to start thinking about what pixel pitch would be right for your LED screen. Take the distance that your closest audience will be from the screen, in feet, remembering to account for height distance as well, then half that number and that should give you a good estimate of the pixel pitch range you should be looking at. For example, if your closest viewer is going to be 20 feet away from the screen, then you should be looking in the 10mm or lower set of products to ensure that even the closest audience member will see a nice, clean, blended picture with little to no pixelation. Remember, all you have to do is half the distance in feet from your closest viewer and that’s your ideal pixel pitch. If your closest viewer will get no closer than 40 feet from your video wall, you can even use 16mm or 20mm pixel pitch and still get a great looking picture.

LED Display Wiring Bondings

Apr 10, 2020 | knowledgebase, Technology | 0 comments

What is wire bonding?

The conductor and wire bonding in the package is the apparatus that transfers electric current from the circuit board to the diodes. Conductors are located on the underneath or back side of the package carrier and consist of an anode and cathode division (positively and negatively charged). These pieces are manufactured from one of three different metals – Gold, Copper, silver, or even Iron. Copper Wire bonding refers to the wire bonding process that employs copper wires for interconnection, instead of the gold and aluminum wires traditionally used in semiconductor packaging.

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LED architecture and design concepts

Wire bonding material

There are variances in both conductivity and environmental performance with these three metals.

Gold is the preferred metal for both situations, having both the best conductivity and being the most environmentally resistant – but as expected it is also the most expensive.

Silver/ Iron is the most susceptible to corrosion and Copper is not gold and it is unreasonable, given the different physical and chemical characteristics of each metal, to expect copper simply to bond in the same way as gold. From a performance point of view, copper can be as reliable as gold wire but copper is facing problems in more challenging stress tests such as temperature cycling, If you are in an indoor environment naturally this isn’t usually a concern with controlled, low-humidity.

For this moment, gold wire still is the more stable one for the LED display. While larger-diameter copper wire has been utilized in many applications for some considerable time, the copper bonding wire is not a ‘drop-in’ solution for gold wire and should not be seen as such in fine and ultra-fine pitch applications. Copper wire from different suppliers can differ considerably in purity and mechanical properties during the process. That is why, for small pixel pitch, normally Gold wire is adapted.

How to Choose Between Copper and Gold Wire Bonding for LED Video Displays

Copper VS Gold Copper Wire bonding refers to the wire bonding process that employs copper wires for interconnection, instead of the gold and aluminum wires traditionally used in semiconductor packaging. Copper is rapidly gaining a foothold as an interconnection material in semiconductor packaging because of its obvious advantages over gold. These advantages include:

wiring bonding engineering tensile stress
  • 1) Cost reduction of up to 90%;
  • 2) superior electrical and thermal conductivity;
  • 3) less intermetallic growths;
  • 4) Copper also has about 25% higher thermal conductivity than gold ,greater reliability of the bond at elevated temperatures;
  • 5) higher mechanical stability

 

 

  • The disadvantages of copper wires versus gold wires include the following:
  • 1) copper tends to undergo oxidation at relatively lower temperatures;
  • 2) the hardness of copper wire require bonding parameter (bond force and ultrasonic energy in particular) optimization to achieve effective bonding without causing cratering;
  • 3) copper wire introduces a few failure analysis difficulties; 
  • 4) being relatively new, copper wire bonding technology is not yet as well-understood as gold ball bonding technology.
gold copper led wiring bonding
Cu and Au bonding wire

Nationstar Gold wire bonding ReeStar Series

A. ReeStar ™ (“RS”), a high-end full-color display device launched in 2013, mainly has four models, is a high-end brand of indoor foreign star high quality LED screen, more than three years warranty, excellent performance can fully realize the led high-definition display, high contrast ratio, high waterproof, high reliability, low light decay and other requirements. requirements.

B. 7 Major Performance Advantages of RS

 •  a). Waterproof and moisture-proof: waterproof performance reaches IPX8 level; moisture-proof performance reaches MSL 2a level.

 •  b). Cold and thermal shock resistance: high bonding of packaging materials, -65℃~+150℃ cold and thermal shock without dead light.

 •  c). Anti-back pressure: meet the high refresh frequency demand, 85 ℃, 85% RH, simulated back pressure test without failure.

 •  d). Salt spray resistance: the use of a wide range of simulated seaside corrosive environment without dead lights.

 •  e). UV resistance: UV experiments accelerated aging outdoor simulation using 3 years, light decay is less than 20%.

 •  f). Low light decay: high temperature and high humidity accelerated aging simulation of outdoor use for 3 years, light decay <20%.

 •  g). High brightness: the highest brightness level in the industry.

C. RS’s 3 Major Appearance Advantages

 •  a). Matte surface, high contrast.

 •  b). Surface luminescence technology: turn point into surface, solve the problem of led glare.

 •  c). Low pin technology: high cup and short foot, easy for customers to fill glue and cover mask.

D. There Are 4 Main Models

RS-1921MBAR, RS-2020MBAM, RS-2727MWAS, RS-3535MWAR

Price difference between copper wire bonding and gold wire bonding

Copper is inherently 2 to 5 times cheaper than gold, so substituting gold wires with copper wires can realize tremendous annual cost savings for a semiconductor packaging company:

let’s do simple math, you will see how much difference in price among those LED of varied bonding material: For example： P10, 10,000 Pixels/sqm with Nationstar LED 3535: Gold wire: High brightness: 20USD/K Copper Wire: Normal brightness: 10 USD/K Iron Wire: 5USD/K So Basically you can see the price difference, gold wire is about twice of copper. When it comes to indoor LED with a smaller pixel, the price can be a huge difference. if you see P2 (250,000 pixels/sqm),nationstar gold wire 1010 is roughly 8 USD/K.while copper wire is 4 USD/K. so it is about 1000 USD more. Most of the time factories /salespeople won’t tell you about the wire bonding material, unless you ask, even you ask, they can lie, because this no way you can recognize the difference by your eyes. except for chemical lab testing. Visionpi has a long term partnership with Nationstar/Kinglight, we provide verification service to our customers.

Conclusion

copper and gold wire bonding are both widely used techniques for connecting LED chips to external circuits in the LED video display industry. Copper and gold wire bonding have distinct advantages and disadvantages based on their intended use. Copper wire bonding is an economical choice that offers high thermal conductivity but has limited lifespan and low electrical conductivity. On the other hand, gold wire bonding, which is more expensive, provides thin wires and high electrical conductivity while having low thermal conductivity. Ultimately, selecting between copper and gold wire bonding should be based on the specific needs and requirements of your LED video display project.

Verification Service:

Accurate information is the key to evaluating the quality and performance of any manufacturer’s LED DISPLAY. However, there are some manufacturers, who produce and sell LED MODULES in a large quantity, and they usually sell to other LED factories/companies.they are using mainly are iron wire bonding led (Mulinseng, HongSeng), for price sake. The competition is getting fiercer, there are small companies who sell inferior quality LED but claim to be a good one. Even now you know those brands and quality level. but you are unable to tell if it is real. After a few months running, the display will bleed you on the maintenance cost. Visionpi provides LED verification services, we can be your professional QC team to help you with the sourcing and inspection and bring lower purchase cost and guaranteed quality.check more our services.

COB LED VS Mini LED

Mar 25, 2019 | General | 0 comments

The packaging technology of LED display modules can be divided into two types, one is SMD (Surface Mounted Devices) and the other one is COB (Chip On Board).  4in1 LED is still a number of SMD. The comparisons of these two products are as follows:
I. Production Cost: As compared to the flip-chip COB module, the 4in1 LED module has more production workstations (as shown in the picture below), which increases production cost. In addition, the flip-chip COB module adopts the mass transfer method to set LEDs on PCB boards; however, the 4in1 LED module applies the traditional single-chip per transfer method to set LEDs on PCB board one-by-one. Thus, the production capacity is ten to hundred times different. The cost advantage of flip-chip COB module may help speeding up the construction and expansion of virtual production environments.

As compared to the flip-chip COB module, the 4in1 LED module has more production workstations

  • II. Display Performance: In terms of display performance, the area of the Flip-Chip is smaller on the PCB board, and the duty cycle of the substrate is increased. It has a larger light-emitting area, which can present a darker black field, higher brightness, and higher contrast.COB LEDs are precisely placed on PCB boards so that the flatness and accuracy of the module are outstanding. Moreover, the viewing angle of the flip-chip COB module is around 175°, which is wider than the 160° viewing angle of the 4in1 LED module, and there is no pixel granularity on the flip-chip COB module. In addition, the flip-chip COB module can effectively suppress the moiré effect.

 

  • III. Product Reliability:  Flip-Chip COB can achieve true chip-level spacing, reaching the level of Micro LED. This is because, from the perspective of the LED chip, the Flip-Chip does not require wire bonding, which breaks the pixel pitch limit of the formal chip and solves the problem of metal migration in the formal LED.

    LED surface of the flip-chip COB module is packaged with an integral epoxy resin mold to avoid oxidation; the exposed solder joints of the 4in1 LED module are susceptible to interference by water and oxygen.

  • Please refer to the following comparison table of product reliability. Comparing the various characteristics, the overall reliability of the flip-chip COB module is much better. It is more suitable for the film and TV industry that requires frequent disassembly and assembly of LED modules.
flip chip cob vs mini 4 in 1 led

In summary, from the perspective of production cost, display performance and product reliability, the flip-chip COB module is significantly better than the 4in1 LED module. As an upgraded product of formal COB, flip-chip COB is based on the advantages of formal COB ultra-small dot pitch, high reliability, and non-glaring surface light source. Further, improve the reliability, simplify the production process, better display effect, perfect near-screen experience, and real chip-level spacing can be realized.

Thesaurus of led display technology

Mar 24, 2018 | ledtips | 1 comment

LED PIXEL PITCH

LED display resolution

The number of distinct pixels in the respective dimension that can be displayed, generally mentioned as pixel per width × height, is the LED display resolution.

 

Pixel pitch

Pixel pitch is the distance from the center of an LED cluster (or pixel) to the center of the next LED cluster/pixel measured in millimeters. This is not necessarily the same as the pixel size, which refers to the size of an individual pixel. The shorter the viewing distance (closer shooting distance) the smaller pixel pitch is required.

 

Driver IC

The driver IC will control the LED. It will generate the PWM signals to have the LEDs display the required brightness. The modern driver IC’s use many advanced technologies to get the best possible performance out of the LED.

 

Receiving card

The receiver card is the link between the LED processor (with video input) and the driver ICs (connected to the LEDs, video output). Except for decoding and distributing the video signal, the Receiver card will do a lot of extra corrections, such as brightness, gamma, calibration, etc.

 

Color gamut

Color gamut is “the color triangle”. The larger the surface you can cover in this triangle with your LED panel, the more colors you can show.

 

Refresh rate

Refresh rate is how many times per second a frame is redrawn on the display. (Typically, 1920, 3840, 7680Hz)

 

Scan rate

Scan rate, also named scan mux or multiplexing. One driver IC output pin drives multiple LEDs. This is done by completing the circuit for each LED one by one (multiplexing). During one refresh cycle, all the LEDs will light up once. Typical scan rates are 16:1, 11:1, 8:1.

 

Contrast

Contrast is the difference in luminance or color that makes an object (or its representation in an image or display) distinguishable.

 

Frame rate

Frame rate is the number of frames per second. This is typically determined by the video source. (Typically, 24, 50, 60Hz)

 

Scan lines

Scan lines is the effect your eyes or the camera pick up when the refresh rate is too low. A camera is more sensitive than our eyes to pick up scanlines. Typically higher refresh rates are desirable and genlocking (synching) the refresh rates between the screen and camera may be needed.

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