The Four Levels of Chinese LED Display factories

visionpi manufacturing
  • Level 1: the recently-created and unstructured workshop; and the factories only make the assembly work with all the half-completed product purchased from other suppliers, there are thousands of factories like this.
  • Level 2: the semi-organized factory that got out of level 1 but is still struggling to keep quality & timing under control, they have SMT machines, they can produce led panels themself, and focus on the segmented market, like led poster, rental display, transparent.
  • Level 3: the factory that made big efforts to get organized, with the objective of pleasing large customers, and they usually with many years of experience and their own R&D team and overseas sales team. here we can name a few, chip show, GCL, SBC.Yestech.
  • Level 4: that rare birds like Yaham, Unilumin that applies Lean manufacturing, and that avoids level 3’s rigidity.

In this article, I am excluding Chinese state-owned enterprises, which are a breed on their own.

Most manufacturers are at level 1 or level 2:The 4 levels of Chinese manufacturers

Level 1: the unstructured led display workshop

Typical profile:

  • 0-50 workers, engaged in simple processing (often assembly);
  • Managed by the owner and his family;
  • Not mature quality system and quality control staff;
  • No ability or time to work on complex prototypes before production starts;
  • Focused only on “making production” fast and on the cheap;
  • Can accept small orders, as long as purchasing components in small quantity is possible;
  • Seldom works directly for export customers;
  • Count on other manufacturers or trading companies to get business.

Result: low costs and low MOQs, but needs to be followed very closely by customers.

Level 2: the semi-organized led display manufacturer

This category is a mixed bag. Some export 100% of their output and are very familiar with their market’s quality & safety standards. Others focus more on the domestic market or the most price-sensitive countries (Middle East, India…), and should be avoided by importers from North America and Europe.

Still, it is possible to draw a somewhat typical profile:

  • 50-100 workers
  • Has grown out of the “disorganized workshop” stage
  • Has had to hire a few professional managers because of the growing complexity of operations
  • Has had to hire a few QC employees, to avoid big disasters.
  • But still, low concern for quality among staff and managers (in most cases).
  • May have English-speaking salespeople if direct relationships with foreign customers is a goal.
  • May still get orders mostly from trading companies and other factories.

Result: costs are relatively low, and quality & timing are relatively unstable. The owner’s motivation for your orders still determines their reliability.

Level 3: the organized/Listed led screen manufacturer

Typical profile: 200+ workers, usually established before 2010 with decade experience.

They have tried hard to comply with demanding buyers’ requirements:

  • Every aspect of production is specified in detail;
  • Production is checked thoroughly by QC department;
  • Own R&D team and updating led
  • Hopefully, strong staff discipline to follow the system;
  • a team for export business,and 60-80% of their sales is come from exporting.

Result: few quality issues, but high indirect labor costs (QC, middle management) and low flexibility. Top 10 led sign board manufacturers

Level 4: the continuously improving led display manufacturer

Typical profiles:

  • Part of a large multinational group or a joint venture.
  • Midsize factory with a process-oriented/engineering-oriented general manager.
  • dedicated to segment markets, like transparent led display or soft led display.

They follow the lean model:

  • Regular improvements to material flow and to each process;
  • Errors are prevented or corrected at the source;
  • Staff is trained and supports the philosophy.

Result: high customer satisfaction (close to zero defects; production cycle below 5 days) and relatively low cost (high productivity of operators, limited QC staff, and rework).

Unfortunately, these companies are a very small minority. They usually don’t advertise themselves on B2B directories. They are very hard to find.

What kind of Chinese factories should you work with?

First, a couple of rules to keep in mind:

  • If you work with a supplier that is too large relative to your orders (e.g. you would occupy 1% of their annual capacity), you will be quoted high prices and given poor service.
  • If you work with a small supplier that cannot produce the quantities you order, they will be forced to subcontract production and you will probably be in for a disaster.

My general advice would be as follows:

  • If your orders are very small, you might need to work with a trading company/quality assurance team that will place your orders in a level 1 factory and follow production.
  • If your orders are large enough to work directly with a manufacturer, but not big enough to be interesting to big factories, go for level 2, but you will still need a final inspection service before the shipment to make sure everything settled.
  • If your order is considered large and even big companies actively fight for your business, go for level 3.
  • If you are in a very quality-sensitive market and you cannot afford even 1% of defects, spend time and search for level 4 (but you might not find any in your vertical).

Small importers tend to have the feeling that buying from a large factory is more expensive but more reassuring. There is some truth regarding the higher prices, but risks are not necessarily lower. the fierce competition makes the industry more of chaos. after all, the company needs to survive, if the price allows them little profit, they will have to find a way to saving the cost from the raw material. smaller companies who dedicated one or few product line can be a good one to work with. 

We believe the core comptiveness is on the supply chain managment of a whole supply chain not between companies. VISIONPI dedicated in the supply chain management since the very beginning of the led display industry,back to 2000. we works with hundreds to thousand of importers to make the full adavantage of the supply chain in china.our professionla quality control team and managing system allow us to take the most advantage of the supply chain to provide our cusotmer with the best products.

What do you think?

Factory Supplier Background Check

Are you sure your potential supplier is who they say they are? Visionpi does the due diligence to uncover the truth with a comprehensive background check. We‘ve all heard horror stories about ‘scammers’ posing as factories who take your money and disappear! This very real risk is heavy on a buyer’s mind when they‘re considering a potential supplier, especially for led display industry, hundreds of small factories bankrupted every year which is why Visionpi offers a supplier background check to vet potential suppliers for you. Our focus is on assuring that your supplier is legitimate (no scams), has their story straight, is offering competitive pricing, and is, more generally, a good match for your business. If you are afraid of being scammed or working with a middleman posing as a manufacturer, Visionpi’s supplier background check will flag suspicious signs and advise on how to dig deeper.

What is a supplier background check or ‘due diligence?

Visionpi’s supply chain specialist performs a thorough investigation to uncover the truth about a potential supplier, covertly interviewing them, fact-checking, and confirming that they’re a legitimate manufacturer who is capable of producing your order. It takes 5 working days to compile the report.

Why choose to perform background checks? Any importers who are afraid that their potential suppliers may misrepresent information about their company (including scammers, but also simply ‘creative sales people’) need to conduct supplier due diligence before agreeing to work with a new supplier.

What type of factory should this type of due diligence be performed on?

All potential suppliers’ factories of any size, prior to deciding to spend much time on boarding them and on developing products with them. When to perform these background checks? Usually, the best time to carry out any due diligence is after sending out Request for Quotation (RFQ) information, but before any samples are requested and orders are placed.

Why choose supplier management?

The main benefits we offer are strong planning (based on our experience), a state-of-the-art process for organizing your led display supply chain, good communication, close follow-up, and quick reporting. All this helps you, as the buyer, get what you need: Faster project completion at the expected quality and cost.

Who needs this solution?

If you don’t have a local office in China, and you need to fly back to Asia very often (or follow unhealthy sleep patterns), these are the signs that you need a team on the ground you can rely on. Many of our clients already work with an ‘agent’, a partner, or freelancer(s) on the ground. They work with Visionpi because they value some of our in-house competencies and processes.

What is performed in SM?

The very first step is setting up a plan that addresses your objectives and considers the realities of your supply chain in China. Your suppliers get into “just do it” mode at the snap of a finger. However, has someone paused and considered what is in your long-term interest?We listen to you, see what has worked and not worked with led display factories, and suggest an action plan as well as realistic objectives.Then, based on your needs, we propose the profile (bios) of a project manager that would best fit them. This project manager, together with his/her team, starts implementing the plan.

We have 4 teams composed of 1 project manager and several assistant managers.Our project managers are in close contact with your suppliers, using their language as well as their preferred communication tools (Wechat, QQ, etc.), in order to keep your projects moving.We also have a support team with individuals who specialize in laboratory testing, in sourcing, in procurement, and in export & logistics.We go to the factory when needed. Our project management team is located in 4 different areas(Beijing,Hu nan,guangdong,zhejiang) and our inspection & audit team is nearly all along the coasts of China (where 80% led display manufactures are in Guangdong province )

How is SM reported?

One of our project managers is in frequent contact with you and updates you all along (as your single point of contact). We typically use collaborative software such as Trello or Asana, to make communication as fluid as possible.You also get a weekly summary of the work done. What does it cost? We bill 30 USD an hour* for project management and supply chain-related work. As a guide, it is not uncommon for us to quote 10 hours for the first block of work.Expenses, if any, are charged separately.

LED Displays are Not the Same

LED displays are comprised of many components. Various commercial manufacturers around the world may or may not state these components in their quotations. You may see items such as framing, power supplies, controller cards, video processors, cabling, mounting/hanging points, or display interface units either included in the bottom line or broken out as separate line items in a quotation. One word of caution before we focus on the piece of the display with the most points of differentiation. If you are comparing pricing, make sure you are aware of all the components required to make the display operational in the environment for your solution, and make sure you’re comparing apples to apples when reviewing quotations. One bottom line price may include everything you need to be operational whereas a second may be the price just for the LED panels, you don’t want to find out the fact after the order sealed, at the end you are paying more.

LED Diode 

The core of led display LEDs are diodes – meaning they are semiconductors. They are the most important unit for a led display and takes on 50-60% of the total cost. The two main types of LEDs presently used for lighting and display systems are aluminum gallium indium phosphide (AlGaInP, sometimes rearranged as AlInGaP) alloys for red, orange, and yellow LEDs; and indium gallium nitride (InGaN) alloys for green, blue and white LEDs. Slight changes in the composition of these alloys change the color of the emitted light. The actual chips/dice/wafers of the (LED) manufacturing process are basically the same the world over. What makes one manufacturer’s diode better than another is basically the consistency of the manufacturing process, the predictable, repeatable processes rendering consistent yields. This is accomplished by rigid manufacturing standards, “Six Sigma” processes, purity of chemical elements, etc. Diode manufacturers in the industry gain a reputation for delivering consistent and reliable quality. If you’ve been in this industry for a minute or two, you know the names that always come up when discussing quality. One starts with an “N” and one starts with a “C”. That being said, there are other contract manufacturing companies whose process is being guided and refined by the display manufacturers, which are turning out diodes of comparable quality.

led display price and cost

Just as with any consumer or commercial goods we buy, the reason some products cost more than others owes to labor and shipping costs, and the quality of the materials used. There are cheap TVs at Walmart, and premium TVs at Best Buy. They do the same thing, but what’s inside the housing can be different. On a direct-light LED circuit board, is a grid of attached pixels – or the smallest addressable components on the display from the perspective of content delivery. These “pixels” typically are what is referred to in the industry as a “package” and as you might expect, given the name, these are comprised of several individual elements – all of which can be differentiators in the performance and efficiency of the display. The quality and type of wiring used, the circuit board backplates, the epoxies, and numerous other things affect the final price of display electronics, as well as performance and reliability.

The actual chips/dice/wafers of the (LED) manufacturing process is basically the same the world over. What makes one manufacturer’s diode better than another is basically the consistency of the manufacturing process, the predictable, repeatable processes rendering consistent yields. This is accomplished by rigid manufacturing standards, “Six Sigma” processes, purity of chemical elements, etc. Diode manufacturers in the industry gain a reputation for delivering consistent and reliable quality. If you’ve been in this industry for a minute or two, you know the names that always come up when discussing quality. like Nichia and Cree. There are other contract manufacturing companies whose process is being guided and refined by the display manufacturers, which are turning out diodes of comparable quality. Pay attention to the spec of the LEDs, even for those LEDs comes from the same vendor, they have different level quality, it mainly depends on the material and technology that made of LED: Wire bonding, Reflector, Glue.

Package Design

LED PACKAGE SMD

Package Quality

The actual chips/dice/wafers of the (LED) manufacturing process is basically the same the world over. What makes one manufacturer’s diode better than another is basically the consistency of the manufacturing process, the predictable, repeatable processes rendering consistent yields. This is accomplished by rigid manufacturing standards, “Six Sigma” processes, purity of chemical elements, etc. Diode manufacturers in the industry gain a reputation for delivering consistent and reliable quality. If you’ve been in this industry for a minute or two, you know the names that always come up when discussing quality. like Nichia and Cree. There are other contract manufacturing companies whose process is being guided and refined by the display manufacturers, which are turning out diodes of comparable quality. Pay attention to the spec of the LEDs, even for those LEDs comes from the same vendor, they have different level quality, it mainly depends on the material and technology that made of LED: Wire bonding, Reflector, Glue.

Bond Wire

Gold, copper, Iron The conductor and wire bonding in the package is the apparatus which, as you might suspect, transfers electric current from the circuit board to the diodes. Conductors are located on the underneath or backside 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, zinc, or silver. The lining within the diode’s package cavity on the front of the package is referred to as the reflector. This comes in variations of two colors – either black or white. As you might suspect, white or whiter colors of reflectors better reflect, and more efficiently channel, the light from the diode outward away from the package. Black or darker reflectors tend to absorb more of the light from the diodes. The actual shape of the reflector cavity has much to do with the quality of the image and brightness. learn more about wiring bonding material.

Reflector

This will be discussed further when we discuss fill ratios. While we’re discussing the coloration of the reflector, it is also a good time to talk about the face of the package itself. These also come in various gradients of white and black and serve a similar function as the reflector. As a general rule of thumb, both of these elements either serve to enhance brightness (whiter elements) or to enhance contrast (blacker elements). Black face LED packages typically are better when the preferred result is for greater image detail. White and lighter face LED packages are preferred when brightness is a key requirement for content delivery – such as combating hostile ambient light conditions. Package faces also come in different finishes, matte finishes, glossy, and variations in between. We’ve talked about all of the components of major differentiation within the LED package sans one.

Len

The lens. The lens of the package is comprised of an optically translucent sealer material – most commonly silicon – which fills the cavity housing the diodes. The lens composition, as you might guess, affects to a greater or lesser extent, the optical performance of the package. Counterintuitively, a certain amount of opacity within the lens material actually enhances overall image quality for the average human viewer with 20/20 vision.

LED Display Quality Inspection Checklists

LED Display quality control

led display inspection

Understand the LED Display Production Process

Step 1: Technical study

An exclusive professional department with more than a decade of experience in advertising LED screen manufacturing will thoroughly study your needs and the technical concepts required for a new order.

Step 2: Structural design

We will design the frames of a big LED screen to adapt to the features and sizes requested by you perfectly.

Step 3: Assembling of structural components

We will assemble the manufactured structure in such a way that there is no visual separation in the whole unit. All the inside pieces will be placed according to a pattern and perfectly aligned by laser.

Step 4: Electronic components

We will program the assembling of electronic and LED equipment to assure that only the parts corresponding to your order are used. This is one of the most complex and delicate tasks of the entire process. It is the most important phase of creating the LED advertising screen.

Step 5: Assembly of electronic components

We will assemble the circuits we manufacture to create complete panels, which are fully functional and capable of reproducing a full-color image.

Step 6: Tuning and adjustment

We will adjust the LED panels to light and chromatic levels to ensure that sharpness and color are the same in the entire LED advertising screen. To do this, we will use photoelectric sensors measuring chromatic patterns adjusting and memorizing each LED component.

Step 7: General assembly

We will assemble the structural frames and parts to form complete units capable of reproducing videos.

Step 8: Assembly test

We will activate the screen as a whole and carry out exhaustive testing. Once all the tests prove smooth functioning, we will proceed to the image management and control phase.

Step 9: Image test

We will reproduce several test videos during the image control phase. We will analyze the chromaticism and its quality level. Finally, we will tune everything to adjust the whole unit.

Step 10: High protection packaging

We will carefully pack the LED screen into a high-resistance package to ensure product protection during transportation.

LED Display Quality inspection Details

Quality control of LED display is a process of ensuring that the LED display screen meets the desired standards of performance, reliability, and color accuracy. There are several aspects of quality control of LED display, such as:

  • Defective pixels: Defective pixels are pixels that do not function properly or do not emit light at all. They can affect the overall appearance and quality of the LED display.
  • Uniformity: Uniformity refers to the consistency of brightness and color across the LED display. A good LED display should have uniform brightness and color without any noticeable variations or spots.
  • Color accuracy: Color accuracy refers to the ability of the LED display to reproduce the colors of the original content faithfully and realistically. A good LED display should have high color accuracy without any color distortion or deviation. To test for color accuracy, you can use some online tools such as [DisplayCAL], which is a graphical user interface for the display calibration and profiling tools of Argyll CMS, an open source color management system. You can also use a colorimeter or a spectrophotometer to measure the color gamut and color temperature of your LED display.
  • Sharpness: Sharpness refers to the clarity and detail of the images displayed on the LED display. A good LED display should have high sharpness without any blurriness or pixelation. To test for sharpness, you can use some online tools such as [Lagom LCD test], which is a series of test images that help you to adjust the settings of your monitor. You can also use some test patterns or images that have fine details and edges to check the sharpness of your LED display.
  • Viewing angle: Viewing angle refers to the angle at which the LED display can be viewed without losing image quality or color fidelity. A good LED display should have a wide viewing angle without any color shift or contrast loss. To test for viewing angle, you can use some online tools such as [Viewing Angle Test], which shows you how the colors and contrast change when you view your monitor from different angles. You can also use some reference images or videos that have various colors and contrast levels to check the viewing angle of your LED display.

quality led

Example of inspection checklists

A good checklist is central to managing quality

Managing quality is a bit like coaching a professional sports team. A big part of the job is about repeating the same thing over and over, to get the basics right.

If you buy a led display from a supplier located thousands of miles away and rooted in a different culture, There should be an order confirmation letter to the customer to check and sign back before arrange the productionyou really need to focus on the basics:

  1. Document your requirements.
  2. Make your requirements s specific and testable, so that they are ready to be used as an inspection checklist.
  3. Ensure your supplier, and especially the people who really count (their purchaser, their manufacturing staff, their quality staff), is aware of your requirements and commits to hitting them.
  4. Inspect products based on your checklist, and request rework/reproduction if needed..

How to organize a QC inspection checklist

First, you have to think of the best way to guide an inspector through the job. For LED DISPLAY inspection checklist, it generally involves:

  • LED Brand (verification, the resources, and the batch number) copper wire or golden.
  • Driving IC (Brand and model)
  • Power supply and receiving card
  • cables (pure copper)
  • special functions: calibration or high temperature resistant
  • performance( viewing angle, error rate,uniformity of color )
  • Appearance check
  • Package
  • Reliability testing

Then, at each stage, you need to think about what details to check. and what standard?

  • Were specific requirements given to the supplier? Go through those requirements that are really important.
  • Any safety or regulatory considerations? Definitely cover them.
  • Are aesthetics important? Define what to look at and what common issues are to be counted as defects.
  • Any function test, endurance tests, or any similar?

Once you know what needs to be checked, the most important questions are:

  • How to check this criterion, and what will consider a pass or a fail?
  • How many samples should I check for this point? (Some checkpoints take a long time and/or destroy samples, so smaller sampling sizes may make sense.)
  • What measuring/testing equipment will be necessary? Will the inspector bring it, or will the factory have to provide it?

LED Display Quality inspection service

VISIONPI QC is a Sino-foreign joint venture quality assurance, project management, and product engineering agency based in China. We are dedicated in A&V products for decades and our key focus is on transparency and control in your supply chain. We offer startups and SMEs the expert assistance you need on the ground in China to improve your relationship with, management of, and quality from your Chinese supply chain,We never hold any of your information for ourselves to ‘lock you in’ We work exclusively for you, and we share and investigate all the information we have in or out of our database for you.

led display inspection service

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