Ultimate Introduction of GOB LED – All Things You Need to Know

Ultimate Introduction of GOB LED – All Things You Need to Know

GOB LED – one of the most advanced LED technologies in the industry, is conquering increasing market share worldwide for its unique features and advantages. The prevailing trend not only comes from the new evolutionary direction it brings to the LED industry but also tangible benefits of the products to customers.

So, what is GOB LED display? How can it benefit you and bring more revenues for your projects? How to choose the right products and manufacturers? Follow us in this article to have more insights.

Part one – What Is GOB Tech?

Part Two – COB, GOB, SMD? Which One Is the Best for You?

Part Three – Benefits and Drawbacks of SMD, COB, GOB LED Display

Part Four – How to Make A High-quality GOB LED Display?

Part Five – Why You Should Choose GOB LED?

Part Six – Where Can You Use GOB LED Screen?

Part Seven – How to Maintain GOB LED?

Part Eight – Conclusions

Part one – What Is GOB Tech?

GOB stands for glue on board, which applies a new packaging technology to ensures higher protection ability of LED lamp light than other types of LED display modules, aiming at improving the waterproof, dust-proof and anti-crash functions of LED modules.

By using a new kind of transparent materials to package the PCB surface and packaging units of the module, the whole LED module is able to resist UV, water, dust, crash and other potential factors that may cause damages to the screen better.

What’s the Purpose?

It is worth to be highlighted that this transparent material has high transparency to ensure visibility.

Besides, because of its outstanding protection functions, it can be widely used for outdoor applications and indoor applications where people can access the LED screen easily such as elevator, fitness room, shopping mall, subway, auditorium, meeting/conference room, live show, event, studio, concert, etc.

It is also suitable for flexible LED displays and can own excellent flexibility for accurate screen installation based on the structure of the building.

Part Two – COB, GOB, SMD? Which One Is the Best for You?

There are three prevailing LED packaging technologies on the market – COB, GOB and SMD. Each of them has their own features and advantages over the other two. But, what are the details, and how to choose when we facing these three choices?

To figure out this, we should begin with knowing the differences in a simple manner.

Concepts and differences of the Three Technologies

1.SMD technology

SMD is the abbreviation of Surface Mounted Devices. LED products encapsulated by SMD (surface mount technology) encapsulate lamp cups, brackets, wafers, leads, epoxy resin, and other materials into lamp beads of different specifications.

Then, using a high-speed placement machine to solder the LED lamp beads on the circuit board to make LED display modules with different pitches.

With this technology, the lamp beads are exposed, and we can use a mask to protect them.

2.COB technology

On the surface, COB sounds similar to GOB display technology, but it has a long history of development and has recently been adopted in promotional products of some manufacturers.

COB means chip on board, it integrates the chip directly to the PCB board, which can improve the efficiency of packaging and narrowing the distance between different lamp lights. To avoid pollution and damages to the chips, the producer will package the chips and bonding wires with glue.

Though COB and GOB are seemly same as the lamp beads will all be packaged by transparent materials, they are different. The packaging method of GOB LED is more like SMD LED, but by applying transparent glue, the protection lever of LED module gets higher.

3.GOB technology

We have discussed the tech principles of GOB before, so we will not go into details here.

4.Comparison Table

Part Three – Benefits and Drawbacks of SMD, COB, GOB LED

1.SMD LED Display

Pros:

(1)High color fidelity

SMD LED display has high color uniformity that can achieve high color fidelity. The brightness level is appropriate, and the display is anti-glare. It can serve as advertising screens for both indoor and outdoor applications well, and also the predominant type of LED display industry.

(2)Energy-saving

The power consumption of single LED lamp light is comparatively low from about 0.04 to 0.085w. Though it does not need much electricity, it can still achieve high brightness.

(3)Reliable and solid

The lamp light is potted with epoxy resin, which brings a solid protection layer to components inside. So it is not easy to be damaged.

Besides, the placement machine is advanced to make the soldering accurate and reliable so as to ensure the lamp lights are not easy to apart from the board.

(4)Quick response

No need for idling time, and has a quick response to the signal, and can be widely used for high-accurate tester and digital displays.

(5)Long service life

The common service life of SMD LED display is 50,000 to 100,000 hours. Even you put it under running for 24 hours, the working life can be up to 10 years.

(6)Low production cost

As this technology has been developed for many years and has been rolled out in the whole industry so the production cost is relatively low.

Cons:

(1)Protection ability waiting for further improvement

The functions of anti-moisture, waterproof, dust-proof, anti-crash still have the potentials to be improved. For example, deadlights and broken lights can happen frequently in a humid environment and during transportation.

(2)Mask can be sensitive to the changes in the environment

For instance, the mask may plump up when the surrounding temperature is high, affecting the visual experiences.

Besides, the mask may be yellowing or turn white after using a period of time, which will degrade the viewing experiences too.

2.COB LED Display

Pros:

(1)High heat dissipation

One of the aims of this technology is to deal with the problem of heat dissipation of SMD and DIP. The simple structure gives it advantages over the other two types of heat radiation.

(2)Suitable for small pixel pitch LED Display

As the chips are directly connected to the PCB board, the distances between each unit are narrow so as to decrease the pixel pitch to provide customers with clearer images.

(3)Simplify the packaging

As we mentioned above, the structure of COB LED is simpler than SMD and GOB, so the packaging process is relatively simple, too.

Cons:

As a new technology in LED industry, COB LED has had not enough experience of being applied in small pixel pitch LED displays. There are still many details that can be improved during production, and production costs can be lowered by technological progress in the future.

(1)Poor consistency

There is no first step for selecting the light beads, resulting in poor consistency in color and brightness.

(2)Problems caused by modularization

There may be problems caused by modularization as high modularization can result in inconsistency in color.

(3)Inadequate surface evenness

Because each lamp bead will be potted glue separately, the surface evenness can be sacrificed.

(4)Difficult maintenance

The maintenance needs to be operated with special equipment, leading to high maintenance costs and difficult operation.

(5)High production cost

As the reject ratio is high, so the production cost is higher than SMD small pixel pitch LED a lot. But in the future, the cost can be lowered with the corresponding technology developing.

3.GOB LED Display

Pros:

(1)High protection ability

The most outstanding feature of GOB LED is the high protection ability which can prevent the displays from water, humidity, UV, collision, and other risks effectively.
This feature can avoid large-scale dead pixels and broken pixels.

(2)Advantages over COB LED

Compared with COB LED, it is easier to maintain and has lower costs of maintenance.

Besides, the viewing angle is wider and can be up to 180 degrees both vertically and horizontally.

Moreover, it can solve the bad surface evenness, inconsistency of color, high reject ratio of COB LED display.

(3)Suitable for applications where people can access the screen easily.

As the protective layer covering the surface, it can deal with the problem that unnecessary damages caused by people such as falling down of the lamp beads especially for LED lamps placed on the corner.

For example, screen in elevator, fitness room, shopping mall, subway, auditorium, meeting/conference room, live show, event, studio, concert, etc.

(4)Suitable for fine pixel LED display and flexible LED display.

This type of LEDs are applied mostly on small PP LED screen with pixel pitch P2.5mm or below now, and also is suitable for LED display screen with higher pixel pitch, too.
Besides, it is also compatible with flexible PCB board and can meet the high requirements for high flexibility and seamless displaying.

(5)High contrast

Due to the matt surface, the color contrast is improved so as to increase the play effect and wider the viewing angle.

(6)Friendly to naked eyes

It will not emit UV and IR, and also radiation, which is safe to people’s naked eyes.
Besides, it can protect people from the “blue light hazard”, as blue light has a short wavelength and high frequency, which may lead to damages to people’s eyesight if watch it for a long time.
Moreover, the materials it uses from LED to FPC are all environment-friendly and recyclable that will not cause pollution.

Cons:

(1)As a typical type of LED display applies for stents packaging technology as SMD LED displays, there is still a long journey for it to take to solve all existing technical problems such as better heat dissipation.

(2)The property of glue can be improved further to raise the glue force and inflaming retarding.

(3)No reliable outdoor protection and anti-collision capability for outdoor transparent LED display.

Now, we know the differences between the three common LED screen technology, you may have already known GOB has many advantages as it includes the merits of both SMD and COB.

Then, what are the criteria for us to choose the right GOB LED?

Part Four – How to Make A High-quality GOB LED Display?

1.Basic Requirements for A High-quality GOB LED

There are some strict requirements for the production process of GOB LED display that must be met:

(1)Materials

The packaging materials must have features like strong adhesion, high stretching resistance, adequate hardness, high transparency, thermal endurance, good abrasion performance and so on. And it should be anti-static and can resist high pressure to avoid the shortening of service life because of crash from outside and static.

(2)Packaging process

The transparent glue should be padded accurately to cover the surface of lamp lights and also fill in the gaps fully.
It must adhere the PCB board tightly, and there should not be any bubble, air hole, white point, and gap which is not filled with the material totally.

(3)Uniform thickness

After the packaging, the thickness of the transparent layer must be uniform. With the development of GOB technology, now the tolerance of this layer can be almost neglected.

(4)Surface evenness

The surface evenness should be perfect without irregularity like small pot hole.

(5)Maintenance

The GOB LED screen should be easy to maintain, and the glue can be easy to move under special conditions to repair and maintain the rest part.

2.Technical Key Points

(1)The LED module itself should be composed of high-standard components

The packaging of glue with the LED module put forward higher requirements for PCB board, LED lamp beads, solder paste and so on.
For instance, the thickness of PCB board must reach at least 1.6mm; the solder paste needs to reach a specific temperature to ensure the soldering is rigid, and the LED lamp light needs to have high quality such as lamp beads produced by Nationstar and Kinglight.
The high-standard LED module before the potting is one of the key factors to achieve the high-quality final product as it is the prerequisite for the packaging process.

(2)Aging test should last for 24 hours

The LED display module before potting glue only needs aging test that lasts for four hours, but for our GOB LED display module, the aging test should last for at least 24 hours to ensure stability so as to decrease the risks of reworking as much as possible.
The reason is straightforward – why not ensure the quality at first, and then pot the glue? If the LED module happens with some troubles such as dead light and fuzzy displaying after packaging, it will cost more energy to repair it than launching the aging testing thoroughly.

(3)The tolerance of trimming should be less than 0.01mm

After a series of operations such as fixture comparison, glue filling, and drying, the overflowing glue on the corners of GOB LED module needed to be cut. If the cutting is not precise enough, the lamp feet may be cut down, resulting in the whole LED module becoming a reject product. That is why the tolerance of trimming should be less than 0.01mm or even less.

Part Five – Why You Should Choose GOB LED?

We will list the main reasons for you to choose GOB LEDs in this part, maybe you can be convinced better after making clear the distinctions and advanced features of GOB considered from a technical level.

(1)Superior protective capability

Compared with traditional SMD LED displays and DIP LED displays, GOB tech fosters higher protection capability to resist water, humidity, UV, static, collision, pressure and so on.

(2)Improved consistency of ink color

GOB improves the consistency of ink color of the screen surface, making the color and brightness more uniform.

(3)Great matt effect

After the dual optical treatment for the PCB board and SMD lamp beads, great matt effect on the screen surface can be realized.

This can increase the contrast of displaying to perfect the final image effect.

(4)Wide viewing angle

Compared with COB LED, GOB extends the viewing angle to 180 degree, allowing more viewers to reach the content.

(5)Excellent surface evenness

The special process guarantees excellent surface evenness, which contributes to the high-quality display.

(6)Fine pixel pitch

GOB displays are more suitable for high-definition images, supporting pixel pitch under 2.5mm such as P1.6, P1.8, P1.9, P2, and so forth.

(7)Less light pollution to people

This kind of display will not emit blue light which may damage people’s naked eyes when the eyes receiving such light for a long time.

It is quite helpful to protect the eyesight, and for customers who need to place the screen indoor as there is only close viewing distance for viewers.

Part Six – Where Can You Use GOB LED Screen?

1.The types of displays that GOB LED modules can be used for:

(1)Fine pixel pitch LED display

(2)Rental LED display

(3)Interactive LED display

(4)Floor LED display

(5)Poster LED display

(6)Transparent LED display