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What is COB LED Display Vs SMD LED Display?

by | Mar 21, 2024 | Blogs | 0 comments

Two leading contenders in the rapidly changing field of LED technology are COB LED and SMD LED displays. The way we interact with images has been completely transformed by these technologies, from colourful digital signage to captivating billboards. We explore the complexities of COB LED display technology in this piece and contrast it with SMD counterparts to reveal the secrets underlying their luminosity.



With the introduction of COB or Chip-On-Board, LED display technology has advanced significantly. This creative method outperforms conventional LED arrangements regarding seamlessness and captivating display, completely changing how we interact with images.

COB LEDs, in contrast to traditional LEDs, employ a novel technique in which several LED chips are integrated directly onto a single substrate. Combining these light sources results in a mighty small display that sets the stage for an unmatched visual experience. The core of COB LED technology is the cooperative power of these minuscule LED chips. The capacity of COB LED displays to produce breathtaking images from a variety of viewing angles is what makes them unique. Because of this, they are perfect for large spaces like arenas, stadiums, and auditoriums, where every seat ought to be the best in the house. COB LEDs are bright and uniform, so no matter how the viewer views the display, it will always be captivating.

The real power of COB LED walls is their capacity to do away with the infamous “pixilation” effect that frequently occurs in conventional displays. Conventional LEDs have a visually confusing grid pattern because visible borders separate the individual modules. These lines disappear thanks to COB LED technology, which creates a uniform, smooth appearance that enthrals viewers with realistic clarity.

Imagine a display with no visible lines or seams—that is what COB LED walls aim to achieve. A seamless and uninterrupted visual experience is produced by doing away with the boundaries that once separated individual LED modules. This improves the display’s visual appeal and makes watching it more engaging for the audience. With COB LED walls, you can see scenes play out on a canvas without being constrained by a pixelated grid.

The exceptional performance of COB LED displays at a variety of viewing angles is what makes them stand out. This feature becomes critical in large venues with dispersed audiences from various vantage points, such as stadiums, auditoriums, and arenas. Regardless of the viewer’s perspective, COB LEDs guarantee that every seat is the best in the house by providing consistent brightness and clarity.

COB LED displays to achieve uniformity that goes beyond appearances. The uniformity of brightness levels throughout the display surface prevents the uneven lighting frequently observed in conventional setups. Because of their uniformity, COB LED walls have a more significant overall visual impact and are, therefore, the recommended option for applications where a perfect display is required.

COB LED technology’s advantages become even more noticeable when dynamic and high-resolution content is displayed. COB LED displays are up to the challenge of displaying intricate visuals or a fast-paced sporting event, ensuring every detail is vividly and precisely rendered.

COB LED wall technology is a revolutionary advancement in the field of LED displays. In addition to eliminating visual flaws, consolidating LED chips onto a single substrate creates new opportunities for producing breathtaking visual experiences. COB LED displays are at the forefront of technological advancements, bringing brilliance to our surroundings and raising the bar for visual perfection.

Benefits of COB LED 


In addition to its eye-catching aesthetic appeal, COB LED technology offers many benefits that raise the bar for performance and efficiency in the lighting industry.

  • Energy Efficiency: COB LEDs are more energy efficient than conventional LEDs. They require less power to achieve comparable or superior brightness levels, resulting in significant energy savings.
  • Environmentally friendly: The reduced power consumption of COB LEDs is in line with the global trend towards sustainable technologies, making them an environmentally friendly lighting solution.
  • Durability: COB LEDs have a unified design that integrates multiple LED chips into a single substrate, minimizing the potential for malfunction and increasing overall durability.
  • Longer life: The rugged construction of COB LEDs contributes to their longevity, resulting in reduced maintenance requirements and costs over time.
  • Suitable for various environments: The rugged design of COB LEDs allows them to withstand the challenges of outdoor environments and high-traffic indoor areas, maintaining their performance with minimal maintenance.
  • Superior color rendering: COB LEDs are good at delivering brilliant and accurate color reproduction, enhancing the visual experience with vibrant colors and subtle gradients. This superior color fidelity is a testament to their advanced technology.

What is SMD LED Display? 

SMD led packaging

It is the abbreviation of Surface Mounted Devices, which is one of the SMT (Surface Mount Technology) components. At present, indoor full-color LED screens mainly use surface-mounted three-in-one SMD, which refers to the packaging technology that encapsulates SMT lamps of three different colors of RGB LED chips in the same colloid at a certain distance to assembly a LED display module.

SMD LED main process:

  • Package the LED light-emitting chip in the bracket to form a lamp bead (SMD surface mount component), and the lamp bead is then attached to the PCB board through soldering;
  • Put the surface mount parts and PCB board into a high-temperature oven for sintering and solidification (reflow soldering), then wire-weld the LEDs through pressure welding technology;
  • Use epoxy resin to dispensing and encapsulate the bracket to finally produce a LED display module. 

Core materials of SMD process:

  • Bracket: conducts electricity, supports and dissipates heat. It is mostly formed of the bracket material through electroplating. It is composed of five layers of material, copper, nickel, copper and silver from the inside to the outside.
  • LED chip: The chip is the main component of the LED Lamp and is a semiconductor material that emits light.
  • Conductive wire: Connects the chip PAD (soldering pad) and the bracket to enable conduction.
  • Epoxy resin: Protects the internal structure of the lamp bead and can slightly change the luminous color, brightness and angle of the lamp bead;

Advantages and disadvantages of SMD LED Display


  • Compact Packaging: SMD LED displays have a smaller package size, resulting in a thinner overall display.
  • Easy Installation: Installation is facilitated through surface-mount technology, making the process straightforward.
  • Wide Viewing Angle: Suitable for viewing from multiple directions, offering a broad viewing angle.


  • Potential Display Effect Impact: The relatively small spacing between the LEDs may affect the display quality.
  • Heat Dissipation: SMD LEDs do not dissipate heat as efficiently as DIP (Dual In-line Package) LEDs.

SMD vs. COB Packaging Technology


The decision between SMD (Surface Mount Device) and COB (Chip-On-Board) packaging technologies brings about a fundamental difference in design philosophy and manufacturing processes in the complex world of LED display construction.

SMD LEDs are installed individually on the display board and are distinguished by their unique packaging. Because of its modularity, designers can create more complex and imaginative designs. Nevertheless, the cost of this flexibility is apparent seams between individual modules. Even though the lines are often subtle, they can affect the overall coherence of the image, especially in displays where a smooth transition is essential.

Conversely, COB LEDs transform the environment by assembling several LED chips onto a single board. This consolidation changes everything by removing the apparent seams, which can be problematic in SMD configurations. The production process is more straightforward, and visual continuity is improved when LED chips are integrated into a single substrate. The lack of separate modules simplifies the build, giving the exhibit the appearance of being one seamless piece.

The advantages of COB LEDs go beyond aesthetics into the domain of usefulness thanks to their unified design. Comparing a COB LED display to an SMD counterpart; the setup procedure is more straightforward. Time and effort can be saved during installation thanks to the fewer parts and lack of seams. This construction’s simplicity is beneficial when quick deployment or frequent display reconfiguration are necessities.

The decision between SMD and COB packaging technology ultimately comes down to balancing visual seamlessness and design flexibility. SMD LEDs support a variety of layouts, satisfying the needs of those who value complex designs. COB LEDs, on the other hand, promote a smooth and efficient method that makes the manufacturing and installation procedures easier while producing a visually harmonious and uninterrupted display. The choice ultimately comes down to the particular requirements and project priorities.

Here’s a quick guide on the differences between COB (Chip on Board) and SMD (Surface Mounted Device) LED display:

Image Display EffectCOB displays are surface light sources offering better visual quality with no graininess, making them ideal for prolonged close-up viewing.
They provide higher contrast and more vivid colors similar to LCD displays, with superior detail. However, COB displays have good color variations when viewed at an angle due to the uniformity of light.
SMD displays are point light sources. While they allow for close matching of optical performance across individual LEDs, they may appear grainy up close.
Stability and MaintainabilityCOB screens have better overall protection (up to IP65), allowing for cleaning with a damp cloth. However, they cannot be repaired on-site and require factory returns for maintenance due to the comprehensive coating.SMD screens have weaker overall protection, making them prone to physical damage and less resistant to water and dust.
They cannot be wiped clean but offer easier on-site repair, facilitating maintenance.
Power Consumption and EfficiencyCOB uses flip-chip technology that allows for unobstructed light emission, resulting in lower power consumption for the same brightness levels, making them more economically efficient. The transparency of the coating used in COB also contributes to its efficiency.SMD typically employs top-emitting technology with leads that may obstruct light, leading to higher power consumption. The epoxy resin used in SMD packaging has lower light transmission, affecting efficiency.
CostCOB technology has a higher production threshold and is less widely adopted, with fewer than twenty manufacturers capable of R&D and manufacturing. Theoretical costs are lower than SMD, but practical costs remain higher due to lower yield rates.SMD technology is more complex but widely adopted due to its lower technical barrier. It is more mature, with the majority of manufacturers using this technology, leading to potentially lower costs.

SMD vs. COB LED Dispay: Which Is Better 


Choosing a COB (Chip-On-Board) or SMD (Surface Mount Device) LED display depends on the particular needs and preferences of the targeted application.

SMD LEDs perform exceptionally well in situations where design flexibility is crucial. Because of their modular design, which enables creative configurations, they are the best option for displays that call for complex layouts or unusual shapes. Whether a curved display or a design that deviates from the traditional grid, SMD LEDs offer the adaptability required to realise imaginative ideas.

Conversely, COB LED displays steal the show if seamless images and ideal viewing angles are the main priorities. COB LEDs have a consolidated design that removes the spaces between modules, giving the appearance of a single, continuous display. This feature is beneficial in applications where a smooth and consistent visual experience is essential. COB LED technology is the best option in situations where the overall aesthetic impact is crucial because it is excellent at producing displays that enthral audiences with continuous visuals.

Ultimately, the choice between COB and SMD LED displays is a complex one that is influenced by the particular requirements of the project. SMD LEDs are ideal for people who value design flexibility, but COB LEDs are the best choice when a smooth and eye-catching display is the main objective. Finding the perfect balance between pursuing a faultless viewing experience and design creativity is crucial in making the right decision.

Related Article:

What are GOB LED Display and COB LED Display?

Why Choose DOITVISION COB LED Display?

COB LED display

For those looking for high-quality, durable and efficient visual solutions, when you choose DOITVISION COB LED screens, it means you are investing in cutting-edge display technology at a more affordable price.

DOITVISION promises that all key components such as power supplies, adapter boards, receiving cards, and modules will use reliable connectors, which not only facilitates hard connection and improves stability, but also facilitates all-round maintenance. With it, you can significantly simplify the installation and maintenance process. With Excellent visual quality, durability and user-friendly maintenance, it is a priority solution for high-definition LED screens.

Physical Pixel Pitch≤1.25mm, with a pixel density of ≥640,000 pixels/m², offering high-resolution images with incredible detail.
Packaging TechniquePure flip-chip COB packaging without leads, resulting in a smooth and even surface.
Cabinet MaterialMade from full die-cast aluminum, ensuring no visible defects like dents, scratches, or corrosion, with clear and intact labeling.
MaintenanceDesigned for full-front maintenance using gold-plated connectors for easy disassembly and support for wall-mounted installations without the need for a maintenance aisle.
Brightness AdjustmentBrightness is adjustable from 0 to 2000 nits, with a deviation of less than 20 nits from software indications to measured values.
UniformityBrightness uniformity of ≥99.5% and chromaticity uniformity within ±0.001Cx,Cy.
Contrast Ratio≥25000:1, offering deep blacks and vivid colors for a striking visual experience.
Refresh Rate≥3840Hz, with a frame-changing frequency of ≥60Hz, ensuring smooth playback without ripple or flicker, even under professional camera capture.
SynchronizationSynchronization between different receiving cards is within 10ms for cohesive display performance.
Energy EfficiencyUtilizes a fanless design for the power supply with PFC (Power Factor Correction) for enhanced energy efficiency.


COB and SMD technologies have strong points in the dynamic field of LED displays. COB LED shows raise the bar for the ideal viewing experience with flawless integration and captivating visuals from multiple angles. The unified design simplifies the frequently complex installation and maintenance procedures while improving aesthetics.

Conversely, SMD LED displays find a niche in applications where flexibility in design is paramount. SMD LEDs’ modular design facilitates creative configurations, meeting the needs of projects requiring complex layouts and unusual shapes. However, selecting between COB and SMD is a strategic choice that is specific to each project’s requirements, not just a question of personal taste.

The choice between COB and SMD LEDs becomes increasingly crucial as LED technology advances, and we seek to create visually striking experiences that will stick in our memories. The way we view and interact with digital visuals is changing due to LED technology, which is illuminating our world with its seamless brilliance of COB and its intricate modularity of SMD. Every technological advancement significantly contributes to a future where visual intelligence is limitless in this constantly changing landscape.

About the Author

Kris Liang

Kris Liang

Founder/LED display expert

Kiris Liang is the founder of Doitvision. 12 + years in LED visual industry. Full passion of LED, product designer & chief salesman. Looking for teammate of technical/ marketing / sales.

Connecting people relative with LED displays.

Email: kris@doitvision.net