What is SMD?
The traditional SMD technical route packages one each of red, green and blue (RGB) LED chips into an individual LED bead. These beads are then soldered onto the PCB via SMT pick-and-place with solder paste to form unit modules, which are finally assembled into a complete LED display screen.
What is COB?
COB is the abbreviation for Chip on Board. It refers to directly soldering multiple RGB LED chips onto a single PCB, followed by integrated film encapsulation to form unit modules, which are then assembled into a complete LED display screen.
COB packaging is divided into face-up and flip-chip types. For face-up COB, its viewing angle and wire bonding distance inherently limit the performance improvement of the product from the perspective of technical route. As an upgraded version of face-up COB, flip-chip COB delivers higher reliability, simplifies manufacturing processes, achieves superior display performance and excellent near-screen viewing experience. It enables true chip-level pitch down to Micro LED level, and outperforms traditional SMD products in terms of high brightness, high contrast, black uniformity and display stability.
Unlike SMD displays, COB panels cannot sort individual beads by similar optical properties, so full-panel image calibration is required before factory delivery.
With advances in industry technology, the cost of COB packaging is trending downward. According to InfoLED data, for P1.2 pitch products, COB solutions are already cheaper than SMD alternatives, and the price advantage becomes even more prominent for finer-pitch products.
What is MIP?
MIP stands for Mini/Micro LED in Package. It refers to cutting the light-emitting chips on the LED panel into single-device or multi-in-one components. After optical sorting and color mixing optimization, these components are soldered onto the PCB via SMT pick-and-place with solder paste to produce LED display modules.
This technical concept embodies the idea of "breaking the whole into parts". Its advantages include smaller chip size, lower power loss and superior display uniformity. It has the potential to reduce costs and greatly boost production volume, improving the performance and efficiency of LED display devices.
The MIP solution implements pixel full testing and mixes BIM within the same grade to achieve color consistency, reaching cinema-grade color gamut standards (DCI-P3 ≥99%). During optical sorting and color grading, defective units are screened out and removed. This guarantees the yield of every pixel upon end transfer and lowers rework costs. Furthermore, MIP features excellent compatibility. It adapts to different substrates and various pixel pitches, and supports medium and large-size Micro LED display applications.
What is GOB?
GOB stands for Glue on Board. It was developed to meet higher requirements for product quality and display performance, commonly known as front-side potting.
The emergence of GOB caters to market demands and features two major advantages. First, GOB delivers an ultra-high protection rating, offering resistance against water, moisture, impact, dust, corrosion, blue light, salt and static electricity. Second, thanks to its matte surface, it converts display from point light sources to area light sources. This widens the viewing angle, improves color contrast, effectively eliminates moiré patterns, reduces eye strain and achieves a finer display effect.
In summary, SMD, COB and MIP packaging technologies each have their own strengths and weaknesses. It is critical to select the appropriate technology according to different application scenarios and requirements. LP DISPLAY provides a full range of product lines and holds multiple international and domestic patents. With extensive project experience in fine-pitch LED displays, LP DISPLAY is committed to empowering more scenarios with a richer, smarter portfolio of new display products. Our products are widely deployed in command centers, security monitoring, commercial advertising, sports venues, home cinemas, virtual production and many other industries.
With technological breakthroughs and continuous cost reduction, Mini & Micro LED will gain wider applications across more sectors. The current choice between the popular COB and MIP is more of differentiation rather than replacement. LP DISPLAY selects optimal solutions based on diverse customer requirements. Please feel free to leave comments for discussion if you have more insights or demands.
What is DIP?
Dimension | DIP (Dual In-line Package) | SMD (Surface-mount) | COB (Chip on Board) | MIP (Micro/Mini LED in Package) |
Core principle | RGB chips are packaged into leaded lamp beads that penetrate through the PCB for soldering — a traditional outdoor process | RGB chips are individually packaged into standalone lamp beads that are surface-mounted onto the PCB — the most mature and widely used industry process | Bare LED chips are die-bonded and soldered directly onto the PCB, then encapsulated as a whole with glue/coating — no standalone lamp bead structure | Multiple Mini LED chips are first integrated into a single pixel unit, then SMT-mounted onto the PCB — positioned between SMD and COB |
Image quality | Narrow viewing angle, strong grainy look, generally inconsistent color uniformity; not suitable for close viewing or filming | Stable image quality and uniform colors; small pitches are prone to moiré, with limited fineness at close range | Extremely fine picture, seamless and flat, no moiré, high contrast — best result for filming | Extremely fine picture, seamless and flat, no moiré, high consistency and contrast — best result for filming |
Protection | Sturdy lamp bead structure, extremely high brightness, strong weather resistance — waterproof and sun-proof | Bare module protection is average; can be paired with GOB glue-filling to improve dust/water resistance and impact resistance | Fully sealed with glue fill — dust-proof, waterproof, impact-proof and static-proof; highest protection rating | Integrated package structure; better protection than standard SMD, slightly lower than COB |
Maintenance | Individual lamp bead replacement supported — simple, extremely low cost | Individual lamp bead replacement supported — easy maintenance, lowest after-sales cost | No single-lamp repair; dead pixels require replacing the entire module — high after-sales cost | Component-level repair without replacing the whole module — easier than COB, better than SMD |
Cost | Low cost, old but mature process | Best cost-performance; mature mass production, overall most cost-effective | Complex process, low yield, highest overall cost | Medium-high — higher than SMD, lower than high-end COB |
Applicable pitch | Large pitches only: P8 / P10 and above | Standard pitches: P1.25–P10 (cannot stably go below P1.0) | Ultra-small pitches: P0.9 and below (high-end micro-pitch) | Fine pitches: P0.6–P1.2, perfectly bridging the gap between SMD and COB |
Application scenarios | Outdoor long-distance large billboards, traffic information displays, outdoor high-brightness large screens | General indoor/outdoor advertising screens, conference rooms, exhibition halls, rental screens — versatile cost-effective projects | High-end command centers, studios, monitoring halls, close-viewing and HD filming scenarios | High-end conference rooms, government/enterprise exhibition halls, HD video walls — high-end projects balancing image quality and maintenance cost |
One-line selection summary:
· DIP — the top choice for outdoor long-distance, ultra-high-brightness, low-cost traditional large screens.
· SMD — the top choice for general-purpose projects seeking value for money and easy later maintenance.
· COB — the top choice for high-end scenarios demanding ultimate image quality, close viewing, HD filming, and high protection.
· MIP — combines COB image quality with SMD maintainability; the most cost-effective choice for high-end small-pitch projects.
