UNIT Indoor COB LED Display Products
UNIT COB LED displays, including the MA640 and MA600 series, feature ultra-fine pixel pitches for crisp, detailed images and a smooth surface for consistent visuals and a stylish look. UNIT COB LED display is rugged, waterproof, and dustproof and has excellent heat dissipation, ensuring reliable performance even in harsh conditions.
- 640*480mm Size
- 4:3 Cabinet Design
- Magnesium Alloy Cabinet
- P1.538mm, P1.86mm
- 600*337.5mm Size
- 16:9 Cabinet Design
- Die Casting Aluminum Cabinet
- P0.93, 1.25, P1.56mm
- 500x500mm Size
- Rental LED Screen
- Innovative Structural Design
- 2023 IF Design Award
What is COB LED Display?
COB (Chip on Board) LED display is an advanced display technology that forms a high-density pixel array by directly packaging red, green and blue LED chips on a printed circuit board (PCB). This packaging method enables the display to have a higher pixel density and a smaller dot pitch, thereby achieving higher resolution and clearer image quality.
Key Advantages of COB LED Screen
Compared with traditional surface mount device (SMD) technology, COB technology has significant advantages in many aspects:
First, the pixel pitch of the COB LED screen is smaller, which is suitable for close viewing and provides more delicate image details.
Second, since the chip is directly packaged on the PCB, the number of connection points and components is reduced, which improves the reliability of the product and reduces the failure rate.
In addition, the COB LED display has better heat dissipation performance, can effectively manage heat, and extend service life. Its waterproof and dustproof properties also enable it to operate stably in various environments.
Finally, the surface of COB display is flat, no additional mask is required, and a more uniform visual effect is presented.
Why Choose Us
UNIT Indoor COB LED Display Solutions
MA640 COB LED Screen Solution
- 640*480mm 4:3 Cabinet Design
- COB Pixel Picth: P1.538, P1.86mm
- Indoor Frontal Service LED screen
- Magnesium Alloy Cabinet Design
- Soft Connection Design
MA600 COB LED Screen Solution
- 600*337.5mm 16:9 Cabinet Design
- COB Pixel Picth: P0.93, 1.25, P1.56mm
- 150*168.75mm LED Module Design
- 3840Hz High Refresh Rate
- Hard Connection Design
MY500 COB LED Screen Solution
- 500x500mm Size Design
- Front & Rear Dual Maintenance
- Innovative Structural Design
- Excellent Visual Effects
- 2023 IF Design Award
COB LED Display Specification
| Pixel Pitch(mm) | P1.53mm | P1.86mm |
| LED | COB | COB |
| Module Resolution(dots) | 208*104 | 172*86 |
| Module Size(mm) | 320*160 | |
| Cabinet Resolution(dots) | 416*312 | 344*258 |
| Cabinet Size(mm) | 640mm*480mm*(WxH) | |
| Pixel Density(dots/pc) | 129792 | 88752 |
| Service ability | Full front service | |
| Protection Level(Front/Rear) | IP50 | |
| Weight | 7.5kg | |
| Grey Level (bit) | 14 | |
| Brightness(cd/㎡) | 650 | 750 |
| Contrast | 6000:1 | |
| Color Gamut | ≥90% NTSC | |
| Refresh Rate (Hz) | 3840 | |
| Vert. viewing angle | 140° | |
| Brightness Uniformity | ≥95% | |
Pixel Pitch (mm) | P0.9375 | P1.25 | P1.56 |
Pixel Configuration | COB | COB | COB |
Module Resolution (Pixel) | 160*180 | 120*135 | 96*108 |
Module Size (mm) | 150*168.75 | 150*168.75 | 150*168.75 |
Scan Mode (Duty) | 1/60 | 1/60 | 1/64 |
Cabinet Size (mm) | 600×337.5 | 600×337.5 | 600×337.5 |
Cabinet Weight (KG) | 4.5 | 4.5 | 4.5 |
Brightness (CD/㎡) | 400~600 | 400~600 | 400~600 |
Viewing Angle (°) | 170 | 170 | 170 |
Gray Grade (Bits) | 16 | 16 | 16 |
Operation Power | AC100-240V 50-60Hz | AC100-240V 50-60Hz | AC100-240V 50-60Hz |
Max. Power Consumption (W/㎡) | 450W | 450W | 450W |
Avg. Power Consumption (W/㎡) | 270W | 270W | 270W |
Frame Frequency (Hz) | ≥60 | ≥60 | ≥60 |
Refresh Frequency (Hz) | ≥3,840 | ≥3,840 | ≥3,840 |
Working Temperature (ºC) | -10～+60 | -10～+60 | -10～+60 |
Lifetime (Hours) | 100000 | 100000 | 100000 |
MA600 COB LED Screen Details
MY500 COB LED Screen Details
Video Center
Get A Quote
Contact us for the latest LED display quotation or any information you want! We will reply you within 12 hours.
COB LED Display - Everything You Need to Know
Among the many digital display technologies, COB LED display (chip-on-board LED display) has become an excellent solution for high-performance, high-resolution screens.
This guide comprehensively explores the ins and outs of COB LED display and analyzes its key aspects, including the technology behind it, advantages and features, applications, and differences from traditional SMD LED display. In addition, this post will also provide some solutions for COB LED screen displays to help you choose the right display technology.
1. What is a COB LED Display?
A COB (Chip-on-Board) LED display is an advanced LED video wall technology in which multiple LED chips are directly mounted onto a printed circuit board (PCB) without individual packaging, forming a single integrated module.
Unlike traditional SMD (Surface Mount Device) LED displays, which use individual LED packages on a circuit board, COB technology integrates multiple LED chips closely together. This results in a denser, seamless display that offers a higher pixel density and, consequently, superior resolution. Key features of COB LED screen include:
Feature 1. Ultra-Fine Pixel Pitch: COB LED screens provide very small pixel pitches, making them ideal for close-up viewing and applications where high resolution and sharp visuals are critical.
Feature 2. Seamless Look: With minimal spacing between individual LED chips, COB technology creates a virtually seamless display surface that enhances image uniformity and visual appeal.
Feature 3. Enhanced Color Uniformity: The close integration of the chips ensures a uniform color output across the panel, reducing issues such as color inconsistency.
Feature 4. Enhanced Brightness and Contrast: The dense arrangement of LED chips provides higher brightness levels and better contrast ratios, delivering vivid and clear visuals.
Feature 5. Improved Durability: COB technology offers better protection against environmental factors such as moisture, dust, and physical impact, making the displays more robust and reliable.
Feature 6. Efficient Heat Dissipation: Direct mounting of LED chips onto the PCB facilitates efficient heat transfer, enhancing the longevity and performance of the display.
2. How COB LED Technology Works?
COB LED technology involves mounting multiple bare LED chips directly onto a single substrate without the use of individual LED packages. Here’s how it works:
● Direct Bonding of LED Chips: The LED chips are directly bonded onto a ceramic or metal substrate. This minimizes the distance between the chips, leading to better heat dissipation and uniformity of light output.
● Phosphor Coating: After mounting, a phosphor layer is applied to convert the blue or ultraviolet light generated by the LED chips into broad-spectrum white light or to produce specific colors.
● High Packing Density: Since there is no need for individual LED packaging, the chips can be placed much closer together. This results in a higher packing density, which translates to a finer pixel pitch and a higher resolution display.
● Improved Thermal Management: The substrate used in COB technology, often made of metal or ceramic, offers superior heat conduction. This improves the LED’s lifespan and performance by efficiently dissipating the heat generated during operation.
3. COB Flip Chip LED vs Formal COB LED
When comparing Flip Chip COB LEDs to formal COB LEDs, several key differences emerge in terms of construction, performance, and application suitability.
| Feature | COB Flip Chip LED | Traditional (Formal) COB LED |
|---|---|---|
| Chip Orientation | Active side faces down (flip-chip design) | Active side faces up, using wire bonds |
| Thermal Management | Superior heat dissipation due to direct contact with the substrate | Less efficient, relies on wire bonds for thermal conduction |
| Electrical Efficiency | Lower resistance, better performance | Higher resistance due to wire bonds, less efficient |
| Brightness & Resolution | Higher brightness and resolution due to compact design | Lower brightness and resolution due to wire bond limitations |
| Reliability | More durable, no wire bonds, fewer failure points | Less durable, wire bonds can fail over time |
| Cost | Higher due to more advanced manufacturing | More cost-effective due to simpler production |
| Applications | High-end displays, automotive, and advanced lighting | General lighting, cost-sensitive applications |
4. Types of COB LED Screens
There are several types of COB LED screens, each designed to meet specific application needs and performance criteria.
Based on Pixel Pitch:
Type 1. Micro Pitch COB LED Screen:
This COB LED display offers a pixel pitch of around 1.0mm or less, making it ideal for environments where viewers are very close to the screen. Their high resolution and crisp image quality are perfect for command/control centers, broadcast studios, and high-end retail displays.
Type 2. Mini Pitch COB LED Screen:
With pixel pitches ranging from 1.0mm to 1.5mm, the Mini LED screen provides a balance between resolution and cost. They are commonly used in conference rooms, corporate lobbies, and exhibition halls where a clear, detailed display is needed, but the viewing distance is moderate.
Type 3. Standard Pitch COB LED Screen:
This COB LED display has pixel pitches greater than 1.5mm. It is a cost-effective solution suited for large-scale outdoor digital signage and billboards, where high brightness and robust performance are crucial, but the viewing distance is relatively far.
Based on Environmental Applications:
Type 1. Indoor COB LED Display: Designed for environments like conference rooms, retail stores, and museums, these screens prioritize high resolution and color accuracy.
Type 2. Outdoor COB LED Display: Built to withstand environmental factors, they feature higher brightness levels and protective coatings to ensure visibility and durability in outdoor settings.
Type 3. Rental COB LED Display: Engineered for portability and quick assembly, these COB LED displays are used in events, exhibitions, and temporary installations.
5. Advantages of COB LED Display
The COB LED display technology offers several significant benefits compared to other LED display technologies, particularly SMD LED displays:
Advantage 1. Superior Image Quality: The ultra-fine pixel pitch and seamless integration of multiple LED chips result in highly detailed and crisp visuals that are ideal for both close-up and large-scale displays.
Advantage 2. Better Durability and Reliability: COB LED display has a robust structure with improved thermal management. This increases the lifespan of the display by preventing hotspots and reducing the risk of failure.
Advantage 3. Enhanced Color Uniformity: With the chips placed in a dense array and bonded directly to a substrate, the color consistency across the screen is greatly improved.
Advantage 4. Reduced Viewing Gaps: The minimal spacing between LED chips in COB technology significantly minimizes the gaps between pixels. This leads to a continuous, flawless image that offers a more immersive viewing experience.
Advantage 5. Efficient Manufacturing: The COB process simplifies assembly, resulting in lower production costs and higher yield. This efficiency makes COB LED display particularly appealing in cost-sensitive markets without sacrificing performance.
COB LED technology offers numerous benefits, including high resolution, superior brightness, enhanced durability, efficient heat dissipation, and wide viewing angles. However, considerations such as higher initial costs, complex maintenance, and manufacturing challenges should be taken into account when evaluating its suitability for specific applications.
6. SMD vs COB LED Display: A Detailed Comparison
SMD (Surface-Mounted Device) and COB (Chip-on-Board) are two prominent LED technologies used in display manufacturing. Each offers distinct advantages and is suited to different applications. A common question in the LED display market is: SMD vs COB LED display — which is better? Here is a detailed comparison:
Comparison 1. Pixel Pitch and Resolution
● SMD LED Display: It typically features individually packaged LEDs with larger gaps between pixels. While they offer good resolution, the gap between individual LED packages may sometimes be visible, especially at closer viewing distances.
● COB LED Display: It offers an ultra-fine pixel pitch as the LED chips are mounted directly onto the board. This results in a seamless display surface with higher resolution and greater clarity, making them ideal for applications demanding high image fidelity.
Comparison 2. Thermal Management
● SMD LED Display: The separate packaging can create thermal bottlenecks, affecting the longevity and stability of the LED modules under high-power conditions.
● COB LED Display: The direct bonding of LED chips to the substrate ensures efficient heat dissipation. Enhanced thermal management leads to better stability, a longer lifespan, and more consistent performance.
Comparison 3. Color Uniformity and Brightness
● SMD LED Display: This may exhibit slight color variations due to inconsistencies in LED packaging and spacing.
● COB LED Display: It provides superior color uniformity because the chips are densely and uniformly arranged. This enhances overall brightness and ensures a consistent image across the display.
Comparison 4. Cost Considerations
● SMD LED Display: It often has a lower initial cost due to established manufacturing processes; however, higher maintenance and energy costs over time may affect the total cost of ownership.
● COB LED Display: Although the upfront cost may be higher, the benefits of improved image quality, longevity, and energy efficiency typically result in lower overall operating costs.
Comparison 5. Structural and Environmental Robustness
● SMD LED Display: While reliable, it can be more susceptible to damage from physical impact due to its individual chip packages.
● COB LED Display: Benefit from a more integrated structure that is inherently more robust. It is designed to be more resistant to environmental stress, including vibration, dust, and water.
While both SMD and COB LED displays have their merits, COB LED screen technology excels in offering higher resolution, better thermal performance, and improved color uniformity, especially in demanding applications.
7. Applications of COB LED Display
COB LED display is ideal for applications that require high-quality visuals and robust protection. It is commonly used in high-end conference rooms, command centers, studios, and upscale retail environments.
In the commercial display field：
COB LED screens provide clear and stable images, thanks to seamless splicing technology that eliminates picture gaps and reduces visual interference. This creates a smooth, uninterrupted visual experience, which is perfect for conference presentations and corporate communications.
In education：
COB LED displays can replace traditional projectors and whiteboards. Their high-definition imagery and detailed picture quality help students grasp complex concepts better. Additionally, in training centers and corporate conference rooms, these displays efficiently deliver training materials and meeting content, improving the overall quality of information transmission.
For transportation and security：
COB LED displays are highly effective. At airports, railway stations, and subways, their high brightness ensures that flight, train schedules, and guidance information remain easily readable, even in challenging lighting conditions. In security monitoring centers, they deliver high-resolution, seamlessly spliced video feeds from multiple cameras, ensuring that monitoring images are clear and continuous.
In sports and entertainment venues：
COB display broadcasts real-time game footage and score information, delivering an immersive viewing experience for spectators. It is also used as an LED screen for stage to enhance the atmosphere at concerts by displaying performance information and dynamic background visuals.
In smart cities:
COB LED displays in public areas like squares and parks disseminate real-time information, including weather updates and news, and assist with intelligent traffic indications using IoT technology.
8. COB LED Display Price
The COB LED display price is influenced by a number of factors, including pixel pitch, screen size, brightness, and installation complexity.
① Pixel pitch and resolution: Smaller pixel pitches (such as P1.2 or P0.9) offer higher resolution. However, these finer pitches also result in higher costs due to the higher density of LED chips required.
② Screen size: The larger the display size, the higher the cost, depending on the specifications and customization requirements.
③ Brightness and refresh rate: Displays with higher brightness (above 3500 nits) and higher refresh rates (above 1000Hz) are more expensive due to the more advanced technology and components required.
④ Installation and customization: COB LED displays often require precise installation and may require custom frames or structures, especially in unique architectural integrations. This complexity increases the overall cost.
⑤ Maintenance and lifespan: Although the initial investment is higher, COB LED display has a longer lifespan (usually over 100,000 hours) and lower maintenance costs due to their durability and efficient heat dissipation.
9. How to Choose a Suitable COB LED Display for Your Events?
Choosing the right COB (Chip-on-Board) LED display for your events involves several key factors for optimal performance and ROI:
① Application Needs:
Identify the display’s purpose — as retail LED display advertising, corporate presentations, control rooms, or outdoor signage. High-resolution displays with a fine pixel pitch (≤1.5mm) work best for close viewing, while larger pixel pitches (>3mm) are ideal for distant viewing.
② Durability & Maintenance:
Ensure the display is robust with efficient heat dissipation and proper ingress protection (IP) for outdoor use.
③ Viewing Distance & Pixel Pitch:
Smaller pixel pitches offer sharper images for nearby viewers, while larger ones are more cost-effective for far-away audiences.
④ Brightness & Contrast:
Outdoor displays require high brightness (above 4000 nits) for sunlit visibility, whereas indoor screens typically need around 800-1000 nits. A high contrast ratio enhances image depth and vibrancy.
⑤ Energy Efficiency & Cost:
Lower power consumption reduces long-term costs despite higher initial investment.
⑥ Reputable Manufacturer:
Select a supplier with proven credentials (ISO, CE, RoHS) and strong after-sales support.
By considering these factors, you can choose a COB LED display that meets your business needs and delivers a compelling visual experience.
10. Common Faults and Solutions
Fault 1. Non-Uniform Brightness or Color Inconsistency
- Reason:
Variations in brightness or color across the display may be caused by faulty LED chips, inconsistent phosphor coatings, or issues with the LED driving circuits.
- Solution:
- Check the LED Modules: Inspect for any damaged or non-functioning modules and replace faulty units.
- Calibration: Perform a thorough color calibration using specialized tools to adjust the brightness and color uniformity.
- Driver Inspection: Verify the driving circuits for proper voltage supply and ensure all connections are secure.
Fault 2. Dead Pixels or Lines
- Reason:
Dead pixels or entire lines of non-functioning LEDs can appear due to chip failure or soldering issues.
- Solution:
- Module Replacement: Identify the defective modules and replace or repair them if under warranty.
- Reflow Soldering: In some cases, reflow soldering can re-establish proper connections.
Fault 3. Flickering or Unstable Images
- Reason:
Flickering or unstable images are often due to power supply fluctuations, poor thermal management, or signal transmission issues.
- Solution:
- Power Check: Ensure the power supply is stable and matches the device’s required specifications.
- Heat Dissipation: Clean or adjust the heat sinks and ventilation to maintain a consistent operating temperature.
- Signal Connection: Verify that all signal cables and connectors are intact and properly seated.
Fault 4. Connectivity and Communication Errors
- Reason:
Issues such as data dropouts or communication errors between the controller and the display can disrupt performance.
- Solution:
- Cable and Connector Inspection: Check all Ethernet, HDMI, SDI, and other connections for damage.
- Firmware Update: Update the firmware of the LED controller to resolve known software glitches that might affect signal transmission.
- System Reset: Perform a system reset or calibration procedure as guided in the technical manual.
Fault 5. Overheating
- Reason:
Overheating can lead to thermal shutdown or degraded performance, often due to inadequate heat dissipation.
- Solution:
- Ensure Proper Ventilation: Verify that the display has sufficient airflow and that cooling fans or heat sinks are functioning properly.
- Monitor Operating Temperature: Use built-in diagnostics to monitor and adjust thermal settings if needed.
11. Usage & Maintenance Guide
Daily Use Precautions
① Power Management: COB LED display screens should use a stable power supply to avoid frequent power on/off operations.
② Environmental Control: The temperature and humidity of the working environment of the display screen have a great impact on its performance and life. The ideal working temperature range is generally between 20℃ – 35℃, and the humidity is between 40% – 60%.
③ Signal Input Specifications: The output resolution and refresh rate of the signal source devices connected to the display screen, such as computers, video processors, etc., should match the optimal display parameters of the display screen.
Main Points for Regular Maintenance
● Appearance Cleaning: Clean the appearance of the display screen regularly to maintain good display effects and aesthetics.
● Hardware Inspection: Regularly inspect the hardware of the display screen, including modules, power supplies, circuits, etc.
● Software Update and Optimization: Pay attention to the update information of the display control system software regularly and upgrade the software promptly.
By timely solving common problems of COB LED display screens and correct use and maintenance, the service life of the display screen can be effectively extended, its good display performance can be maintained, and a high-quality visual experience can be brought to users.
12. Conclusion
COB LED display technology represents a significant leap forward in digital signage, offering unparalleled resolution, superior thermal management, and a seamless viewing experience that outperforms traditional SMD LED displays. With its ultra-fine pixel pitch, consistent color reproduction, and robust design, COB LED screen is the future of both indoor and outdoor digital advertising.
