What Are Advantages of Doitvision’s COB LED screen?

LED display screens have been widely used in commercial buildings, campus hospitals, exhibition halls, specialty stores, subway terminals, etc. However, as the needs of industry customers become increasingly personalized, fixed, single, and modular LED display screens can no longer meet the needs. Based on this, Doitvision launched the micro-pitch COB LED display screen, which has the characteristics of micro-pitch, fine picture, and high protection. Today, we will introduce the core advantages of Doitvision’s COB LED display screen.

What is COB packaging technology

LED technology initially used traditional SMD packaging technology. The general LED packaging process of this technology is solid crystal, wire welding, molding, cutting, sorting, taping, (lamp bead) patch, testing, aging, assembly, and then delivery. Overall, it is to first encapsulate the wafer into lamp beads, and then use high-temperature reflow soldering to solder the lamp beads on the PCB board.

However, the disadvantage of SMD LED packaging technology is that the pixel pitch is too large, and the heat dissipation performance of the lamp beads is not good. The lamp beads are easily damaged during long-term use, resulting in phenomena such as bad pixels on the LED screen.

With the iteration and update of technology, COB technology began to develop and be used by the industry after SMD packaging technology.

In the early stage, COB technology was mostly focused on the “forward-mounted” process, which is to fix the chip on the PCB board and realize its electrical connection through thse step:

• Wire bonding, omitting the two major processes of packaging the LED chip into lamp beads
• high-temperature reflow soldering, shortening the process path
• reducing damage to the chip, and significantly improving reliability.

However, the early forward-mounted SMD was too expensive to apply, so that the price of COB LED  screenremained high and it was difficult to be widely used in the industry market.

Nowadays, with the continuous breakthroughs and innovations in technology, flip-chip Mini LED COB, flip-chip Micro LED COX (GLASS/PI) and other processes have begun to enter the market:

• further shortening the process path,
• reducing thermal resistance,
• improving light quality and reliability,
• greatly reducing the manufacturing cost of COB LED.

Flip-chip technology makes the electrical connection between the chip and the substrate tighter, reduces the wire bonding link, and further improves the packaging efficiency and stability.

With the support of COB technology, the pixel pitch of LED display screens has also been continuously reduced.

Currently, the pixel pitch of the new micro-pitch COB display launched by Doitvision ranges from P0.4-P1.5mm. Compared with traditional LED displays, their pixel pitch is lower, and they have higher screen brightness and higher display contrast, so the picture is more detailed and complete.

Technical decoding:

• Process flow reduction: Flip chip technology realizes direct bonding without solder wires, reduces multiple links in the packaging process, and reduces the overall process flow by 40%.
• Physical structure optimization: The chip is fully wrapped and protected by the bottom filling glue, with a protection level of IP65, which effectively improves the durability and protection performance of the display.
• Thermal management upgrade: The heat conduction path is shortened by 70%, and the thermal resistance is reduced to 0.5K/W, which significantly improves the heat dissipation efficiency and extends the service life of the display.

Our COB LED screen core advantage

Pixel doubling technology

Pixel doubling technology has long been maturely applied on OLED panels. It is to use specific algorithms and processing methods to enable the display to present more virtual pixels while keeping the original physical pixels unchanged, thereby achieving higher resolution and more delicate image display effects.

At present, pixel doubling technology mainly includes vertical and horizontal doubling, color mixing, color dithering and other implementation methods, which can improve the resolution and image quality of LED display screens to a certain extent.

Doitvision’s COB LED display screen adopts this technology, and then creates a more professional ultra-HD display solution for industry users through advantages, such as higher picture quality resolution,

• higher contrast,
• lower reflectivity,
•  lower screen front temperature.

Pixel Pro X engine:

• Sub-pixel rendering technology: Split each physical pixel into 4 virtual pixels, which significantly improves the resolution and makes the image more delicate.
• Dynamic color compensation algorithm: Real-time correction of adjacent pixel color temperature deviation to ensure the consistency and accuracy of display color.
• 3D-LUT color mapping: Achieve 110% NTSC color gamut accurate coverage, richer and more realistic color performance.

In the 8K medical imaging display scene, this technology increases the texture detail resolution of cell tissue by 300%, helping to increase the accuracy of early lesion identification by 15 percentage points.

The application of this technology in professional scenes such as high-end conference rooms and XR virtual shooting has solved the problem of obvious pixel graininess of traditional LED display screens, providing a clearer and more delicate display effect.

UBP Ultra-black Optical Processing Technology

UBP (Ultra-black Processing) black optical processing technology is a screen processing technology independently developed by us in conjunction with the Chinese Academy of Sciences.

It can be mainly used to improve the display contrast and black performance of COB LED display screens. Moreover, this technology can be integrated with surface protection to perfectly unify the physical protection strength and optical viewing effect.

After using this technology, the panel reflectivity of COB LED display screens can be reduced, the consistency and depth of black, and the display contrast can be improved, making the details of bright and dark parts clearer, and enhancing the layering and three-dimensional sense of the picture. Even UBP can reduce or eliminate the halo effect that appears around bright areas, making the edges of the image clearer.

Three major innovations of UBP technology:

• Nano-level black matrix: Reduces the pixel gap reflectivity to 0.5%, significantly improving the black purity and contrast.
• Multilayer optical film group: achieves contrast maintenance under 178° wide viewing angle, ensuring that the picture can maintain excellent display effects at all angles.
• Surface microstructure treatment: eliminates 99% of ambient light interference, making the picture purer and clearer.

Doitvision’s COB micro-pitch LED display has a display contrast of up to 10000:1, and has a 110% NTSC wide color gamut, making the picture display fuller and the color more delicate. The application of this technology in professional scenes such as film shooting and virtual production has brought the visual experience to a new level.

Doitvision COB LED Dislay Solution:

Doitvision COB Screen has not only made breakthroughs in technology, but also provided innovative solutions for different scenes through modular architecture design and industry customization solutions.

• Modular architecture design:
• Free-form splicing: supports arc, cylindrical, spherical and other special-shaped constructions to meet the visual needs of different scenes.
• Front maintenance design: achieves 85mm ultra-thin cabinet depth for easy installation and maintenance.
• Intelligent temperature control system: power consumption is reduced by 30%, noise is <20dB, and overall energy efficiency is improved.

Conclusion:

In the era of explosive growth of 4K/8K content, Doitvision COB LED display not only solves the inherent defects of traditional display technology, but also redefines professional display standards through technological innovation.

As flip-chip COB technology continues to break through the cost bottleneck, it is expected that by 2025, the penetration rate of micro-pitch LED in the professional display market will exceed 60%.

Doitvision is promoting the evolution of the display industry towards a smarter, more environmentally friendly, and more humane direction through continuous technological iteration, providing a core visual engine for the digital transformation of various industries. If you need a COB LED screen, please feel free to contact us.