COB packaging integrates upstream chip technology, midstream packaging technology, and downstream display technology. Therefore, COB LED display manufacturers will face more challenges. Let us talk about their Advantages and Disadvantages.
What is a COB LED display?
Advantages of COB:
Design and R&D: Without the diameter of a single lamp body, it can theoretically be made smaller;
Technical process: Reduce the cost of the bracket and simplify the manufacturing process, reduce the thermal resistance of the chip, and achieve high-density packaging;
Engineering installation: From the application side, COB LED display modules can provide simpler and faster installation efficiency for display application manufacturers.
Product characteristics:
1) Ultra-light and thin: According to the actual needs of customers, PCB boards with thicknesses from 0.4-1.2mm can be used to reduce the weight to at least 1/3 of the original traditional products, which can significantly reduce structural, transportation and engineering costs for customers.
2) Anti-collision and compression resistance: COB LED displays directly encapsulate the LED chip in the concave lamp position of the PCB board, and then encapsulate and solidify it with epoxy resin glue. The surface of the lamp point is raised into a spherical surface, which is smooth and hard, and is impact-resistant and durable.
3) Large viewing angle: The viewing angle is greater than 175 degrees, close to 180 degrees, and has better optical diffuse color and muddy light effects.
4) Strong heat dissipation ability: COB LED display encapsulates the lamp on the PCB board, and quickly transfers the heat of the wick through the copper foil on the PCB board. Moreover, the thickness of the copper foil on the PCB board has strict process requirements. Gold craftsmanship will hardly cause serious light attenuation. Therefore, there are very few dead lights, which greatly extends the life of the LED display.
5) Wear-resistant and easy to clean: the surface is smooth and hard, impact-resistant and wear-resistant; without a mask, it can be cleaned with water or cloth if there is dust.
6) Excellent all-weather characteristics: It adopts triple protection treatment, with outstanding waterproof, moisture, corrosion, dust, static electricity, oxidation, and ultraviolet effects; it meets all-weather working conditions and can still be used normally in a temperature difference environment of minus 30 degrees to plus 80 degrees.
It is for these reasons that COB packaging technology has been pushed to COB LED display for more application.
Current technical difficulties of COB:
At present, COB’s industry accumulation and process details need to be improved, and it also faces some technical difficulties.
- The one-time pass rate of packaging is not high, the contrast is low, and the maintenance cost is high;
- Its color uniformity is inferior to that of SMD LED display.
- Existing COB packages still use formal chips, which require die-bonding and wire-bonding processes. Therefore, there are many problems in the wire bonding process and the process difficulty is inversely proportional to the pad area.
- Manufacturing cost: Due to the high defective rate, the manufacturing cost far exceeds that of SMD small pitch.
Based on the above reasons, although the current COB technology has made certain breakthroughs in the LED display industry, it does not mean the complete withdrawal of SMD technology. In applications where the pixel pitch is above 1.0mm, SMD packaging technology relies on its mature and stable performance.
Leading Fine Pitch LED display from Doitvision
R500 Series LED Display For 3D XR Wall
Features：
· Pixel pitch: 1.5mm, 1.9mm, 2.3mm
· Curve installation
· Up to 7680Hz super high refresh rate
· Support 3D XR wall
Brick Series LED Display For Indoor
Features:
· Flexible screen size： Standard panel size: 500×1000 mm / 500×250 mm
· Full range of pixel pitch：1.5mm / 1.8mm,2.6mm / 2.9mm / 3.9mm
· 100% front service, bracket free
· Smart mechanical design
· Creative shapes
COB series Small pixel pitch LED display
Features:
· Superior pixel pitch:0.95mm, 1.25mm, 1.53mm
· COB technology
· Improved Reliability
· Great Energy Efficiency
Conclusion:
With the gradual improvement of COB packaged technology and the further evolution of market demand, COB packaging technology will reflect its advantages and value only in the range of 0.5mm~1.0mm pixel pitch. As a top professional LED display manufacturer, Doitvision has a variety of LED packages in small pixel pitch LED displays that can be used for indoor and outdoor. If you are looking for small pixel-pitch LED screens, please do not hesitate to contact us.