Industry news
Comparison between COB display screen and LED display screen
Many customers who come into contact with LEDs often hear about COB technology, which makes them confused about its differences from traditional LED displays. In fact, what we are talking about is C0B, which is an emerging packaging technology for LED displays. In the past, LED displays used SMD surface mount packaging, so the comparison between COB displays and LED displays actually refers to the comparison between SMD packaging and COB packaging. What are the differences between the two?
1、 Packaging technology differences
Nowadays, our conventional LED display screens use surface mount SMD packaging. This packaging technology involves fixing the LED chip through a bracket, curing it with epoxy resin inside, and then fixing it on the PCB board with solder paste, followed by reflow soldering to evenly arrange the LED beads on the board. However, this technology process is cumbersome, requires a certain amount of operation time, and the minimum distance between points can only be 1.2, even if it is multi in one, it can be done to a smaller size, But still unable to get rid of the problem of losing the lights. COB packaging simplifies the packaging process of LED chips by directly integrating them onto the PCB board and fixing them with adhesive. The entire process is simpler, without the need for reflow soldering, and the LED chips are more stable. At the same time, the spacing between points can also be smaller.
2、 Point spacing difference
Ordinary SMD packaged LED displays are limited by packaging technology, and their point spacing is usually above P1.2, such as P1.2, P1.56, P1.875, P2.0, P3, P4, and so on. Products with small spacing are affected by welding technology, and there may be phenomena such as light bead detachment. Its development limitation is mainly that it cannot achieve point spacing below 1.0, resulting in the inability to further improve the screen resolution, If it is a situation that requires high clarity in image quality, it is not very suitable.
The display screen packaged with COB can achieve smaller dot spacing, for example, the P1.2, PO.9, and PO.6 products provided by our company all use COB packaging, and the technology is mature, with basically no light loss, greatly improving the overall resolution and higher image clarity.
3、 Stability differences
In the production, transportation, and installation of traditional LED display screens, due to the fact that the lamp beads are exposed to the surface, the lamp beads will fall off when touched by fingers or collided with other things during installation, resulting in a certain pixel not lighting up. This is mainly because the lamp beads are welded to the PCB board, and collision can easily cause the lamp to fall out. If you want to repair it later, you can only have technical personnel come to the site to weld or directly replace the unit board, Causing a high after-sales rate.
The display screen packaged with COB has better protective performance, and it will not cause the lamp beads to fall during installation and use, so its surface is also more collision resistant and its stability is greatly improved.
Basically, the main difference between COB displays and LED displays is the above three points. From the perspective of industry development, COB screens will be the mainstream direction in the future. Compared with traditional surface mount technology displays, COB displays have many advantages such as high reliability, low cost, small spacing, wear resistance, impact resistance, and strong heat dissipation ability.
Charles