When you read an LED module specification you will see codes like SMD1212, SMD2020 or SMD3535, and sometimes the words GOB or COB. They describe how the LEDs are packaged and protected, which affects durability, viewing comfort and price.
SMD: surface-mounted LEDs
Most modules use SMD LEDs: each pixel is a tiny package holding a red, green and blue chip, soldered onto the board. The number gives the package size in tenths of a millimetre, so SMD1212 is about 1.2 × 1.2 mm and SMD3535 about 3.5 × 3.5 mm. Fine-pitch indoor modules use small packages (for example SMD0606 on Qiangli's P0.88 module, SMD1212 on P1.5), while outdoor modules use larger, brighter ones (SMD2525 or SMD3535 on P8 and P10).
GOB: glue on board
A GOB module is an SMD module with a clear protective layer poured over the LEDs. The coating guards against moisture, dust and knocks, so individual LEDs are much harder to break off. GOB is a good choice for:
- Fine-pitch walls that people can touch, such as retail and reception areas
- Rental screens that are packed, moved and assembled often
- Humid or dusty indoor environments
The coating also gives a smoother, more matte surface. See the Qiangli Q1.5 MPro GOB module.
COB: chip on board
In a COB module the LED chips are mounted directly on the board and covered together, without separate packages. COB is used mainly for very fine pitches and offers strong protection and a uniform surface, usually at a higher price.
Which to choose
- Standard indoor or outdoor screens: SMD offers the best value.
- Touchable, rental or demanding indoor walls: GOB.
- Premium fine-pitch installations: consider COB.
Browse our LED modules or ask us which type suits your project.