PCB technology company Rainbow Technology Systems has developed a revolutionary new method for manufacturing touchscreen displays which it says is more cost-effective, faster and greener than traditional methods.
The Rainbow Process Unit has been developed for primary imaging of PCB inner layers, but the technology can be equally applied to touchscreen displays where it is capable of producing very fine line circuitry (down to five micron detail levels). Central to the success of the Rainbow process is the proprietary liquid etch resist which does not require pre-drying (using a hot air or infra-red oven) before imaging. The resist is 100% solids and completely solvent-free.
Rainbow can produce grid patterns with, for example, five micron copper lines in a hexagonal pattern at 300-micron pitch, offering more conductivity than ITO or conductive polymers with extremely good transparency. The process can be done additively using an imaged seed layer.