Bonding solutions for successful electrical connection of mini and microLED

In the past decades the color gamut and resolution of displays was increased, as well as the energy efficiency. Under the current circumstances and with respect to their size microLEDs offer benefits for light weight smart glasses, transparent displays and automotive interior displays. Even the implementation in automotive rear lamps seems to be interesting for designers and engineers. An important material class are adhesives or so called functional polymers. Directional conductive adhesives can be coated over lager areas enabling the electrical and mechanical connection, while intrinsically preventing short circuits. Moreover functional polymers can be tailored in terms of color, transmission and viscosity to name only a few important parameters. It will be shown, that a reliable electrical and mechanical connection of miniLEDs with adhesives is possible after automated pick and place and thermal curing as an alternative to conventional solder materials.