Flexible Touch Sensing Unit With Self-Assembled Monolayer Conductive Layers

The patent replaces conventional rigid metal sensing electrodes and sensing lines with flexible conductive layers formed using self-assembled monolayers (SAMs). These SAM-based conductive layers can be deposited on flexible substrates and maintain electrical conductivity while accommodating bending and folding operations without cracking, directly resolving the reliability issue during mechanical deformation.

The patent changes the material parameters of the conductive layers from traditional metals to self-assembled monolayer materials, which possess different mechanical and electrical properties. The SAM-based conductive layers exhibit enhanced flexibility and crack resistance while maintaining sufficient conductivity, allowing the touch sensing unit to function reliably during bending operations.

The self-assembled monolayer conductive layer forms through self-assembly processes where molecules automatically organize into ordered structures on the substrate surface. This self-organizing capability simplifies the manufacturing process compared to traditional metal deposition techniques, as the material itself performs the structuring function rather than requiring complex external patterning equipment.

The patent replaces mechanical metal deposition and patterning processes with chemical self-assembly processes. Instead of using physical vapor deposition or sputtering to form conductive layers, the SAM molecules chemically assemble themselves on the substrate, eliminating the need for complex vacuum deposition equipment and reducing manufacturing complexity.

The self-assembled monolayer conductive layer serves multiple functions simultaneously: it provides electrical conductivity for touch sensing, acts as an etching mask during fabrication to define patterns, and serves as the final functional sensing element. This multi-functionality reduces the need for separate mask layers and simplifies the overall device structure despite the additional formation steps.

The patent merges the conductive layer formation and the mask layer formation into a single integrated process. The SAM-based conductive layer is formed in such a way that it inherently serves as the etching mask, combining what would traditionally be separate layers into one unified structure, thereby reducing device complexity.