Transparent Conductive Layer for Multi-Touch Screens

The patent replaces expensive ITO material with a cost-effective alternative consisting of conductive tracks made from inexpensive conductive ink or paste applied in a grid pattern. This disposable-like approach uses cheap materials that can be easily applied and discarded, eliminating the need for costly ITO while maintaining functional requirements for transparency and conductivity.

The invention uses a composite structure combining transparent carrier material with conductive tracks formed from conductive ink or paste. This composite approach integrates different materials with complementary properties: the transparent carrier provides optical clarity while the conductive tracks provide electrical conductivity, achieving the desired performance at lower cost than pure ITO.

The patent divides the conductive layer into multiple independent conductive tracks arranged in a grid pattern, forming distinct segments. Each track or intersection point can be independently addressed and measured, enabling the system to detect multiple touch points simultaneously. This segmentation transforms the single-function ITO layer into a multi-functional structure capable of multi-touch detection.

The invention transitions from a uniform two-dimensional ITO layer to a structured grid pattern with conductive tracks distributed across both x and y dimensions. This dimensional structuring creates multiple independent measurement paths, allowing the system to detect touches at various locations simultaneously, thereby enabling multi-touch functionality while maintaining transparency.

The patent segments the conductive material into thin individual tracks arranged in a grid pattern rather than using a continuous thick layer. Each track is thin enough to remain transparent, but the collective grid structure provides sufficient conductivity. This segmentation allows the system to achieve both transparency and conductivity by distributing the conductive material across many thin elements rather than concentrating it in a single thick layer.

The invention applies local quality by making the conductive tracks thin and transparent in regions where they are needed for conductivity, while maintaining overall transparency in the spaces between tracks. The grid pattern creates local variations in conductivity and transparency, with conductive regions providing electrical pathways and transparent regions allowing light passage, achieving both properties simultaneously.