Shieldless Touch Sensor Noise Cancellation via Reference Drive

The patent merges multiple sense lines into a single combined sense line that collects signals from all sense lines. This single sense line is then connected to a single integrator, replacing the traditional approach where each sense line had its own integrator. The merging approach maintains measurement precision while significantly reducing device complexity and component count.

The single integrator serves as a universal component that processes signals from all sense lines through the combined sense line. This multi-functional approach eliminates the need for multiple dedicated integrators, reducing manufacturing cost and device complexity while maintaining the ability to compensate for electronic noise across the entire touch sensor array.

The patent merges multiple sense lines into a single combined sense line that collects signals from all sense lines. This single sense line is then connected to a single integrator, replacing the traditional approach where each sense line had its own integrator. The merging approach maintains measurement precision while significantly reducing device complexity and component count.

Instead of using multiple physical integrators, the patent uses a single integrator that is shared across all sense lines through time-multiplexed operation. The system sequentially activates different sense lines and uses the same integrator for each, effectively copying the functionality of multiple integrators with a single physical component, thereby reducing manufacturing cost.

The patent extracts and eliminates the need for electronic shields by implementing a different noise compensation approach. Instead of adding physical shielding structures, the system uses signal processing techniques where a reference sense line measures electronic noise separately, and this noise measurement is then subtracted from the actual sense line measurements. This extracts the noise compensation function from physical shielding to electrical signal processing.

The patent replaces the mechanical/physical approach of electronic shields with an electrical/software-based approach. Instead of using physical barriers to block electromagnetic interference, the system uses electrical signal measurement and mathematical subtraction to compensate for noise. This substitution eliminates complex physical structures while achieving the same noise reduction goal.

The patent introduces a combined sense line as an intermediary element between the multiple sense lines and the single integrator. This combined sense line collects and aggregates signals from all sense lines, allowing a single integrator to process information that would otherwise require multiple integrators. The intermediary structure enables the system to maintain measurement precision across all sense lines while using fewer integrators.

The system uses periodic action by sequentially activating different sense lines and using the same integrator for each in turn. Through time-multiplexed operation, the single integrator processes signals from multiple sense lines at different time intervals. This periodic operation allows the integrator to maintain its measurement precision for each sense line while sharing the component across the entire array.