Passive Touch IC Scan Parameter Configuration
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Solution Overview
Problem
Existing active touch panel scanning architectures lack flexibility, as slave touch ICs are fixed to specific scan parameters and cannot be reconfigured or exchanged, leading to inflexibility and an inability to address the 'ghost phenomenon' in larger scale touch panels.
Innovation Solution
A passive architecture where a master IC provides scan parameters to passive touch ICs, allowing for dynamic configuration and reconfiguration of scan parameters, eliminating the need for specific firmware and enabling the reuse of passive touch ICs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If slave touch ICs are configured with specific scan parameters in advance, then the scan time is reduced for larger touch panels, but the application flexibility is lost and the ICs cannot be reconfigured or exchanged
Solution Approach 1:
The patent implements a dynamic configuration approach where scan parameters are not fixed in hardware but are loaded from memory at runtime. The slave touch IC receives configuration data including scan parameters (such as trace selection, scan mode, scan time, and analog parameters) from a host controller, allowing the system to dynamically adapt to different touch panel configurations and requirements while maintaining efficient scanning performance.
2Manufacturing precision
If each slave touch IC has different firmware and analog parameters for specific traces, then the scan parameter configuration is precise, but the ICs cannot be exchanged or reconfigured with new scan parameters
Solution Approach 1:
The patent creates a universal slave touch IC design that can function with multiple different scan parameter configurations. Instead of customizing each IC for specific traces, the universal design includes a memory unit to store configuration data and a controller that can load and apply different parameter sets. This allows a single IC model to be used across different touch panel configurations, enabling exchangeability while maintaining precise parameter control through software configuration rather than hardware customization.
3Reliability
If slave touch ICs are specified for fixed traces, then the firmware can be optimized for that specific configuration, but the system cannot solve the ghost phenomenon or scan different portions of the touch panel
Solution Approach 1:
The patent enables dynamic parameter changes by storing multiple scan parameter configurations in memory and selecting appropriate parameters based on the detected data and system requirements. When ghost phenomenon is detected or when scanning different touch panel portions is needed, the host controller can load different parameter sets (such as adjusting scan traces, scan modes, or analog parameters) without changing the hardware configuration. This maintains firmware optimization while providing the flexibility to resolve ghost phenomena and adapt to different scanning needs.
Data Source
AI summary
A passive architecture for scanning a touch panel includes a master IC and at least one passive touch IC connected to the master IC. The master IC generates a command to configure the scan parameters of the at least one passive touch IC, and the at least one passive touch IC scans the touch panel with the scan parameters in response to the command.