Palm Rejection Program for Touch Signal Processing
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Solution Overview
Problem
Conventional touch panels, particularly resistive types, often mistakenly register palm inputs as touch events, leading to fault signals and requiring increased finger pressing force to prevent palm rejection, which is inconvenient for users.
Innovation Solution
A computing device with a resident palm rejection program that processes touch input signals in real-time to eliminate unintended palm touches, allowing normal operation without increased force requirements and reducing manufacturing costs by avoiding high-density spacer designs in touch devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the density of the spacers is increased in the touch panel, then the palm rejection function is improved, but the pressing force required for effective touch input is increased
Solution Approach 1:
The patent replaces the mechanical spacer-based palm rejection system with a software-based processing method. The computing device executes a palm rejection program that analyzes touch signal characteristics (such as touch area, pressure distribution, and contact patterns) to distinguish between intentional finger touches and unintentional palm contacts, eliminating the need for high-density physical spacers and their associated mechanical force requirements
Solution Approach 2:
The patent changes the approach from physical parameter modification (spacer density) to signal parameter analysis. By processing touch signal parameters such as contact area, pressure distribution, and touch duration, the system achieves palm rejection without requiring physical structural changes that would increase pressing force
2Reliability
If the structure of the touch panel is modified to achieve palm rejection, then the palm touch event is eliminated, but the device complexity is increased
Solution Approach 1:
The patent replaces complex mechanical structural modifications with a software-based solution. Instead of redesigning the touch panel's physical structure with high-density spacers or specialized conductive layers, the system uses a computing device to execute algorithms that analyze and filter touch signals, significantly reducing device complexity
Solution Approach 2:
The palm rejection program can be applied to various touch panel types (resistive, capacitive, etc.) without requiring specific structural modifications. This universal software solution works across different device configurations, avoiding the need for specialized complex structures in each touch panel design
3Reliability
If high-density spacer design is used in the touch device, then the palm rejection function is improved, but the manufacturing cost is increased
Solution Approach 1:
The patent replaces expensive high-density spacer manufacturing with a software-based palm rejection program. This eliminates the need for costly precision manufacturing of high-density spacer structures while achieving the same palm rejection functionality through signal processing algorithms
Solution Approach 2:
The patent uses a software-based solution that can be implemented without expensive hardware modifications. The palm rejection program can be deployed as firmware or software, which is much cheaper to produce and update compared to manufacturing high-density spacer structures, allowing for cost-effective palm rejection functionality
Data Source
AI summary
A processing method for touch signal includes the steps of loading a palm rejection program staying resident on a computing device, and receiving a touch input signal from a touch device by the computing device. The palm rejection program performs a palm rejection process to the touch input signal in real time or instructs the touch device to output the touch input signal after performing the palm rejection process.