Touch Panel Signal Segmentation for Noise Reduction
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Solution Overview
Problem
Conventional touch systems face interference issues when the palm, finger, or wrist of a user approaches or contacts the touch panel, leading to noise in the uplink signal that reduces the analysis ability of the touch tool for the intended signal from the sensing area.
Innovation Solution
The touch system employs a touch panel that distinguishes between a first sensing area with the touch tool and a second sensing area, providing different uplink signals to each, allowing the touch tool to generate a calculated uplink signal and maintain analysis ability by subtracting noise from the intended signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch panel provides a single uplink signal to all sensing areas, then the system structure is simple, but the touch tool cannot distinguish between signals from the intended sensing area and noise from other areas
Solution Approach 1:
The touch panel divides the sensing areas into multiple segments (first sensing area and second sensing area) and provides different uplink signals to each segment. This segmentation allows the touch tool to distinguish between signals from the intended sensing area and noise from other areas, thereby improving signal analysis ability without significantly increasing system complexity
Solution Approach 2:
Different uplink signals are provided to different sensing areas based on their specific functions. The first sensing area receives a first uplink signal while the second sensing area receives a second uplink signal. This local differentiation enables the touch tool to identify and analyze signals from the correct sensing area while filtering out noise from other areas
2Reliability
If the touch panel provides uplink signals to all sensing areas simultaneously, then the coverage is comprehensive, but the uplink signal from other sensing areas interferes with the touch tool's ability to analyze the intended signal
Solution Approach 1:
The sensing areas are segmented into first and second sensing areas with distinct uplink signals. This segmentation prevents the uplink signal from the second sensing area (which would otherwise be noise) from interfering with the touch tool's analysis of the uplink signal from the first sensing area, thereby improving signal accuracy
Solution Approach 2:
The patent converts the potentially harmful uplink signal from the second sensing area (which would be noise) into a beneficial distinguishable signal by providing it with a different characteristics (second uplink signal). The touch tool can then identify and exclude this signal, transforming what would be interference into a manageable element that improves overall signal reliability
Data Source
AI summary
A touch system is provided. The touch system includes a touch tool and a touch panel. The touch tool provides a downlink signal. The touch panel obtains a first sensing area sensed with the touch tool, and obtains a second sensing area other than the first sensing area according to the downlink signal. The touch panel provides a first uplink signal to the first sensing area, and provides a second uplink signal to the second sensing area. The first uplink signal is different from the second uplink signal. The touch tool generates a calculated uplink signal according to the first uplink signal and the second uplink signal, and provides the downlink signal according to the calculated uplink signal.