Symmetric Pressure Sensor Touch Panel Baseline Drift
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Solution Overview
Problem
Touch panels experience baseline drifting in pressure sensing due to continuous pressing, leading to inconsistent pressure detection signals and poor pressure detection performance.
Innovation Solution
A touch panel design featuring symmetrically disposed first-type and second-type pressure sensors on opposite sides of the substrate, with a processor to calculate touch pressure intensity using signals from both sensors, mutually adjusting the pressure detection to mitigate baseline drifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is added to enable pressure sensing, then pressure detection capability is improved, but baseline drifting occurs when continuously pressed leading to poor pressure detection performance
Solution Approach 1:
The pressure sensing function is segmented into multiple independent pressure sensors (first-type and second-type) positioned at different locations on the substrate. Each sensor independently detects pressure at its location, and the processor combines these segmented measurements to determine overall touch pressure intensity, thereby improving reliability through distributed sensing
Solution Approach 2:
The patent employs symmetric placement of first-type and second-type pressure sensors about the centerline of the touch panel. This symmetric configuration creates a balanced sensing system where sensors counterbalance each other's baseline drift through differential measurement, compensating for drift effects and maintaining accurate pressure detection over time
2Duration of action of stationary object
If pressure sensors are continuously used for detection, then pressure sensing function is maintained, but baseline drifting causes inconsistent pressure detection signals
Solution Approach 1:
The processor continuously receives pressure detection signals from multiple pressure sensors and dynamically adjusts the touch pressure intensity calculation based on the combined feedback from all sensors. This feedback mechanism allows the system to compensate for baseline drift in real-time, maintaining signal consistency during continuous operation
Solution Approach 2:
The patent merges the output signals from multiple pressure sensors (first-type and second-type) to calculate the final touch pressure intensity. By combining multiple independent measurements, the system achieves more consistent and reliable pressure detection signals that are less susceptible to baseline drift affecting a single sensor
Data Source
AI summary
A touch panel is disclosed. The panel has a substrate having a touch region with a plurality of touch areas, a touch position detection apparatus, at least one pressure sensor group and a processor. The at least one pressure sensor group is disposed on the substrate. The pressure sensor group includes a first-type pressure sensor and a second-type pressure sensor. The first-type pressure sensor is located on a first side of the touch region and the second-type pressure sensor is located on a second side opposite to the first side of the touch region so that the first-type pressure sensor and the second-type pressure sensor of the same pressure sensor group are symmetric about the centerline of the touch panel. Each of the plurality of touch areas is associated with one of the at least one pressure sensor group.