Touch Pressure Sensor Calibration for Abnormal Screen Readings
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Solution Overview
Problem
Current touch screen devices with damaged or broken touch pressure sensors provide inaccurate pressure or force data, leading to improper functionality due to the inability to effectively handle abnormal sensor operations.
Innovation Solution
A method and device configuration that acquire touch pressure data from multiple sensors, determine abnormal operation, and apply correction factors to ensure accurate pressure output by summing and multiplying data from functioning sensors, using calibration modes to generate zone-specific correction factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch pressure data is acquired from multiple sensors and summed directly, then the calculation is simple and fast, but the pressure data becomes inaccurate when one or more sensors are damaged or functioning abnormally
Solution Approach 1:
The system performs preliminary calibration before normal operation to establish correction factors for each sensor. During calibration mode, the system applies known forces to each sensor and records the relationship between applied force and sensor output, storing these as correction factors. In normal operation mode, these pre-determined correction factors are applied to sensor readings to compensate for abnormalities, eliminating the need for complex real-time analysis of sensor health.
Solution Approach 2:
The system changes the operational parameters by switching between calibration mode and normal operation mode. In calibration mode, known forces are applied to determine correction factors. In normal operation, these correction factors are applied to the sensor data to adjust the pressure calculation. This parameter change allows the system to adapt to sensor abnormalities without requiring complex real-time diagnostics.
2Reliability
If correction factors are applied to compensate for abnormal sensor readings, then pressure data accuracy is maintained, but the system requires additional calibration procedures and mode switching
Solution Approach 1:
The system segments the operational流程 into distinct modes: calibration mode and normal operation mode. This segmentation allows the complex calibration procedure to be separated from the simple normal operation. During calibration, the system systematically tests each sensor and determines correction factors. During normal operation, the system simply applies these pre-determined factors, making the operation simple despite the underlying complexity of handling sensor abnormalities.
3Area of stationary object
If the system uses multiple touch pressure sensors to improve measurement coverage, then the area of pressure sensing is increased, but the probability of having damaged or abnormal sensors increases
Solution Approach 1:
The system applies correction factors to modify the output parameters of abnormal sensors. By changing the parameter of each sensor reading through multiplication with a correction factor, the system compensates for sensor abnormalities. This allows the system to maintain reliable pressure measurements across the entire sensing area even when some sensors are damaged, as the correction factors adjust the readings to reflect true pressure values.
Data Source
AI summary
A device includes a touch and pressure sensitive screen having touch pressure sensors and a controller. The controller acquires touch pressure data from the plurality of touch pressure sensors. For each touch pressure sensor, the controller determines whether the touch pressure data from that touch pressure sensor is indicative of abnormal operation of that touch pressure sensor. Where no abnormal operation is indicated, the controller sums the touch pressure data from each of the touch pressure sensors to produce a touch pressure output. Where abnormal operation is indicated, the controller sums the touch pressure data from each of the touch pressure sensors and multiply the sum by a correction factor to produce the touch pressure output.