Touch Sensor Edge Constraint Correction via Pressure Displacement
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Solution Overview
Problem
Existing touchscreens struggle to accurately determine the position and intensity of touch inputs, especially near the edges, due to edge constraints causing recognition errors and movement inaccuracies.
Innovation Solution
A touch sensor system with a pressure sensor that calculates touch position and intensity using detection signals, and a controller that corrects for edge constraints by applying correction values based on the greatest displacement of the pressure sensor, ensuring precise touch recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is used to detect touch position and intensity, then touch sensitivity is improved, but edge constraint errors cause position accuracy to deteriorate near the boundaries
Solution Approach 1:
The system changes the parameter of position data by applying correction values to compensate for edge constraint effects. The controller calculates corrected position information by adjusting the raw pressure sensor data based on predetermined correction values, thereby maintaining measurement precision across the entire touch panel including edge regions.
Solution Approach 2:
The patent replaces the mechanical/physical constraint model with a computational correction model. Instead of physically modifying the pressure sensor or touch panel structure to eliminate edge effects, the system uses algorithmic correction values stored in memory to substitute for the physical measurement errors, converting a mechanical problem into an information processing solution.
2Speed
If touch position is calculated directly from pressure sensor signals, then response speed is improved, but position accuracy deteriorates due to edge constraints
Solution Approach 1:
The system performs preliminary action by pre-calculating and storing correction values in memory before actual touch operations. These correction values are computed in advance based on the known edge constraint characteristics of the touch panel, allowing the controller to quickly apply corrections during real-time touch detection without performing complex calculations that would slow down the response.
Solution Approach 2:
The patent creates a computational copy or model of the edge constraint effects in the form of correction values. Instead of directly measuring and correcting actual touch positions in real-time, the system uses pre-computed correction data that represents the edge constraint patterns, allowing fast application of corrections through simple data retrieval and addition operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides accurate and precise determination of touch positions and intensities, reducing recognition errors and movement inaccuracies, even near the edges of the touchscreen.
Implementation Method 1
a pressure sensor configured to become compressed along a first axis in response to a touch input into a touch area
Data Source
AI summary
A touch sensor includes a pressure sensor configured to become compressed along a first axis in response to a touch input into a touch area and a controller. The controller is configured to calculate a position of the touch and an intensity of the touch by using a detection signal obtained from the pressure sensor. The controller is further configured to calculate a first position, which has a greatest value of compression of the pressure sensor along the first axis, and calculate a position of the touch by correcting the first position by a first correction value corresponding to the greatest value of compression.