Touch Panel Indicator Position Detection With Localized Reference Adjustment
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Solution Overview
Problem
Large-sized touch panels experience variations in thickness, leading to detection difficulties and erroneous indicator detection, particularly in regions with varying thickness distributions, which affects the accuracy of user operations in electronic information devices.
Innovation Solution
A touch panel system with a detection reference set for each predetermined position based on the thickness distribution of the touch panel, using drive and sense lines to adjust capacitance detection, facilitating accurate indicator positioning and reducing erroneous detection by setting appropriate detection references at varying thickness points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the touch panel size is increased, then the display area and operational capability are improved, but variations in thickness occur within the detection surface leading to detection difficulties
Solution Approach 1:
The patent applies local quality by setting different detection reference values for different regions of the detection surface. The detection reference setting unit divides the detection surface into multiple regions and assigns specific reference values to each region based on local thickness characteristics. This allows the system to adapt to local variations in thickness without requiring the entire panel to have uniform thickness, thereby resolving the contradiction between large area and thickness uniformity.
2Ease of operation
If a single detection reference is used for the entire detection surface, then the system is simple to operate, but detection accuracy deteriorates in regions with thickness variations
Solution Approach 1:
The patent applies segmentation by dividing the detection surface into multiple regions, each with its own detection reference value. The detection reference setting unit automatically determines appropriate reference values for each region based on thickness measurements, eliminating the need for manual configuration while maintaining high detection accuracy across varied thickness regions.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the detection reference values based on the actual thickness characteristics of different regions. Instead of using a fixed reference value, the system modifies the reference parameter to match local conditions, thereby maintaining detection accuracy across regions with varying thickness while keeping the operation simple through automated adjustment.
3Measurement precision
If the detection reference is set to facilitate detection in thick regions, then detection accuracy improves in those regions, but erroneous detection occurs in other regions
Solution Approach 1:
The patent resolves this contradiction by applying local quality through region-specific detection reference values. Each region's reference value is optimized for its local thickness characteristics, preventing both missed detections in thick regions and erroneous detections in other regions. This localized approach ensures high detection accuracy and reliability across the entire detection surface simultaneously.
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
Enhances indicator detection accuracy by setting tailored detection references for each position, preventing detection difficulties and erroneous readings, even in regions with significant thickness variations, thereby improving user operation recognition in electronic information devices.
Implementation Method 1
it is determined whether or not the indicator is in contact with or close to the detection surface based on an output signal outputted by the touch panel
Data Source
AI summary
A touch panel system (1) includes: a touch panel (3) for outputting an output signal in accordance with a presence or absence of an indicator that is in contact with or close to a detection surface P; and an indicator position detection unit (5) for detecting a position of the indicator within the detection surface (P) based on the output signal outputted by the touch panel (3). The indicator position detection unit (5) detects the position of the indicator within the detection surface (P) by use of a detection reference that is set for each predetermined position within the detection surface (P).