Touch Sensor Strain Gauge Integration for Pressure Detection
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Solution Overview
Problem
Current display devices lack an effective method to integrate pressure sensing capabilities with touch sensors, limiting their ability to provide both touch position and pressure detection in a seamless and efficient manner.
Innovation Solution
A display device design that incorporates a touch sensor with a sensing area and a non-sensing area, featuring a first and second touch electrode unit and a pressure sensor with a strain gauge, where the strain gauge includes resistance lines connected in a direction parallel to the long sides of the display panel, enhancing pressure sensitivity and touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pressure sensor is integrated with a touch sensor in a display device, then pressure detection capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the pressure sensor and touch sensor into a single integrated structure where the strain gauge is positioned within the touch sensor's electrode configuration. This merging allows both touch position detection and pressure detection to be achieved through a unified sensor system, improving versatility while managing complexity through integration rather than separate components
Solution Approach 2:
The integrated sensor system performs multiple functions: it detects both touch position (through electrode capacitance changes) and pressure intensity (through strain gauge resistance changes). This multi-functionality is achieved within a single sensor structure, allowing the display device to replace physical buttons and provide enhanced user interaction capabilities
2Measurement precision
If the strain gauge is located in the sensing area of the touch sensor, then pressure sensitivity is improved, but manufacturing complexity increases
Solution Approach 1:
The strain gauge is specifically positioned within the sensing area of the touch sensor where pressure detection is most critical. This localized placement ensures high pressure sensitivity in the active sensing region while maintaining a clear distinction between the sensing area and non-sensing area, simplifying the manufacturing process by providing well-defined zones for different functions
Solution Approach 2:
The sensor is divided into distinct sensing area and non-sensing area regions, with the strain gauge specifically located in the sensing area. This segmentation allows for optimized pressure detection in the active region while keeping the manufacturing process manageable through clear spatial differentiation of functional zones
3Measurement precision
If resistance lines are arranged parallel to long sides of the display panel, then pressure detection accuracy is improved, but device thickness increases
Solution Approach 1:
The resistance lines of the strain gauge are arranged in a two-dimensional pattern within the plane of the display panel rather than extending in the thickness direction. This dimensional arrangement allows pressure detection accuracy to be improved through proper orientation of resistance lines parallel to the long sides, while maintaining a thin profile by utilizing the planar dimensions of the display panel
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 solution enables improved touch position and pressure detection sensitivity, allowing for more intuitive user interactions and potentially replacing physical buttons, while simplifying the manufacturing process without increasing the device's thickness.
Implementation Method 1
a pressure sensor including a strain gauge, at least a part of the strain gauge being located in the sensing area
Data Source
AI summary
A display device, includes: a display panel having short sides and long sides; and a touch sensor on the display panel and including a sensing area and a non-sensing area around the sensing area, wherein the touch sensor includes: a first touch electrode unit including a plurality of first touch electrodes in the sensing area, arranged in a direction in which the short sides of the display panel extend, and each including a first opening; a second touch electrode unit including a plurality of second touch electrodes in the sensing area, arranged in a direction in which the long sides of the display panel extend, and each including a second opening; and a pressure sensor including a strain gauge, at least a part of the strain gauge being located in the sensing area.