Pressure Sensor Electrode Openings for Capacitance Precision
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Solution Overview
Problem
Existing display devices with pressure sensors face challenges in accurately measuring pressure due to inconsistent capacitance changes and sensitivity issues, particularly when the pressure sensor is not precisely aligned with the pressure applying area.
Innovation Solution
The display device incorporates a pressure sensor configuration with a first and second electrode, an insulating member with elasticity, and a pressure sensing circuit, where the first non-overlapping electrode has openings to reduce initial capacitance and enhance capacitance difference upon pressure application, ensuring accurate and constant sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure sensor uses a conventional electrode structure without openings, then the initial capacitance is higher, but the capacitance difference upon pressure application is reduced, leading to decreased measurement precision
Solution Approach 1:
The patent applies the porous materials principle by introducing opening portions in the non-overlapping electrode and insulating member. These openings create a porous structure that reduces the initial capacitance value while allowing pressure to be effectively transmitted to the overlapping electrode region. The porous structure maintains mechanical integrity while enabling better capacitance modulation under pressure, thus improving measurement precision and sensitivity consistency.
Solution Approach 2:
The patent applies parameter changes by modifying the physical structure of the electrode and insulating member through the introduction of opening portions. This structural parameter change directly affects the capacitance parameters - reducing initial capacitance while enhancing the capacitance change ratio under pressure. The opening portions alter the electrical field distribution and mechanical deformation characteristics, leading to improved pressure sensing performance.
2Measurement precision
If the pressure sensor is not precisely aligned with the pressure applying area, then the device complexity is reduced, but the measurement precision deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring the opening portions in the non-overlapping electrode and insulating member to optimize the capacitance characteristics before pressure application. This preliminary structural design ensures that the pressure sensor maintains consistent sensitivity across different alignment conditions, reducing the criticality of precise alignment during installation while preserving measurement accuracy.
Solution Approach 2:
The patent applies local quality by creating non-uniform structures through the opening portions in specific regions of the electrode and insulating member. This local modification concentrates the capacitance change in the overlapping region while maintaining structural stability elsewhere, enabling accurate pressure sensing even when global alignment is not perfect.
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
This configuration allows for precise measurement of pressure applied to a specific position, maintaining consistent sensitivity and accuracy by increasing the capacitance difference, thereby improving the overall pressure sensing performance.
Implementation Method 1
an insulating member disposed between the first electrode and the second electrode and having elasticity
Implementation Method 2
The pressure sensor may detect a pressure by sensing a change in capacitance, which is caused by a change in distance between the two electrodes by a touch input
Data Source
AI summary
A display device includes a display panel and a pressure sensor. The display panel displays a pressure sensing image which induces a user to apply a pressure in a specific situation. The pressure sensor is disposed under the display panel, and a portion of the pressure sensor overlaps with the pressure sensing image. An opening portion is defined in a part of an electrode of the pressure sensor that does not overlap with the pressure sensing image.