Resistive Pressure Sensing Panel for Magnetic Immunity

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing strain sensors used in devices like robots and flexible display screens are prone to interference from external magnetic fields, affecting their accuracy in detecting deformation.

Innovation Solution

A pressure sensing panel with a matrix arrangement of strain sensing units, each comprising a switching transistor, a first resistive pressure sensing electrode, and a second resistive pressure sensing electrode, where the electrodes are arranged on opposite flexible substrates, allowing for high sensitivity and resistance-based deformation detection independent of magnetic fields.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If electromagnetic force-based sensing elements are used for deformation detection, then distance change between sensing elements can be detected, but the sensing elements are easily disturbed by external magnetic fields

Engineering Contradiction:

Improvedeformation detection accuracyVSAvoidmagnetic field interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent replaces electromagnetic force-based sensing with resistance-based sensing. The strain sensing unit uses resistive pressure sensing electrodes whose resistance changes with deformation, eliminating dependence on electromagnetic fields. The switching transistor controls current flow through the resistive electrodes, and voltage changes are detected without using electromagnetic force for the actual sensing mechanism.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the sensing parameter from electromagnetic force to electrical resistance. The resistive pressure sensing electrodes are designed so that their resistance varies with applied strain, allowing deformation detection through resistance measurement rather than electromagnetic interaction. This parameter change makes the sensing immune to magnetic field interference.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If multiple sensing elements are arranged in a matrix with scanning lines and signal reading lines, then comprehensive deformation monitoring is achieved, but the device structure becomes more complex

Engineering Contradiction:

Improvedeformation monitoring coverageVSAvoidsensing unit structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent combines multiple functions into a single integrated sensing unit structure. Each sensing unit integrates the switching transistor, first resistive pressure sensing electrode, and second resistive pressure sensing electrode into one modular unit. This merging allows comprehensive deformation monitoring through the matrix arrangement while keeping each individual unit relatively simple and manageable.

Inventive Principle:

Principle #5Merging (Combining)

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 provides accurate deformation detection with high sensitivity and resistance-based measurement, unaffected by magnetic fields, while enabling the lightening and thinning of the pressure sensing panel.

Implementation Method 1

deformation is detected by resistance change due to the deformation

Methodology Applied

Scientific EffectPiezoresistive effect: Piezoresistive Effect

Implementation Method 2

a switching transistor, a first resistive pressure sensing electrode and a second resistive pressure sensing electrode

Methodology Applied

Scientific EffectField effect transistor operation:

Data Source

PatentUS11281323B2Pressure sensing panel and display device

Publication Date: 2022.03.22 SHANGHAI TIANMA MICRO ELECTRONICS CO LTD

AI summary

The present disclosure discloses a pressure sensing panel and a display device. A strain sensing unit includes a switching transistor, a first resistive pressure sensing electrode and a second resistive pressure sensing electrode. The first reference voltage line and the second reference voltage line have a potential difference when the switching transistor is switched on. When the pressure sensing panel is deformed, the resistances of the first resistive pressure sensing electrode and the second resistive pressure sensing electrode change due to deformation of the first resistive pressure sensing electrode and the second resistive pressure sensing electrode at corresponding positions, which leads to a change in voltage between the first resistive pressure sensing electrode and the second resistive pressure sensing electrode. Then voltage signals output through the signal reading line will change, and deformation of the pressure sensing panel can be obtained through analyzing the output voltage signal.