Flexible Display Bending Sensor with Integrated Reference Resistor
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Solution Overview
Problem
Conventional flexible display devices face challenges in accurately sensing overall deformation, stress, and strain due to the thickness and elasticity of strain gauges, which affects their ability to measure bending and twisting, and also suffer from output offset voltage issues and increased production costs.
Innovation Solution
A flexible display device with a bending sensing system that includes bending sensors and reference resistors mounted in tensioned and compressed layers, allowing for improved resistance variation measurement and reduced temperature-dependent deviations, while also enabling the differentiation between bending and twisting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauges are used to sense bending, then bending can be detected, but the thickness and elasticity of the strain gauges affect measurement accuracy of overall deformation
Solution Approach 1:
The patent extracts the reference resistor from the external environment and integrates it directly into the flexible display device structure. This eliminates the need for external components that cause wiring complexity and measurement errors, while maintaining the strain gauge functionality for bending detection.
Solution Approach 2:
The integrated reference resistor serves multiple functions: it provides a stable reference for Wheatstone bridge measurements, compensates for temperature variations, and eliminates the need for separate external reference components. This multi-functionality improves measurement accuracy without adding device complexity.
2Measurement precision
If external resistors are used in the measurement circuit, then resistance variation can be measured, but output offset voltage increases and temperature-dependent resistance deviation occurs
Solution Approach 1:
The patent introduces an integrated reference resistor as an intermediary element within the flexible display device. This reference resistor acts as a mediator that compensates for temperature effects and provides a stable baseline for resistance measurements, thereby reducing output offset voltage and temperature-dependent deviations.
Solution Approach 2:
The patent changes the physical location and thermal environment parameters of the reference resistor by integrating it into the flexible display device structure. This parameter change allows the reference resistor to experience the same temperature variations as the strain gauges, enabling effective temperature compensation and reducing measurement errors.
3Measurement precision
If bending sensors are mounted on the flexible display device, then bending can be sensed, but production costs increase
Solution Approach 1:
The patent merges the reference resistor with the flexible display device structure, combining multiple functional elements into a single integrated system. This merging eliminates the need for separate external components and reduces assembly steps, thereby lowering production costs while maintaining bending sensing capability.
Solution Approach 2:
The integrated reference resistor provides multiple functions including temperature compensation and measurement reference, reducing the need for additional components. This multi-functionality simplifies the manufacturing process and reduces production costs while maintaining accurate bending sensing.
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 solution enhances the accuracy of bending angle measurement, reduces manufacturing costs, and improves signal-to-noise ratio, allowing for precise sensing of bending and twisting without additional processing steps.
Implementation Method 1
The strain gauge has a characteristic in that the resistance between terminals varies depending on physical tension (elongation) and compression (contraction)
Data Source
AI summary
Disclosed herein is a flexible display device having a bending sensing device configured such that an external resistor is mounted in the flexible display device together with a bending sensor, whereby it is possible to lower an output offset voltage, to reduce resistance deviation depending on temperature change, and to sense twisting of the flexible display device. The bending sensing device includes at least one bending sensor mounted in a bending region of a film (layer) that is tensioned and/or a film (layer) that is compressed when the flexible display device, including a plurality of films (layers), is bent and at least one reference resistor mounted in a non-bending region of the film (layer) that is tensioned and/or the film (layer) that is compressed.