Flexible Display Bending Sensor Voltage Output
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Solution Overview
Problem
Conventional flexible display devices face challenges in accurately sensing overall deformation and measuring stress and strain due to the thickness and elasticity mismatch between strain gauges and the display device, leading to inaccurate deformation measurement and increased production costs.
Innovation Solution
Mounting bending sensors in layers that are either tensioned or compressed within the flexible display device, utilizing a bridge circuit configuration with specific resistor connections to enhance voltage output and improve signal accuracy, allowing for accurate stress and strain measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauges are mounted on the surface of the flexible display device, then the device can sense bending, but the thickness and elasticity mismatch between strain gauges and the display device leads to inaccurate deformation measurement
Solution Approach 1:
The strain gauges are embedded within the flexible display device structure rather than mounted on the surface. Specifically, the strain gauges are positioned in the tensile region and compressive region within the layered structure of the display device, allowing them to experience the same deformation as the device itself. This nesting approach eliminates the mismatch between sensor and substrate elasticity, improving measurement accuracy.
Solution Approach 2:
The patent transitions from surface-mounted sensing to volumetric embedding within the device structure. By placing strain gauges within the layered architecture (specifically in regions experiencing tension and compression during bending), the system captures deformation from multiple dimensional perspectives, improving the accuracy of overall deformation measurement.
2Measurement precision
If bending sensors are disposed at the edge of the flexible display device, then the device can sense shape, but the output voltage magnitude is insufficient
Solution Approach 1:
The patent applies local quality by positioning strain gauges in specific regions where maximum stress occurs during bending - namely the tensile region and compressive region. This localized placement ensures that the strain gauges experience the highest possible strain magnitude, thereby maximizing voltage output. The bridge circuit configuration further enhances this by utilizing the differential response between tension and compression regions.
Solution Approach 2:
The patent changes the operational parameters of the sensing system by using a bridge circuit configuration that converts resistance variations from strain gauges into voltage variations. The circuit is designed to amplify the voltage output by utilizing the differential resistance changes in the tensile and compressive regions, transforming small resistance signals into larger voltage signals suitable for processing.
3Measurement precision
If additional signal routing processes are implemented, then accurate sensing can be achieved, but manufacturing costs increase
Solution Approach 1:
The patent merges the signal routing function with the existing display device structure. The strain gauges are integrated into the layered architecture, and signal transmission is achieved through existing conductive pathways within the device structure. This eliminates the need for separate, additional routing processes and reduces manufacturing complexity while maintaining sensing accuracy.
Solution Approach 2:
The patent makes the display device structure multi-functional by serving both as the display medium and as the sensing structure. The same layered architecture that provides display functionality also houses the strain gauges and enables signal transmission. This universal approach eliminates the need for dedicated sensing components and routing infrastructure, reducing manufacturing costs.
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 increases the magnitude of voltage output, enhances signal-to-noise ratio, and reduces manufacturing costs by eliminating the need for additional signal routing processes, enabling more reliable bending angle sensing and deformation measurement.
Implementation Method 1
The strain gauge has a characteristic in that the resistance between terminals varies depending on physical tension (elongation) and compression (contraction)
Implementation Method 2
The bridge circuit 210 is realized by a Wheatstone bridge, which includes one or more strain gauges. Since the resistance variation of each of the strain gauges is very small, the Wheatstone bridge is configured, as shown in FIG. 2, in order to convert resistance variation into voltage variation
Data Source
AI summary
Disclosed herein is a flexible display device having a bending sensor mounted in a layer that is tensioned or a layer that is compressed in order to increase the magnitude of voltage output from the bending sensor. The flexible display device includes at least two bending sensors mounted in a layer that is tensioned and/or a layer that is compressed when the flexible display device, including a plurality of layers, is bent.