Bendable Display Piezoelectric Actuator Stress Management
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Solution Overview
Problem
Bendable display apparatuses face issues with isolation and damage to stacked structures when bent, due to pressure variations that can cause stress and lead to structural integrity problems.
Innovation Solution
Incorporating a substrate with a bending area and piezoelectric devices that contract or expand based on pressure variations sensed by a pressure sensor, such as a strain gauge, to manage stress and prevent damage by adjusting the volume of the piezoelectric devices accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display apparatus is made flexible by including a flexible substrate that can be bent, then the adaptability and versatility of the display apparatus are improved, but the structural integrity and reliability of the stacked structures deteriorate due to isolation and damage during bending
Solution Approach 1:
The patent applies parameter changes by utilizing the piezoelectric effect to dynamically adjust the physical state of the piezoelectric device in response to bending-induced pressure changes. The piezoelectric device changes its electrical and mechanical parameters (expansion/contraction) based on the applied stress, thereby adapting to maintain structural integrity during bending operations.
Solution Approach 2:
The patent converts the harmful effect of bending pressure that causes isolation and damage into a beneficial signal. The pressure sensor detects the bending-induced pressure changes, and this information is used to control the piezoelectric device to expand or contract, compensating for the stress and preventing structural damage. The harmful mechanical stress is transformed into useful control information.
2Strength
If the stacked structures are rigid to maintain structural integrity, then the strength and reliability are improved, but the ease of operation and adaptability deteriorate as the display apparatus cannot be bent
Solution Approach 1:
The patent applies dynamics by making the piezoelectric device adjustable and responsive to changing conditions. Instead of a static rigid structure, the piezoelectric device dynamically changes its state (expands or contracts) based on real-time pressure feedback from the pressure sensor during bending, allowing the structure to adapt its properties as needed.
Solution Approach 2:
The patent implements feedback through the pressure sensor that continuously monitors pressure changes during bending and uses this information to control the piezoelectric device. The sensor output feeds back to the control system, which adjusts the piezoelectric device's state to compensate for bending stresses, creating a closed-loop system that maintains structural integrity during flexible operations.
3Adaptability or versatility
If the display apparatus is bent, then the adaptability is improved, but the harmful factors increase due to pressure variations causing stress and isolation of stacked structures
Solution Approach 1:
The patent applies preliminary anti-action by using the piezoelectric device to counteract the harmful effects of bending before damage occurs. The pressure sensor detects early signs of bending-induced stress, and the piezoelectric device is activated to expand or contract in opposition to the harmful stress, preventing isolation and damage to the stacked structures before they occur.
Solution Approach 2:
The patent converts the harmful bending pressure into a beneficial control signal. The pressure sensor transforms the mechanical stress into electrical signals that control the piezoelectric device, which then generates a counteracting force to protect the stacked structures. The harmful pressure becomes the driving force for the protective mechanism.
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 reduces the risk of isolation and damage to the stack structures during bending by dynamically responding to pressure changes, ensuring the structural integrity and functionality of the display apparatus.
Implementation Method 1
The first piezoelectric device may be configured to contract or expand according to a pressure variation sensed by the pressure sensor
Implementation Method 2
The pressure sensor may sense the pressure variation depending on a resistance variation of the first wire
Data Source
AI summary
A display apparatus includes a substrate including a first area, a second area, and a bending area, the bending area disposed between the first area and the second area and bending about a bending axis running along a first direction; a first piezoelectric device disposed over the bending area; and a pressure sensor. The first piezoelectric device is configured to contract or expand according to a pressure variation sensed by the pressure sensor.