Flexible Display Bending Detection with Piezoresistive Sensors
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Solution Overview
Problem
Flexible display devices face challenges in accurately detecting bending angles and positions due to limitations in existing sensing technologies, which can lead to incorrect input recognition and user interface issues.
Innovation Solution
A flexible display device incorporating a bending detection screen with angle and position detection sensors made of materials with resistance that changes with applied stress, coupled with signal lines and a calculation unit to determine bending angles and positions, allowing for precise detection and differentiation between real and ghost bending events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing sensing technologies are used for bending detection, then the device structure remains simple, but the detection accuracy of bending angles and positions is insufficient
Solution Approach 1:
The sensing system is segmented into two distinct sensor types: angle detection sensors with constant area per unit length for detecting bending angles, and position detection sensors with increasing area per unit length for detecting bending positions. This segmentation allows each sensor type to be optimized for its specific detection function, improving overall measurement precision while maintaining manageable system complexity through modular design.
2Reliability
If bending detection is implemented to improve input recognition, then user interface reliability improves, but the risk of incorrect input recognition and ghost bending events increases without proper differentiation
Solution Approach 1:
The system employs feedback mechanisms where the controller receives detection results from both angle and position sensors, processes this information, and uses it to determine whether to execute or reject input commands. This feedback loop enables the system to differentiate between real bending events requiring input recognition and ghost bending events that should be rejected, thereby improving user interface reliability and preventing incorrect input recognition.
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
Enables accurate detection of bending angles and positions, improving input recognition and user interface reliability in flexible display devices by reducing defects and enhancing manufacturing ease.
Implementation Method 1
an angle detection sensor including a material with a resistance that changes in correspondence to an intensity of an applied stress
Implementation Method 2
an position detection sensor including a material with a resistance that changes in correspondence to an intensity of the applied stress
Data Source
AI summary
A flexible display device includes a flexible display panel to generate an image and a bending detection screen to detect a bending angle and a bending position. The bending detection screen includes an angle detection sensor and a position detection sensor. The angle detection sensor includes a material with a resistance that changes in correspondence to an intensity of an applied stress. The angle detection sensor has an area per unit length that is substantially constant on a base surface. The position detection sensor includes a material with a resistance that changes in correspondence to an intensity of the applied stress. The position detection sensor has an area per unit length that increases along a length direction on the base surface. Signal lines are connected to the angle and position detection sensors.