Rollable Display Resistor Sensor Curvature Detection
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Solution Overview
Problem
Existing rollable display technologies face challenges in accurately detecting the rolling area of a rollable display panel due to uniform resistance values, leading to inefficient power consumption and inaccurate curvature detection.
Innovation Solution
Incorporating a resistor sensor with sensing materials of varying resistance values based on curvature, arranged in specific shapes and materials such as metal nanowires or lead zirconate titanate, to output a sensing signal proportional to the rolling length, allowing for precise detection of the rolling area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If uniform resistance value sensing material is used in the rollable display panel, then the device structure is simple and manufacturing is easier, but the curvature detection precision is insufficient and rolling area detection is inaccurate
Solution Approach 1:
The patent applies local quality by dividing the sensing material into multiple regions with different resistance values based on their position relative to the rolling axis. Regions closer to the rolling axis have different resistance characteristics than regions farther away, enabling accurate detection of curvature variations at different locations of the rollable display panel.
Solution Approach 2:
The sensing material is segmented into multiple distinct regions with different resistance values. This segmentation allows each region to contribute differently to the overall sensing signal, providing detailed information about the curvature state at various positions and improving the accuracy of rolling area detection.
2Measurement precision
If the resistor sensor uses sensing material with varying resistance values by location, then the rolling area detection accuracy is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent changes the resistance parameter of the sensing material across different locations to optimize detection accuracy. By carefully designing the resistance value distribution pattern, the system achieves high-precision rolling area detection while the resistance variations can be incorporated into existing manufacturing processes through controlled deposition or doping techniques.
3Reliability
If the sensing material area decreases as curvature decreases, then the resistance value increases providing better sensing signal, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs composite material structures or patterns in the sensing material that combine different geometric configurations. These composite designs provide the desired relationship between area and resistance while being more tolerant to manufacturing variations, as the overall sensing performance emerges from the combined effect of multiple elements rather than requiring precise control of a single complex geometry.
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 the rolling area, reducing power consumption by distinguishing between curved and flat regions, thereby optimizing the operation of the rollable display panel.
Implementation Method 1
The resistance value of the sensing material changes according to a pressure applied thereto
Implementation Method 2
the resistor sensor outputs a sensing signal based on a sum of the resistance values of the sensing material
Data Source
AI summary
A rollable display panel and a rollable display device, the rollable display panel including a display region configured to display an image; a non-display region surrounding the display region; and a resistor sensor in the non-display region including sensing material of which resistance values are different by location, wherein the resistor sensor outputs a sensing signal that is regularly changed proportional to a rolling length of the rollable display panel, and a sensor driver that determines a driving region of the rollable display panel based on the sensing signal.