Foldable Display Input Sensor Electrode Layout for Accurate Touch Sensing
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Solution Overview
Problem
Existing display devices face issues with malfunctions in input sensors, particularly in flexible and foldable displays, due to the complexity of electrode configurations and interference from external factors.
Innovation Solution
The display device incorporates a specific electrode configuration with first and second electrodes extending in different directions, including sensing portions and bridges, along with dummy electrodes to enhance sensing accuracy and prevent malfunctions, and is designed with a foldable structure using a polarizer and adhesive member for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simple electrode configuration is used, then the device complexity is reduced, but the sensing accuracy deteriorates
Solution Approach 1:
The first electrode is divided into multiple segments including a first main portion, first sensing portions, and second sensing portions. This segmentation allows each portion to perform specific sensing functions, improving overall sensing accuracy while maintaining manageable complexity through modular design
Solution Approach 2:
The electrode configuration transitions from simple linear arrangements to multi-dimensional structures with sensing portions extending in different directions (first direction and second direction). This dimensional expansion enables detection of inputs from multiple orientations, enhancing sensing accuracy without proportionally increasing complexity
2Measurement precision
If multiple sensing portions are added to improve sensing accuracy, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Multiple sensing portions (first sensing portions and second sensing portions) are merged into a single integrated first electrode structure. This consolidation allows the electrode to function as a unified component with multiple sensing capabilities, improving measurement precision while avoiding the complexity of separate electrode assemblies
Solution Approach 2:
The first electrode serves multiple functions simultaneously: it acts as a signal line in the first direction and as sensing portions in the second direction. This multi-functionality reduces the need for separate dedicated sensing electrodes, thereby improving sensing accuracy without proportionally increasing device complexity
3Measurement precision
If a complex electrode configuration with multiple portions is used, then the sensing accuracy is improved, but the reliability deteriorates due to more potential failure points
Solution Approach 1:
The first electrode integrates multiple sensing portions and signal line functions into a single continuous conductive structure. This merging reduces the number of discrete components and connection points, thereby maintaining sensing accuracy while improving reliability by eliminating potential failure points at component interfaces
Solution Approach 2:
The first electrode performs both signal transmission and sensing functions within a single structure. This multi-functionality reduces the overall component count and interconnections required, thereby improving reliability while maintaining the enhanced sensing capabilities provided by the multiple sensing portions
4Adaptability or versatility
If electrodes are arranged to detect inputs from multiple directions, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The first electrode is designed to detect inputs from multiple directions (first direction and second direction) using its integrated sensing portions. This multi-directional sensing capability is achieved within a single electrode structure, improving adaptability without requiring separate electrode systems for each direction, thereby controlling complexity
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
The solution effectively prevents malfunctions in input sensors, ensuring reliable operation of flexible and foldable displays by improving sensing accuracy and structural integrity.
Implementation Method 1
an input sensor disposed on the display panel and including a first electrode extending in a first direction and a second electrode extending in a second direction crossing the first direction
Data Source
AI summary
An input sensor including a first electrode and a second electrode, which cross each other. The first electrode includes a first main portion extending in a first direction and first sensing portions and second sensing portions, which are disposed with the first main portion therebetween in a second direction and each of which extends from the first main portion. Each of the first sensing portions and the second sensing portions includes first sub-portions extending in the first direction and first middle portions disposed between the first sub-portions and between one of the first sub-portions and the first main portion.