Flexible Display Touch Panel Stress Distribution via Segmented Bridge Electrodes
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Solution Overview
Problem
Flexible display devices with touch panels face challenges in maintaining functionality under external stress, such as tensile or compressive stress, particularly at crossing parts where single bridge electrodes are vulnerable to damage.
Innovation Solution
The implementation of a touch panel design with intersecting first and second touch sensors, where the second touch sensor includes conductive lines that are partially disconnected to form a mesh shape, and connection electrodes connect these lines in a way that they are insulated from the first conductive lines, distributing stress and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single bridge electrode is used to connect sensor parts at crossing parts, then the touch panel structure is simple, but the crossing parts are vulnerable to damage under external stress
Solution Approach 1:
The bridge electrode is divided into multiple segments (first bridge electrode and second bridge electrode) that are spatially separated. The first bridge electrode connects first sensor parts while the second bridge electrode connects second sensor parts, creating redundant connection paths that distribute mechanical stress and prevent single-point failure at crossing parts.
Solution Approach 2:
The patent introduces a dual-layer electrode architecture where bridge electrodes are arranged in different spatial dimensions/planes. The first bridge electrodes operate in one dimension while second bridge electrodes operate in another dimension, allowing stress to be distributed across multiple spatial planes rather than concentrated at a single crossing point.
2Reliability
If multiple conductive lines are added to form mesh shapes and distribute stress, then the reliability under stress improves, but the device complexity increases
Solution Approach 1:
The first and second bridge electrodes serve dual functions: they electrically connect adjacent sensor parts while simultaneously acting as stress-distributing structural elements. The mesh-shaped conductive lines provide both electrical connectivity and mechanical reinforcement, eliminating the need for separate structural support layers.
Solution Approach 2:
The patent merges the electrical connection function and mechanical reinforcement function into a single integrated electrode system. The bridge electrodes that connect sensor parts also form mesh structures that distribute stress, combining multiple functions into unified structural elements rather than separate components.
Data Source
AI summary
A flexible display device including a display panel including a base surface, a first touch sensor disposed on the base surface, and a second touch sensor disposed on the base surface and intersecting the first touch sensor. The first touch sensor includes first sensor parts, each of the first sensor parts comprising first conductive lines, and a first crossing part connecting two adjacent first sensor parts, the first crossing part comprising second conductive lines. The second touch sensor includes second sensor parts, each of the second sensor parts including third conductive lines, and a second crossing part including fourth conductive lines disposed between the second conductive lines, and a first connection electrode connecting the third conductive lines to the fourth conductive lines and insulated from the second conductive lines.