Flexible Touch Screen Defect Detection Line Design
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Solution Overview
Problem
Conventional flexible display panels are prone to micro-cracks during the peeling process of the polyimide layer, leading to defects that damage internal wiring and thin film encapsulation structures, causing touch screens to malfunction.
Innovation Solution
A flexible touch-screen structure comprising a substrate with intersecting transmitting and receiving electrodes, a driving chip with defect detecting lines, and an inorganic circuit layer that surrounds the electrodes, allowing for quick detection of peripheral defects by measuring electrical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the glass plate is peeled off from the polyimide layer during the manufacturing process, then the flexible screen can be separated from the substrate, but micro-cracks are generated and extended causing defects
Solution Approach 1:
The patent introduces a release pattern layer with a specific structure (including a release hole and protrusion) that is prepared in advance during manufacturing. This preliminary structural design enables controlled peeling by concentrating stress at specific points (protrusions) rather than distributing it across the entire interface, thereby preventing micro-crack formation in the flexible screen while still allowing successful separation from the substrate.
2Productivity
If micro-cracks are not detected early, then production continues, but defects damage internal wiring and encapsulation structures causing malfunction
Solution Approach 1:
The patent introduces a release pattern layer as an intermediary structure between the flexible screen and substrate. This layer includes a release hole and protrusion that act as a mediator to concentrate peeling stress at specific locations, preventing stress distribution across the flexible screen that would cause micro-cracks. The intermediary structure enables controlled separation while protecting the integrity of internal components.
3Ease of operation
If the polyimide layer is peeled off completely, then the flexible screen is freed from the substrate, but tension causes micro-cracks to enlarge and extend
Solution Approach 1:
The patent segments the peeling process by introducing a release pattern layer with a release hole and protrusion structure. Instead of peeling the entire interface at once which distributes stress uniformly and causes micro-cracks, the design concentrates the peeling action at specific segmented points (protrusions), allowing controlled separation that maintains flexible screen integrity while achieving complete freedom from the substrate.
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 the extension of micro-cracks inward, enabling efficient quality control and reducing product instability, thus improving the reliability and reducing customer complaints.
Implementation Method 1
The driving chip feeds back whether the periphery of the substrate is defective by measuring an electrical signal of the at least one defect detecting line
Data Source
AI summary
A flexible touch-screen structure and a manufacturing method of the flexible touch-screen structure are provided. The flexible touch-screen structure includes a substrate, a pattern layer, and a driving chip. The pattern layer is arranged on the substrate and has transmitting electrodes and receiving electrodes. The transmitting electrodes and the receiving electrodes are spaced apart from each other and arranged in directions that intersect each other. The driving chip is placed on one end of the substrate. The driving chip includes at least one defect detecting line and multiple conductive lines. The transmitting electrodes and the receiving electrodes are spaced from and surrounded by the at least one defect detecting line which is placed adjacent to a periphery of the substrate. The conductive lines are electrically connected to the transmitting electrodes and the receiving electrodes.