Touch Signal Line Bank Structure for Delamination-Resistant Displays
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Solution Overview
Problem
The patterning process of touch lines in display devices often results in defects such as delamination of layers due to leakage of organic material along inclined surfaces, which is caused by insufficient photoresist thickness.
Innovation Solution
A display device and manufacturing method that includes a thickening pattern overlapping the inclined intermediate part of the first section, preventing leakage and delamination by ensuring adequate photoresist thickness and forming a bank to prevent abnormal patterning of touch signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photoresist is deposited on inclined surfaces during touch line patterning, then the patterning process can proceed, but the photoresist thickness becomes insufficient leading to leakage and delamination
Solution Approach 1:
The patent applies preliminary action by forming a bank structure before depositing the photoresist layer. This bank structure pre-establishes a foundation that ensures adequate photoresist thickness in inclined portions, preventing leakage and delamination issues that would otherwise occur during the patterning process.
Solution Approach 2:
The patent implements local quality by creating a bank structure with specific geometric characteristics (inclined surfaces at controlled angles) that locally modifies the substrate topology. This localized structural modification ensures uniform photoresist thickness distribution in critical areas while maintaining the overall patterning process integrity.
2Ease of manufacture
If layers are deposited along inclined surfaces to form touch lines, then the touch line structure can be created, but non-uniform layer thickness results causing delamination
Solution Approach 1:
The bank structure is formed in advance as a preliminary step, providing a controlled geometric foundation before subsequent layer deposition. This pre-formed structure guides the deposition process to achieve uniform thickness even on inclined surfaces, resolving the contradiction between structural formation ease and thickness precision.
Solution Approach 2:
The bank structure acts as an intermediary element between the substrate and the layers to be deposited. It mediates the deposition process by providing a controlled surface geometry that ensures uniform photoresist and subsequent layer thickness, enabling both easy structure formation and precise thickness control.
3Productivity
If organic material is deposited on inclined surfaces during etching, then touch lines can be formed, but material leakage occurs causing delamination defects
Solution Approach 1:
The bank structure is prepared in advance to provide adequate thickness support for the photoresist and organic material layers. This preliminary structural preparation prevents material leakage during etching while maintaining efficient touch line patterning, eliminating defects without sacrificing productivity.
Solution Approach 2:
The bank structure provides beforehand cushioning by creating a thicker foundational layer that cushions against material leakage during the etching process. This pre-established structural support prevents delamination defects while allowing the patterning process to proceed efficiently.
Data Source
AI summary
A display device including a substrate having a display area and a peripheral area defined outside the display area, a circuit layer disposed on the substrate, a device layer disposed on the display area, an encapsulation layer covering the device layer, a touch sensing unit including at least one touch insulating layer disposed on the encapsulation layer, touch electrodes disposed on the encapsulation layer, and touch signal lines connected to the touch electrodes, a first section disposed in the peripheral area and including a first part having a first thickness, a second part having a second thickness less than the first thickness and overlapping the touch signal lines, and an intermediate part connecting the first part and the second part and being inclined, and a first thickening pattern overlapping at least the intermediate part.