Organic Pattern Design for Display Sensor Integration
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Solution Overview
Problem
Current display devices face challenges in integrating efficient input sensors directly onto the display panel without compromising the display area or increasing the device's complexity, while maintaining a compact and user-friendly design.
Innovation Solution
A display device design that incorporates a sensing electrode and organic pattern on the display panel, with a multi-layer encapsulation structure including inorganic and organic layers, supports the signal line and light emitting elements, and features a unique organic pattern configuration to manage tensile forces and maintain a flat surface, enabling direct integration of the input sensor without additional adhesive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a sensing electrode and signal line are integrated directly onto the display panel, then the device complexity is reduced and compactness is improved, but the display area is compromised and manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The display panel is divided into a display area and a peripheral area. The sensing electrode is disposed on the display panel and at least partially overlaps the display area, while the signal line is disposed on the display panel and at least partially overlaps the peripheral area. This spatial segmentation allows the sensing function to be integrated without significantly compromising the display area, as the signal line and associated structures are confined to the peripheral region.
Solution Approach 2:
The patent utilizes the vertical dimension by implementing a multi-layer encapsulation structure. The first encapsulation inorganic layer, encapsulation organic layer, and second encapsulation inorganic layer are stacked vertically to support the signal line and manage tensile forces. This vertical arrangement allows integration of sensing components without increasing the horizontal footprint of the display area.
2Stability of the object's composition
If additional adhesive layers are added to support the sensing electrode and signal line, then structural stability is improved, but the device complexity and thickness increase
Solution Approach 1:
The encapsulation layers serve multiple functions simultaneously: they encapsulate the light emitting element for protection, provide mechanical support for the signal line, and manage tensile forces in the display panel. By merging these functions into a single multi-layer structure rather than adding separate adhesive layers, the patent maintains structural stability while avoiding increased device complexity.
Solution Approach 2:
The first encapsulation inorganic layer and second encapsulation inorganic layer are designed to perform multiple roles: protecting the organic pattern, supporting the signal line mechanically, and managing tensile forces during panel flexing. This multi-functional design eliminates the need for additional dedicated adhesive or support layers, maintaining both structural stability and device simplicity.
3Strength
If the organic pattern is made thicker to support the signal line, then mechanical strength is improved, but the surface flatness and display quality deteriorate
Solution Approach 1:
The organic pattern is designed with non-uniform thickness: the first portion disposed outside of the first line pattern has a greater average thickness than the second portion disposed inside the first line pattern. This local variation provides enhanced mechanical strength where needed (outside the line pattern) while maintaining surface flatness where the display area is located (inside the line pattern), thus resolving the contradiction between strength and flatness.
Solution Approach 2:
The patent manages the thickness issue by utilizing the vertical dimension through the multi-layer encapsulation structure. The first encapsulation inorganic layer, encapsulation organic layer, and second encapsulation inorganic layer are stacked to provide mechanical support and distribute tensile forces vertically, allowing the organic pattern to maintain appropriate thickness without compromising surface flatness in the display area.
4Adaptability or versatility
If the display panel is made flexible for rollable and foldable applications, then adaptability is improved, but tensile forces increase and reliability decreases
Solution Approach 1:
The multi-layer encapsulation structure is designed in advance to manage tensile forces that will occur during flexing. The first encapsulation inorganic layer, encapsulation organic layer, and second encapsulation inorganic layer are configured to distribute and absorb tensile stresses before they can cause damage to the organic pattern or other sensitive components, thereby maintaining reliability in flexible applications.
Solution Approach 2:
The encapsulation structure combines different material types: inorganic layers (first encapsulation inorganic layer and second encapsulation inorganic layer) and an organic layer (encapsulation organic layer). This composite structure leverages the complementary properties of inorganic materials (tensile strength, barrier properties) and organic materials (flexibility, stress distribution) to maintain both adaptability for flexing and reliability under tensile forces.
Data Source
AI summary
A display device includes a display panel and an input sensor. The display panel includes an encapsulation organic layer disposed inside a first line pattern. An organic pattern includes a first portion disposed outside of the first line pattern and a second portion disposed inside of the first line pattern and at least partially overlapping the encapsulation organic layer. The organic pattern supports a signal line of the input sensor.