Surrounding Organic Pattern Isolates Outer Power Line Static Charge
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Solution Overview
Problem
Self-luminous display devices face issues with film lifting and moisture permeation due to static electricity, particularly around the outer power line, which complicates manufacturing and affects the display structure, and embedding a touch sensor in the panel increases device thickness and complexity.
Innovation Solution
A display device structure is developed with a surrounding organic pattern and insulating layers to prevent film lifting and moisture permeation by isolating the outer power line from static electricity, including a closed or open ring-type organic layer surrounding the encapsulation layer and positioned between dams, and an insulating layer between the touch routing line and the outer power line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer power line is disposed in the non-display area, then power supply function is achieved, but film lifting and moisture permeation occur due to static electricity
Solution Approach 1:
A ground line is introduced as an intermediary element between the outer power line and the surrounding environment. The ground line serves as a mediator to dissipate static electricity charges that accumulate on the outer power line, preventing film lifting and moisture permeation while maintaining the power supply function. The ground line is disposed in the non-display area and electrically connected to a reference potential, providing a safe path for static charge dissipation.
Solution Approach 2:
The static electricity that causes harm through film lifting is converted into a beneficial effect by providing a controlled discharge path through the ground line. Instead of allowing static charges to accumulate and cause damage, the ground line provides a deliberate pathway for charge dissipation, transforming the harmful static electricity into a controlled electrical phenomenon that protects the display structure.
2Adaptability or versatility
If a touch sensor is embedded in the display panel, then touch input function is achieved, but device thickness and manufacturing complexity increase
Solution Approach 1:
The touch sensor structure is merged with the display panel structure by disposing the touch sensor electrode and routing line in the same non-display area where the outer power line is located. This integration allows the touch sensor to share the same structural space and manufacturing layers as the display panel, eliminating the need for separate touch panel manufacturing and assembly processes.
Solution Approach 2:
The non-display area structure is designed to serve multiple functions simultaneously: it provides power supply through the outer power line, enables touch sensing through the touch sensor electrode and routing line, and maintains display edge integrity. This multi-functional design eliminates the need for separate dedicated spaces for each function, reducing overall device complexity.
3Reliability
If the surrounding organic pattern surrounds the organic encapsulation layer, then film lifting and moisture permeation are blocked, but insulation between touch routing line and outer power line must be enhanced
Solution Approach 1:
An insulating layer is introduced as an intermediary element between the touch routing line and the outer power line. This insulating layer, disposed in the non-display area, provides electrical isolation between the two conductive elements while allowing the surrounding organic pattern to maintain its moisture barrier function. The insulating layer prevents direct electrical contact and potential short circuits between the touch routing line and outer power line.
4Reliability
If the surrounding organic pattern is disposed in the non-display area, then film lifting is prevented, but device size remains constrained with narrow bezel
Solution Approach 1:
The surrounding organic pattern is strategically disposed only in the non-display area where it is most needed for preventing film lifting and moisture permeation. By concentrating the protective function in this specific region rather than extending it across the entire display surface, the design maintains a narrow bezel width while still providing effective protection at the critical edge regions where the outer power line and touch sensor are located.
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area positioned outside the display area, a plurality of light emitting devices disposed in the display area, an encapsulation layer disposed on the plurality of light emitting devices and including an organic encapsulation layer, and a surrounding organic pattern disposed in the non-display area along the periphery of the organic encapsulation layer and surrounding the organic encapsulation layer, thereby preventing film lifting and moisture permeation defects caused by static electricity generated during the panel manufacturing process in advance.