Display Panel Groove Encapsulation Against Edge Moisture Ingress
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Solution Overview
Problem
In display panels, water and oxygen can enter from the sides and affect the pixel circuit or driver circuit, leading to display issues due to the difficulty in covering the sides with an inorganic encapsulation layer.
Innovation Solution
A display panel design with a groove that encloses the driver circuit and an inorganic encapsulation layer covering the groove, where the minimum distance from the groove to the edge is less than the distance from the driver circuit to the edge, effectively blocking water and oxygen ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display panel uses a narrow bezel or no bezel form to reduce joint impact, then the display effect is improved, but water and oxygen can enter from the sides and affect the pixel circuit
Solution Approach 1:
The encapsulation structure is divided into two parts: an inorganic encapsulation layer covering the pixel circuit and array layer, and an organic encapsulation layer covering the driver circuit and groove. This segmentation allows each material to protect its designated area, with the inorganic layer providing barrier protection and the organic layer providing structural coverage and sealing at the groove.
Solution Approach 2:
The groove acts as an intermediary structure that physically blocks water and oxygen from reaching the driver circuit. By positioning the groove between the driver circuit and the panel edge, it serves as a first line of defense, reducing the burden on the encapsulation layers and providing an additional protective barrier.
2Reliability
If the inorganic encapsulation layer is extended to cover the sides of the display panel, then protection against water and oxygen is improved, but the manufacturing complexity increases
Solution Approach 1:
Different encapsulation materials are applied to different regions based on their specific protection needs. The inorganic encapsulation layer is applied to areas requiring high barrier performance (pixel circuit and array layer), while the organic encapsulation layer is applied to areas requiring structural coverage and sealing (driver circuit and groove). This local differentiation optimizes both protection effectiveness and manufacturing feasibility.
Solution Approach 2:
The encapsulation system uses a composite structure combining inorganic and organic materials. The inorganic encapsulation layer provides excellent moisture and oxygen barrier properties, while the organic encapsulation layer provides structural integrity and sealing capabilities. This composite approach leverages the strengths of both material types to achieve comprehensive protection without requiring the inorganic layer to extend to the panel edges.
3Reliability
If the groove is positioned closer to the edge of the display panel, then the distance for water and oxygen ingress is reduced, but the driver circuit layout becomes more constrained
Solution Approach 1:
The protection strategy transitions from a two-dimensional planar encapsulation to a three-dimensional structure by introducing the groove as a vertical barrier. The groove extends downward into the substrate, creating a physical wall that blocks water and oxygen ingress paths. This dimensional change allows the groove to be positioned closer to the edge without compromising driver circuit layout, as the groove's protective function is achieved through its depth rather than its horizontal distance from the circuit.
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a display region, a substrate, an array layer, a light-emitting element, and an inorganic encapsulation layer. The light-emitting element is located on the side of the array layer facing away from the substrate. The array layer includes a groove and a driver circuit. The driver circuit is at least partially located in the display region. The inorganic encapsulation layer is located on the side of the light-emitting element facing away from the substrate and at least partially covers the groove. In a first direction, the minimum distance from the groove to an edge of the display panel is less than the minimum distance from the driver circuit to the edge of the display panel. The first direction is a direction in which the display region points to the edge of the display panel.