OLED Display Panel Embedded Encapsulation for Impact Resistance
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Solution Overview
Problem
Conventional OLED display devices suffer from poor impact resistance due to easy peeling between film layers, leading to issues like dark spots, bright spots, and colored spots when hit by a heavy object, which affects their service life and stability.
Innovation Solution
A display panel structure is developed with an interlayer insulating layer, planarization layer, and pixel defining layer, where a thin film encapsulation structure with a first embedded portion is used to enhance adhesion between layers, specifically embedding the cathode and encapsulation materials within the pixel defining and planarization layers to contact the inorganic interlayer insulating layer, improving bonding forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional OLED display device structure is used, then manufacturing is simple, but adhesion between film layers is poor causing easy peeling under impact
Solution Approach 1:
The patent implements an embedded portion structure where the cathode and thin film encapsulation structure are embedded into the pixel defining layer and planarization layer, forming a nested multi-layer configuration. This nesting approach creates mechanical interlocking between layers, significantly enhancing adhesion strength and preventing peeling under impact while maintaining a compact overall structure.
Solution Approach 2:
The patent employs composite material structure by combining the cathode (metal material) with the thin film encapsulation structure (inorganic material) and embedding them into the pixel defining layer and planarization layer. This composite approach leverages the complementary properties of different materials to achieve both strong adhesion and structural integrity, resolving the contradiction between simplicity and adhesion strength.
2Reliability
If conventional OLED display device structure is used, then device complexity is low, but impact resistance is poor leading to display defects
Solution Approach 1:
The embedded portion structure creates a nested configuration where inner layers are embedded within outer layers, forming a mechanically interlocked system. This nested design distributes impact forces across multiple layers and interfaces, preventing the peeling and display defects (dark spots, bright spots, colored spots) that occur in conventional structures under impact.
Solution Approach 2:
The patent transitions from a conventional planar layer structure to a three-dimensional embedded structure by embedding the cathode and encapsulation layers into the pixel defining and planarization layers. This dimensional change creates mechanical interlocking in the vertical dimension, significantly improving impact resistance and reliability while managing the increased structural complexity.
3Duration of action of stationary object
If conventional OLED display device structure is used, then manufacturing process is simple, but service life is reduced due to poor adhesion
Solution Approach 1:
The embedded portion structure creates a nested multi-layer configuration that provides mechanical interlocking and enhanced adhesion between layers. This structural design prevents peeling and maintains display integrity over time, significantly extending service life despite the increased manufacturing process complexity involved in forming the embedded structures.
Solution Approach 2:
The patent uses composite material construction with the cathode, thin film encapsulation structure, pixel defining layer, and planarization layer forming a multi-material composite system. This composite approach enhances interlayer adhesion and structural stability, improving service life while requiring more sophisticated manufacturing processes to assemble the multiple material layers.
Data Source
AI summary
The present disclosure relates to a display panel, a manufacturing method thereof, and a display terminal. The display panel includes an interlayer insulating layer, a planarization layer, and a pixel defining layer stacked in sequence. The display panel further includes a sub-pixel, a cathode, and a thin film encapsulation structure. The pixel defining layer is provided with an opening. The sub-pixel is disposed in the opening of the pixel defining layer, and the cathode is disposed on the pixel defining layer and covers the sub-pixel. The thin film encapsulation structure is disposed on the cathode, and the thin film encapsulation structure or the cathode is provided with a first embedded portion. The first embedded portion is embedded in the pixel defining layer and the planarization layer, and is in contact with the interlayer insulating layer.