Stretchable OLED Panel with CPM Cathode Encapsulation
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Solution Overview
Problem
Existing display technologies face challenges in achieving reliable pixel-level encapsulation and maintaining high transmittance rates while accommodating flexibility and stretchability, particularly in OLED displays.
Innovation Solution
The implementation of a display panel structure that includes a flexible substrate with a pixel definition layer, cathode layers, and encapsulation layers, where a CPM layer is used to pattern cathode layers without overlapping with them, and the use of transparent CPM layers and grooves to optimize region allocation and reduce relative sliding, ensuring proper encapsulation and high transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a CPM layer is used to pattern cathode layers, then manufacturing precision is improved, but device complexity increases due to additional layers and processes
Solution Approach 1:
The CPM layer serves as an intermediary pattern transfer layer between the pixel definition layer and the cathode layer. It receives pattern information from the pixel definition layer and transfers it to form the cathode layer pattern, enabling precise cathode patterning without directly complexifying the overall device structure.
Solution Approach 2:
The device structure is segmented into distinct functional layers: pixel definition layer, CPM layer, and cathode layer. Each layer performs a specific function, with the CPM layer specifically responsible for pattern transfer, allowing independent optimization of each layer's design and manufacturing.
2Illumination intensity
If transparent CPM layers are used, then transmittance rate is improved, but reliability of encapsulation may worsen due to potential sliding between layers
Solution Approach 1:
The solution moves to another dimension by introducing grooves in the pixel definition layer that extend vertically. The CPM layer is positioned to bridge between these grooves, creating a stepped structure that provides mechanical interlocking and prevents relative sliding while maintaining transparency.
Solution Approach 2:
The grooves act as an intermediary structural feature between the pixel definition layer and the CPM layer. They provide a mechanical connection that prevents sliding without requiring opaque materials, thus maintaining both reliability and transmittance.
3Manufacturing precision
If pixel definition layer thickness is increased, then manufacturing precision is improved, but transmittance rate worsens
Solution Approach 1:
The pixel definition layer is segmented into multiple thinner sub-layers. Each sub-layer can be precisely controlled in thickness, allowing the cumulative thickness to provide necessary mechanical support and pattern definition precision while individual thin layers minimize light absorption and maintain high transmittance.
Data Source
AI summary
Provided is display panel. The display panel includes a flexible substrate, a first pixel definition layer, a plurality of first pixel structures, a plurality of first cathode layers, and a plurality of first pixel encapsulation layers; wherein the first pixel definition layer is attached to the flexible substrate and a plurality of first pixel openings are defined in the first pixel definition layer; the first pixel structures are respectively is disposed in the first pixel opening and attached to the flexible substrate; each of the plurality of first cathode layers is disposed in each of the plurality of first pixel openings and attached to each of the plurality of first pixel structures; and each of the plurality of first pixel encapsulation layers is disposed outside each of the plurality of first cathode layers at each of the plurality of first pixel openings and seals the first pixel opening.